Head gaskets
Ulster - October 13th, 2009 at 06:25 AM
Have pulled down the 1600 twin port motor. It appears that the heads have been blowing Cant find any sign of a head gasket. Did these heads have a
copper gasket which looked like a large copper ring. If the heads do need gaskets where can I get some? regards Bob Sunshine coast.
vw54 - October 13th, 2009 at 08:07 AM
the copper gaskets were done away with many years ago
nowdays its better to have the heads surface skimmed if needed and then lapped each barrel to its head position
wash and remove the lapping paste
matberry - October 13th, 2009 at 08:26 AM
In standard form, copper head gaskets were only used on the 36hp and early 40 hp (stopped in 1960 I think) only due to the style of heater system, to
give a secondary seal to the combustion chamber so as not to risk the occupants with carbonmonoxide poisoning. Now days there is an aftermarket head
gasket available but I believe only for bigger bores.
As Dave said, freshen up the machined mating surface of the head and all will be good.
1500S - October 13th, 2009 at 10:28 AM
| Quote: |
Originally
posted by Ulster
Have pulled down the 1600 twin port motor. It appears that the heads have been blowing Cant find any sign of a head gasket. Did these heads have a
copper gasket which looked like a large copper ring. If the heads do need gaskets where can I get some? regards Bob Sunshine coast.
|
When you re torque the head studs, also make sure the threads aren't bone dry. Many heads leak due to the nut having too much friction resulting in
not enough down force on the heads causing leaks.
Also, what about updating your profile info with at least your area. I can see that it's strung in with the rest of the post but it's always
clearer on the side. That way there may be extra help just around the corner. I never understand why so many on forums don't like giving their name
out or what area they are in.
Hope you don't mind my little rant on this! 
DH
68AutoBug - October 13th, 2009 at 10:47 AM
| Quote: |
Originally
posted by Ulster
Have pulled down the 1600 twin port motor. It appears that the heads have been blowing Cant find any sign of a head gasket. Did these heads have a
copper gasket which looked like a large copper ring. If the heads do need gaskets where can I get some? regards Bob Sunshine coast.
|
Hi BOB
I've seen a few engines with copper rings in the heads...
I believe they are decompression copper rings...
and come in different thicknesses...
I bought some from Mick Motors early in the year....
If they were there originally, put some back... IMHO...
cheers
LEE
psimitar - October 15th, 2009 at 11:36 PM
As VW54 said, get the heads flycut to get rid of any major pitting and then grind the barrels into the heads but mark which barrel has been ground
into which chamber 
matberry - October 16th, 2009 at 05:57 AM
| Quote: |
Originally
posted by psimitar
As VW54 said, get the heads flycut to get rid of any major pitting and then grind the barrels into the heads but mark which barrel has been ground
into which chamber
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Flycut head ...yes; lap barrels...no, you should only need to tidy up the sealing surface of the barrel with 800 wet/dry on glass, lapping into head
will disturb the newly machined surface.
psimitar - October 16th, 2009 at 10:02 AM
| Quote: |
Originally
posted by matberry
Flycut head ...yes; lap barrels...no, you should only need to tidy up the sealing surface of the barrel with 800 wet/dry on glass, lapping into head
will disturb the newly machined surface.
|
Interesting. Yes sanding on glass for a level surface. Good stuff 
Did
you know that they pour molten glass onto mercury to get a nice flat surface. Cool huh?
clinker42 - October 16th, 2009 at 07:24 PM
Guys
What would be wrong with just putting in a copper gasket if you can get one. I presume they would be no thicker than say 15 or 20 thou. That will
make bugger all difference in the compression ratio, and shouldnt upset rocker geometry but would solve the sealing issue.
Can you guys see any issue in using a copper gasket and some threebond.
Trev