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Old 02-04-2012, 10:41 AM   #1
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3406E crankshaft breakage

Maybe someone could give me an idea understanding what causes a crank to break in a 3406e while cruising down the highway at 65mph. Thanks
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Old 02-04-2012, 02:08 PM   #2
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Whatever it was that caused it to crack in the first place. Just finally gave out.

Out of balance, abusive driving (i.e. severe shock loads),..............
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Old 02-04-2012, 08:04 PM   #3
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If it breaks at the #2 throw it is from the belts to tight, That is the area and cause of most breaks.
#5 throw is usually from the transmission being loose.
Tell us where it broke, and pictures, of the break area.
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Old 02-04-2012, 08:10 PM   #4
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Quote:
Originally Posted by 20RPM View Post
Maybe someone could give me an idea understanding what causes a crank to break in a 3406e while cruising down the highway at 65mph. Thanks
There are alot of reasons posted on here, but the real reason is because Cat admitted to having a supply of defective crankshafts. Ynot explained this sometime ago. Particularly the 5EK and 6TS series. I had one of each to break at the #1 journal. Both had less than 800K miles.

I had a Cat service bulletin at one point explaining this. I'll try to find it and post.
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Old 02-05-2012, 02:30 PM   #5
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Cat admitted to having a supply of defective crankshafts. Ynot explained this sometime ago.
Wasn't that the PO'ed union worker's sabotage with the casting mix?
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Old 02-05-2012, 04:08 PM   #6
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Yea right and the metallurgical guys were involved the machinists and the guys that do the testing the engineers that designed it, the truck driver that took it to the assembly plant and the machine that put it together. Everyone was to blame and the Management got a performance bonus. Those dam workers are destroying the economy.
Did I hit all the Frank Luntz hot buttons.
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Old 02-06-2012, 09:02 PM   #7
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Wasn't that the PO'ed union worker's sabotage with the casting mix?
I do think there was a point and time that they went through the metal not having the proper makeup, I believe it carried over to the cams as well causing them to wipe out lobes. Not sure if it was the workers or not though.


John, where do you come up with these ramblings, a fault with the metal makes sense as opposed to anything that you posted, there could have very easily been something left out of the metal production process.
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Old 02-06-2012, 10:22 PM   #8
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It just gets a little stale when it is always a union member, that cased the problem the Cam problem went on for years, I only saw one crank broken and that was from the belts. These defective cranks were was it they broke?
The cams were not a strong point for the B or C let alone the "E".
The rollers failed, the rocker arms bent, studs st reached, was that all someone else's fault?
Every batch coming out of the pot in a foundry, there is a sample taken for testing. someone with a lot higher pay grade than a union member has to OK every batch.
We all know it could not be CAT trying something different.
I was working at and engine dealership when Detroit had a huge batch of defective Cranks there was not talk about a conspiracy they recalled thousands of engines and replaced them with new one's. Thousands of engines because a key way was cut into the nose cone fillet.
What did Cat do? I never heard of a recall, what was the number?
I did a lot of Cat work and always went on line looking for any recalls according to serial number. If it was not done by the service writer.
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Old 02-10-2012, 02:40 AM   #9
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Wasnt just 5EK and 6TS, we had a rash of 7CZ's that broke cranks,some at #1,most at #6,one at thrust. A couple were million mile crankshafts,most of the failures didnt make 750,000
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Old 02-10-2012, 04:43 AM   #10
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we just did an mbn at work. broke at #6
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