Injector Swap Cummins Big Cam
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- Опубліковано 14 жов 2024
- I had a heavy white/blue smoke coming from my truck exhaust. There was a small miss on the engine. Decided to replace all injectors on my Cummins big cam 3. Here I will show you the process of replacing injectors on these old engines.
Thanks bud for all the effort you put into making this vid. Very interesting and informative. It'll help me a lot in the near future.
Your welcome
Great video. Well done! Thank you for taking the time to record this when you had to be at work at 6:30am!
Thanks for the great video I will be doing mine this weekend
Very well presented video also very through. The best video I have seen on Cummins injector replacement.
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Excellent video. Thank you .
I have a 9670 just like that. Great dependable truck
Yes they are
Hey man can you please make a video showing the stud length and where they go
Figured out the "0" ring issue. It was a super hard black plastic. Probably a super old hardened "0" ring. Steve
Your video is the best one I've found so far. I got a versatile tractor with a 855 Cummins getting diesel in coolent I think I know which head it is can you see if injection cup is cracked by looking at it or will I have to take it to machine shop
You might be able to check it. But can be a bit hard to make sure if one is cracked. Also, check your injector o rings. If no luck, you'll have to take all apart.
thanks Iam thinking Iam going to have to pull head anyway it's the rear head starting slobbering out of exhaust a little bit on that cyl can you just pull one head.. I got 3 Versailles with 855s one with a 903 non turbo and a 81 700r mack with an 855 been best engines for me I've always changed oils before there due and antifreeze should last for a very long time
Can bad injecter o rings could put fuel in water
@@MP-io7yj yes. You can pull just that head
Thank you very much
Thanks for the great video. I have a question on how much did you torque the 6 long bolts that hold down the rocker arms and Jake Breaks. Thank you
Studs are torqued to 65 - 75 lb ft, jakes at 55 - 60lb ft
@@lifeintrucking.eduardomorales okay thank you very much, I just now joined a 855 cummins group to ask this question. You where very quick LOL.
Here to help out!
My 400 is probably about to get injectors 😢 I can hear a puff sound from the exhaust and has very little ass on top end now. Like it’s choking down once a load gets put on the engine. How are the rebuilt injectors?
Rebuilt injectors have worked great for me
Well let me clarify that. Bought a set from cummins and they did not perform good. Had a miss etc. Purchased a set from premco from TX, and those worked really good
@@lifeintrucking.eduardomorales 10-4 I appreciate you man. I’m having issues finding what part numbers I need because my CPL is an odd number and can’t locate it on the matrix sheet. Guess I can just pull an injector and see what numbers are on it. And gaskets are getting hard to find
You can get all gaskets at agkits.com. I've had good luck getting parts directly from cummins or ag kits
@@lifeintrucking.eduardomorales same, you wouldn’t believe it right now but zero upper gasket sets for the big cam from all the above 🙈
Those tails on the hose clamps though Jesus
Hey Brother, thanks for the video! Any advice for a new owner of an 88 International Cab over with an NTC 350 BC Cummins with 700k on her? New injection pump,air compressor. Runs really strong and sounds minty 😎. Thanks again, just subbed
Do your oil changes when needed. Watch your antifreeze. If to old, might be time to change it. One of the things many don't check would be your water belt tensioner pulley. Check if there is a grease fitting. If not, there should be a plug. Take it off and replace with a fitting. Keep it greased. Pay attention on symptoms for bad injectors or camshaft. If your truck is running strong, then you should not have that problem. You have a good engine, just always pay attention when it speeks to you!
@@lifeintrucking.eduardomorales you the first to ever respond to me on here about that! Thanks for the advice! I will do everything you mentioned and definitely put a fitting on for a grease point! Driving her an hour back to my house next Friday after I figure out everything I need to just get it home. Got one agricultural inspection I will be driving through 😒. Thanks again brother!
When you drive her back, pay attention if she smokes. If she does, she might need injectors adjusted. Listen for injector knocks as well. Was this truck driven regularly before you bought it?
@@lifeintrucking.eduardomorales the truck was owned by a farmer who bought it from the original owner, he just used it to move trailers around and ever now and then some livestock. He replaced fuel lines, injection pump, air compressor, and did some maintenance on her along with front end work. But he said that the truck just doesn’t get used enough anymore. Like I said she sounds really good and runs really good. Got an hour drive next Friday to get her home but I don’t know what all I need besides insurance to get her home 🙈🙈🙈
You should be good. It sounds like a solid truck. Take care of her and she'll take care of you!
