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Old 23-04-2015, 16:38   #1
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Compression Release Lever Stuck (Closed)

I changed the fuel filters on my Yanmar 2GM20F. Bled the system at the secondary filter (2 bolts) and at each of the fuel injectors (2). It's never run better! But I noticed during my bleed procedure that one of the 2 compression release levers is stuck in the closed (Run) position. (Strange, because I'd been using it minutes prior.) I sprayed some PB Blaster, but still stuck. I searched for clues online, but seems most people experience them stuck open (No Compression). Any ideas? Thanks!
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Old 23-04-2015, 19:14   #2
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Re: Compression Release Lever Stuck (Closed)

Turn it over.

I have seen levers stuck in closed position only to see them unlock once you turn the engine over.

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Old 23-04-2015, 20:56   #3
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Re: Compression Release Lever Stuck (Closed)

Thanks, but the engine does turn over - and it runs well. Compression release lever still stuck in Closed position.
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Old 24-04-2015, 04:56   #4
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Re: Compression Release Lever Stuck (Closed)

Just pull the rocker cover off and see why it is stuck…
Straight forward job.

BTW, welcome aboard
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Old 24-04-2015, 05:14   #5
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Re: Compression Release Lever Stuck (Closed)

I think the turn it over comment was it's possible for that cylinder to be in compression and since the decompression lever opens the exhaust valve, if that cylinder has pressure in it, that pressure could hold the valve closed, move the cylinder off the compression stroke and the lever may open. Too easy not to give it a try
PS, I've seen it happen too.
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Old 24-04-2015, 06:26   #6
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Re: Compression Release Lever Stuck (Closed)

Quote:
Originally Posted by Wotname View Post
Just pull the rocker cover off and see why it is stucků
Straight forward job.

BTW, welcome aboard

Like he said...
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Old 24-04-2015, 08:15   #7
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Re: Compression Release Lever Stuck (Closed)

Yep. If nothing then the cover off and look inside. It is just a lever and you should see why it refuses to co-op.

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Old 24-04-2015, 15:23   #8
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Re: Compression Release Lever Stuck (Closed)

Is this one of those bigger hammer jobs?

Just kidding of course. I remember throwing the lever too far on a Volvo and compression not releasing enough to spin the engine. I learned a lot on that emergency. I love those things. I wish all diesel engines had them.

Good luck on your repair.
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