Compression for D17 IV Gas?
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URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=14527
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Topic: Compression for D17 IV Gas?
Posted By: Steve Stanley
Subject: Compression for D17 IV Gas?
Date Posted: 30 Jun 2010 at 12:46am
1965 D17 Series IV, gas. Can't find info on what its' compression should be - 150-ish? They're getting almost 120 psi readings now but was told it should be 170-ish. Thanks.
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7020, D17-IV gas, D21-I, white top rotobaler, Oxnard blade
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Replies:
Posted By: Burgie
Date Posted: 30 Jun 2010 at 4:55am
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My book says 145.
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"Burgie"
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Posted By: DonDittmar
Date Posted: 30 Jun 2010 at 6:16am
One thin about compression checks is they should all be even. If they were all say 70lbs, you would have a worn out engine, but probably no major mechanical issues, just wear. Its when 3 are at 145 and one is at 30, thats when you start to worry
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Experience is a fancy name for past mistakes. "Great moments are born from great opportunity"
1968 D15D,1962 D19D
Also 1965 Cub Loboy and 1958 JD 720 Diesel Pony Start
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Posted By: mlpankey
Date Posted: 30 Jun 2010 at 6:27am
For good pulling torque I like to see them over 300 psi. I think your close for stock though.
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people if they don't already know it you can't tell them. quote yogi berra
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Posted By: Brian Jasper co. Ia
Date Posted: 30 Jun 2010 at 7:26am
Steve, you can get an idea where any losses are with some oil. Sounds like you took a "dry" compression reading getting about 120psi. Now shoot about a table spoon of motor oil in each cylinder and do it again. If you see a noticeable spike in pressures, the pistons, rings, and sleeves are worn. Little if any change, valves are leaking.
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"Any man who thinks he can be happy and prosperous by letting the government take care of him better take a closer look at the American Indian." Henry Ford
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