Re: Engine prelubrication


Kevin wrote:
Seems to me using assembly pre--lube
would be the best way to go though. It's been years since I actually taught
engine overhaul and back then we would use assembly lube, then we would use
a pressure pre-lube right before cranking the engine. I did it that way
mostly to teach both methods though.
I find it hard to believe anyone would advocate not using assembly lube or
pre-lubing the engine before start up. And what would be the advantage?

It's been 25+ years since I went to automotive tech school, but they
were teaching back then that if you are going to be a tech just to
overhaul engines, you will soon be out of a job. I feel that the
instructors were correct, unless you are specialized or do it just on
your own vehicles. With that being said, this subject will have many
different views and probably none of them will be wrong or totally
right.
Here's my thoughts: Use assembly lube liberally. Don't use regular
grease because it is "stringy" and can plug up an oil pickup tube.
Assembly lube is not stringy. If you prelube, don't overdue it because
it can wash away your prelube and the prelube has a lot higher
stress/sheer factor than oil. Add a couple of squirts (just don't
overdue it here) of engine oil into the combustion chambers to lube the
compression ring on the initial start. Since most SM rated oils are now
low on zinc, add a couple ounces of "break-in" lube or use a diesel
rated oil on the initial oil fill. Keep the rpms higher than idle for
the first 20 minutes.
Do everything possible to get the engine to start immediately so that
very little cranking is needed. (If carbed engine, prime the carb
before cranking) 'Bout all I can think of. Arguments are welcome.

.

Relevant Pages

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