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Old 26-07-2012, 08:32 PM   #1
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mercrusier 5.7waterproblems

hi don,t know if any one can help, after rebuilding my shakespere650 put in the water started engine after about 10 minuites temp gauge in red investegated and found raw water pump impeller completley shot.i think last person run engine without muffs on. replaced waterpump ass and thermosatat complete with new engine water pump all well for a few miles then suddenly started to judder stopped boat and found water in bilge and large water pipe from waterpump to thermostat housing swollen .engine runs perfect without thermostat but when replaced within a few minutes large pipe swollen again any suggestions please
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Old 26-07-2012, 11:53 PM   #2
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Have you checked the stat opens? Hopefully it will be just that not head gaskets.

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Old 27-07-2012, 06:40 AM   #3
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mercrusier5.7waterproblems

hi stef yes put new stat in water and does open as it should,,cant make it out large water pipe from circalation pump to stat housing ballons up almost straight away when engine started up with stat in someone has said might be exhast flappers blocking exhast causing back pressure am gioing to strip today and inspect thanks mate nick
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Old 27-07-2012, 10:38 AM   #4
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Quote:
Originally Posted by NickGTD40 View Post
hi stef yes put new stat in water and does open as it should,,cant make it out large water pipe from circalation pump to stat housing ballons up almost straight away when engine started up with stat in someone has said might be exhast flappers blocking exhast causing back pressure am gioing to strip today and inspect thanks mate nick
Sounds like there is a blockage. Perhaps a piece of impeller?
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Old 27-07-2012, 03:49 PM   #5
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If you never got all the impeller out you need to back flush the motor as a starting point.
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Old 27-07-2012, 03:58 PM   #6
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Make sure you put the thermostat in the right way round.
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Old 30-07-2012, 09:27 PM   #7
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mercrusier5.7waterproblems

thanks for all your replys. Funny thing when boat idleing temp goes to 0 then when on the move again reads 140 which is what stat is rated at, very strange maybe head gasket gone on one bank. It has already had one done back in 2010, gasket had gone between no,s 6 and 8 in history file. thought it was funny both wern,t changed at the same time though .Am looking into buying new long block as timing cover rusty and its a engine out job to change,shame as very sweet sounding engine. As quoted on boatmad break out another £3000 lol......
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Old 31-07-2012, 11:39 PM   #8
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mercrusier5.7waterproblems

After stripping engine today found rust stain in bottem of one exhaust manifold after removing riser,also coming out from exhaust port. Also found water ingress in inlet ports of head and pitting of bores in two cylinders looks like my engine,s going to mercruiser heven...... bless. New long block on the way....amen
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