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Old 09-08-2012, 15:03   #1
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Yanmar 3GM30 Valve Clearance

I have a Yanmar 3GM30FC and need the valve clearances.
Forums say 0.2 +/- 0.03 and 0.2 +/-0.08, which is right?
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Old 09-08-2012, 17:15   #2
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Re: Yanmar 3GM30 valve clearance

G'day,
3GM30FC valve clearance as per official Yanmar manual both inlet & exh cold 0.2mm or 0.079in [ 8thou ].
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Old 10-08-2012, 06:49   #3
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Re: Yanmar 3GM30 valve clearance

Thanks, 0.2 mm. is there a + / - leeway on this?
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Old 10-08-2012, 17:41   #4
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Re: Yanmar 3GM30 valve clearance

Set them so you can feel drag on you gauge this is close enough it is SUPER critical every techs feel is different.
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Old 15-08-2012, 20:59   #5
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Re: Yanmar 3GM30 Valve Clearance

Hold the adjust nut while you tighten the lock nut with the feeler gauge in place. After tightening lock nut there should be slight drag felt while pulling the feeler gauge out. Too tight - repeat. Too loose - repeat.

Dougs right - everyone's feel is different but it isn't "that" critical. You should feel the gauge drag, though.
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Old 15-08-2012, 21:24   #6
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Re: Yanmar 3GM30 Valve Clearance

Do they change much?
The drag should only be light i.e. you should be able to slide the gauge easily with two fingers.
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