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Wd45

J

jr1983

Member
I am having cooling problems in my 45. I'm
thinking the block is full of scale.
Thermostat isn't in it and it get s up to
temp with no load in three minutes.
Radiator is new temp gauge is new water
pump is new. I also know the previous owner
had an affinity for stop leak and other
additives. Two questions. One is my logic
right and number two what can I do about
it?
 
Put the thermostat back in. Its my understanding that without it, the water runs through the radiator so fast, it doesn't get cool.
AaronSEIA
 
A normal WD45 will almost never have heating problems even pulling it hard with a half covered up radiator so you have some serious problem.It could be scale but I find it hard to think
it'd over heat in 3 minutes with that.Sounds more like something like a head gasket.
 
I'd do a vinegar flush. Drain it then fill with vinegar till good and warm and then let it cool drain and filter the vinegar. Then maybe flush it a 2nd time with vinegar. Then back flush it by way of the block drain and a garden hose
 
I overhauled one that the block was HALF FULL of radiator stop leak sealer from years and years of adding that instead of fixing the radiators leaks. Even at that, I wasn't overhauling it for overheating, but using lots of oil and fouling spark plugs. New temp gauge doesn't mean squat to me. it could very well be defective. 3 minutes to HOT ?? Even with the fan belt left off I don't think that would happen (3 minutes)unless you were pulling it hard.
 
Maybe, but you can keep a 400 cu. Wd45 cool with a 3/8 hole in the back of the head with the block full of concrete just circulating 5 gal a minute with a electric pump.
 
When I pulled the sleeves out of mine the two rear sleeves had rust and scale packed around them all the way to the top. Wasn?t showing any signs of overheating. I don?t know how you could get all that out without pulling the sleeves if that is your problem. I wouldn?t put much faith in the new Chinese made gages either. If the thermostat is out it may never get up to normal temperature. Get a good quality non contact thermometer so you know for sure what the temp actually is at the radiator and on the block and head.
 
I agree with putting the thermostat back in. It is not an old mechanics tale as I experienced it with my model T that has a water pump. A friend who is quite an expert with them told me to put the thermo in to stop parade over heating. It worked.
 

Remove a couple "Freeze Plugs" and power wash the crud out of the block..may need to dig a little to get it all, but works well on just about any of them..
 
Thats not the block and really has no good access to the block. Only way to clean the block is remove the sleeves.
AaronSEIA
 


If no Core Plugs, remove the upper coolant outlet and the rear plate that covers the opening for the rear outlet on top of the head, under the Headbolts (used on earlier models) and remove the Block Drain..ALL places you can access the sediment with a power-washer wand..and stiff wire to help check the progress..
 
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