Fhead Overheating

I have found strange things in the water jacket of old engines. I found a water logged blackened hickory nut in the engine water jacket on an old Scout II which had spent some years sitting in the woods with the thermostat housing off. Squirrels had also filled the air cleaner housing with nuts. Just wondering if something is inside which only plugs stuff up once the flow increases.

 

If you continue to have issues after the new radiator, I’d get an IR thermometer and check header tube temps, as well as block temps.

Any chance the muffler is clogged?

 

No muffler.

 

I had a motor, years ago that overheated. The distributor advance weights were stuck in retarded. As soon as I unstuck the weights, it was OK. Not a jeep.

 

Any chance your just running real lean? What do the plugs look like?

 

definately check the timing and make sure its advancing properly. If I recall correctly these blocks commonly fill up the water jackets on the bottom and back with rust. You'd have to pull the freeze plugs to clean it out.

 

Or running rich for that matter.

 

If the engine has had the cylinders bored over size that can cause the engine
to over heat ?

 

The radiator arrived today. Little narrower than what was in there and I'm sure with some tabs it could be remounted on the grill. Much better than the old copper/brass stuff.



I took off the old radiator and looked in the tubes. Nasty. A few had junk sticking out of them.




I had an M38A1 fan and it is different than my civvy fan. I installed the A1 fan to see if it moves more air?



Since fan shrouds are being used for recovery points now I went ahead and made the radiator mounts out of 3/8" plate. I finished just before it started pouring. We have some pretty bad weather coming through right now and our local tornado sirens aren't working so I'll get back to it after the weather passes over.

 

Looks like the new radiator fixed the problem. 13 miles of hard driving and it didn't overheat so I'm convinced the issue is resolved.

 

Whoohoo!

 

I didn't want to stop driving around but I also didn't want to get a ticket for no tag or registration. This rattle trap is a blast to drive.
One day my title will arrive and I can do more testing.

 

At least it was a simple thing that solved the issue!