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Old 30-08-2024, 16:49   #16
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Re: Yanmar 4jh4 hte issues at low rev and oil vs rpm question

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Originally Posted by etoimene View Post
FYI, since I got notification from thread, one of my issues (dying in idle) was resolved with a new set of gaskets for the pump. Forgot to update earlier.
So might have been an air leak.

On the RPM issue, instrument died, so until we replace it, I'll just thank you for the advice.
Haha , thanks for the update, I guess after 3 years it’s been well and truly solved. Happy boating.
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Old 07-09-2024, 23:28   #17
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Re: Yanmar 4jh4 hte issues at low rev and oil vs rpm question

Update on dying issue - I checked and the guy said the pump was simply dirty inside.
Otherwise, all was top notch. He replaced o-rings, just in case (since it was open already).
There is racor pre-filter installed so seems a bit strange.
Luckily, it was just that ....

Still worknig on RPM issue. Seems I'll have to replace the instrument. We tested with another instrument and all works.
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Old 08-09-2024, 06:28   #18
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Re: Yanmar 4jh4 hte issues at low rev and oil vs rpm question

Sounds like my post #8
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