Top end rebuild sealant?
 

I am/will be puting together my P&C's and heads back on my engine. what sealant should I get from our Host :)

Cheers

I used Loctite 574 between the cam housing and heads. This is well documented in Waynes Book.

Top End Rebuild sealant
 

I am using the threebond 1211 it is a white silicon that is excellent. It seals very well, cleans off reasonably easily and is easy to use, as are all their products I have used.
Threebond is used extensively in many Japanese cars and bikes as genuine assembly sealant!
Regards Mike

Loctite 574, Loctite 518 (available at your local NAPA), Threebond 1104 (aka "Yamabond") and Threebond 1211 will all work. Here is a great thread on case sealers.
-Chris

I,am rebuilding a 3.6 engine and used the dow 730.I think it is better than the 574.Its about $85.00 for a tube but I think it is worth every penny.Its approved for aircraft,and its thicker than the 574.I know some local porsche dealers that are using the 730 and I was told that they dont want there customers coming back with leaks and dow 730 gives them some extra insurance.When you weigh the price of the sealant against the amount of work if you have to pull the motor and split the case I think it makes sense.

I used Yamabond/3bond 1104 for sealing both the case as well as the heads/cam towers. It's what PMNA uses so good enough for me.;)

http://forums.pelicanparts.com/uploa...1108953131.jpg

Ralph

I never heard of this stuff.How much and where to do get it?Who makes it?What is its original purpose?Thanks

You can get yamabond at any yamaha motorcycle or waverunner store. It is what Yamaha recommends to use on the engine cases of two cycle engines to prevent vacuum leaks (vacuum leak= lean running 2 cycle= burned piston.)

This is what Jerry Woods uses on his builds. I guess if it goes 24 hours at LeMans, it will do for our lowly heaps. ;)

George

My only concern with using Yamabond or Dow 730 is that they don't harden like the 574. It may not be a problem but it's something to consider.

I dont know if hardening is a good thing or not,but after 1 week of curing the 730 feels right to the touch.Its the stuff that they put airplane engine cases together with.That says somthing aout a product.

The quality of a sealer to remain soft is a huge advantage in the assembly of a 911 engine because of the amount of expansion and contraction, found in the engine as it heats up and cools down! The other time the engine flexes is under load, using big revs and in high hp engines. This is why people shuffle pin the two crankcase halves to reduce this movement!
Regards Mike