R
Rich Haverick
Guest
"Hello, I have a 1990 Bayliner
"Hello, I have a 1990 Bayliner trophy hardtop with a 4.3 v/6 alpha one i/o mercruiser.
The temp. gauge indicates that it overheats at low rpm or idle on the lake or on the motor flusher.
When I rev the motor the temperature drops but soon after ir rises to 200 degrees .i shut it down then.
this is what is new as far as parts; impeller, water pump, thermostat, manifolds and exhaust risers. One thing that I noticed was that the elbow gasket (restrictor) has 2 slots and 2 holes.The one that I took off when changing the manifolds and risers had 4 slots. I modified the new gaskets like the other ones (4 slots) Would this make that much of a difference? Also, should I wait until the temp gauge reads a higher setting 200 or so and maybe give the t-stat more time to open? the t- sat is a 140 degree.It looks like water is flowing everywhere that it should but it still gets hot at idle or low rpm. It cools back down when I rev the motor to 3000 rpm or more. This has been a continuing problem and a frusrating one to say the least. The boat did come from a saltwater enviornment but I have gone through it and changed all parts that I thought that I should. The engine block doesn't seem to have any blockage and has been flushed out (just with a garden hose).
The motor has good compression in all cylinders and runs fine otherwise. Please help if you can. Thanks"
"Hello, I have a 1990 Bayliner trophy hardtop with a 4.3 v/6 alpha one i/o mercruiser.
The temp. gauge indicates that it overheats at low rpm or idle on the lake or on the motor flusher.
When I rev the motor the temperature drops but soon after ir rises to 200 degrees .i shut it down then.
this is what is new as far as parts; impeller, water pump, thermostat, manifolds and exhaust risers. One thing that I noticed was that the elbow gasket (restrictor) has 2 slots and 2 holes.The one that I took off when changing the manifolds and risers had 4 slots. I modified the new gaskets like the other ones (4 slots) Would this make that much of a difference? Also, should I wait until the temp gauge reads a higher setting 200 or so and maybe give the t-stat more time to open? the t- sat is a 140 degree.It looks like water is flowing everywhere that it should but it still gets hot at idle or low rpm. It cools back down when I rev the motor to 3000 rpm or more. This has been a continuing problem and a frusrating one to say the least. The boat did come from a saltwater enviornment but I have gone through it and changed all parts that I thought that I should. The engine block doesn't seem to have any blockage and has been flushed out (just with a garden hose).
The motor has good compression in all cylinders and runs fine otherwise. Please help if you can. Thanks"