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Old 03-18-2018, 09:16 AM
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Default Oil thermostat
I'm trying to locate the oil thermostat on my 500 EFI's. I see the oil cooler but I can't see anywhere that there would be a thermostat. Can anyone help direct me? Thanks.
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Old 03-18-2018, 11:54 AM
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Isn't it in your oil filter mount on the back of the engine?
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Old 03-18-2018, 12:20 PM
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MerCruiser Race Engine & Drive 500 EFI Oil Cooler & Oil Filter (Engine) Parts

here easiest way for reference in the link above.

number 13 is the oil t stat and how the whole assembly is installed 12 thru 18
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Old 03-18-2018, 03:00 PM
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Thanks. I can see the cooler but not the housing. Guess it must be buried somewhere back there. Probably have to try to follow the hoses to find it.
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Old 03-18-2018, 04:00 PM
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It’s in the adapter that goes to the oil filter pad on the block.
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Old 03-20-2018, 04:01 PM
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Originally Posted by Unlimited jd
It’s in the adapter that goes to the oil filter pad on the block.
The filters are remotely mounted on the front of the motors. There's nothing on the mounts except an oil temp sensor.
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Old 03-20-2018, 08:46 PM
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Double post
Last edited by Rookie; 03-20-2018 at 08:51 PM.
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Old 03-20-2018, 09:11 PM
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Originally Posted by splashandburn
The filters are remotely mounted on the front of the motors. There's nothing on the mounts except an oil temp sensor.
take a better look. There’s an adapter where the filter would go if it was on the block. The thermostat is in there.
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Old 03-21-2018, 08:21 PM
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You find yet. This is a hp 500.
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