Overheating 130hp. Any thoughts?

[southshore]

Hey folks.

At the end of last season the engine overheated on the last 2 runs of the season. The engine was not running well in general.Since then, I Changed the water pump, themostats, Rebuilt carbs, new wires and plugs and new VRO. Compression is 140 across all 4 cylinders.

I took it for a shake down cruise the other day. Engine is running better! Althought it is still overheating at cruising speed. I am stumped. Could it be timing? I was told I have a piston slap. Could that be causing the overheating problem.?

 

[kenmyfam]

Re: Overheating 130hp. Any thoughts?

Have you actually checked the head temp with an infra red heat gun ??

 

[southshore]

Re: Overheating 130hp. Any thoughts?

No but the water pissing out was much hotter than normal

 

[kenmyfam]

Re: Overheating 130hp. Any thoughts?

You may have a blockage somewhere. Did you check the stats are opening at the correct temperature ?? Have you flushed out the cooling system ??

 

[southshore]

Re: Overheating 130hp. Any thoughts?

I did a full flush. How do I know the stats are opening up at the right temp?

 

[kenmyfam]

Re: Overheating 130hp. Any thoughts?

I did a full flush. How do I know the stats are opening up at the right temp?

Take them out, jug of hot water and a meat thermometer. You should see them start to open when the water is around the 140 degree mark and be fully open by around 160 degrees.

 

[southshore]

Re: Overheating 130hp. Any thoughts?

Somone mentioned that there is a "Poppet Valve" that gets clogged. I can't find it on the diagram. Any help?