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AC Forklift with D15 engine
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jpi72 View Drop Down
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Joined: 27 Jul 2019
Location: Hudson, Iowa
Points: 42 		Post Options Post Options   Thanks (0) Thanks(0)   Quote jpi72 Quote  Post ReplyReply Direct Link To This Post Topic: AC Forklift with D15 engine
    Posted: 22 hours 60 minutes ago at 2:10pm
I own what I believe is an AC 610 forklift.  It has a D15 series II engine (160 cu. in.)  Was engine noted to have head problems?  The third cylinder lost the keepers on the exhaust valve.  We got the valve reattached and replaced with new keepers.  Then to find out the that same cylinder has zero compression.  After Christmas we will remove the head.  Does anyone have experience with this problem?
Joel
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SteveM C/IL View Drop Down
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Joined: 12 Sep 2009
Location: Shelbyville IL
Points: 8723 		Post Options Post Options   Thanks (0) Thanks(0)   Quote SteveM C/IL Quote  Post ReplyReply Direct Link To This Post Posted: 4 hours 41 minutes ago at 8:29am
If you dropped a valve I suspect you have a hole in a piston. How were you able to retrieve valve after loosing keepers?
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jpi72 View Drop Down
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Joined: 27 Jul 2019
Location: Hudson, Iowa
Points: 42 		Post Options Post Options   Thanks (0) Thanks(0)   Quote jpi72 Quote  Post ReplyReply Direct Link To This Post Posted: 2 hours 20 minutes ago at 10:50am
The valve must have been supported by part of the combustion chamber beside the piston.  I am fearful we have piston issues.  We will know more when we lift the head.

Joel
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Joined: 08 May 2020
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Points: 1483 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Les Kerf Quote  Post ReplyReply Direct Link To This Post Posted: 2 hours 13 minutes ago at 10:57am
Probably a hole in the piston or a bent/broken valve, maybe both; either way the head needs to off if you intend to fix it.

You could blow air in through the spark plug hole with the piston at TDC (firing position) and listen for where the air leaks out. This really won't prove much other than verifying that you have a problem, which you already know Ouch
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