Head Gasket?

emt3992 · Mar 23, 2019

I had suspicions of needing a head gasket with the tractor smoking a lot, tho more black than white smoke. While working on the power steering today I took a break and decided to pull the oil drain plug and see the condition of the oil. Not a real big shock but it was almost as thin as water. I right away thought well time for a head gasket. But... there?s a very strong odor of gasoline, not coolant.. still a head gasket??

emt3992 · Mar 23, 2019

I should add.. the oil is watery and dark black. I would think if it were a head gasket the oil would be tan or milky. I?m kinda leaning towards a carb issue or stuck float. ?? (yes I?m secretly praying I don?t need to do a head gasket, this yr at least)

SVcummins · Mar 23, 2019

Fuel transfer pump or carburetor float letting the crankcase fill with gas . Not likely a head gasket issue

Jim.ME · Mar 24, 2019

Help folks out - what is it for a tractor? Answers may well be different for different units.

emt3992 · Mar 24, 2019

Crap sorry it?s a 1954 John Deere 70

ET · Mar 24, 2019

The diaphragms in the fuel shut off on the sediment bowel are leaking.

Brownie450 · Mar 24, 2019

ET is right with the oil powered fuel shut-off
diaphragms leaking.
Deere still can furnish them [4 years ago].

The diaphragms leak into the oil line & down
into the crankcase.
Jim

emt3992 · Mar 24, 2019

Makes sense... where are they located? At first I thought someone meant between the tank and the sediment bowl, sounds like on a line? Any direction would help. I have the schematic on Deere?s website.

Dan in Ohio · Mar 24, 2019

Agree automatic fuel shut off leaking. Some words of wisdom (not mine) to guide you.

Automatic fuel shutoff

My JD 520 was acting-up and found that a stuck float/ float valve....no gas getting into Carb. With the drain plug removed from the CARB. there was no gas in the CARB. There was however gas getting to the CARB. as gasoline was flowing from the auto. shut off until the AUTO shut off was drained. The neighbours 620 had a problem so I used the below rebuild PROCEDURE from the "MACHINERY MAN"
You need to put all the diaphragms in place and really slightly tighten all the screws...then push the plunger down... after loosing the top locking screw...with this held down then evenly tighten all the screws...this relaxes the diaphragm and keeps it from stretching too much and tearing up after installation...most people don't put these in correctly ....same principal we used in putting diaphragms in the fuel pumps...there's a technique Procedure was originally posted by the MACHINERY MAN
Thanks MACHINERY MAN
Bob.......

Have had success using these instructions, hope you do too.

Mark-Ia · Mar 24, 2019

www.greenpartsofva.com/ Get your fuel shutoff diaphragms from George. They are alcohol resistant. He also has many other reproduced parts for your 2-cylinder.

Head Gasket?

emt3992

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emt3992

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SVcummins

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Jim.ME

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emt3992

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ET

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Brownie450

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emt3992

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Dan in Ohio

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Mark-Ia

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