Quick Reference - Best Sealants

[GotaT]

Im tearing apart my 2.4 to get rid of Oil Leaks.. I have waynes book and want to know based on Users Use whats the BEST "Sealants" to use on these Areas:


Between Engine Case and Cylinders

Between Cylinders and Heads

Between Heads and Cam Tower


RSR Seals on Rocker Shafts. Anything else added to the rocker shafts on install?


Crank Pulley Seal?

- or any type of similar seal



On All Paper Gaskets ? ie Cam Covers, Valve Covers,


or anything else I've missed


THANKS..

[304065]

http://forums.pelicanparts.com/showthread.php?t=284737&highlight=engine+sealant

[GotaT]

Perfect!!! Thanks!

[Boxer 6]

I like the performance of Dow 730 on the pulley seal. I don't like the price ~$90.00 tube.

[GotaT]

Ok.. The only thing that I did not notice was

Cylinder to Heads.. Whats recommended

Curil T .. as used on cylinder to case

Also,

Some Recommend Three Bond 1104/1194 and others Permatex Anaerobic Sealant for Cam Towers to Heads.

Are they essentially equivalent?

[Boxer 6]

Hi Mitch,

For my 3.2 rebuild, cylinder to heads = nothing. For the cam towers to heads I used Loctite 574. Just make sure everything is sterile clean!

[GotaT]

Boxer.. you say Nothing b/n the Cylinder to Heads..
I am getting some oil leakage bn these on 2 of the cylinders.. What Should I do?

[cnavarro]

http://www.aircooledtechnology.com/store/home.php?cat=311

A good reference for which products can be used where by product.

[GotaT]

I am seeing a little oil leak between the Cylinders and Jugs on, I think, 2 of the cylinders. I'll try to get a pic later. Anyone experience this.. whats the fix? any type of sealant?

[Henry Schmidt]

Case sealing suggestions :

Outer case halves perimeter : Threebond 1104

Bearing web surfaces: Loctite 574

#8 Bearing O-Ring: Threebond 1211

Case Thru Bolts: Dow Corning 111 on Green Viton O-Rings

Flywheel Seal: dry

Front pulley Seal: dry

Intermediate Shaft Cover to Case: o-ring Dow111 , gasket style 574

Oil Breather Cover to Case: Loctite 574

Cylinders to Case: Curil T

Cam Towers to Cylinder Heads: Threebond 1104

Cam Chain Housings to Case gaskets : Loctite 574

Cam Chain Housings to Cam Towers gasket: Loctite 574

Cam Chain Housing Cover to Cam Chain Housing Gasket : Loctite574

Gaskets: Thin coat of Loctite 574

No sealant is used on pulley or flywheel seals and no sealant is used between the cylinders and heads.

[GotaT]

Thanks.. What would cause a little "blow by" between the Cylinders and Heads? ?

[Henry Schmidt]

The leaking that occurs between the cylinder and heads on 911 engines is not blow by.
The leaking is actually leaking oil caused by the fact that the horizontally opposed cylinders allow oil to rest in the cylinders.
As the engine heats the heads seal from the expansion of the components. When hot the heads seal almost perfectly.
As the engine cools the cylinders cool from top to bottom because of the proximity of the exhaust.
Because of this uneven cooling the cylinder to head seal become compromised and the oil resting in the cylinders seeps out.
This was the reason for installing the ever troubling Delivar studs. This uneven cooling is also the reasoning behind the silly no fin turbo cylinder of the late 70s and early 80s.
On the early 964 engines this phenomenon was intensified because of the wider stud spacing and weak head design of those engines.
The only cure for this phenomenon is top quality parts (new cylinders, quality head studs and gaskets when offered) and proper assembly techniques.

[dweymer]

What about the on-engine oil cooler seals? lightly oiled I assume?

[Henry Schmidt]

Originally Posted by dweymer

What about the on-engine oil cooler seals? lightly oiled I assume?

Dry, no sealant or lubricant is necessary on these seals.

[dweymer]

thx