FULL FEATURE - Bosch P7100 Rebuild for MINT 5.9L 1995 Dodge Ram x

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  • Опубліковано 18 лис 2022
  • Area Diesel Service Inc has partnered up again with @watchweswork for a rebuild for a rare beast - a mint condition 1995 Dodge 2500 4WD with the famous 5.9L Cummins 12-valve engine. This unicorn has been well-maintained and after Wes was able to do some repairs in his shop, an intermittent issue arose that pointed to an issue with the P7100 Bosch inline pump.
    That is where ADS stepped in with our team of diesel experts, and 40-year inline pump expert, Gary Dahler, to investigate the issue and remanufacture the P7100 Bosch pump to better-than-ever status!
    ADS experts guide us through the highly-detailed process, a process from start to finish normally takes up to twelve hours + to complete!
    Follow along through this full-length meticulous process of assessment, disassembly, external clean up, blasting, internal parts cleanup, diagnosis, parts replacement, reassembly, Bosch test stand test and calibration, final touches and good-as-new review!
    Watch Wes Visit our facility in 2021 - • Neglected Forklift Fin...
    Any and all costs/pricing mentioned in this video are general assumptions regarding this specific project or projects very close in time, labor, and parts cost for this present time. All our work is priced case-by-case, and we offer quotes to assist in getting our customers the best and most accurate cost for the job.
    We appreciate all the feedback and want to pass along that appreciation with a special offer for fans of this content. Do you have a pump or set of injectors in need of repair or rebuild and want to send it to our experts? Get in contact with us and mention our UA-cam channel / Watch Wes Work for some ADS swag and we will cover the shipping - please reach out to us for more details.
    To contact Area Diesel Service:
    Call: 1-800-637-2658
    Email: parts@areadiesel.com
    Online: www.areadieselservice.com and utilize our CHAT NOW feature!
    Socials:
    Facebook @areadieselservice ( / areadieselservice )
    Instagram @areadiesel ( / areadiesel )
    LinkedIn @Area-Diesel-Service-Inc ( / area-diesel-service-inc )
    Twitter @areadieselsvc ( / areadieselsvc )
    Watch Area Diesel Service here - / areadieselservice
    Watch Wes Work here - / watchweswork
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КОМЕНТАРІ • 232

  • @garydahler8291
    @garydahler8291 Рік тому +115

    Thanks everyone for their comments and inputs. I’d like to think every job I have done, is to this standard.

    • @ShainAndrews
      @ShainAndrews Рік тому +15

      Appreciate letting us look over your shoulder.

    • @rpsmith
      @rpsmith Рік тому +12

      It was awesome watching a true craftsman at work! Great job Gary!

    • @tda2806
      @tda2806 Рік тому +7

      Gary, you might feel that you have just "done your job", I would like to point out your skills, problem solving and methodical attention to detail are not "run of the mill" and you should be congratulated.

    • @richardellis3141
      @richardellis3141 Рік тому +4

      very nice work.

    • @bostedtap8399
      @bostedtap8399 Рік тому +2

      Many thanks for being allowed to watch you work Sir. I got lost after 5 minutes, deft Hammer skills, and sublime hand to eye coordination.
      Certainly not a job for any sort of gifted amateur.
      Stay safe 🙏

  • @dutchdb
    @dutchdb Рік тому +54

    Came for the Wes connection, stayed for the content.
    Thank you for the effort it takes to post this, I enjoy the work!

  • @johnfry9010
    @johnfry9010 Рік тому +36

    That pump is a complicated beast , thank God for guy's like Gary who understand how they work and can fix them like new !

  • @rayfoulkes5713
    @rayfoulkes5713 Рік тому +5

    I watched the deep dive. I love watching someone like Gary who totally masters their trade - whatever that trade is. It is often sadly missing from lots of organisations. It is for the same reason I watch Wes. He is really smart at diagnosing his problems but also knows his limitations and uses a specialist like Area Diesel when out of his range of skills. Thanks Gary for letting us look over your shoulder whilst you work.

  • @elborrachogrande
    @elborrachogrande Рік тому +6

    Gary is clutch. I love how he gets pissed that someone didn’t use factory parts.

  • @deweydecimal1446
    @deweydecimal1446 7 місяців тому +1

    That pump is insane. Wow, that's some serious engineering. It's far more complicated than the 12 valve it's typically mounted to.