Loved your video. I Have a question if you could help. I have alot of fuel coming from my exshust manifold on my 85 Peterbilt 400 big cam. It smokes more white smoke then blue, and sometimes black in color under heavy load but clears up. Engine still runs strong. Fuel leakage appears to tame down once it's eng. Is working and warm up to 170. But starts again setting and idling. When I take off after idling, it smokes like a Freight train for a few miles before it clears up. Injectors? Haven't tried ATF in fuel filter. Any ideal?
Mix a few cans of seafoam in fuel. When that fuel is done, then add 2 bottles of atf in each tank of fuel. You might see a different color of smoke due to the atf. Hopefully that will get your injectors working right. If it doesn't, you might need to adjust your injectors, or time for some new ones. It sounds like one or more injectors might be staying open(leaking). You need to be careful with that. It can cause damage to engine.
Thanks for your feed back. I'll try that.
Dont idle a big cam very long if u have to idle if u have to idle set the idle at 1100 rpm
That causes excessive smoke when idleing for a while. I always try to idle as least as i can. It's a mechanical engine so the timing stays the same when idleing. Unlike the electronic engines.
Joe raimondo did you ever get that issue cleared up? My 400 bc4 does the same thing as described. I am going to change the injectors and do a compression test
Great Video How did you get the Push Tubes lined up without losing up the valve adjusting screws my Rocker Boxes are leaking so i have to do mine .
Just use a flat screw driver and you can line them up
Thanks
Line up the tubes before you tighten the rocker boxes. Once lined up, you can torque the box
Hey brother. Thanks for all the content. Quick question. Will a bad injector cause blow by?
It will not. Bad injectors will miss but not cause blow by.
Thanks. I am about to open mine up . I have loss of power and slightly missing on low rpms. Regarding blow by, I have the tube for blowby on the head closest to firewall. You think that will cause any difference?
It doesn't matter where the blow by tube is located. Loss of power and blow by would make me think of a rebuild.
@@lifeintrucking.eduardomorales hopefully it’s not. But it’s going to get opened up . Mechanic aiming towards a push rod or bad valve. It also has a ticking sound .
How many miles on engine?
Hey man quick question did you put the engine in too dead center before taking anything apart ?
Sorry man. Just saw your question. I did not for this process. However to run overhead you need to follow the sequence for adjustment. At that point you do need to know that the markings on the accessory drive is correct.
Hi sir.. Thanks you for this video, it helps me a lot. Im also a mechanic technician of cummins Generator sets. One thing I could ask to you sir is the cummins NTA855 Big cam is the same as the torque of the injector that is shown in this video it is 6 ft-lbs? ? Thank you
If you have top stop injectors, setting will be inner base circle method 6 in lbs, not ft lbs
@@lifeintrucking.eduardomorales thank you so much sir very informative... God bless 👍👍
0.7Nm or 6 in ibs.
Always put orryfish to the exhaust side, tappet galary no need to remove for injector changing.
I have a big cam 3 she smokes a lil, but runs strong & no misses..shop ran overhead & I asked about needing injeectors but they she i didnt need them...Whats ur recommendation?
Big cams will smoke. That's the nature of this engine. I wouldn't worry about it if she's running good.
Me gustó el otro método de torque del inyector que usaste con el torquimetro lbs/pulgadas👍
Awsome video it help me alot I have a big cam 4 9670 international 1988
Nice! Good to hear it helped you out.
Can I remove the jakes then just unbolt the rocker box’s or do I need to do the sequence just like setting but get the eng to that certain lobe so you can back each rocker arm off . Or just unbolt it
If your going to adjust, jakes comes off and make your adjustments. Make it as the email i sent you.
Not sure what u mean exactly. You don't need to remove the rocker boxes to run the overhead. Nonetheless, i always put the engine on one of the 3 adjustment marks before I do anything else. That way I have a definite starting point.
If you are going to remove the rocker boxes, then there is no need to loosen the valves first.
Hey brother, is it possible that a bad injector/ Oring will cause engine to over accelerate like crazy on its own at idle. ?
That sounds like your fuel pump. Usually when an injector is bad and over fueling it will knock and smoke.
