• Hi Guest! Being a Paying Supporter is NOT a requirement to participate at BCF. However, subscribing will help ensure we can continue to serve the LBC community for years to come. If you enjoy BCF and find our forum a useful resource...Please consider supporting us by **Upgrading**
    (PS: Subscribers don't see this banner)

TR4/4A Head Gasket Issue


Jedi Trainee
Recently I've been losing water from the rad; pulled the valve cover off and around #1 I/E valve springs noticed the familiar white mix.
Have taken the head off and it seems to be fine. Straight edged the heck out off it and all ok.
Have used a copper head gasket & cannot detect issues with it. Maybe I missed something so will re-check it am.
Block looks good after cleaning it up a bit. Planning on draining the pan to check for water. Nothing on the dipstick.
So I'm thinking it's something in the top end.
I have the 89mm set and am wondering about going with a Cometic Head Gasket. They only come in the 88mm.
size. Would that be usable?
Thanks Everyone,


Luke Skywalker
Country flag
Was your copper gasket solid or sandwich? Solid can be a real problem. Check that your head studs are all good. Are the number one and two sleeves protruding the correct height (in thousandths) above the block? Don't know about the 88-89 issue, but I seem to recall the Moss catalogue or BPNW site saying that gasket size works. But I'm just not sure--sorry.


Obi Wan
Country flag
How long ago did you build this engine? Another thing to look at would be the stud holes in the block...sometimes you need to chamfer them to make sure the head and head gasket fit all the way down on the block. You should be able to measure them with a straight edge across the holes.


Country flag
I remember when I rebuilt my 4a engine with 87mm pistons and used a standard, 86mm gasket. It didn't seem to cause any problems and the engine ran very well for many years. I don't know that I would recommend it if a proper sized gasket was available, but it seemed to work.


Jedi Trainee
Think I know the problem after listening to a buddy who was using a straight edge on the block & head.
The liners aren't protruding from the block enough. Will know tomorrow when I can take a look at the car.
Similar threads
Thread starter Title Forum Replies Date
Csarneson Head Gasket Seal Austin Healey 6
R Cylinder head gasket BJ8 Austin Healey 32
B TR4/4A Head gasket won't lay flat Triumph 13
Michael Oritt Head gasket question Austin Healey 17
Got_All_4 General TR Payen brand head gasket sets what's the difference Triumph 10
Simmo TR2/3/3A Head Gasket Triumph 4
KVH General Tech Head Gasket Triumph 10
RJS General TR Head Gasket Test Fit Triumph 5
D TR2/3/3A head gasket... which way up?! Triumph 8
KVH TR4/4A Blown Head Gasket? Triumph 12
T TR4/4A Head gasket sealer question Triumph 7
T TR4/4A How to prep block to reinstall head for composite gasket Triumph 3
T TR4/4A Composite vs cooper head gasket with Randall's "trick" Triumph 6
T TR4/4A This head gasket doesn't look right to me - cooling passanges partially blocked? Triumph 18
Got_All_4 TR2/3/3A What direction does the head gasket go? Triumph 4
T TR4/4A Best head gasket for a 4A? Triumph 12
DornTRoriginal TR2/3/3A TR3 Head Gasket Questions Con't Triumph 3
B Victoria British Head Gasket Austin Healey 6
T TR4/4A Seems like a bad cylinder head or head gasket but what do you think? Triumph 19
G Payen XK engine head gasket -- which side is the top? Jaguar 2
KVH General TR Cylinder Head Gasket: Stay Simple? Triumph 9
S Recommendation on Head Gasket? Austin Healey 14
S Tolerance for head gasket Austin Healey 10
RickB MGB Bought 1980 MGB and got it home - head gasket? MG 15
Gliderman8 TR6 Question on installing new head gasket Triumph 2
RedTR3 TR2/3/3A How to check for cylinder-to-cylinder head gasket leak Triumph 7
B Experience with Cometic Head Gasket for BN2? Austin Healey 8
S SaxMan's Cylinder Head Overhaul / Head Gasket Replacement Thread Spridgets 135
M TR2/3/3A Head gasket leaking in two places Triumph 13
S TR2/3/3A head gasket Triumph 5
AngliaGT General MG MGB GT Head Gasket - What do I need? MG 3
G TR2/3/3A TR3/TR4 Cylinder Head Gasket SElection Triumph 2
B MGB 1972 MGB, Head Gasket replaced...runs very poorly. MG 30
O HEALEY 100 Head Gasket Gone ? Austin Healey 10
J Blown head gasket in 3 min. a new record! Triumph 14
Lukens TR2/3/3A TR3 blown head gasket? Triumph 39
L 1275 Head Gasket Spridgets 7
M persistand head gasket leak 1959 mg 1600 MG 3
RedTR3 TR2/3/3A TR3 Head Gasket [Again] Triumph 4
RedTR3 TR2/3/3A TR3 Head Gasket Triumph 6
DNK The Head Gasket Triumph 27
Boink Head gasket recommendations... Spridgets 13
Morris Blew another head gasket... Spridgets 15
Stewart I sure hope its just a head gasket MG 8
6 MGB 79 MGB Head Gasket Screwup MG 7
D Head Gasket Triumph 31
M Head gasket use sealant or not Austin Healey 7
M Head Gasket Orientation Austin Healey 2
M Head gasket replacement. Austin Healey 6
T Replacing Head Gasket help Spridgets 4

Similar threads