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Which head gasket? #771910
04/24/19 5:45 pm
04/24/19 5:45 pm
Joined: Oct 2008
Posts: 5,438
Crossville, TN
DavidP Offline OP

BritBike Forum member
DavidP  Offline OP

BritBike Forum member

Joined: Oct 2008
Posts: 5,438
Crossville, TN
Gonna take the head off my Trident to decoke and fix oil leaks. I spent time last night reading the posts I could find, here and TOL. I found no definitive opinions on this subject.
I have a complete gasket set from Big D which includes the original fire-ring gasket. I also have a used copper head gasket. Assuming that the liners still sit proud of the gasket surface, which head gasket would be better?
From my experience with my last Trident, the push rod tubes didn't leak until I used a copper head gasket. However, I knew nothing about checking squish at the time.
I use Indian Head gasket cement and I always retorque after the first short ride.
Thanks


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Re: Which head gasket? [Re: DavidP] #771957
04/25/19 2:54 pm
04/25/19 2:54 pm
Joined: Apr 2005
Posts: 1,747
Mississauga, Ontario.
A
Adam M. Offline
BritBike Forum member
Adam M.  Offline
BritBike Forum member
A

Joined: Apr 2005
Posts: 1,747
Mississauga, Ontario.
Yes, good question about liners sitting proud of cylinder deck.
Mine sit partially proud, partially even and partially sunken in a cyl block.
Next time I take my cyl head off I am going to machine cylinder block to get an even surface and will use Cometic gasket
I'm using now because it holds the top end better than composite or copper. Without machining I still can feel some blowby
on the left ( primary ) side of the head.
I didn't glue my pushrod seals and oil is leaking like crazy from all of them, however I tried to get a proper crush for every
pushrod independently.
After few good trashings they started leaking, so the next top end service will consist of cylinder block machining, new Cometic
cylinder and head gaskets and covseal gaskets for rocker boxes which by the way are doweled in cyl head.

Re: Which head gasket? [Re: DavidP] #771965
04/25/19 6:08 pm
04/25/19 6:08 pm
Joined: Mar 2006
Posts: 1,430
Magnolia, TX
htown Offline
BritBike Forum member
htown  Offline
BritBike Forum member

Joined: Mar 2006
Posts: 1,430
Magnolia, TX
+1 on the Cometic if your liners have settled.


1978 Bonneville T140E
1974 Trident
1970 BSA Thunderbolt
1971 Norton Commando
1972 Norton Commando
1973 Norton Commando
1974 Norton Commando
2018 Kawasaki Z900RS


Everything will be alright in the end. If its not alright, its not the end.
Re: Which head gasket? [Re: DavidP] #771973
04/25/19 8:47 pm
04/25/19 8:47 pm
Joined: Jan 2019
Posts: 9
Ash, Hampshire, UK
Esmerela Offline
BritBike Forum member
Esmerela  Offline
BritBike Forum member

Joined: Jan 2019
Posts: 9
Ash, Hampshire, UK
Hi

Anyone have the part number for a Cometic multi layer head gasket ?

Regards
Esme

Last edited by Esmerela; 04/25/19 8:49 pm.

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The older I get, the faster I was
Re: Which head gasket? [Re: DavidP] #771980
04/25/19 10:23 pm
04/25/19 10:23 pm
Joined: Mar 2006
Posts: 1,430
Magnolia, TX
htown Offline
BritBike Forum member
htown  Offline
BritBike Forum member

Joined: Mar 2006
Posts: 1,430
Magnolia, TX
I got mine through TriplesTec.
https://www.tripletecs.com/


1978 Bonneville T140E
1974 Trident
1970 BSA Thunderbolt
1971 Norton Commando
1972 Norton Commando
1973 Norton Commando
1974 Norton Commando
2018 Kawasaki Z900RS


Everything will be alright in the end. If its not alright, its not the end.
Re: Which head gasket? [Re: DavidP] #772053
04/26/19 8:34 pm
04/26/19 8:34 pm
Joined: Jan 2019
Posts: 9
Ash, Hampshire, UK
Esmerela Offline
BritBike Forum member
Esmerela  Offline
BritBike Forum member

Joined: Jan 2019
Posts: 9
Ash, Hampshire, UK
Thank you, I will email them.
It's worth visiting that site for the race bike gallery, never mind anything else.

Best regards
Esme


[Linked Image]

The older I get, the faster I was

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