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Block heater - MF 40b industrial - cord question

S

steve terplak

Member
I have a MF 40b backhoe. It is a diesel. Has a
block heater. Yesterday the cord broke off. Having
a hard time tracking down a replacement cord.
Most seem to have 2 prong.

Or is this pennywise and pound foolish and instead I
should replace the whole thing. If so, how do I
remove the old. Are they threaded or press fit
typically?
a178996.jpg
 
Most Perkins I have worked on are threaded in. You should be able to find cord. Look at Agco's site. I know some of the MF heaters had three wires. Did not know what the third one did but I have seen then like yours.
 
Perkins 3/4 inch pipe thread heaters were two prong, with two center strips that contact the inside heater walls for the ground prong. Freeze plug style had three pins. Might be best in the long run to drain and replace the whole assembly if you can't find the cord.
 
Don't know about those block heaters, but I've bought several of the orange-ish silicone pad heaters that go on oil pans, and I keep having a problem with the wire insulation cracking when it gets cold. The insulation apparently cannot handle temps below -25F very well, and we hit those temps often. Finally got to where I would clip off all but 6" of the cord, then splice in a cheap winter-grade (usually blue) extension cord while making sure any of the original cord insulation is well-covered in electrical tape. Seems to hold up well now.

I don't know if these heaters have a specific polarity or not, but I always take great care to ensure the wires don't get connected wrong. Don't think insurance would like it much if a heater pad caught fire because of my mistake! :shock:
 
When you say drain and replac...please briefly explain....
I assumed it was a 5 min- screw out, thread in type of deal...but thinking about that...might not make sense...
 
Forgot to say, I've got several Perkins block heaters from my NAPA store too. Only one they got that would not fit was recently for my Case 1835C skid loader. Three cylinder Wis-Continental block has the cylinder OD too close for the one they got to fit, would not seat as it should. Had to get that one from Case-IH. It went in place just fine.
 
In the mess AGCO's parts books are, I would have zero idea where to look. I just spent 15 minutes looking in the parts section. I had zero luck there. There is not a coolant heater listed. So I was trying to look in different sections to find it. It is about impossible to get back to that index from the parts diagrams.

Does your coolant heater screw into a threaded hole in the block or go into one of the freeze plug holes???? I found both types supplied from various suppliers.

I have found that when the cords burn up that bad usually the element half is bad too.
 
In all my time working with block heaters. I have found it is better to change the complete heater assembly. Lose and cracked connections. Just cause more problems. Make sure the heater core is not touching the block.
 
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