There haven't been very many problems with that engine. But...
we have replaced a few that decided to spit out the front bearing
shell on the balance shaft. This leads to a loss of oil pressure to
the cylinder heads and camshafts, and you get what sounds like
a lot of valve "lifter" noise. Of coure, these engines dont really
have "lifters", but it's the same basic concept.
Here is a picture of one that I recently had to replace.
The balance shaft grinds it's way into the aluminum block,
so you have no choice but to replace the entire engine.
Note: This may not be the problem. I haven't run into
many other problems on these engines noise wise. We have
had some issues with oil burning, and oil leaks...but that's about
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