I called the marina that did my drive service (they said it prob isn't that
because both would be overheating) i have never had a prob w/ them in the
past, but i expect them to say that over the phone becuase there can be 10
other things wrong w/ it too.. There is no mussles or anything growing
(it's dry docked all year long and in fresh water) manifolds are running
about the same the one where the riser is very hot is a little warmer but i
guess that would be as a result of right?

The flaps sound fine, i hear no clacking...

I can check the cooler, but again, at the end of last season all was fine,
winterized it, then had it serviced few weeks ago, then the start of my
problems...

I pulled the hoses to the risers while the engine was on to check the flow,
the 'hot' riser had a little less flow but nothing major, this was all while
on the earmuffs...

I'm clueless... I am dreading bringing it back to the marina the TELLING
them to redo the impeller or recheck it.. I really don't want to do it
myself, it's such a pain in the ass and i need two people for it...


"jim 0010" wrote in message
...
Matt wrote:
It was stored with coolant run through (same as i do every year) There
are no metering balls in the housing, and i toolk the entire housing
apart, everything looks good. Hose's are definately not reversed.
Manifolds/Risers are only 3 years old, fresh water use only. I inspected
the riser and looks good.


"jim 0010" wrote in message
...
Matt wrote:
Hi,

I have a 94' Chaparral w/a 5.7L Mercruiser 350MAG. Looking for some
advice on pinpointing a problem. Here's the story:

Last year everything was running fine. Beginning of this season i had
the outdrive/impeller serviced. After dropping it in the water i
noticed that one Riser gets extremely hot. This is def not the norm.
The temp is constant at 160 (thermostat setting). I took off the
entire thermostat housing (everything was fine), replaced the
thermostat, took off the Riser (everything fine), checked the exhaust
flaps (everything fine), and all hoses looked good. I can't figure out
what could be the problem. My two thoughts, either something happened
over the course of the winter, but what? or when the marina serviced
the outdrive something got screwed up. but if it was an water intake
problem wouldn't both risers get really hot?

Any help troubleshooting is greatly appreciated.

Thanks!!



The first thing to be suspicious of is the work that was just done. Did
you store the engine wet or dry? Dry storage can cause excessive
internal rusting. Rust particles could be clogging a riser or the riser
itself has rusted out and clogged. If your engine has metering balls in
the thermostat housing, they could be worn or where they seat on the
housing could be eroded. Is it possible that you have 2 hoses reversed.

I would go to the water pump and check it carefully, including the part
the copper tube sticks out, of in the upper unit. It might have melted
during an overheat episode. Also make sure the guy used the right rebuild
kit. Make sure the 3/4 diam water hose in the bell housing isn't kinked or
cracked. Make sure you don't have mussels or vegatation clogging the water
pickup vents. Is one manifold much hotter than the other? Make sure your
timing is set correctly. Make sure some broken impeller pieces aren't
blocking the power steering cooler. Are your exast shutters clacking
noticeably?