mercury 50 hp 1982, coolant

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gdreames

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Aug 11, 2003
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I have a merc, 50 hp, thunderbolt, 1982 4 cyl. engine that was run into a sand bank. I changed the water pump immediately afterwards. Now when you run the motor with muffins or in a bucket, the water flow through the pee hole normally, but gets excessivly hot within a few minutes. It eventually turns to steam. Does this indicate exhaust getting into the cooling system. A gasket, cracked cylinder, partially plugged coolant path? Any info would be very helpful.<br /><br />regards,
 
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andrewkafp

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Mar 15, 2003
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1,668
Re: mercury 50 hp 1982, coolant

1982 ?<br />Blue band with white "Mercury" text ?? :confused: <br />You say you installed new pump.How was the temp before the installation ?<br />Don't know how much you know about the installation, but would it be possible that you did something wrong ? Merc90hpnewbie, has a long post, which involves a "hands on" water pump job with some great assistance from what you will find to be some great people on this site.You can have a read and jump in. ;) <br /><br /> http://www.iboats.com/cgi-bin/ubb/ultimatebb.cgi?ubb=get_topic;f=29;t=008642
 
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gdreames

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Aug 11, 2003
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Re: mercury 50 hp 1982, coolant

Yes, blue band with white text. S/N 614***X. I have used this motor in salt water approx. two week/year for several years. I always flush it thouroughly when finished. I purchased this used several years ago and it was used in salt water before i bought it. It was steaming before I replaced the water pump. The water pump replacement went very well(I replace all components with exception of the base). The motor still runs very well. Just hot.
 
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andrewkafp

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Joined
Mar 15, 2003
Messages
1,668
Re: mercury 50 hp 1982, coolant

The most common issue, that I have come across on these posts has been "Fragments of old impeller left in cooling system". I have similar motor, a bit older and the telltale and head run very cool. You can put your hand in the stream indefinately. Do a search on overheating related topics for Mercs and see what surfaces..
 
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