915 Diff assembly

Here's my second post on this. Took Diff apart to clean. All is good. Can I just bolt it back together? What are the torques for the axle stretch bolts and diff housing? Thanks

Have I stumped the board? Maybe I'll get a prize?

Tomorrow I will post pictures of one of the dead mice I have removed from the interior. I wonder what the record is for finding dead mice in a porsche. At least they have good taste in vehicles.

[djmcmath]

Ok, I'll admit that I put mine back together with no special procedure or tools. The Bentley's says that torque for "Flange to differential" is 44Nm or 32ft-lb. The spec for the housing cover bolts is "tight enough that they're tight, but not so tight that they're too tight."


Dan

[beepbeep]

If you didn't touch enything else and haven't dissassemblde the dif itself then I see no reason why you couldn't bolt it back together. Pinion depth hasn't changed or anything.

[Jim Sims]

Summarized from the factory shop manual:

Coat main differential gears with Molykote or MoS2 paste; coat thrust surfaces of small differential pinions (spider gears) and large differential pinions (side gears) with Molykote or MoS2 paste.

Carefully lower differential assembly in place (do not let it fall onto the under side roller bearing/race - support with a soft tool or stick from below). Assemble cover (don't forget the new cover o-ring) and temporarily install the cover side output flange (no bolt required). Use the output flange to turn the bearings as the flange cover nuts are tightened in a crossing pattern to 16 to 18 ft-lbs. This ensures the bearings seat properly.

The output flange attachment screws are not "stretch bolts" but rather "expansion bolts"; they may be reused. There are two different arrangements and hence tightening torques. If the bolt has a washer under it, then tighten to 19-22 ft-lbs. If there is not a washer, then tighten to 28-33 ft-lbs.

Cheers, Jim

Thanks Jim. Off to get some molykote today. All I have are Waynes books and the Bently, which state assemblying of differetnial is beyond the scope of this manual.