Another victory for MMO! Revived a seized motor - - The Friendliest Tractor Forum and Best Place for Tractor Information
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post #1 of 7 Old 08-30-2012, 11:25 AM Thread Starter
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Another victory for MMO! Revived a seized motor

So I get this email from my neighbor...

Hey Ben-
I have a new Toro, emphasis on new. Yes, I finally replaced my 14 year old craftsman mower. Unfortunately I was away when the new mower was purchased and my oldest didnít put enough oil in the engine so it burned out the first time it was used. Sadly the toro repair said there wasnít anything to do as a new engine would cost as much as a new mower. Costly lesson for my son to learn about having enough oil in an engine. Would you like the mower for your parts repair? If so, let me know when you will be around and I will drop it off. Thanks.


he dropped off the mower yesterday and it was indeed seized up. I decided to overfill the crankcase and combustion chamber with MMO and then let it sit for an hour while i had supper. I drained the MMO (too expensive to dump) into the back into its jug. I put the normal 19.5 oz of HD30 oil in then I turned the mower on its side then slowly turned the blade back and forth. The dang motor was now "unseized"! It started right up. To really test it, I let it run for 30 minutes with no issues.

MMO is just awesome. I decided not to be a hog so I emailed the owner telling him it is fixed and he can pick it up.


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post #2 of 7 Old 08-30-2012, 12:13 PM
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Re: Another victory for MMO! Revived a seized motor

It wont live very long...but it might last a few cuttings.

When something seizes, by definition there is galling or metal to metal contact, when this happens the softer metal will smear or transfer to the harder metal. I nthe case of the bottom end, the aluminum rod transfers to the hard crank. In the top end..the aluminum cylinder transfers to the chrome plated piston and rings.

While it may still function, odds are good that major damage has been done, and it will have a much much shorter life span.

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post #3 of 7 Old 09-03-2012, 12:55 PM
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Re: Another victory for MMO! Revived a seized motor

what is MMO?
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post #4 of 7 Old 09-03-2012, 01:06 PM
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Re: Another victory for MMO! Revived a seized motor

Originally Posted by Cohiba54 View Post
what is MMO?
MMO = Marvel Mystery Oil

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post #5 of 7 Old 09-03-2012, 09:29 PM
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Re: Another victory for MMO! Revived a seized motor

I did something similar (seized by over-speeding) with an old Tecumseh. Freed it by hand with MMO, then had a major breakdown (rod, I assume), the very next time I used it (this was on a tiller).

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post #6 of 7 Old 09-03-2012, 10:24 PM
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Re: Another victory for MMO! Revived a seized motor

MMO is a good product. My neighbor has a 1968 ford backhoe with a 3 cyl gas engine that was seized due to water getting in the head. My dad fixed it for him by soaking the cylinders with MMO and cranking it slowly by hand. I agree though, seizing from rust is one thing, but once an engine seizes from lack of oil it's pretty much done.

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post #7 of 7 Old 09-05-2012, 02:50 AM
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Re: Another victory for MMO! Revived a seized motor

I have a still running 1979 briggs 11 hp that had the top bearing seize due to lack of oil. That was about 16 years ago. On the other hand I got another 28 series seized from no oil with some rod to crank transfer. When cleaning it up I noticed a tiny tiny crack in the rod. Replaced it and got a summer of heavy cutting from it. Haven't used it much this summer. I expect that had I left the original rod in it then it would have blown.
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