I'm helping with a friends late model M42 from a 1995 that burnt an exhaust valve on the #1 cylinder at 370k km and would like some light shed on some questions. Apparently the stock valves are sodium filled, are the aftermarket ones as well, or are they stainless like I have seen advertised? If they are different, do heavier springs need to be ran to deal with the extra valve weight?
Reading around, it seems M42 heads are prone to cracking and dumping coolant - this one didnt seem to use any coolant and was never overheated for the near decade my friend has had the car - were the later model heads changed to address the cracking issues?
I was planning to freshen up the timing drive while we are in there. The guides are in poor shape, the chain seems to have typical wear for its age. Are there timing kits available (guides, chain, tensioner) or do they have to be pieced together individually? Reading around, it seems there are two generations of timing setup for the M42, and some are commonly upgraded with later M44 parts? I got a little lost with what works / what doesnt.
Any help would be awesome, thanks!
Reading around, it seems M42 heads are prone to cracking and dumping coolant - this one didnt seem to use any coolant and was never overheated for the near decade my friend has had the car - were the later model heads changed to address the cracking issues?
I was planning to freshen up the timing drive while we are in there. The guides are in poor shape, the chain seems to have typical wear for its age. Are there timing kits available (guides, chain, tensioner) or do they have to be pieced together individually? Reading around, it seems there are two generations of timing setup for the M42, and some are commonly upgraded with later M44 parts? I got a little lost with what works / what doesnt.
Any help would be awesome, thanks!
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