@@lifeintrucking.eduardomorales ok good . I was about to open the cab of worms. I was also told it was the fuel pump. Do you know of any way to bypass a failure like that just to drop a load without engine blowing up
There is not much you can do. The fuel pump regulates the fuel pressure to injectors. You will have to get it rebuilt. Are you burning any oil?
@@lifeintrucking.eduardomorales no not burning oil. I am about to try and connect a hose directly to pump to eliminate the suction line sucking air.
@@lifeintrucking.eduardomorales the reason I’m thinking it might be air in the line is cause I swapped an old pump and it accelerated the exact same way. Exhaust ports are dry so no leaking injectors. No oil in turbo ( both sides). Only pump and hopefully line sucking air/ filter bracket .. something between tank and pump.
Awesome job. I love them ole 350 big cams. How's the fuel mileage now compared to before?
I haven't checked the fuel mileage on it yet
What about now ? 😂😂😂
6 to 6.5. Depending.
Thank you
Is this process the same for the big cam 400
Yes
Question when setting the valves do you how tight to you set it on the feeler gauge enough to glide it through or until it’s bitting down a little on the feeler gauge?
It has a to be moving freely. Not to tight. Just be able to feel a little drag on feeler guage.
Thanks I’ll go back and adjust i did my overhead and i loosened it right before i felt drag and truck didn’t want to start. Also gonna rerun overhead i feel the torque wrench i used was garbage i have the one you used but didn’t use it . I’ll adjust valves to the point where i feel a little bite. Do you know why the overhead affects the way the truck starts!? I had a guy do it and when he did it truck started very easy even in freezing cold. I’m doing obc do you know if there’s any truth to doing injectors at 60 for better power but will smoke more and 72 is for less smoke
@@rcuev118 .011 and .023 are used when using inner base circle to set the injectors, .014 and .027 are used when using outer base circle to set injectors. Inner base uses a dial indicator or preset torque (6 inch pds) to set the injectors and outer base uses a torque wrench. You have to check what kind of injectors you have. Talk to cummins and ask whats the torquing specs to your injectors if not sure. If you have top stop, inner base method is 6 in lbs. Thats what i like to use. I guess its your preference.
Eduardo Morales do you think there’s any difference between inner and outer base? I had them set at .013mm and .23mm just bc i didn’t have a .011 feeler one but on the fb group everyone said it was 72 inch pounds for the injectors their top stop as well. My issue was i took it to a guy when i took it truck was loosing prime on uphills and never did before also was slobbering on side of manifold when i got it back truck was even more powerless when loaded it would slouch to 55 but did stop slobbering but quickly returned on a different injector . When i opened it myself i did see he did ibc and i tested the injectors with the bar and sound good i think I’m going to redo the valves tightening until i feel a little bit down on the feeler stick. And recheck the injectors with the same auto parts product you have it goes up to 80 inch pounds.
@@rcuev118 you might have faulty injectors. You can redo the overhead and see how that goes. On top stop i like doing ibc. Let us know on how that obc goes for you..
I haven’t ever tore one of these apart . Wish I had a manual can’t find one for the eng I have
If you have quick serve, i can try and send you a link. If you do, send me youre email.
Eduardo Morales I do have it rktlj2cool@yahoo.com
Is that cap on top of the valve cover for adding oil?
Thats the breather
My 84' ntc I just got only has the small inlet for the dipstick on the turbo side near the 2 oil filters. Wanting to add a gallon of oil to her
If it doesnt have one on the side should have one on top
is the cabby for sale
It could be
Appreciate the video my dude..
When installing the injectors do they have to face a certain way?:
No. Just make sure you hear the snap when installing them
@@lifeintrucking.eduardomorales thanks buddy
@@barrettbuilt your welcome
Deasel supply from exhaust side in the head, so its wiseble to put orryfish at exhaust silencer side.
It would help if you use nitrile gloves it's known in the machanics industry that oil can cause serious problems with the human body it deteriates the joints and other problems so use them
I do use them, but not all the time. Almost all mechanics I know don't. My dad was a gas mechanic for many years, and he never used them and is totally doing good with no issues. Not sure where that came up since it's actually the first time I hear about it, but I will totally look into it.
How many injectors does it have?
