How to REPLACE THE TRANSMISSION MOUNTS on a Porsche Boxster 986 | DIY (Project 36)
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- Опубліковано 10 лют 2025
- Today I replaced the worn out and leaking transmission mounts on my 1998 Porsche Boxster 986. I found a puddle of oil on the garage floor and I was getting some white smoke from the rear of the car when starting it. Turns out the hydraulic transmission mounts were leaking! Made a DIY tutorial of the removal and installation of new parts.
Project 36 from the 101 Projects for your Porsche Boxster book.
If you want to buy an "I AM THE WARRANTY" shirt OR if this saved you a good deal of time and/or money and want to buy me a coffee or a beer, you can do those things right here: ko-fi.com/help...
Performance transmission mounts:
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Swivel socket set:
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Milwaukee Fuel Ratchet: amzn.to/2SDsWjt
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101 Projects for your Porsche Boxster book:
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986 Service Manual:
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Here is the QuickJack lift that I use:
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I am a Do It Yourself, also known as DIY, mechanic. I am NOT a professional mechanic. I do not have any formal training in the automotive field.
Help Me DIY assumes no liability for anything you choose to do to your car, before, or after watching one of my videos or utilizing the content from this web site.
All DIY repairs or modifications you perform to your car are made at your own risk. Sometimes, even if you've done everything the right way, you can destroy or damage one or more things on your car. You must understand this, but by leveraging knowledge and patience, the probability of encountering one or more problems can be reduced.
Also, if for some unfortunate reason, I do give incorrect instructions and something breaks because you followed my instructions, I will NOT reimburse or pay in any way for whatever cost that may be incurred due to following my wrong instructions.
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Great video, thanks so much. A couple of notes to add:
The bolt you need to counterhold on top of the mounts is a 13mm.
Once I had everything off the car, I used a long 26mm wrench to grab the flat/square profile on the bracket and a 3/4" 18-point socket head on a long ratchet to grab the star nut on the old mount itself. I set the wrench and ratchet about 3* apart, so that I could hold both in one hand, held the bracket with the other hand, and from there a firm squeeze was enough to break the nut loose.
+@ROConnellCA glad it helped! Thanks for the extra info! 🍻
@@HelpMeDIY Couldn't have done it without this video!
After watching your video I ordered the mounts to complete the job.
Thanks.
Semper Fi
+recon20671 nice!
I did the exact same thing when I got my first 986. Great Ace Ventura voice when you read the "Do not remove fastener B" haha.
+Yue Fan hahahaha love that movie!
Great video and thanks for the information. I saw the leak on my 2001 boxster but didn't know the mounts were hydraulic. I took the engine cover off expecting to find a power steering fluid leak or clutch line leak just making it's way to the back of the car. Nope, hydraulic fluid from the mount....an hour later lol
Note to self....just buy the mount with the bracket lol
Thanks again for the method of removal.
+Shamileification yes, this is the kind of info I wish I had going into this 😂 🍻
I have an 03 Boxster S. These are great videos. I have that book as well. It is required reading if you want to work on your own car.
+Jess H I agree!
If you have replaced the transmission mounts did you use the same ones he did in the video? I have an 03 Boxster S as well with the tiptronic. Trying to triple check whatr mounts I need so I don't accidently order the wrong ones. Thanks for any possible help.
Aaron, aaron.....aaron. square end of the bracket under the mount. Nice place for a wrench to keep from bending your bracket
+Aaron Nichols haha why didn’t I think Of that!?
@@HelpMeDIY because you are THAT excited to show us
Aaron Nichols must be it!
I was yelling at my computer again....
Ooh that was a struggle but as always Aaron you made it. I wonder if some blocks of wood would get the jack to work at full height on that lift ? My pal gives me his De Walt impact wrench but you’d need a vice , otherwise the earth spins 😂🏴
+Iain Mcglynn haha yes
Next time use a couple of lag bolts and bolt the old mount directly to your bench top to take the nut off. Thanks for the video.
+kelly johnson you’re welcome!
E for effort brother. You remind me of myself.
+Cash Dollar thanks. You must be pretty awesome! 😎😂
@@HelpMeDIY Well played!
Have you had experience changing the Boxster S, passenger side, transmission mount. Apparently radically different than than a standard Boxster. Thanks for your input!
+@chrisobradovits408 no, but check out my video on my 987 transmission mounts and see if they are similar
What if I got a 993 mount (as 3:37 marked), can I replace it directly into a Boxster? Or do I have to reshape the bolt? Thank you very much🙏🏼🙏🏼
+Cheng Ivan I don’t know. Maybe someone else can chime in on that.
Help Me DIY Thank you for your reply. Because I found that the big bolt (literally the fastener B) of 993’s mount seems much longer than Boxster’s, so I’m wondering it will hit the struts or what if I just directly replace 993’s to a Boxster…. **I found that the price of 993’s OEM mount is much cheaper than Boxster’s 🤩
@@chengivan1275 oh ok good to know, thanks!
Just a point of safety….Quick Jack recommends the use of “auxiliary safety stands” when using their equipment. Would suggest you mention this in using the jacks. Just received mine and pleased I read the Setup and Operation Manual. SAFETY FIRST!
