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mhbier 
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Joined: 17 Feb 2015
Location: Montrose, co
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 Topic: d14 compression
Posted: 08 Feb 2024 at 3:21pm |
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I bought a used D14 and would like to know the normal compression. Presently it is 115, 100, 100, 115. Is the normal?
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DrAllis
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Posted: 08 Feb 2024 at 3:35pm |
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All compression tests need to be done with a battery charger on the battery, all spark plugs removed and the throttle WIDE OPEN. Looks a little low to me ( 135 psi new engine spec) but you're opening a can of worms to improve it. If it runs fine and doesn't smoke BLUE when warmed up, leave it alone.
Edited by DrAllis - 08 Feb 2024 at 4:03pm
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ACinSC
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Location: South Carolina
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Posted: 08 Feb 2024 at 4:01pm |
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Not sure if my gas D 15 is exactly the same , but my comp was around 140 PSI average when last I checked . Have had my head rebuilt . HTH
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DrAllis
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Posted: 08 Feb 2024 at 4:34pm |
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D-15 series 1 are 160 psi new engine spec.
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jaybmiller
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Posted: 08 Feb 2024 at 5:40pm |
According to the I&T manual, 135# at cranking speed. While 2&3 are a little lower than 1&4, it's probably just fine for a 70 year old... Meanwhile there's other things you can open your wallet for..... brakes, PTO O ring, 3rd gear, oil leaks, rear rubber,.......
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3 D-14s,A-C forklift, B-112
Kubota BX23S lil' TOOT( The Other Orange Tractor)
Never burn your bridges, unless you can walk on water
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Les Kerf
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Location: Idaho
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Posted: 08 Feb 2024 at 7:34pm |
 mhbier wrote:
I bought a used D14 and would like to know the normal compression. Presently it is 115, 100, 100, 115. Is the normal? |
I would need more reasons than that to justify tearing it down. As Dr. Allis said, excessive blue smoke AFTER fully warmed up, massive oil consumption, coolant loss, hard starting etc.
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mhbier
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Location: Montrose, co
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Posted: 09 Feb 2024 at 11:51am |
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Thanks for your responses re: my d14. I am waiting for my manual in the mail. The rubber appears to be almost new. The tin has some high-altitude sunburn but otherwise is in great shape. The front end is very firm and solid. It looks like it was cared for in its earlier life and been sitting outside for some time in its later life. But for $1700. it looks like a good project. I haven't had an opportunity to really work the transmission, but it appears good. The only question is the power director. It seems to go into low alright but doesn't want to stay in high range. Any suggestions?
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DrAllis
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Posted: 09 Feb 2024 at 11:55am |
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Start by removing the lever stop bolt for a test.
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mhbier
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Posted: 10 Feb 2024 at 10:32am |
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moving the lever stop bolt took care of the problem
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DrAllis
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Posted: 10 Feb 2024 at 1:50pm |
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Now, remove just enough flat washers to achieve the same thing. Technically, the stop bolt should be there.
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mhbier
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Posted: 10 Feb 2024 at 2:18pm |
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Thanks, I did just that
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