Well, another overheating thread. 1988 Aq 260, 275 outdrive.
I had the boat on vacation and used it a few days with no problems. Day four it started getting hot at higher RPM but would drop down to normal (160 deg thermostat) very quickly at idle.
When I got home I began backflushing everything, knowing I had been in some shallow channels and had to have sucked up something. I had a fair amount of sand in the exhaust manifolds, so I hoped that would do it but no such luck.
I read a bunch of threads and decided to try the clear tube check. I replaced the two hoses from the thermostat housing to the manifolds and clamped the garden hose into the supply hose feeding the raw water pump.
Here is where it gets interesting if I haven't lost you already.
At Idle no bubbles but as the RPM's increase so do the bubbles. In past threads it sounds like the air would have to be coming in before the raw water pump, but I have the garden hose feeding directly (through the intake hose from the engine side of the power steering cooler) to the Pump.
Can someone please steer me in the next direction.
Thanks
I had the boat on vacation and used it a few days with no problems. Day four it started getting hot at higher RPM but would drop down to normal (160 deg thermostat) very quickly at idle.
When I got home I began backflushing everything, knowing I had been in some shallow channels and had to have sucked up something. I had a fair amount of sand in the exhaust manifolds, so I hoped that would do it but no such luck.
I read a bunch of threads and decided to try the clear tube check. I replaced the two hoses from the thermostat housing to the manifolds and clamped the garden hose into the supply hose feeding the raw water pump.
Here is where it gets interesting if I haven't lost you already.
At Idle no bubbles but as the RPM's increase so do the bubbles. In past threads it sounds like the air would have to be coming in before the raw water pump, but I have the garden hose feeding directly (through the intake hose from the engine side of the power steering cooler) to the Pump.
Can someone please steer me in the next direction.
Thanks