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Mend Mercury 50 hp Thunderbolt Powerboats

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Free repair help for Mercury 50 hp Thunderbolt powerboats

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Mend Mercury 50 hp Thunderbolt

cooling problem?

hi i have a 1978 50 hp mercury blueband thunderbolt ignition 4 cylinder have put new impeller on motor but will not pump water to engine cant let it run for long byt steam comes out of pee hole instead of water can you help thanks john

john jones
April 2009
MercuryMercury 50 hp ThunderboltBoats, Powerboats
It sounds like a crimped copper tube at adapter plate under p/head.
The salt slowly crushes the tube causing a major restriction of flow.
Check by removing lower unit put hose pipe on copper tube and see how much water goes thru system.
I have had them so bad that virtualy no water will pass.

Brian
May 2009
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Free repair help for Mercury 50 hp Thunderbolt powerboats