Farm Equipment - Air Cleaner for a G

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Air Cleaner for a G

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Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=45761
Printed Date: 08 Sep 2025 at 1:51pm
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Topic: Air Cleaner for a G

Posted By: John Kenny
Subject: Air Cleaner for a G
Date Posted: 17 Feb 2012 at 5:53pm

Couple questions about air cleaner on the G:

First of all my oil cup has no marker as to how much oil to put in, can anybody give me a specific volume? Or relatively even? There are the three holes in the inner cup that allow oil to spill into the rest of the cup, I have it topped off above them.

Problem: Oil seems to be getting sucked back up the air cleaner sleeve and leaking out of the air intake... What causes this? Is it low or high oil level in the cup? Poor pressure?

Replies:

Posted By: Warren(Oh)
Date Posted: 17 Feb 2012 at 6:07pm

Manual says 1/2 pint oil in the cup. No specific weight.

Posted By: CTuckerNWIL
Date Posted: 17 Feb 2012 at 6:14pm

1/2 pint capacity. Is oil coming out the top center of the air cleaner? If so, I would think you have Leaking intake valves, letting compression blow back through. Not sure how it would run very good that way. The only other thing would be backfire from timing issues, which you would be aware of if it happens.

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http://www.ae-ta.com" rel="nofollow - http://www.ae-ta.com
Lena 1935 WC12xxx, Willie 1951 CA6xx Dad bought new, 1954WD45 PS, 1960 D17 NF

Posted By: CTuckerNWIL
Date Posted: 17 Feb 2012 at 6:16pm

Warren, most say whatever you use in the engine. I have seen air cleaners that say right on them to add USED MOTOR OIL .

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http://www.ae-ta.com" rel="nofollow - http://www.ae-ta.com
Lena 1935 WC12xxx, Willie 1951 CA6xx Dad bought new, 1954WD45 PS, 1960 D17 NF

Posted By: Dusty MI
Date Posted: 17 Feb 2012 at 6:19pm

If your saying oil is coming out the top/air inlet of the air cleaner, I think you will find that you have a leaking intake valve. My D-10 was doing that, I had the head rebuilt/valves ground. It no longer blows oil out the air cleaner.

Dusty

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917 H, '48 G, '65 D-10 series III "Allis Express"

Posted By: John Kenny
Date Posted: 19 Feb 2012 at 1:51pm

Thanks for the feedback. Timing has been (or so I've thought) an issue with this tractor and I have been working on getting it sorted. Based on what your saying I am going to hope that the timing is the problem and not the valves, but based on my experience with timing this thing I fear the worst. Thanks again. JK

Posted By: Dusty MI
Date Posted: 20 Feb 2012 at 7:20am

A couple of test you can try.

With the engine running remove a spark plug one at a time. See if you can hear a difference from one cylinder to another.

With the spark plugs in, crank it over by hand and listen closely as each cylinder comes to the top. You might be able to hear air blowing back threw the air intake.

Do a compression test.

Dusty

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917 H, '48 G, '65 D-10 series III "Allis Express"