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Cat 3126 rear main install tool

Truck Shop

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Dec 7, 2015
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WWW.
Well that put me out of the running, I'm flat broke and cards are full up-----------do you have any long term credit options?:)
 
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Truck Shop

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Joined
Dec 7, 2015
Messages
16,560
Location
WWW.
From 11:00 to 4:00 a.m. Actually the biggest reason for dust is all the dry land wheat. Top soil depth in the Pullman area can run 300' down, around my house it's about 20'.
 

crane operator

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Mar 27, 2009
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8,275
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sw missouri
No progress, I had to play tire man this afternoon. Didn't have time to change to my mechanic hat.

Had to get the tires on the rebel, so I can get the rebel inspected, so I can go to the dmv and get plates and the title transferred, then I can get the insurance on it, then I can get my beautiful bride off my a$$ for not having any of those things done yet, while I'm riding it all over. Priorities truck shop. A man's got to know his limitations.
 

Old Doug

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Oct 16, 2013
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Mo
CO you need to reseal a 3406/3408 with a retarder. Why what you have there is child's play. :)
I did one years ago i know there were special tools to do this but we didnt have them. I was scared it would be a disaster but i got lucky.
 

crane operator

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Joined
Mar 27, 2009
Messages
8,275
Location
sw missouri
Rear main is in, damaged bell housing replaced. Engine reinstalled. Engine will crank starter over but it is not trying to fire. i.e. no smoke at all in exhaust like its getting fuel. I do have fuel at filter.

I think the tach sender unit was damaged. Its mounted to the bellhousing and gets a signal from the starter ring gear. I get no Ohms on it when checking for resistance. Sent Jim to the Cat house. They gave him a new sender unit, but instead of 3/4" fine thread, its only 5/8". Cat parts man says the 3/4" isn't available. Of course the new 5/8" has "NON-RETURNABLE" on the bag.:rolleyes:

Is the cat parts man just dumb and can't find the right tach sender unit?

Will the tach sender unit tell the ecm not to give fuel i.e. engine isn't turning don't give it fuel? I have no computer to hook to the engine to see what it is doing. I don't know if the tach sender is only for the gauge, or it is linked with ecm.

First picture has new sender and old sender. Bag is part # that mother Cat came up with for my sender.

Just to recap- engine is a 2002 3126e Serial #CKM 39839
20201019_085103.jpg 20201019_085118.jpg
 

crane operator

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Mar 27, 2009
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8,275
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sw missouri
What I'm thinking of doing is having a bushing made 3/4" fine SAE thread on the OD, and 5/8" dia SAE on the ID and screw the new sender unit into that.
 

Nige

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Jun 22, 2011
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G..G..G..Granville.........!! Fetch your cloth.
The speed/timing sensors (2 of them - circled) on this engine are allegedly mounted on the front LH side of the timing cover.They are what give the "engine rotating" signal to the ECM
What the Hall Effect sensor on the bellhousing does I have no idea. It is not listed in the Parts Manual. It may not even be a Cat part. I have an idea and just need some time to run it down - stay tuned.

upload_2020-10-20_13-19-52.png
 

crane operator

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8,275
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sw missouri
Although that said the parts guy should've looked at the new and the old and said "that's not right"

Jim said he looked at it, said "that's not right, but its all that is available".

Thanks guys, I'll look into the bushing solution today, and I'm not sure that the tach sender is the "no fuel" issue. I may need a cat man to hook into the crane to see what the ecm is seeing, and where we've pulled on the wrong wire or plug in removal and reinstallation.
 

Nige

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Jun 22, 2011
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G..G..G..Granville.........!! Fetch your cloth.
I thought what you might have there in your photo was the old 3E-7886 Speed Sensor that's used on the flywheel housing of engines like 3500's. However when I dug deeper I found that 3E-7886 services to 318-1181 and there is no instruction that any mods are required to install the new Part Number in place of the former one. So dry hole I'm afraid.

Something about that old sensor in your photo tells me it's not a Cat part but I can't give you a specific reason why. it would be interesting to trace the wiring from it and see where it goes. My bet is that it won't go to the ECM.

Jim said he looked at it, said "that's not right, but its all that is available".
Ask if they can get any info on 4P-5820 Speed Sensor. That's about the last throw of the dice as far as I can see. Even then I'm not sure.
 

crane operator

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Mar 27, 2009
Messages
8,275
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sw missouri
It's in a grove crane, so it may be just a sensor to drive the tach in the upper and lower. Each cab has a tach, so it may be a sensor that came mated for the gauge package from grove. And then it would not be a Cat part, Grove would have just specced the flywheel housing hole, or specced their sending unit to match the standard hole. The used housing I purchased had the same size hole in it as my old sensor, and one of the other used housings had the remnant of a sensor in it that had the wires cut.
 
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