960 question

Phil960

Member
I'm still working on my overheating problem. Removed radiator (which I discovered has a couple of small leaks) will take it to repair shop.

My question is I replaced the intake/exhaust manifold right before the overheat problem. The new manifold is slightly different from the old one in that, on the old one the intake is straight horizontally. The new manifold has slight elevations that appear to have been designed to give more clearance for access to the carburator. It all bolted on fine but I'm wondering if it's possible that the difference in air flow would affect the engine temp.

Based on all of you guys help I have flushed the block and tested the thermostat and after removing and inspecting the radiator am leaning towards the radiator being the culprit. It needs some repair as it is so it's going in but I'm just wondering about the manifold.

Thanks again for all of your help, I'm learning much from you guys and really appreciate all of the advice.
 
i doubt that small change in manifold geometry would cause your overheating. A lean condition COULD cause some heating.. thus a gasket issue might have contributed.. if the rad is plugged.. that would deffinately be an issue. the rad shop hopefully will rod it od and test it for you.

oce you get it back, check your carb and manifold gaskets and see what ya got.

if you have a non contact temp gun.. check a few spots and see what ya got.

also.. do you have the oem heat shields in place around the manifold?

you can also see if your pump circulates water with a hose-off test. though i rarely see an impellor rust completely away.. I have seen one that nearly did..
 
It's not the design of the manifold.

Are you certain that there were no over heating issues prior to the current issue?

Dean
 
Dean, According to the temp guage and me not noticing any steam or overflow seepage, there were no issues overheating. I did notice a small leak in the rad coil but never lost enough antifreeze to require adding any.

Soundguy, I tend to agree with you on the air flow assessment although I know it can make a huge difference in a 2 cycle engine. A completely different animal but it's part of why I asked this question.

I was very careful when putting the gaskets in for the manifold and carb as I know that can be an issue, so I'm confident there's not an issue there.

I do have a heat temp gun but had not even thought about looking for hot spots. That's a great suggestion and I will do that.

After looking at the radiator closely, I'm starting to think that's the prob. Now I just hope they can fix it.

Thanks again guys. This is my first foray into an old tractor so I'm soaking up your knowledge like a sponge. Hopefully, one day I will be able to help someone else.
 
i've seen cores so plugged that they flowed only a trikle and caused fast overheating.

if your rad shop can't fix it.. see what they can source as replacement core.. get a hd core with more tubes.. ot less. I have seen some light dutry core with few tubes.. they are not as good..

The more hp you use.. the more cooling you need.

I have a 950 mutt/parts tractor with a non oem radiator from smal weird import car that I found to fit in.. it is less capacity.. I can make it boil if I work the tractor to full potential. for now I hung a carb on it for a 134ci eng to reduce the ponies and cooling needed. now I can run it to the hilt that the carb will allow and not heat... one day I'll find a good rad for it an put it's larger carb back on...
 
Again, you symptoms point to coolant flow issues.

Normally, I would recommend inspecting the water pump impeller for wear but this cannot be your problem IF the symptoms appeared suddenly.

Dean
 
Phil;
I hope its this easy for you! I never minded a little egg on my face if it meant an end to my problems.
I went and looked at some photos of some restored 960's. They all have The muffler just about laying on the intake manifold and the top of the motor with a heat shield between them.
A-hem, when you put yours back together did you include the heat shield?
Hope it's that easy for you! GT65
 
Well....no. The only heat shield is above the muffler and below the gas tank. Looking in the parts manual, all I see is the heat shield between the fuel tank and the muffler. Am I missing something?
 
(quoted from post at 09:27:35 01/04/13) Well....no. The only heat shield is above the muffler and below the gas tank. Looking in the parts manual, all I see is the heat shield between the fuel tank and the muffler. Am I missing something?

I don't think you are "missing" anything Phil, I think there is just the one sheild between the muffler and fuel tank. Keep chasing your coolant flow issue.

Chris
 

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