Hello List,
I'm troubleshooting a new rebuilt TR4A engine that's having a problem. It runs,
but only with a very rich mixture, and won't idle less than 1500 RPM. Starting
is difficult. When hot and turned off the engine keeps dieseling (probably
because it's too rich - the SU's are at 4 full turns).
The engine has everything new, including distributor and "Curto" rebuilt carbs.
Compression is at 210 each. Stock cam. New timing gears and chain. 87 mm
pistons balanced with crank. I've changed the manifold gaskets, reset the
valves, advanced and retarded the advance.
Normally I'd associate this type of problem to an air leak, but I've searched
and can't find one. The crankcase breather has a new diaphram.
Could the timing chain have slipped a cog? Looking at the manual, and spinning
the crank to see when the valves open/close it appears to be off (it's late),
but not by much. Can this sympton be caused by timing error? I'd hate to open
up the front end of the engine just to find out it's just fine.
Any other ideas?
Thanks!
John in San Diego
'67 TR4A CTC75157
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