  • @deercreekmechanical
    @deercreekmechanical Рік тому +16

    Found about you guys from Wes’s channel. Sent you the CAV pump and injector out of my 1958 Lister LD1 over the summer, beyond pleased with the results. Can’t thank you guys enough.

  • @edhoran1709
    @edhoran1709 Рік тому +11

    Preferred the "deep dive" version. Awesome job on that pump. Gary is one hell of a technician. He's a treasure for the company. Excellent video on what you folks are about.

  • @JT-tz5hp
    @JT-tz5hp Рік тому +2

    I was surprised at how much of that classic diesel sound is from the pump. Always thought all that clacking was purely engine related.

  • @HUBBABUBBADOOPYDOOP
    @HUBBABUBBADOOPYDOOP Рік тому +6

    Very much a pleasure to see a dedicated Craftsman at work.
    Especially nowadays- 40 years experience is hard to come by with anything.

  • @chrisgallant9889
    @chrisgallant9889 Рік тому +20

    Gary tells you how many years he has been working in this field. Just by looking at the work he does . Plus he explains a lot. You can literally see how many years he has without telling you. That is some awesome work you do. .

  • @josdaalmans6977
    @josdaalmans6977 Рік тому +2

    I like both formats, The short one for quick info, the long one for detailed info. Nice job, proffesional done.

  • @freedomfab319
    @freedomfab319 Рік тому +2

    Watch Wes sent me here! If he says you're good you must be!!! Lol

  • @HogshooterHotrods
    @HogshooterHotrods Рік тому +2

    Gary knows this work backwards and forwards, nice to see someone who has that "built better in America" attitude that was so common in years past! Great job thats for taking us along!!

  • @Jimmyfisher121
    @Jimmyfisher121 Рік тому +2

    Geek level every time I loved watching a professional at work.

  • @berniefudge4716
    @berniefudge4716 2 місяці тому +1

    My second comment is some people are good and some people are great and if you watch it all you'll know Gary impressed the hell out of me

  • @tmscheum
    @tmscheum Рік тому +2

    Came over from Wes’s channel. I don’t understand a lot of the technical talk but I do understand “shmoo”. Good stuff!

  • @jonkinney1067
    @jonkinney1067 Рік тому +5

    You sir are a malfunction finding,investigating and answer getting guru, and a genius. Great job finding and investigating the problem. And an amazing explanation of the entire process

  • @dandydenni1615
    @dandydenni1615 Рік тому +2

    It is awesome to watch a true professional technician do their work. Thank you for bringing us along. I appreciate it. And thanks for slowing down to explain. I am humbled by your knowledge and skill.
    Long version - yea! $2000 actually sounds fair for a typical high quality rebuild/overhaul. Yes, $3600 sounds high and is, but me too as a customer would be pleased with no regrets.
    I came here from Watch Wes Work.

  • @henryD9363
    @henryD9363 Рік тому +3

    Damnation! That is complicated machine. It's probably more complicated than the engine itself especially in terms of the number of different parts and their interactions.
    Almost unbelievable

  • @mdouglaswray
    @mdouglaswray Рік тому +3

    Shout out to Area Diesel! I came here from Wes' channel, great to see this collab!

  • @paulhammond7489
    @paulhammond7489 Рік тому +4

    Probably the longest video I have watched on UA-cam, and enjoyed every minute of it. Thanks guys.

  • @zrkn1
    @zrkn1 Рік тому +3

    American Quality Workmen = 100% QUALITY Guaranteed !!! Area Diesel Service must be so proud of its business practice and quality workmanship. Thanks to Wes for introducing A.D.S. to the entire country. Oh yeah, Gary you the man!!

    • @KStewart-th4sk
      @KStewart-th4sk 12 днів тому +1

      "Area Diesel Service" NOT "American Diesel".

  • @williamb2642
    @williamb2642 Рік тому +2

    Awesome technician..awesome video..tell everyone else in the shop to lay off the air tools when the master is at work!

  • @toma5153
    @toma5153 Рік тому +4

    Like the split video format. Wish more channels did that - top level overview and then the nitty gritty. Great work.

  • @robertasleson5856
    @robertasleson5856 Рік тому +2

    Great video. Learned a lot even though I am not diesel minded. Complicated piece of equipment. Gary knows his stuff. Great ending!!!

