Which repair manuals for 915 trans work?

JR911 · 01-20-2002, 07:38 PM

Well it looks like it is going to be trans-teardown-time real soon. Sure don't like the thought of loose pieces of dog teeth etc. free to wander inside my trans! I will open it up and evaluate the wear etc. then choose my options whether to re-build mine or buy a used or new re-built unit.

This brings up another question I've had, if you buy a used trans from a parts yard how do you know that it will be any better than your old unit? Do the parts yards document the mileage on a used one?

Has anyone ever put broken dogs teeth from their trans under their pillow at night to see if the Tooth Fairy would leave a little cash to help with the re-build costs???

I've read that the Bentley repair book is good but I don't know if it covers much on trans work. I would need the one that covers the 86 Carrera. I do need a good manual for other up coming repairs/re-building other than the trans work.

Thanks again!! J.R.

cds72911 · 01-21-2002, 05:49 AM

If you have access to the factory manuals they have a whole book on the 915 transmission.

Charlie

john walker's workshop · 01-21-2002, 08:41 AM

if you can't drive the used trans, then it should be considered a core and priced accordingly. you're better off rebuilding the one you have. the bentley book has a pitifully short section on the trans. it helps a bit though.

Jim Sims · 01-21-2002, 08:43 AM

Speaking from the middle of a 915 rebuild job I feel that one really needs access to the factory shop manual; the Haynes and Bentley books are missing a lot of information like tables of torque values, charts of wear limits, tooling procedures, etc. If you do this job, most of the tools may improvised (see recent threads on this topic) but one will likely still need the plastic jig to set up the shift forks, a shop press to install new dog teeth and possibly a 1-5/8" (41 mm) crows foot wrench if you want to actually torque the input shaft nut to a known value. I expect it would be hard to do a reasonable DIY job of a 915 rebuild without spending at least $600 on parts and tools and $800 to a $1000 may be more likely. This is getting close to the rebuild costs that commercial operations charge. However one should check to see what is really included in these rebuilds. If they're just replacing synchro rings and the seals (it appears your unit will also need a set or two of dogteeth and an operating sleeve at the minimum) for the base charge and everything else is additional, the cost will be much more than the advertised amount ($1000?).

Some salvage yards may note the mileage on a vehicle that parts were pulled from but not always. Sometimes one can get a very limited warranty on the item (90 days, 5000 miles) and then they just give you another used unit if the first one fails.

Cheers, Jim