cometic head gasket & sealant

General Chat About Exhaust, Cylinder Heads, Fuel Systems And Intake

Moderator: phpBB2 - Administrators

Post Reply
User avatar
Seight-V8
Knows His Stuff
Knows His Stuff
Posts: 559
Joined: Sun Jul 01, 2007 10:12 am
Location: https://t.me/pump_upp
Contact:

cometic head gasket & sealant

Post by Seight-V8 »

Hello all,

Got a set of john eales head studs to go with some new cometic head gaskets....

Cometic say install the gasket dry with no sealant but john has suggested a thin layer of hylomar between the layers?

Anyone else used sealant on a cometic gasket to stop oil seepage across the gasket?

And if so where do you use the sealant.

cheers

scott



mgbv8
Forum Contributor
Forum Contributor
Posts: 5326
Joined: Sat Nov 18, 2006 7:57 pm

Post by mgbv8 »

I have only ever used my cometics dry. I have removed and re used these gaskets 14 times on two different Rover V8's with no leakage issues :)

Perry Stephenson

MGB GT + Rover V8

9.62 @ 137.37mph

Now looking for 8 seconds with a SBC engine

http://www.youtube.com/watch?v=nVscbPHgue0&list=UUqIlXfSAoiZ--GyG4tfRrjw



https://www.youtube.com/watch?v=eg3avnsNKrc&index=2&list=FLqIlXfSAoiZ--GyG4tfRrjw

stevieturbo
Forum Contributor
Forum Contributor
Posts: 3979
Joined: Sat Nov 18, 2006 6:22 pm
Location: Northern Ireland

Post by stevieturbo »

if the heads/block are machined correctly, no sealant is needed.

If they are not machined correctly...get them machined correctly lol.

Smooth as glass basically.

If you really were busting to use some sealer somewhere, I guess a very small amount of non setting stuff around any oil or waterways.
9.85 @ 144.75mph
202mph standing mile
http://www.youtube.com/watch?v=XgWRCDtiTQ0

garrycol
Knows His Stuff
Knows His Stuff
Posts: 527
Joined: Thu Jul 16, 2015 2:47 pm
Location: Australia

Post by garrycol »

I have never used any sort of sealant around the main sections of a head gasket but do put a light smear around the water passages.

Garry

User avatar
Seight-V8
Knows His Stuff
Knows His Stuff
Posts: 559
Joined: Sun Jul 01, 2007 10:12 am
Location: https://t.me/pump_upp
Contact:

Post by Seight-V8 »

cheers everyone.

Fitted them dry, so no sealant.....will re-torque them again after then engines first run.

Block & head faces had just be re-skimmed so have a good surface on them, so hoping for no leaks.

regards

scott

Post Reply

Return to “Exhaust, Cylinder Heads, Fuel And Intake Area”