what to use?, just oil or sealant or nothing? Options

[jacksun]

hi,

this question is about the push rod tube seals and what to use if anything?

I have read many opinions... still not sure

if I use a sealant like permatex high temp thread sealant,,,,,,,,,,

where would I place it......A or B or not ?

the seals in the image are old and not replaced yet

thank you

r

[Jake Raby]

I've done it many ways. No matter what method is used, the main issue is the tearing or injury to the seals during install. Many sealants don't just seal, but they are very slippery and make up for situations that would normally tear the tube seals.

The key to using engine oil for assembly of these tubes is to hone the pushrod tube bores in the heads and case until there are no burrs or sharp edges.

IMHO there's only one "wrong way" to install the tubes, and thats any manner that allows for them to become torn during install.

My current favorite for installation of the seals is Dreibond 1248, which we use primarily on M96/M97/DFI Porsche engines as a case sealant. It goes on clear and stays that way. It also doesn't enter the oil system badly and doesn't have huge silicon values that show up in used oil analysis.

I like that its clear, because I don't have to explain to people about why we "do it wrong" when they do their first valve adjustment.

Also, Molybdenum Disulfide assembly lube works in place of grease or oil very well. It is so slippery that tube seals are very difficult to tear. But it'll show up like mad for the first 4-5 used oil analysis.

This post has been edited by Jake Raby: Jul 9 2014, 07:57 AM