"Ralph" wrote in message ...
On 4/8/2013 6:43 AM, Stormin Mormon wrote:
I've worked on lawn mowers, that failed when warm. That's one concern.

Another, oddlly enough, is motor oil gone bad. Many years ago, some engines
didn't run on cheap oil. Change the oil, and use a good brand like Penzoil
or Castrol. A couple vehicles ago, Castrol was the only brand that quieted
the piston rod knock for more than a couple days.
.
Christopher A. Young
Learn more about Jesus
www.lds.org
.
.
"PrecisionmachinisT" wrote in message
...

Check to make sure you have valve clearance when the engine is warm.



With a solid valve train, when the poppet valve wears, it starts seating deeper and deeper up into the head...eventually, thermal growth of the pushrods causes there to be no valve lash whatsoever, result being a loss of compression at the affected cylinder(s) but only when the engine is fully warmed.

--continued running under this condition will rapidly cause both the valve and seat to burn.

Easy rudimentary check is warm it up then remove valve cover and make sure you can at least spin the pushrods by hand when the piston are at TDC of ignition stroke.