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oil from breather cap

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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=3840
Printed Date: 27 Dec 2024 at 6:33pm
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Topic: oil from breather cap

Posted By: amosfl
Subject: oil from breather cap
Date Posted: 17 Nov 2009 at 5:33pm

I have a 1954 Allis Chalmers B and oil is coming from the breather cap onto the hood. What causes this and what can be done? Thanks Amosfl

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amosfl

Replies:

Posted By: DiyDave
Date Posted: 17 Nov 2009 at 5:42pm

Likely that you have a compression problem, either worn or stuck piston rings, or valve guides and seals are loose. Other problems more or less severe might also play into it. Welcome to the site!

Posted By: Coke-in-MN
Date Posted: 17 Nov 2009 at 6:02pm

Compression test to see if all cylinders are within 20% of each other , leak down test with compressed air into cylinder and listen to where it comes out .. Intake or breather.

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Posted By: Rick of HopeIN
Date Posted: 17 Nov 2009 at 6:20pm

i am no expert but not a lot of excess oil in them little motors so i would worry there is plug missing and somewhere else is getting less oil than it needs. Maybe a simple as junk built up in the head passages that drain back to block. You should pull that cover and have a look they are darn simple little motors.

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Posted By: Dick L
Date Posted: 17 Nov 2009 at 6:33pm

Called blow by. Pressure in the crankcase that vents out where it is designed to vent thru the breather. As the volume of air venting increases more of the oil mist created by moving parts in the crancase clings to the breather cap and changes from mist to drops which gets blown down onto the hood. When the engine is running you can remove the breather cap and place the palm of your hand over the pipe and get an idea of the amount of pressure and volume of air (blow by) being created from the compression passing by the rings into the crankcase.

It will be mostly a ring problem because if the valves are leaking that bad you will have a problem with making it run at all.

I have seen that kind of blow by on what was called a fresh overhaul where the head had been sent out and new rings and bearings had been installed. The blow by was caused from installing standard rings on old pistons in old sleeves without ever checking ring gap. When ask about the ring gap the answer was what is ring gap?