Farm Equipment - WC compression test.

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WC compression test.

Printed From: Unofficial Allis
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=173359
Printed Date: 30 Jul 2025 at 11:02am
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Topic: WC compression test.

Posted By: Beinepw#69
Subject: WC compression test.
Date Posted: 06 Aug 2020 at 9:00am

How do I do an engine compression test on a WC that has only a hand crank an no electrical system?

Replies:

Posted By: Acdiesel
Date Posted: 06 Aug 2020 at 10:47am

make sure you have a compression tester that threads into the spark plug hole.

if you pull all four plugs, have the throttle wide open and give it a few good hard pulls with the hand crank that is one way.

Or you could pull one plug at a time and just start the engine and check them all that way.

Dan

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D19 Diesel,D17 Diesel SER.3
2-D14, 2-D15 SER.II WF/NF
D15 SER.2 DIESEL
D12 SER.I, D10 Ser.II
2-720'S D21 Ser. II

Gmc,caterpillar
I'm a pharmacist (farm assist) with a PHD (post hole digger)

Posted By: Rusty Allis
Date Posted: 06 Aug 2020 at 11:29am

I think I would drag it around the yard in 2nd or 3rd gear with the compression tester screwed into it

Posted By: Boss Man
Date Posted: 06 Aug 2020 at 3:44pm

could belt it to another tractor

Posted By: DrAllis
Date Posted: 06 Aug 2020 at 6:40pm

All spark plugs removed. Throttle wide open. Pull it in 4th gear so the tester pumps at least 10 times. Switch to the next cylinder.

Posted By: TramwayGuy
Date Posted: 06 Aug 2020 at 9:15pm

Most compression testers have a check valve to hold the highest pressure achieved.