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Old 25 July 2007, 18:25   #1
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Country: UK - England
Town: STOKE
Boat name: Humma
Make: Humber Destoyer 5.5
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different cylinder pressure

hi
just finnished tidying up wiring,and a few other jobs on my little rib before a trip down the Menie straights this weekend.Borrowed a Pressure Gauge and with help of my girlfriend descide to see what pressure i was getting,we are talking a 1978 Mercury 40 hp 2 cylinder engine,which has had its problems but once up and running goes fairly well 24 mph on the plane.
Took reading top cylinder 110 took reading bottem cylinder barly 75 ?:the engine seems to be running fine starts well and went well two ago,will this last.??? any advice welcome
Stuart
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Old 28 July 2007, 11:48   #2
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she stuck a ring sounds like , not makein 40hp, they don't fix them selfs.
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Old 29 July 2007, 13:07   #3
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Quote:
Originally Posted by stul View Post
24 mph on the plane.
Should make at least 30-35mph...
Quote:
Originally Posted by stul View Post
Took reading top cylinder 110 took reading bottem cylinder barly 75 ?:the engine seems to be running fine starts well and went well two ago,will this last.??? any advice welcome
Stuart
Fred's right. If it aint a stuck ring then the bores are scored.


Chuck a capful of Redex down the plughole with the engine warmed up and tilted. Then put a full can of Redex in a gallon of premix and use it all at about 1/3 throttle (ie just on the plane).
Retest it after that. It should improve if it's carboned up. If it's not rhen forget it...
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