  • @michaelclutton8446
    @michaelclutton8446 Рік тому +3

    I have never watched a video of this length before on Utube, I found this long version fascinating, watching someone with Garys experience . I will certainly subscribe Mike UK

  • @michaeltrinkle4197
    @michaeltrinkle4197 Рік тому +2

    Stumbled on 2days ago an watched cc equip.rotary rebuild.easy to understand nothing but good i've heard over the years.detail understanding and listening to complaints and a clean environment.top mechanics who understand this complicated work.if only the younger generation and some do take jobs seriously.awsome video.Thanks

  • @8osWeReTheBest
    @8osWeReTheBest Рік тому +16

    These guys are the best!! They fixed my asv injection pump, and helped me with many questions. I will have these guys do ALL my diesel work! Thanks

  • @elmustachio3683
    @elmustachio3683 Рік тому +7

    That pump is ready for a million miles. Awesome work!

  • @American_Creed
    @American_Creed Рік тому +1

    Craftsman,craftsmanship and hard work is what makes America the greatest country.

  • @Andrewausfa
    @Andrewausfa Рік тому +2

    Amazing care taken. The pump looks like one of those WWI Mercedes in-line aero engines from the front.

  • @kevinwalker4623
    @kevinwalker4623 Рік тому +2

    Gary is a BEAST and a legend! Red shirt dude, excellent use of schmoo, AVE would be proud!

  • @LAKESIDEBOB1
    @LAKESIDEBOB1 Рік тому +2

    Long version was very educational, thank you

  • @cesargallo7424
    @cesargallo7424 Рік тому +2

    These pumps are work of art themselves. The amount of pieces and devices to control fuel delivery is amazing! Gary makes it look so easy until we lift the hood and face the reality

  • @davidprattdo
    @davidprattdo Рік тому +1

    Excellent work, when I get an older Cummins to restore, I’ll be sending the pump to you for a rebuild. Thank you.

  • @lesmansom7817
    @lesmansom7817 Рік тому +2

    Excellent.
    Much better than the Cummins tutorial when I did my apprenticeship 😎👍🍺

  • @davidmiller9485
    @davidmiller9485 Рік тому +2

    I just went back and checked, turns out i was right. That truck had a banks system on it. That isn't a fly by night company. The products they make are high end and very much on point. I've seen a banks power pack put over 100hp on diesel. He's quite picky about dyno tests (ie. They MUST follow SAE regs. or it isn't a valid test) and he's gotten some serious power out of his shop. So whoever worked on that pump was using high end parts, not that means that the installers (unless it was banks themselves) was any good. Just that those banks parts were tested to an inch of their lives and are very much high quality.
    Edit: i just realized that i never said who "he" is, that would be Gale Banks and it was just a cold air induction system that gave the 100 hp increase (actually it was 109 or so)

  • @tomhurley3938
    @tomhurley3938 Рік тому +4

    What talent and skill! Almost makes me want to break something just to watch you fix it.

  • @kevinmartin9432
    @kevinmartin9432 Рік тому +3

    When I was an apprentice in the 70, part of my training was in the pump room, where we used to refurbish mainly CAV jerk pumps, I really enjoyed it, with a strip down area, and a separate clean room for assembly, then the calibration rig, Gary reminds me of the craftsmen that used to work there.

  • @berniefudge4716
    @berniefudge4716 2 місяці тому +1

    Gary is amazing, totally amazing.

  • @1lilfarm
    @1lilfarm Рік тому +4

    I like both versions. I watched the shorter version first and then this version to see some of the in depth stuff. Thanks!!! 👍👍👍

  • @djosbun
    @djosbun Рік тому +5

    I’m not a diesel mechanic but if I am ever in need, you can guarantee that I’ll be doing business with your excellent team of professionals. Cheers from Cincinnati, Ohio.

  • @yomamaxx
    @yomamaxx Рік тому +1

    Dude's a magician...incredibly skilled

  • @bostedtap8399
    @bostedtap8399 Рік тому +2

    Pretty sure many petrol/gasoline engine guys are in amazement at what is involved in those old "Oil Burners", partly the reason these engines cost more.
    Excellent insight into the heart of a Rudolph Diesel engine.
    Love that bench swivel manipulater, par excellence all.
    Thanks for sharing, and many thanks to all .
    Best regards from the UK.
    John.

