Porsche 911 Transmission Repair

This transmission came to us in a 1983 911SC. The first complaint was a fuel smell, and a reported fuel leak. So, we went ahead and did the fuel lines in the tunnel.
Next we took a test drive on the transmission. Work had recently been done, but the shift was not as it should be.
When we opened up the transmission, it was clear it had not been rebuilt in some time. Silicon sealant was an indication that it had been opened at some earlier time in its life.
After replacing all the synchro rings, bearings, and most of the dog teeth, it was time to reassemble and measure. The bearing drag, pinion depth, and crown wheel backlash were all out of specification. With a bunch of shims from Porsche, we got this 915 transmission back within tolerance.
After all the new parts, this transmission needed extended road testing. With everything settled in, it was time to send this silver bullet on its way.
If you need more detail, please check out our transmission playlist. Here you will find hours of transmission rebuilding. As well we cover setting up the VW 383 tool.

Thanks for watching

[georgehintenbergerpa]

I have the same issue with my 1st gear. Won’t go into 1st unless I come to a complete stop. Otherwise it will grind.
Now I know what to expect.
Thank you

[quigles]

Absolute pleasure watching a master at work.

[chuckglass]

Outstanding work kurt! I just wish I'd found you first. You do ethical, honest work, thank you again.

[KeithShafer]

Awesome video. I recently had my 915 rebuilt and I asked for all the parts that were replaced and while everything was explained it was a bit overwhelming. Nice to go back and compare with your excellent video.

[johnfreeman]

Another outstanding video with great tips!

[christiandunn]

Another really informative video. Thanks, keep em comming!

[refuztosay]

Don’t you just love having to fix not just the assembly’s wear problems but the problems created by the Jack-leg mechanic who had his hands on it previously. As a mechanical engineer in the automotive industry - it’s a pleasure to see someone with solid skills maintain the powertrain by adhering to proper technical specs and repair guidelines. Customers can depend on this guy in my opinion.

[classicporschesforsale]

Kurt, I love your videos. We keep them up next to the bench while doing rebuilds as a refresher and cross reference. For the DIY, what cleaners do you recommend for the case and internals? If the case is sealed and we just want to freshen up externals to remove gunk before reinstall, what's a good process for cleaning the outside case?

[saqibnawaz]

Vry wonderful Encouraging cleaning of porsche transmission seems coming new right out of foundary vry great 915 porsche transmission rebuild & street driving checked gear shifting happens butter smooth bkums reliable porsche

[jasonwright]

Recently found your channel and it's very informative and well put together. It's very clear that you know your onions! I have just done a transmission fluid dump and noticed a small piece of what I know now to be a dog ring tooth. It was stuck to the magnetic drain plug. My Transmission was rebuilt about 5 years ago by a local specialist and it has always been a good shifting 915. In fact, it is still shifting well even minus one tooth. However, I am conscious of further damage and I am starting to think about a rebuild. Seeing as you are on the other side of the planet to me, I guess I will have to think about doing this myself. :-) I rebuilt my engine in my garage and I have a pretty good set-up, so I am quite confident that I could attempt it. However, it's the final set up of the Diff that I am worried about as I believe that there are some special tools required? I did this job on my MGB years ago and it worked out well, but I think that was mostly down to luck. Do you think this is a job that can be tackled by an Engineer who happens to be a hobby Mechanic? Many thanks and keep up the great content!

[mikeyatesautomotive]

Great video bud, how much did the parts & labor come out to ?

[ft]

Amazing videos. I've watched this and the earlier series on 915 transmission rebuild several times. I have similar issues with my 915 on my 1973 911E. Can you share a list of the specialist tools which you used/recommend to do a similar rebuild?

I never plan to sell my car and plan to do a rebuild and change all the parts which wear out. I see you focus on syncro rings, dog teeth gears, bearing and bearing sheaths. What else do you recommend changing?

[Paul_VanGo]

Even in the lucrative Porsche market, some shops have the audacity to cut corners and sell 100k mile old boxes as reconditioned.

[andrecampbell]

Approximately, how much would this rebuild cost?

[blkcoupequattro]

Interesting, lot of gear shops would steal good parts from your gear box swap in worn parts, and put new synchros in it, and hope you don’t come back for a year or more when it’s out of warranty… Proper rebuild right here ….

[blueocean]

Is it true that the 915 has no neutral detent?

[diogeneslamp]

What do these parts and labor run on this repair?