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Old 08-05-2016, 14:08   #1
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Yanmar decompression levers

I'm having a no start issue with my 3gm.
I flipped the 3 decompression levers and turned it over... But unless I hold the #2 decompression lever with my hand, the motor flips it by itself.

What is this a sign of?


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Old 08-05-2016, 20:45   #2
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Re: Yanmar decompression levers

Design.
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Old 09-05-2016, 03:31   #3
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Re: Yanmar decompression levers

Quote:
Originally Posted by shakey doug View Post
Design.

It never did this before though.


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Old 09-05-2016, 08:31   #4
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Re: Yanmar decompression levers

I seem to recall that there is some adjustments to the levers, from a book. Never tried it. But will investigate further as one of my levers always hops around.
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Old 09-05-2016, 13:56   #5
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Re: Yanmar decompression levers

I posted this thread a few days back.
Yanmar De-Compression Levers
On my 3GMD the decompression levers have no adjustment. There is a detent ball that keeps the lever in place. The detent ball is just a small metal ball bearing held against an indentation in the decompression lever rod shaft that holds it in place. The spring or indentation in the rod may be worn and does not hold they lever hard enough thus it "pops" out. When in decompress the lever does not push the exhaust valve down as far as the push rod- thus the vibration. If the decompression lever held the exhaust valve down its full stroke, the piston would strike it at its Top Dead Center and do piston/valve damage.
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