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Mercruiser Mark iv oil temperature issue

Old 06-21-2022, 06:55 AM
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Originally Posted by JAbsher View Post
I agree. It does make sense to filter the hot oil and then send it to the cooler. Mine go through the cooler first then filter before returning to the block. They were rigged that way when I bought it. I think I’ll reroute my lines to your diagram when I reassemble them.
Make sure looking at the correct oil line leaving the block (remote oil adapter) Look at the diagram above. #5 hose #10/ 90 degree fitting is out
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Old 06-21-2022, 07:10 AM
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Originally Posted by 35fountain View Post
I would think you would want it to run from the block to the filter then to the cooler just to filter the cooler before returning to the block. JMO My 509 gen 4 is plumbed like that.
#5 in inlet

Block to cooler first would not protect it from debris
My hoses are routed exactly like this. My number 17 hose is my outlet and my number five hose is my return.
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Old 06-21-2022, 07:49 AM
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Originally Posted by JAbsher View Post
My hoses are routed exactly like this. My number 17 hose is my outlet and my number five hose is my return.
Something is incorrect then. If you have the same oil filter adapter #5 hose is the inlet of the filter. There is an arrow on the adapter. The arrow is facing towards the adapter and the other hose is the out. Follow #5 back and you will see it comes from the block remote adapter. The arrow on the oil filter is the flow so if you have it reversed you maybe not getting oil correctly


Last edited by 35fountain; 06-21-2022 at 07:53 AM.
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Old 06-21-2022, 06:27 PM
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Originally Posted by JAbsher View Post
My hoses are routed exactly like this. My number 17 hose is my outlet and my number five hose is my return.
The hose that goes from the block adapter see pic .it says (out) goes to oil filter in------- follow arrow then out of filter to cooler


Last edited by 35fountain; 06-21-2022 at 06:32 PM.
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Old 06-21-2022, 07:14 PM
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I just checked my hoses again. My oil flow path is correct as far as direction but it does go through the cooler before the filter. It must have been done this way from the factory because the hoses look to be original and my block exit hose is too short to move locations. My flow path: exits the block, enters cooler port side, exits cooler starboard, enters filter housing with arrow pointing towards center, returns to block adapter marked in.
The path works but it is filtering cooled oil.
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Old 06-21-2022, 07:24 PM
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I will be rerouting and installing new hoses when I reassemble. I plan to route to filter first and then cooler. Just makes more sense to me. I would think hot oil would flow better through the filter. New cams, lifters and springs were purchased today.
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Old 06-22-2022, 07:54 AM
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I would suggest replacing the oil cooler on the engine with the failed cam. There is no way of getting all of the fine metal particles out of it by cleaning.
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Old 06-22-2022, 08:49 AM
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Originally Posted by snapmorgan View Post
I would suggest replacing the oil cooler on the engine with the failed cam. There is no way of getting all of the fine metal particles out of it by cleaning.
I was afraid someone was going to mention that. Lol. Its a brand new oil cooler with less than one hour run time on it. I feel like I have to at least try to clean it. Im thinking about removing it and maybe trying to pump diesel fuel through the cooler oil passages under a small bit of pressure. Basically plumbing it to a transfer pump.
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Old 06-22-2022, 01:35 PM
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The worst that could happen is that you would have to pull the engine again, replace the bearings and polish the crank, probably replace some stuck lifters and so on. Makes an oil cooler look pretty inexpensive to me.
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Old 06-22-2022, 11:07 PM
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Bold move cotton
If you are going to reuse the cooler I would put it before the filter so all the junk gets trapped, don't forget to buy a filter without a bypass. Call the manufacturer and see if they can re core it. In the words of my father " the cheap man pays the most".
Good luck
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