I have not yet gotten this 1950 8n started. It has been sitting for 15 years. I put a little oil in each cylinder a few days ago just to lube the rings. With all the spark plugs out, I checked the compression. It came out as follows. 50/35/45/30 I this normal for a cold engine ? It seems low to me. Does it give me any useful information ?
- Thread starter Chuck123
- Start date
Bruce (VA)
Well-known Member
Dune Country
Well-known Member
ditto
Bruce (VA)
Well-known Member
Hobo,NC
Well-known Member
- Location
- Sanford, NC
With numbers that low it won't matter... I would use 2nd its gonna take a good spin to fire it up if it will fire off... I have pulled 2 vehicles off with success that would not start in my life time. One was a IHC truck and the other a JD 1010. The truck would start and run good after the pull I never did know why I had to pull it to get it running. The JD would not start on its own after the pull it ended up the valves were to tight. I have never had to pull start another non runner I knew were the compression loss was and went after it and fixed it.
Google cylinder leakage test.
billford8N
New User
Great point. May be able to lap the valve seats and come out good.
Bruce (VA)
Well-known Member
Minimum acceptable pressure is 90 lbs w/ the lowest pressure reading w/in 75% of the highest reading. Run the engine to operating temp, turn it off, remove all 4 plugs, remove the breather hose & make sure the choke and throttle are both open. Start w/ # 1, closest to the radiator. Crank it at least 5 compression strokes or until the gauge stops moving. Write down the first compression reading (that is the valves seating) then write down the reading after 5 strokes or when it stops increasing. You should have two numbers for each cylinder. Then, add a tablespoon of oil to each cylinder & repeat the process, but you only need the final reading for each cylinder. Write down the results & post back for help figuring out what it all means.
75 Tips
Similar threads
We sell tractor parts! We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today.
Copyright © 1997-2024 Yesterday's Tractor Co.
All Rights Reserved. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Trade Marks and Trade Names contained and used in this Website are those of others, and are used in this Website in a descriptive sense to refer to the products of others. Use of this Web site constitutes acceptance of our User Agreement and Privacy Policy TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V.
Yesterday's Tractors - Antique Tractor Headquarters
Website Accessibility Policy