Just another set of data points from my recent 3.2 to 3.4 rebuild. Grateful for all the good information on this thread and to no longer have any oil on my garage floor.
Sealants:
Case perimeter: Threebond 1184
Case webs: Loctite 574
Through bolt o-rings: Molykote + tiny amount of Hondabond 4 on washers
#8 Bearing: Threebond 1211
Cylinder base shims: Curil-T
Heads to cam towers: Threebond 1184
Oil breather gasket: Hondabond 4
Chain housing to heads: PFTE grease on o-Ring, Hondabond 4 on gasket
Chain cover to case gaskets: light Hondabond 4
Chain cover gaskets: dry
Oil return tube o-rings: Molykote
Int Shaft cover gasket: Hondabond 4 failed, switched to Loctite 574 with new gasket.
Rear Main seal: Installed dry outer edge, light PTFE grease on inner to prevent burning on initial startup.
Leaks and fixes (none of the leaks were enough to even cause a drop on the floor):
- Intermediate shaft cover gasket. Was leaking around one of the bolts. Pulled off, removed studs, reflattened, Henry recommended loctite 574, new gasket. This fixed it.
- Valve cover driver's side, torque to 10nm. Slight leak forward corner. Tried plain type, green with silicone bead (worse) and now black graphite type. Yes I tried increasing the torque. Didn't work. TBD
- Oil Cooler lower ring: green one (small drip), red one with PTFE silicone grease (no different, small drip), going to try green one with Curil-T. The first 2 I could tell they just were not thick enough to get a crush. This is maddening.
- Lower oil pressure relief valve bolt: wetness around the aluminum washer. New crush washer and re-torque. Same thing. Noticed the washer wasn't centering. 3rd time: measured new Porsche bolt to original bolt. New one was over 1mm smaller at the chamfer that seals and centers the crush washer. Damn. Hopefully fixed it.
(new on right)
