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Massey Harris & Massey Ferguson Tractors Discussion Forum

MH 444 Diesel pistons in gas tractor?

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06-28-2020 18:36:50

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My 444 was left out in the rain and water got in the back two cylinders. The engine froze up so we had to tear the engine down to free it up. It is a gas engine we have been running it for around ten years. We'll it looks like they are diesel pistons. They have long skirts with three compression rings and two oil rings. I know that pistons are hard to find for this engine. Has anyone seen this done before? Looks like the pistons a still good so I will probably just hone the cylinders and use the same pistons.

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06-29-2020 08:06:48

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 Re: MH 444 Diesel pistons in gas tractor? in reply to montidale, 06-28-2020 18:36:50  
The extra lower ring will make the piston a bit more stable in the bore, but the extra ring robs a bit of power due to the friction of it. Some racecars, pulling tractors, etc that require a factory type replacement piston to keep cost of engines low engine builders will only use top compression ring, and 1 oil control ring in order to make more power because of less friction. But on race engine, pulling engines, etc long term reliability is not quite an issue like it is with the car, truck, tractor, etc you use everyday.

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06-29-2020 06:32:05

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 Re: MH 444 Diesel pistons in gas tractor? in reply to montidale, 06-28-2020 18:36:50  
Thanks for the reply. I wonder the reason diesel engines have an extra oil control ring on them? What would be the advantage of leaving the lower oil ring off the pistons? Looks like I can find rings for the pistons. The set I was looking at has a three piece oil control ring vs the one piece cast type ring that is on the pistons now. We don't run the tractor much, mostly brushhoging and a back blading. It's a little to big for our purposes. I'm thinking of getting a smaller sized tractor. Something that I can run a garden tiller and the brush hog. But that will be another tread. Thanks again

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06-29-2020 06:12:38

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 Re: MH 444 Diesel pistons in gas tractor? in reply to montidale, 06-28-2020 18:36:50  
I'm not sure how to send pic's without the kid's help. The p/n on the pistons is HD277A-402M.

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06-29-2020 03:21:09

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 Re: MH 444 Diesel pistons in gas tractor? in reply to montidale, 06-28-2020 18:36:50  
I'd leave the lower oil scraper ring off and use them, both diesel and gas pistons were flat top anyway. My MH 33 diesel has a good used gas 208 sleeve/piston set without the lower oil ring and runs fine.

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David G

06-28-2020 19:00:17

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 Re: MH 444 Diesel pistons in gas tractor? in reply to montidale, 06-28-2020 18:36:50  
Send pictures of the pistons.

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