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Go Back   SailNet Community > On Board > Gear & Maintenance > Engines > Diesel
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  #1  
Old 07-27-2013
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M25xp

Need to see if I can get some advice. I have a Catalina 30 with a M25XP and I've started having some overheating issues. The heat exchanger has been gone through last season, the raw water pump and hoses were replaced last season. I'm finding antifreeze in the bilge and can't locate a leak. Also the boat has started heating up quickly, around 5 minutes to 160-170 degrees. The temp guage is reading as high as 210 even though a handheld laser thermometer only reads around 170 at the thermostat housing. I've replaced the thermostat as well. Today I disconnected the hose on top of the fresh water pump and the one feeding back into the thermostat housing and started the engine. I let it run for about 5 minutes and never had any antifreeze coming from the hose leaving the top of the fresh water pump. Does this sound like a problem with the fresh water pump?
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Old 07-27-2013
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Re: M25xp

Check compression, I would guess head gasket. But an air bubble in the system is a possibility, bleed the air and "Burp" the coolant system and try again. Your raw water and coolant should never mix, they are separate systems. I am guessing that the coolant in the bilge came from an overheating overflow condition. As a short term test, remove your thermostat and see if it still overheats or heats up quickly if not your problem might be the stat. External heat on the engine can be a bit misleading so still you need to make sure your gauge is accurate.
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Old 07-28-2013
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Re: M25xp

Hello,

You need to carefully check the engine water pump (not the raw water pump). There is a weep hole located on the underside of the pump. Make sure no coolant is leaking. If it is, you need a new pump (or get your pump rebuilt).

One other thing is your thermostat might be bad. Sometimes a new stat is bad as well. For a simple test just remove the thermostat and run the engine. If you don't get the overheating then the thermostat is the problem. If that is true then buy a new stat and try that, I would not run the engine for long without a thermostat.

Good luck,
Barry
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Old 07-30-2013
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Re: M25xp

Thanks for all the advice. After a little more research I think it is the head gasket. Planning on taking the head off this weekend.

Thanks again.
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