Farm Equipment - Tractor w/no compression after sitting many years

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Tractor w/no compression after sitting many years

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=154187
Printed Date: 06 Nov 2025 at 2:03am
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Topic: Tractor w/no compression after sitting many years

Posted By: nowaktj
Subject: Tractor w/no compression after sitting many years
Date Posted: 22 Sep 2018 at 11:01am

Any advice guys on what to do... it is a Farmall F20. Do I put a couple pumps of engine oil in the spark plug holes?

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D19D, D17D, WD, WC, Snobee, #83 Plow, SC Blade, 14' disk, 400 series planter, B , Terra Tiger, M Dozer w/Baker Blade, TL-12, 42S Grader, G

Replies:

Posted By: Phil48ACWC
Date Posted: 22 Sep 2018 at 11:13am

Shoot about 6-8 shots of auto trans fluid in each spark plug hole. Valves may be stuck. Remove valve cover and spray valve stems through the valve spring coils with PB Blaster or your favorite penetrating oil to get valves moving. Leave plugs out and turn engine over by hand and watch that all valves move full travel. Spray with more PB Blaster and repeat.

Once you get it running set valve clearances at .014" Hot.