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MD5A OVER HEATING UNDER LOAD

  • Thread starter RICHARD HASKAYNE
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R

RICHARD HASKAYNE

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"MD5A SUPERB STARTER/RUNNER OV

"MD5A SUPERB STARTER/RUNNER OVER HEATS WHEN UNDER LOAD,CHECKED 1.WATER STOP COCK. 2.IMPELER 3.REMOVED THERMOSTAT 4.FLOW OF WATER AT EXHAST MANIFOLD. 5.FLOW OF WATER AT TRANSOM ALL ARE FINE.
I THINK THAT THE PROB IS IN THE WATER GALLERIES IN THE HEAD/BARREL AREA.
HAS ANY ONE ANY IDEAS........
MANY THANKS.
RICHARD."
 
"Richard,
Just an amateur her

"Richard,
Just an amateur here and do not know how similiar the 5 and 6 are, but on my MD6-A raw water engine I found a number of the circulation passages inside the heat exchanger on the manifuld were plugged. Enough were open to allow circulation out of the exhaust.
I was able to restore all of the circulation passages in the heat exchanger by repeated overnight soakings of a Volvo Penta product called Neutra-Salt combined with probing and drilling with various items.
Good success,
Kurt K."
 
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