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Old 08-09-2018, 13:51   #1
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Yanmar 3ym30f valve adjustment while installed

Hi folks, it has been a while since i adjusted valves on any engines, my yanmar needs to be checked, l'm looking for safe procedures to adjust ( and rotate crank) my valves while my engine is installed on my sailboat, any info will be appreciated ,



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Old 08-09-2018, 13:57   #2
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Yanmar 3ym30f valve adjustment while installed

I do it in conjunction with an injector cleaning, cause I don’t have a way to decompress the engine. Removal of the injectors of course won’t allow any compression.
Then I’ll use a plastic straw to determine TDC as my crankshaft timing marks are covered with a Serpentine belt kit.

But it’s easy find TDC of a cylinder using the straw as an indicator of piston placement and TDC is easy to determine because both valves are a little loose, if TDC exhaust, they won’t be.

Now if you have indirect injection this isn’t likely to work cause you can’t get to the piston tops.
If you use an indicator like a plastic straw, be sure to use something that can’t harm the piston, nor can be broken off.

Of course you can always download the engine manual and do it the right way, the procedure in the manual.
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Old 08-09-2018, 15:54   #3
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Re: Yanmar 3ym30f valve adjustment while installed

Don't get hung up on an actual clearance. Pick a feeler gauge to use as a Go/no go gauge.
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