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1 hour ago, Jeff Yost said:

How do I know correct/stock muffler from repro? 

I am going by the colour, looks like silver or bare metal. Having worked on the Fox over all their service life, around 1975 to 1990, I recall the silencers being heatproof black. You cannot rule anything out. I suggest you contact the previous owner to find what work had been done to the vehicle before the overheating occured. This could provide clues.

Richard

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Looking at the tail pipe on that silencer it does look like someone has had it made. The original is shorter and has a lip for the ball & cage for wading.

70A47D3E-133A-4A6B-91A6-2ACFC4B3AF95.jpeg

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After removing the silencer guard I tapped on the silencer  and it sounds hollow. Could that be a problem?

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7 hours ago, Jeff Yost said:

After removing the silencer guard I tapped on the silencer  and it sounds hollow. Could that be a problem?

If there is an obstruction or restriction in the exhaust system it will not allow the hot gasses to pass out quickly enough. A copy silencer may be different inside and any sound absorbing material inside might have moved. As you are not coming up with any faults in the cooling system, we have to widen the field searching for causes of temp rise.

The original silencer was very heavy as I recall.

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OK. Was going to drive fox without silencer to see if it would overheat. Best I can tell it is homemade and hollow. Took back cover off and observed ware on the edge of the blower motor belt. Thought of test run with cover off to see if it would not overheat.

image.jpeg

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1 hour ago, Jeff Yost said:

OK. Was going to drive fox without silencer to see if it would overheat. Best I can tell it is homemade and hollow. Took back cover off and observed ware on the edge of the blower motor belt. Thought of test run with cover off to see if it would not overheat.

 

If I am not mistaken, the photo shows the power steering pump pulley and belt

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Your probably right. I'm still learning. What do you think about driving with silencer off and back cover off? If it don't over heat then it might help narrow it down?

Thanks for the help

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He’s not probably right, he is right. There are 4 belts in that area: water pump, power steering pump, alternator & fan drive. You need to have a proper look and make sure they are all there and in good condition. The one in the photo doesn’t look great.

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6 hours ago, Jeff Yost said:

Your probably right. I'm still learning. What do you think about driving with silencer off and back cover off? If it don't over heat then it might help narrow it down?

Thanks for the help

You will find the noise from the open pipe is far to great to go on the road with, although it sounds great (!). When we tested the Fox's after repairs we always left the rear armour off to check for leaks and had a short silencer made to fit the outlet on side of the hull, think it was one from a V8 Rover, you will need something on there. My thoughts are that there is a possiblity tthat sound deadening material in your silencer may be obstructing gas flow, how ever it seems you have not confirmed all the belts are intact yet.

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Hi;  My Fox overheated because previous owner  bored out the sleeves and installed high compression car pistons... a real mess now.  Later  Newc

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