  • @zerajera
    @zerajera Рік тому +3

    Fantastic experience, dedication & skill. Really enjoyed watching Gary performing his craft on this pump. Thanks for sharing.

  • @NathanVogt
    @NathanVogt Рік тому +3

    Your expertise is beyond reproach. Great work.

  • @clarencewiles963
    @clarencewiles963 Рік тому +2

    That’s what it’s all about doing it correctly, and experience. Thanks.

  • @curtisk84
    @curtisk84 11 місяців тому +1

    Very detailed and informative video. Thank you for taking the time to put this on here. Its very interesting to note the noise the pump makes during operation. The distinctive sound that the cummins engine makes when standing next to the engine I now realize is mostly attributed to the pump itself.

  • @wacholder5690
    @wacholder5690 9 місяців тому +1

    Who makes an over 2.5 hours video about an injection pump repair ? Other than you guys. And it was worth watching it all to the end. Thanks for sharing !
    BTW: apparently these pumps base on those used on the fuel injection pumps used on the Daimler Benz 12 cylinder airplane engines used in WW2.

  • @samcooke2742
    @samcooke2742 Рік тому +1

    Gary for President

  • @milantrcka121
    @milantrcka121 Рік тому +5

    Bloody fascinating. Thanks for the autopsy and revival!

  • @patrickcolahan7499
    @patrickcolahan7499 Рік тому +4

    Excellent work Gary, your a true craftsman that pays close attention to the fine details. Something critical in diagnosing and identifying the source of the problem in this situation. A real asset to ADS. Thanks very much for sharing.

  • @brendanhayes2752
    @brendanhayes2752 10 місяців тому +1

    Love the long version.

  • @rhyde71800
    @rhyde71800 Рік тому +3

    Gary you are a artist. came over from Wes’s channel Great video thanks guys.

  • @edtoebes
    @edtoebes Рік тому +3

    I bought my 24 valve pump rebuild from you. I also have a 12 valve with a P pump. If it has any issues when I get it restored, will be sending to you. Would have not known about you without Wes videos.

  • @casycasy5199
    @casycasy5199 Рік тому +2

    i will never use what i just watched for all most 3 hrs. but it was first rate .he explained every thing about the pump .i just couldn't stop watching.great video

  • @huckelberryauditor5583
    @huckelberryauditor5583 Рік тому +2

    Watch Wes Work sent me to watch this educational video.
    Thank you for maiking a long video for us special needs "want to be someday" mechanics

  • @edwardkamenar1493
    @edwardkamenar1493 Рік тому +3

    Dude is amazingly good at those rebuilds. WOW, I'm amazed.

  • @jltcasper3
    @jltcasper3 Рік тому +2

    Garys a master of his craft great job would def send u guys my pump if needed

  • @carltauber2939
    @carltauber2939 Рік тому +2

    Thank you for taking the time and effort to make this very interesting and informative video. It's a superb demonstration of the work of your company and its dedicated employees.

  • @tullydog9047
    @tullydog9047 Рік тому +2

    Really enjoyed the video. Thanks for taking time to document and present it!

  • @Jameson4327
    @Jameson4327 Рік тому +2

    One outstanding build

  • @malware_in_tn9008
    @malware_in_tn9008 Рік тому +2

    I’m not even a diesel guy and I enjoyed the longer version. Always interesting to get a behind the scenes with a rebuild expert. Makes me think twice before digging into a precision machine I know nothing about.
    Nice ending btw.

  • @tallyman15
    @tallyman15 10 місяців тому +1

    Great rebuild. A lot of labor for this. A master at work.

  • @Onerouss
    @Onerouss Рік тому +7

    That is crazy, I'm shocked those o-rings can hold back enough pressure from the expanding grease to cause the barrel to compress!

  • @wallss999999
    @wallss999999 Рік тому +3

    Gary is a awesome teacher. Very hard to find or keep someone like him. God bless

  • @staind288
    @staind288 Рік тому +3

    Very interesting and informative! Thank you for sharing this process with us

  • @alwayshungry24
    @alwayshungry24 Рік тому +1

    love watching masters at work.came here from www,s channel. sat glued for the entire 3 hours so now i gotta go to bathroom lol.great vid

  • @simonilett998
    @simonilett998 Рік тому +2

    I'm guessing I just enjoyed the last 2.6666789 hrs geeking out. It took me over a month to watch this after Wes's video, but glad I finally got the time.
    I laughed rather hard at your closing line, borrowed from Wes, who borrowed it from the classic reach-around master Mr. Eric O from @S.M.A🤣🤣👍

  • @nate4684
    @nate4684 8 місяців тому +1

    This is the best video I've ever seen on the p pump. The knowledge you guys have is amazing I'll definitely be using you guys in the near future for pump work and other stuff.

