TurboFire

[Bob Vic]

I'm working my way through the 318 Chrslyser overheating when at idle. The temp is running at 60 degrees C at planing speeds but climbs to 90 + at idle. So a new thermostat and pump impeller are both going in but I'm now wondering if the inlet side of the Magnaflow cam driven pump is underdone. The pump has a 1 1/4" inlet but is fed by a 1/2" hose coming off dual water pick ups.

I'm thinking that at idle the cam pump is only spinning at 300 rpm and may be starved of sufficient water.

Any thoughts or suggestions?

[Alan]

I would prefer to see a 5/8" coming from the T of 1/2" hoses, and how strong is the bypass spring for when the thermo is closed? What temp thero?

[Bob Vic]

Today I replumbed the inlet side of the water pump. The hoses from the pick up to the Y piece are 1/2" id. The T has been replaced with a Y fitting. The outlet from the Y fitting to the pump is 3/4" id. The 90 degree fitting into the pump has also been eliminated. A new thermostat is now fitted - 160 degree which is the same as the old (original) one replaced. Final job is to check the water pump impeller.

[Bob Vic]

Job finished and problem solved. Replaced the impeller today and ran the engine for about 10 to 15 minutes at idle, pumping water from a bucket. All good for the Glenmaggie celebration weekend.

[Bob Vic]

At the Glenmaggie get together I realized that I had an exhaust manifold leak port side of the 318 Chrysler. Over the past couple of days, and in preparation for the Hawkesbury event, I pulled the manifold off to see what was going on. The gasket was totally shot and I'm surprised that the exhaust leak wasn't a bigger deal. Turns out the face of the manifold wasn't flat so after an hour or more of flattening the face on 60 grit wet and dry stuck to a piece of float glass plate, the faces were flat and ready for a new gasket and high temp silicon sealant. All that's left to do now is re plumb the water hoses and do an oil change and we're good to go.

[WoodRay]

Nice work Bob. Shed time finally too!

[screwit]

Thats a good out come Bob.
I have started getting the boat trailer ready for the upcoming trip with new runners and carpet.