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Massey Harris & Massey Ferguson Tractors Discussion Forum

gas in oil

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Ralf from MI

05-27-2007 16:09:48

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The oil in my MH 33 is over full, gas is some how getting into the oil. Has anyone else run into this or know what is causing this and how to correct it. Also it is not coolant have checked that out, Thanks

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Briar Creek Stables

05-29-2007 12:20:02

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Re: gas in oil in reply to Ralf from MI, 05-27-2007 16:09:48

Suity plugs...Sounds like a good tune up would solve your issues. The nice thing about an updraft carb is that a bad float will not fill your cylinders with gas. The excess gas usually runs out the air intake port (air filter tube).

I would dare say that if your tractor is not missfiring and doesn't burn oil, you're probably not looking at a compression issue. It sounds to me like a good tune up and a little carb adjustment will solve your problem.

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Rick Karro

05-28-2007 19:45:24

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Re: gas in oil in reply to Ralf from MI, 05-27-2007 16:09:48

I really don�t know anything about the configuration of a 33, but my MH 30 tractor has a gas tank that is higher than the intake manifold and the up-draft carburetor float valve sticks. If I do not shut the gas at the valve on the glass bowl, when it is not running, it fills the carburetor, intake manifold, and ultimately the crank through the pistons being filled.

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waclar

05-28-2007 19:23:17

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Re: gas in oil in reply to Ralf from MI, 05-27-2007 16:09:48

I bought a 44 Special from a dealer had it hauled to N.C. When it arrived it would barely run. Previous owner that traded it in said it was running great when he let go of it. Found that the spark plugs wires had been crossed and the plugs were incorrect for a 44. When I put the correct plugs in it ran like a top. Also adjusted the carb. While it was running rough it seems unburnt fuel was getting in the oil. I would check to see if it is running too rich to start with. Try to lean it out as much as possible to see if that helps.

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Ralf from MI

05-28-2007 18:54:24

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Re: gas in oil in reply to Ralf from MI, 05-27-2007 16:09:48

Pulled the plugs and they were all four sooty, going to get some hotter plugs and readjust the carb.The engine is a strong runner and starts hot or cold on the first or second roll. I'll check the comp. even though it does not use oil, thanks for the help and ideas

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Runnin Red

05-28-2007 17:17:51

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Re: gas in oil in reply to Ralf from MI, 05-27-2007 16:09:48

A 33 gas has a gravity fed fuel system, an updraft carb and a long intake manifold, all uphill. Go with the weak engine theory.

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Briar Creek Stables

05-28-2007 16:16:44

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Re: gas in oil in reply to Ralf from MI, 05-27-2007 16:09:48

First thing I would do is pull some plugs and do a compression test. Gas does not ignite very well in the cylinder if the compression isn't high enough. Check for spark while your at it. If you have good spark, and poor compression your problem is more than likely an intake valve that is not seating properly or you need a set of rings.

I have an 8n that had the same issue and I ended up replacing the rings. The compression was way to low on the number 2 cylinder and all it was doing is pumping the gas from that cylinder into the crank case. The unburnt fuel has to go somewhere, and the easiest exit is to go down around the wore out rings

If you do not have the means to do a compression test...pull the oil dipstick when it is running..If oil shoots or spits out the dipstick tube you're getting loads of blow-by. This isn't the most accurate test and only really works in the more severe cases.

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Ralf from MI

05-28-2007 04:51:58

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Re: gas in oil in reply to Ralf from MI, 05-27-2007 16:09:48

This is an up draft carb, thats what got me puzzled over the gas in oil. thanks for the replie hope someone out there knows the answer.

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marlowe

05-28-2007 13:42:14

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Re: gas in oil in reply to Ralf from MI , 05-28-2007 04:51:58

with the up draft carb and long intake manafold it seams hard for gas to get in the oil. dose it start after setting or is it flooded.

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Danthemasseyman

05-27-2007 20:30:14

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Re: gas in oil in reply to Ralf from MI, 05-27-2007 16:09:48

I had this happen to me on an MF Super 90 Diesel.....the diaphragm split inside the fuel pump and slowly leaked diesel fuel into the engine oil. Of course you don"t notice anything, until you realize the oil level starts to get up over full, and you never added any. Hope this helps ya out!

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Jerry/MT

05-27-2007 16:55:36

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Re: gas in oil in reply to Ralf from MI, 05-27-2007 16:09:48

Does your tractor have a cam driven fuel pump? Sometimes the diaphragmsbreak and leak fuel into the oil

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