Johnnye23
New member
My 79 351w is running hotter than I like 185-195 at idle,comes down to 160/170 when pulling a skier at approx 3000 rpms. Here is a list of what I have done thus far .
1. New impeller in raw water pump
2. New wire reinforced hoses installed, as hoses were removed visually checked connections, trans cooler for any debris
3. raw water pump flow test 15 sec/3000 rpm was good.
4. New thermostat 143 degrees
5. Removed circulating pump inspected bearings/impeller all looked and felt good( note it looks to be a bi directional pump).
6. Removed sender and gauge and set up on kitchen counter with a battery ( desperation mode here) placed sender in a pot of water with known good thermometer and verified gauge was reading accurately.
7. Using a fake/lake idle temp is only 170 in the driveway
I would think it was a flow problem because the temp decreases with RPM/boat movement . Could it possibly be a head gasket
or cracked head ( no water in the oil) ? I plan on doing a differential leakdown today and will post results. As well as a vacuum test at idle.
Anyone have any ideas or suggestions they would be well received. Thanks in advance .
1. New impeller in raw water pump
2. New wire reinforced hoses installed, as hoses were removed visually checked connections, trans cooler for any debris
3. raw water pump flow test 15 sec/3000 rpm was good.
4. New thermostat 143 degrees
5. Removed circulating pump inspected bearings/impeller all looked and felt good( note it looks to be a bi directional pump).
6. Removed sender and gauge and set up on kitchen counter with a battery ( desperation mode here) placed sender in a pot of water with known good thermometer and verified gauge was reading accurately.
7. Using a fake/lake idle temp is only 170 in the driveway
I would think it was a flow problem because the temp decreases with RPM/boat movement . Could it possibly be a head gasket
or cracked head ( no water in the oil) ? I plan on doing a differential leakdown today and will post results. As well as a vacuum test at idle.
Anyone have any ideas or suggestions they would be well received. Thanks in advance .