On Oct 12, 11:28 am, Jake S wrote:
On Sep 4, 11:12 pm, Jake S wrote:





On Sep 4, 10:02 pm, trainfan1 wrote:

Jake S wrote:
On Sep 4, 9:39 am, "jamesgangnc" wrote:
It is a belt driven pump on the front of the engine. It is serviceable.

"Jake S" wrote in message

groups.com...

My son has a 2000 Four Winns with a 5.7L V8 Volvo Penta (with the dual
props) and it over heats when there is a large group of people on the
boat and under throttle. The first thing I would check is the
waterpump impeller. I read somewhere that that Volvo Penta doesn't
have one in the outdrive (as my OMC or Old Merc did) - If that is the
case - where is it and can a boat owner with mechanical ability check
it? Are there any other suggestions as to what could be causing this
problem? He bought it used earlier this year - it runs great and he
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Does the motor still has the traditional water pump

Yes.

Circulation pump...

on the front like

a car does? If so - there are two on the front ?

Yes.

And a raw water pump with a rubber impeller. Off to the side or below.

Rob

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Thanks to all who responded!- Hide quoted text -

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My Son replaced the impeller and cleaned out somerust buildup in one
of the entries in the thermostat housing. He said ti seemed to work -
I visited him this week and on the last day there we went out on the
boat. Sure enough - take it to full throttle and it over heats - MOST
of the time - one time it only went to the midpoint on the gauge. What
is interesting is that the performance of the boat was horrible
(accelleration was worse than my 4.3L) and full throttle RPM was only
about 4200. I have a friend with an same boat and engine but a 98
instead of a 2000 and his goes to 5500 at full throttle. I am
suspecting that the poor performance and overheating are related. Does
anyine have any idea as to what it could be?

Also, what should the top RPM be for this engine? - my 4.3 is 4800 any
idea on the timing for this engine?

Thanks to any and all who respond.- Hide quoted text -

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Run a compression test. you could have a bad head gasket and/or a bad
head. Odly enough my merc 3.0 in my little chris craft didn't want to
start very well, and even though it would pull 4000 rpm it was
sluggish getting there. however it didn't seem to want to overheat
according to the guages.

found out it had a burnt valve on one cylinder and a bad head gasket.
funny thing, head gaskets. proof that the previous owner over heated
it. for one, he had a delco alternator with the wrong pully (parts
store exchange) and couldn't get the belt tight SO... the water pump
was slipping, to the point of almost hand turning speed when above
idle.

over heat.

alswo my old christ craft cavilier had a sherwood remote water pump
and was wanting to run hot.

found out the problem was a loose belt. new (shorter) belt and all
worked fine.


maybe not related to your son's demise, but I'd still run a
compression test.