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Reload this Page M18 Oil Pressure issue
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Old 09-24-2018, 07:39 PM
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ol'George ol'George is offline
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Join Date: Oct 2009
Location: MI
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Originally Posted by mobermiller View Post
Thanks ol'George for your insight to my problem.

I'll share some history that I have discovered as I have progressed with my investigation of what's going on.

First of all I bought this super as a 2072 from a person I have known for over 40 years. He told me it had the M20 engine in it and I had no reason to doubt him. 20 years ago he had bought an 1872 and shortly after he bought it, a screw that holds the air filter assembly to the elbow on the carburetor came loose and got sucked into the # 1 cylinder. This screw got embedded into the top of the piston. He took the head off and found the screw and removed it. As of last summer, he was still using this engine in that same 1872, according to him.

When I pulled the engine out of this 2072, I discovered it had an M18 in it. I really didn't think much about it because a previous owner could have switched hoods or replaced the engine. The engine ran good with no smoke and no knocking.

While the engine was out I removed the heads and guess what I found on top of the number 1 piston? A nice dent left by a screw!

Moral to the story, Even someone whom you may trust, will still put the screw to you!

The engine only has 75 psi of compression in each cylinder. Both pistons are loose in the cylinders. I'm convinced this engine is wore out and I'm just going to put it back together and use 40 or even 50 weight oil in it and run it till it runs no more. I will be looking for a command engine to put into my 72 series super this winter.

Thanks for the help!
If both cyl's have #75 it sounds like it has higher hours on it, and is prolly pushing a bit of oil in the air cleaner, but not slobbering.
It's been my experience #95 is normal.
Sounds like the "screw" didn't do a lot of damage or it would of long since died.
If you are comfortable with not rebuilding it go ahead and use it.
I'd run #30W oil and continue not abusing it, and it just might live a long time.
A little oil usage is to be expected, just keep it full and not neglected.
It is obviously getting oil, just loosing pressure because it is worn.
I like those engines as most here know.
They got an undeserved rap because of the series 1 predecessors.
Truth be told, they will and have run longer than some of the later OHV designs, under the same conditions.
They are smooth and torquey,
I doubt a person uses 20 hp in a super
Enjoy it.
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