I started working on my 1989 GMC Safari to repair a coolant leak from
the water pump interface to the block. Saw that the original
crankshaft oil seal was leaking a good bit so I removed the timing
cover. On the tension side the chain is pretty tight, but on the
nontension side, I can wiggle about 3/8" of slack. The teeth of the
sprockets look pretty good but the van has 165K miles. Is there a
tolerance on chain slack? My Haynes/Chilton doesn't call one out.
If it has the link belt type chain and sprockets with the plastic
on the links to make it quiet I think I would get a kit with new
chain and sprockets.
Those engines are really a 350 with the front two cylinders
removed and it probably uses the timing set from one, which
should make a set fairly reasonable in cost.
And easy to change as you are looking at it.
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