+@chrisobradovits408 that’s some CYA on their part. The quick jack uses the jack stand locations on the Porsche.
@@HelpMeDIY I phoned and they suggest a stand, such as a drive up ramp under the tires. This would allow a significant backup measure. Yes, it is a CYA but likely have experienced someone not using the lift properly and it coming down. You can’t fix stupid so you’ve got to guard against it!
Your video’s are great!!!
@@chrisobradovits408 thanks 🍻
Thanks for the video :D
+TheXbaT you got it! 🍻
Ignoring for a moment that you don't own a vise, you realize that an ordinary open-ended wrench would fit nicely on the square section of the mount you bent up...
+Adam Miller 😂 well it all turned out ok
Recommend having whole car on stands level? Or can get away with doing this on ramps in the rear? Thanks!
+Brian Sturgill I can’t think of a reason it would need to be level 🤷♂️
Do you know part numbers for the two 15mm bolts attaching the bracket to the transmission?
+Tim Waire not off the top of my head, but I have a whole video on how to find Porsche part numbers if you search my channel
My 1999 boxter with 105 k on is for sure due for this. I wonder what the symptoms are when these start to go bad? When my car is cold and I shift I hear a metal bang but as soon car warms up it stops. Its not a gear or clutch sound, like something is moving
+Fly Gor that doesn’t sound good…
@@HelpMeDIY sounds good when I let her warm up 😜 my guess is when the oil filled mounts warm up that is when it stops competely. At any rate thanks for the video I ordered a motor mount and the tranny mounts. Again great videos 👍
@@ConservativeUSA67 thanks!
Would recomend removing the gorilla tight nut with an impact driver?
+recon20671 no, I would buy the whole bracket next time
Being there is more than one way to do this I'll share how I did it on my 2010 Cayman. I used a tripod screw jack under the transaxle for the support part of the operation and then worked on one at a time. I broke loose (just) the 2 small top bolts on the rear subframe and then used a spline wrench to remove the big funky nut on the bottom. The factory mounts have that square portion on the stud shank to keep it from spinning. After that I removed the top bolts and installed the WEVO semisolid mounts to the subframe using a drop of blue Loctite on the bolt threads. I Torqued the top and then the bottom to spec; then on to the other mount. I never removed the brackets from the transaxle.
+Warren Lucier thanks for taking the time to share another method! 🍻
My transmission mounts are very different looking than the ones I see on forums and UA-cam videos. The black triangle is held onto the gearbox mount by threaded studs, not the two bolts I see in the 101 Projects book and online. (Part #986.375.15400.) There is no bolt pattern or easy way to unscrew. Looking for suggestions and DIY tips. Thank you.
Hi I have a 2004 automatic, my question is: is the same motor mount than a standard ?
+Esteban Sanchez great question. I think the answer is yes, but I would do a Google search for your specific car or just call any Porsche dealership and they can look it up by your VIN.
@@HelpMeDIY Thanks :)
I have a small "clunk" sound when I accelerate a bit more aggressively from stop to go, and from 1st into 2nd gear (don't hear it when going up higher in the gears). The sound is coming from my passenger rear wheel area. Am I looking at the right video, is this most likely an issue with my transmission mount? (986 S year 2000 w. ~70K Miles.)
+Johannes Hetland maybe? Or it could be the engine mounts, or both? I’m not the best at diagnosing issues, especially online. Sorry.
@@HelpMeDIY Thanks, yes - I think I'm going to have a go at both engine mount and transmission mounts while I'm at it. Btw - love your videos, very helpful!
Johannes Hetland thank you! 🙏
A new engine mount did the trick!
Johannes Hetland yessss!!!
on the manual, it states that we cannot remove the fastener B.
How are we able to remove the old mount and replace the new one on the old bracket?
+Henry very carefully! 😂 You can see I bent it some when I did it and had to reshape the bracket. Use of a vice will help.
@@HelpMeDIY I watched the manual in your video and it states that removing nut B would damage the transmission mount. Therefore, I remove nut B carefully enough and a new transmission mount would be great, right?
@@henry48181 it did. A little. You can see in the video that it bent the bracket when I removed fastener B. I just bent it back into shape. Not the Porsche recommended way obviously so do so at your own peril. I would do it again though, just being more cautious
@@HelpMeDIY thanks for your detailing response :)
@@henry48181 you’re welcome!
and what was the result when driving?
+John Poo I never really felt a difference. I think I caught it before it became noticeable.
Jesus, man. This was painful to watch. You buy a jack for a grand but can’t get a 50 dollar vise?
+MickHornbak haha sometimes you just have to make it work with what you have.
Help Me DIY I agree. But you also gotta know when to call it quits and get the proper tools. That being said, I appreciate your content and I think it’s still valuable for viewers to learn from your mistakes. Quick question: how are you supposed to swap the frame to the new part without removing that screw?
MickHornbak yeah seeing someone’s mistakes is often then most helpful information you can get. You can’t swap them without removing that screw. Someone else mentioned it could be loosened first, while still attached to the transmission:)