  • @lesmansom7817
    @lesmansom7817 Рік тому +2

    If I remember correctly,
    Cummins Australia wouldn’t let anyone fix a p pump let alone supply parts.
    Box them up and send them to the other side of the country and hope they didn’t schedule the rebuild for a Friday arvo or a Monday morning.
    It was the late seventies and it was Australia 😎👍

  • @sarah-kenorum2852
    @sarah-kenorum2852 Рік тому +2

    Nice to know that there are still Old school machine shops around that have the institutional knowledge to get it right. Why is there always time to do it again, hopefully there will not be a next time..

  • @douglasmayherjr.5733
    @douglasmayherjr.5733 Рік тому +2

    What an in depth video of the Bosch P7100 Rebuild. Your Technician Gary, knows that pump inside out, experience is hard to beat. Really appreciate the evaluation and cost of the repairs. When using OEM parts it is not cheap, but should last a lifetime. Thanks for the video. I am a fan of Wes’s Channel, excellent diagnosis and repairs.

  • @jason86768
    @jason86768 Рік тому +2

    Absolutely amazing video! I looked up your website and was tickled pink that you have a location in Indianapolis Indiana, just 1.5 hours away from me!
    If I ever need help with my 94 p-pump, I'll definitely hit you guys up!

  • @arthurfricchione8119
    @arthurfricchione8119 Рік тому +2

    New subscriber thanks to the recommendation of Watch Wes Work. You come highly recommended and I will enjoy watching your channel and videos starting with this one 🇺🇸👍

  • @scoutman9452
    @scoutman9452 Рік тому +2

    Really enjoyed watching an expert guide us through such an intricate rebuild process. Hats off to both of you!

  • @milwaukeeroadjim9253
    @milwaukeeroadjim9253 Рік тому +4

    I came over from WWW to see what you guys do. I'm very impressed with your very clean shop and Gary's assembly and troubleshooting skills. I worked in manufacturing as an Industrial Engineer estimating and setting production costs on hydraulic product assembly and testing. Very impressed on quality of Bosch product for quality and ease of assembly.

    • @garydahler8291
      @garydahler8291 Рік тому +2

      Thanks Milwaukee. As much as I preach Bosch, we do use “after market” plungers in our Caps Kit replacement pumps. Outstanding. I’m sure they had someone like you involved. 😊

  • @ronzimmerman8968
    @ronzimmerman8968 Рік тому +2

    Great content! A lot of good information for us diesel owners. It was a pleasure watching Gary work.

  • @CHIBA280CRV
    @CHIBA280CRV Рік тому +2

    What a beautiful craft , thanks for sharing 👍🏼👍🏼👍🏼👍🏼👍🏼

  • @robertwitkowski1650
    @robertwitkowski1650 Рік тому +2

    WWW suggested Viewers watch this channel. Wow! I'm not a diesel guy, had no idea how large and complex a pump was. Reminded a a little Kubota diesel. Great video. Thanks for the content.

  • @BrorAppelsin
    @BrorAppelsin Рік тому +2

    I enjoyed the video where Wes was visiting your location, liked and subscribed now!

  • @jpop2499
    @jpop2499 Рік тому +5

    Another great video you guys have put together. I much prefer the long and extremely detailed version of any technical video. I don't care how many hours it might be, I will watch every detail with great interest. May I suggest a microphone for Gary to wear. I want to hear everything he has to say. Also multiple camera angles so we can see all the fine details. Suggestions for future videos would be checking and setting the governor foot engagement and governor teardown and rebuild for one of these P7100 governors, along with more details while setting the fuel rates on the calibration machine. Thanks so much for putting this together for us to watch and learn.

    • @garydahler8291
      @garydahler8291 Рік тому +4

      We have a similar video, on a P 3000 series Bosch. With the same governor. 4 part series. It was for a 8.3 forklift 🧐

  • @bosse1033
    @bosse1033 Рік тому +1

    Wez sent me. Thanks for a great video.

