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Restoration & Repair Tips Board

MM water pump

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01-19-2013 14:57:26

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My '41MM RTI kept over heating. I replaced the radiatorstill overheats. I just took it all apart for total restoration and the water pump is pretty basic, Impellers are moving freely with nothing else to inhibit performance. What else would cause overheating? No thermostat.

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Bud Tierney

01-30-2013 13:36:48

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 Re: MM water pump in reply to Mendontractorguy, 01-19-2013 14:57:26  
Head gasket beginning to leak can let hot combustion air from one or more cylinders into coolant with no missing or other symptoms (often will run OK with no load on engine but heat under load/going uphill etc...but try all the cheapest/easiest fixes first...

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01-26-2013 19:29:42

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 Re: MM water pump in reply to Mendontractorguy, 01-19-2013 14:57:26  
Two things not mentioned are:
If you do put a new thermostat in the top radiator hose, make sure it has a hole in it to allow some water to go through or it will boil before the thermostat opens. 1/8" hole is fine.
A thermostat for an 8N ford works.
R's and Z's have what is refered to as a BAFFLE (RE521) around the impeller. If it is missing, the engine will sometimes run hot.

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01-20-2013 10:55:28

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 Re: MM water pump in reply to Mendontractorguy, 01-19-2013 14:57:26  
Check your ignition timing and the mechanical advance. If the timing is running retarded, it will heat up quick. Tocheck the advance, remove distrib cap, grab the rotor and give it a flip. It should move some and then snap back. The works under the breaker plate may be rusted up.

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01-19-2013 18:22:26

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 Re: MM water pump in reply to Mendontractorguy, 01-19-2013 14:57:26  
Lack of a thermostat will in fact cause over heating due to the fact the water flows to fast to cool down do it keep getting hotter instead of having time to cool down.

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01-20-2013 05:54:47

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 Re: MM water pump in reply to old, 01-19-2013 18:22:26  
hen I said 'No Thermostat" I meant I don't see one or anyplace one would have been. This tractor ran fine until just after I bought it from a friend.

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01-20-2013 08:47:18

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 Re: MM water pump in reply to Mendontractorguy, 01-20-2013 05:54:47  
Thermostat should be some place in line with the top radiator hose. You could also have a block that is full of rust and lime and needs to be flushed. My self I use white vinegar. Drain the system and fill with vinegar and run it till hot. Let cool and drain then flush with water from a garden hose. Best way is to rig up a way to use the block drain to flush it

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Mendontractor guy

01-20-2013 09:03:03

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 Re: MM water pump in reply to old, 01-20-2013 08:47:18  
Thanks for the advice. hope to have time tonight to look for that thermostat and will do the flush as you suggest!

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Jon Hagen

01-20-2013 20:04:20

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 Re: MM water pump in reply to Mendontractor guy, 01-20-2013 09:03:03  
Some moline models had a thermostat cartridge inside the top radiator hose. A seemingly unnessary hose clamp in the middle of the hose and a hard spot in the hose is a tipoff.

I also agree to look for a stuck distributor advance or retarded ign timing.

Have also seen overheating from a bad water pump seal leaking air into the system.

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