Mercruiser Closed Cooling System Problems

Mercruiser Closed Cooling System Problems. This is a common occurrence on the. Half loop closed cooling systems half loop closed cooling systems use an ethylene glycol mixture to cool the engine block.

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1997 2859, 7.4 mpi, bravo ii. Overheating is a problem which can be diagnosed through a process of elimination. Typical (7.4l/454 in tthis case) raw water cooled:

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86 3.7 mercruiser with closed cooling system. Now my problem is after i filled the cooling system with coolant, coolant starter dripping out of the lower unit (from the water pick up im.

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Also has a closed cooling system. What i don't know is to what extent closed cooling prevents those problems, or if closed cooling presents a separate set of problems.

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What i don't know is to what extent closed cooling prevents those problems, or if closed cooling presents a separate set of problems. And a blown head gasket will manifest itself with bubbles in the heat exchanger, much easier to see than with raw water cooling.

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Mercruiser cooling problem if your water system can't supply the volume necessary , i've seem the merc pumps collapse a garden hose and almost totally shut it off. Any good fresh water cooling system should have excess cooling capacity.

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Not rumming a 50/50 antifreeze/water mixture will cause severe corrosion in the engine do to dissimilar metals, ruining the engine. It can also be from a more serious reason such as a bad water pump or clogged exhaust castings.

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Oil, power steering and transmission coolers (as applicable) heat exchanger (sea water side closed cooled engines only) cool fuel (efi engines only) sea water pump (some engines) manifolds (if they are sea water cooled) disconnect the hose from the seawater pump to the heat exchanger and connect a piece of hose (usually 1 ¼ inch id) to the. It is reliable and usually the annual maintenance performed during winter layup will prevent overheating problems.

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It is reliable and usually the annual maintenance performed during winter layup will prevent overheating problems. This is a common occurrence on the.

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Leaking seawater pumps are one of the first most common issues that may arise with any mercruiser model. I have a 2007 mercruiser 496 8.1 with bravo 3 and has 130 hours.

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1997 2859, 7.4 mpi, bravo ii. Seawater cooling systems are sometimes called raw water cooling or standard cooling, while closed cooling systems are sometimes called fresh water cooling.

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New water distribution housing 9. Took it to the dealer for a scan and they said it was temp related.

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And a blown head gasket will manifest itself with bubbles in the heat exchanger, much easier to see than with raw water cooling. Removed the closed fresh water cooling system (now cools off salt water) 7.

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I have a 1989 mercruiser 3.7 it seems to me that the closed cooling system is over flowing to the overflow tank, but is not returning to the cooling system. Not rumming a 50/50 antifreeze/water mixture will cause severe corrosion in the engine do to dissimilar metals, ruining the engine.

Any Good Fresh Water Cooling System Should Have Excess Cooling Capacity.

Also on oem closed circuit merc engines, risers are always raw water cooled. 86 3.7 mercruiser with closed cooling system. Captain ross, 2009 trojan boater of the year.

It Can Be A Temporary Problem Such As Weed Or Debris Wrapped Around Your Lower Unit.

Oil, power steering and transmission coolers (as applicable) heat exchanger (sea water side closed cooled engines only) cool fuel (efi engines only) sea water pump (some engines) manifolds (if they are sea water cooled) disconnect the hose from the seawater pump to the heat exchanger and connect a piece of hose (usually 1 ¼ inch id) to the. Now my problem is after i filled the cooling system with coolant, coolant starter dripping out of the lower unit (from the water pick up im. Removed the closed fresh water cooling system (now cools off salt water) 7.

Took It To The Dealer For A Scan And They Said It Was Temp Related.

I have a 2007 mercruiser 496 8.1 with bravo 3 and has 130 hours. The 470 has an aluminum block and a cast iron head. Dripping once per sec or faster (and warmer) after the engine run.

Which Is Another Reason Why A Fresh Water Cooling System Is Worth Having Anyway.

The overflow tank will keep filling up over the course of the season untill i pump it out. Also has a closed cooling system. Seawater cooling systems are sometimes called raw water cooling or standard cooling, while closed cooling systems are sometimes called fresh water cooling.

Your Engine Can Overheat For A Variety Of Reasons.

While the plugs are out you also need to do a compression test to determine if there is and issue with the top end. While the mercruiser style composite bodied water pump was very good at resisting corrosion, it lacked much in dry run capacity. With closed cooling you get an early signs of the problem in the form of lower coolant level in the expansion bowl.