The timing chain turns the camshaft so what you are looking for is the
proper valve timing. You can measure this by visually noting where an
intake valve starts to open and then looking at how many degrees BTDC this
happens. The proper way to do this is with a dial indicator and a degree
wheel but you could use a .001 feeler gauge and the timing marks on the
crank pulley. With a stock cam, the intake on a 1600 begins to open at 20
degrees BTDC. If the chain "jumps", it will open later that this figure -
Maybe 5-10 degrees BTDC instead. You would also notice if this happened
with a car that was working normally, that your spark timing would also be
suddenly retarded. Either way it would run poorly all of a sudden.
One other thing to note is that if you had just assembled an engine and
thought that you properly timed your cam, you may not have a stock cam. I
made that assumption on my brothers car a few years back and discovered that
his cam was not stock and actually had different intake and exhaust
durations. You need a degree wheel to figure that one out.
I've never personally seen a timing chain jump a tooth. They usually just
break. If that happened, you'd know it
Brian
-----Original Message-----
From: owner-datsun-roadsters@autox.team.net
[mailto:owner-datsun-roadsters@autox.team.net]On Behalf Of Donald
Swenson
Sent: Friday, April 27, 2001 3:20 PM
To: datsun-roadsters@autox.team.net
Subject: timing chain
Hello everone i'm new to the list.I like to new knew if there is a way
to check if the timing chain jumped without taking the timing chain
cover off.1968 1600
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