02 ST4S 25Kmiles
I cannot get these gaskets to seal coolant completely.
Its not gushing out.......a 2 hour hard ride the other day used about 1/2 cup of coolant.
Coolant leaking out of vert head just under exhaust header.
Horizontal out of intake side and slight seepage at base gasket.
No sign of any getting into oil.
I had taken heads off to lap valves etc.No problems with original gaskets...no leaks.
After the valve work I flattened head surfaces on glass with lapping compound and reassembled with Cometic copper base and head gaskets.
I had annealed and then removed oxidation on the gaskets prior to using.
Surfaces were cleaned with engine degreasing spray then dried.
2 coats Permetex Copper Spray on the gaskets and reassembly very carefully to the book with the 3 stage tightening and the retightening after 1st heat cycle then after about 100 km.
After 2-300km more I tried retorquing again....a tiny amount of movement if any altho pretty hard to tell if they actually tightened.
Whats going on here?
What am I missing?
Heads off for 3rd time in under 500km is no joke eh?
Thanks.
Colin.
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