6
I Have heavy smoke coming from my exhaust you can tell it’s fuel . Fuel is coming out of the exhaust manifold not just pouring out but it is do you think it’s just the injectors . My engine is a 400 big cam 2
It sounds like injectors. Have you done an overhead? Are you idling for long periods?
Eduardo Morales I just bought this truck last Wednesday but it’s not just smoking because it’s cold it’s heavier than that .
Eduardo Morales I haven’t done a over head I put a new thermostat in it today just to make sure it want stuck open and running cold . I have never done a over head on any truck but I would consider it if I could get all the info so I don’t mess it up .
@@r2cool39 email me and ill respond with the info to run an overhead. Hebervalleytransportllc@yahoo.com
Sir I have a ntc 350 Cummins on I see diesel in the radiator
Sounds like a head problem. Possibly cracked head? Best off replacing the head if you know wich one is leaking. You will have to check each one. Any leaks on the outside coming from the heads?
@@lifeintrucking.eduardomorales all 3 heads are off who must i check them
Check for any cracks. Check injector cups. Make sure they are good. If you cant see any cracks you will probably have to take it to the machine shop to have them checked out. If you were thinking of replacing them with new ones, then avoid having them checked out. That would be a waist of money.
How do u remove the injector cups
Take it in and get reman or just get new ones. You can check the cup and see it cracked.
Ponle desengrasante y lava a precio. El motor así puedas ver de donde vienen las fugas.
Ya esta arreglado. Fue los cam followers.
mate, why didn't you pressure clean the engine before you started your repairs, you stay cleaner your (wife won't get so cranky when she washers your dirty cloths) and you will stop crap getting in the engine when you open it up. ( cummins mechanic australia.)
I would of, but my pressure washer was not available at the time.
I was thinking of taking the valve cover off to see which injector is bad
You can do that. Just have youre engine on, and hold down an injector at a time. The one that doesn't make a difference on your engine, will be the bad one
No need to take the lids off, just feel the manifold, the cold cylinder is the one not firing.
Not sure about feeling? Checking with a temp gun would be ideal. No matter what, your still going to have to take the covers off and might as well run a second check.
take the silicone away from who ever has been using so much !
Next time around save yourself the hassle of syphoning.
By re-priming your PT pump and filling the fuel filter with a mix of 80% automatic transmission fluid
To 20% diesel...
And pour a gallon of sea foam into your tanks.... syphoning and washing the cylinders is still the best method
But usually the detergents and natural lubricants in atf and diesel will loosen up the carbon in the cylinders and when the engine is at operating speed
1500 rpm or so. It’ll just blow that shit out the stack for a little while. And then it’ll run clean
The sea foam is just a post rinsing kinda and stabilizer for the fuel.
I Did that twice before changing injectors. And still it came out very dirty.
Eduardo Morales damn. It was that bad....
I’ve got a truck at work that smokes getting worse..... I know it needs injectors but no one is gunna wanna buy a full set of injectors for a truck we don’t “need”
so I just keep adding ATF and stabilizer trying to clean it up a little....
also have an
NHC-250 small cam I’m about to replace the PT pump and other things on.... it’ll either run decent. Or overspeed again and break something like a connecting rod or any one of a few hundred pieces in a truck I just bought .......
@@INTERNATIONAL_RDF-D talk to warren at Premco diesel performance. They have rebuilt injectors at a good price.
Question i have a bc3 i just bought this truck in July I’ve been a driver for 5years but trying to learn to work on my own truck and finding a knowledgeable mechanic in Chicago when it comes to big cams is like finding a needle in a hay stack. So i think i have a stuck or bad injector want to try priming it. So do i buy a new fuel filter fill it with atf and diesel and leave it in until next change of filter and let the atf work it’s way out of do i change filter once again the next day on Facebook group saw something abt only letting the atf in at idle. Trying to fix issues with truck that has leaked me dry but want to avoid further more costly damage.
@@rcuev118 add atf with fuel and turn it on. Hopefully that'll do the trick. If not, you'll have to run the rack and check injectors.
Great content but way too slow paced
picadito d gabacho
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Algorithm comment
I have a big cam 3 she smokes a lil, but runs strong & no misses..shop ran overhead & I asked about needing injeectors but they she i didnt need them...Whats ur recommendation?
If she's does everything you stated, then she sounds fine. The big cam will smoke especially in colder weather.
@@lifeintrucking.eduardomorales thanx buddy