Did a leak down test on the GT6 motor. Retorqued the head to 75 lb ft.
Performed test, and cylinders 1-5 were leaking through their exhaust valves.
All cylinders were also leaking through the head gasket, but ONLY on the left
side (opposite intake/exhaust ports). Pulled the head, and the intake/exhaust
(right) side of the gasket looked fine, but the left side had oil and water on
the gasket, both top & bottom of gasket.
So, it's got leaky exhaust valves, and head gasket leak. Possibly the head
studs are too long, since the head has been machined who knows how many times?
Perhaps the studs are stretched? Also, one pushrod is a touch shorter than the
rest. I think this can be adjusted for, but it would make the geometry a bit
off, correct? The pushrods are also a slightly different design than on my
spare engine. With the head milled a bit, still use the original length
pushrods?
This is all puzzling to me and my non-professional but competent mechanic
pal.
Ed Dunn
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