Even a 1000 rpm could be a little higher than ideal. It is
hard to say what causes problems sometimes. There are
manufacturing defects, there is a possibility that an oil
passage is partially plugged. Sometimes the mechanic who
assembled the engine can have missed getting assembly lube
on the cam or journal. If it is on a cam and or lifter,
even valve spring tension will effect the load on the wear
surfaces.

Best you can do is follow the engine manufacturer's
recommendations about starting and shutdown, oil changes,
etc and save money for the unexpected work.


--
James H. Macklin
ATP,CFI,A&P

--
The people think the Constitution protects their rights;
But government sees it as an obstacle to be overcome.
some support
http://www.usdoj.gov/olc/secondamendment2.htm
See http://www.fija.org/ more about your rights and duties.


"Ray Andraka" wrote in message
news:mQ2wf.41528$Mi5.36676@dukeread07...
| Jim Macklin wrote:
|
| Start with the throttle 1/2 open, zero rpm to 1800 with
no
| oil pressure. Etc.
|
|
|
| No, I don't start mine like that. On shut down, I set the
throttle for
| 1000 RPM and lock it. The throttle doesn't move again
until the engine
| is warmed up. I preheat religiously below 30F, and I
don't leave the
| preheater plugged in.
|
| Also, if it were corrosion that got mine, why only one cam
lobe?? My
| mechanic tells me there have been a rash of problems with
newer cams
| with flaws in the case hardening. I haven't seen evidence
to prove it
| though.