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Old 08-12-2008, 16:25   #1
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Calling Pat...Yanmar 2gm20F

I have a 2gm20f with a curious problem....the aftmost pushrod is intermittent....could this be a stuck lifter? Or would you think it may be a sticking valve? It figures that it is one of the coldest days of the year here, I maybe be suffering from "brain-freeze"
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Old 09-12-2008, 21:41   #2
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HElllloooooooo!!!!!!!!!!!!!!!!!!
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Old 10-12-2008, 05:12   #3
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Sorry, I was working yesterday.

Can't be the lifter they are solid. What do you mean by intermittent?
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Old 10-12-2008, 07:33   #4
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Some times it pushed sometimes it didn't.

If I put some light downward pressure on the pushrod it pushes.

Since the lifters are solid do you think a bent or sticking valve could be the culprit?

What I am trying to do is eliminate the cam/lifter out of the equation.

You and I sound like the kind of wrenches that want to narrow down the problem before possibly a needless complete tear down of engines.

Let me know what you think....I am off to deliver a boat to Annapolis
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Old 10-12-2008, 08:09   #5
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wow...I'm at a loss
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Old 10-12-2008, 08:59   #6
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I would suggest you pull the push rod and check it, will the engine run at all, if so what is the rocker action
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Old 16-12-2008, 17:53   #7
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Just an update....Set the valves to proper clearance.....Did compression test......way low........did notice a hissing sound when slowly turning engine over (by hand)while tester was in aft cylinder........sound seemed to come from front hole.......Rigged up a leakdown adaptor.....with cyl #2 @TDC you could hear air from #1 cylinder.

I will pull the head tom or thurs......I figger it is valves.
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Old 16-12-2008, 19:09   #8
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how is air transferring between the cylinders?
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Old 16-12-2008, 19:23   #9
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Until I get it apart, I am thinking via the exhaust valve on #2 leaking and the sound from #1 is an open exhaust valve.

Does that sound plausible?

The sound does not emanate from the intake manifold side.

So what I am thinking is, since I am going to pull the head, when I disconnect the exhaust mainfold I will perform the test again to satisfy my curiosity.
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Old 16-12-2008, 20:00   #10
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it's plausible
can't wait to hear what you find.
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Old 16-12-2008, 20:15   #11
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Plausible/Busted/Confirmed........We sound like the Boat-Mythbusters HAR HAR HAR
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Old 23-12-2008, 12:44   #12
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Pulled the head yesterday...waiting for shp to tell me how the valves/valve seats look. Couldn't see any headgasket failure per se, but the head gasket seemed to be delaminated....
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