  • @timkjos1495
    @timkjos1495 Рік тому +2

    I watched the long version of this video. It was very informative. These diesel pumps are very complex. Any and all repairs should be undertaken by an experienced, knowledgeable mechanic. After viewing this I concur that it is money well spent to have the pump thoroughly inspected, and replace any suspect parts. You have a professional shop!

  • @zackcampbell3604
    @zackcampbell3604 Рік тому +1

    Wes sent me. Beautiful video

  • @MiamiZombie2012
    @MiamiZombie2012 Рік тому +3

    Those pumps look cool, like a mini in line 6.

  • @jdsparky288
    @jdsparky288 Рік тому +3

    Wow! Very detailed and put together very well! My only regret is the audio around the calibration stand wasn’t good. That was one of the most interesting parts to me, to see how the timing and fuel delivery was adjusted, but missed out on some of the explanation. Maybe a different audio/mic set up would help ??? Between C&C, Dirt Perfect, and now WES, I finally made it to your channel. I subscribed and look forward to future content! Growing up on my grandfathers farm I learned to work on equipment and trucks, and developed a fascination for mechanics. I still do all my own wrenching but I wouldn’t tear into a diesel pump for nuthin but trouble and a headache. It takes a skilled experienced expert to do “some” jobs and my hat’s off to Gary! I work daily with 480 volt electricity and trust me, you better know wtf your doing! Experienced skill is everything!

    • @garydahler8291
      @garydahler8291 Рік тому +1

      Thanks for your comments Sparky. I’ll do diesel, you do electricity

  • @tsitom3461
    @tsitom3461 Рік тому +1

    Great job Gary!
    I prefer the full episode. If I ever need diesel parts or pump rebuild service I will call ADS.

  • @stephenvale2624
    @stephenvale2624 Рік тому +2

    Amazing how many complex operations go into the building and calibration of something that on the surface sounds simple...like a fuel pump.

    • @KStewart-th4sk
      @KStewart-th4sk 12 днів тому

      "Fuel Pump", "Injection Pump" two completely different things.

  • @1112223333111
    @1112223333111 Рік тому +2

    I rebuilt 7.3 injectors myself...thats the end of the road I see. This was insane

  • @redlinearroyo847
    @redlinearroyo847 Рік тому +2

    Definetly subscribing after coming here from Wes. Great work.

  • @theprofessorfate6184
    @theprofessorfate6184 9 місяців тому

    Great video. Kids, when you find yourself the outcast at school, can't get along with anyone else and think you're smarter than everyone else, you can look forward to rebuilding injections pumps.

  • @JC-gw3yo
    @JC-gw3yo 6 місяців тому

    there can't be more than a handful of these dedicated super technicians in America. I imagine that is why new diesels have gone to electronic fuel injection. To get this kind of talent is rare today

  • @sirmister4411
    @sirmister4411 Рік тому +1

    I commend you Gary great job I don’t have the patience to make a film like that it would throw off my system of rebuild. I have a system and order for tear down clean troubleshot and assembly and I hate to have to explain what I’m doing You did a great job and commentary

  • @pdee886
    @pdee886 Рік тому +3

    Your company does excellent work! Love how throughly you guys do things and take care of the customer. This is the way it should be. Cummins P-Pump version is most definitely 'the one to have' if you're into good reliable performance that you can turn up easily and don't have all the emissions/ electronics B.S. Thank you very much for sharing this, I enjoyed it!👍👍🙂

  • @rpsmith
    @rpsmith Рік тому +2

    Excellent Job! I know where to get my pump repaired now!

  • @jamesrandalls6914
    @jamesrandalls6914 Рік тому +1

    i like the long version, thanks

    • @garydahler8291
      @garydahler8291 Рік тому

      I think I was on meds on the first version.

  • @alanlashley943
    @alanlashley943 Рік тому +2

    Very very good video! No back-patting, look what I did type stuff. Take pride in your work, nice job!

  • @michaelshingleton1628
    @michaelshingleton1628 Рік тому +2

    Thanks when I worked at wv in the late 70's early 80's and rebuilt these pumps if the plunger was 1 and 1/2 degree hotter than the barrel the plunger would not fit in the barrel. So I can believe a little grease and oil could compress or more likely the barrel temperature would become cooler than the plunger due to the thermal conductive path formed by the grease.