tsgtdan

Member
well here it is.
I told you all that I overheated the case 430, and I needed to take it to my grandsons house for evaluation. Well!!!!!!!!!!!!!!!!!!!!!

Pulled the engine down and the crank is broken in 2 places.
I guess all my options are gone, now its a fact, I NEED A CRANK FOR THE 430 DIESEL.
Any help or suggestions will be much appreciated.
The answer to the question, How did I do that? Well as best we can tell after pulling the engine down, there is nothing else wrong. So what came first, the overheating or the broken crank. Did it break once awhile back then it broke again, don't know. We thought there was a lower end knock, but there was no evidence of that.
I do not remember putting that much stress on the tractor.
Oh yea all the little springs on the clutch plate are all broken, not the pressure plate.
Ok guys there it is. I have already kicked my own butt, and had a conversation with self.
Your help will be much appreciated
Dan
 
I'm no diesel expert, just applying basic engine theory here...

What kind of overheating did you experience?

Ran out of coolant because of a leak?
Could have caused major damage, but would be obvious. You say nothing else appears to be damaged, so doubt
that was the cause.

Gauge went to hot without loosing coolant?
Don't see that breaking a crank! Possibly the crank was broken in one place, then broke again and caused
binding, but that should show as damaged bearings or some unusual metal to metal contact inside the block.

Lost some coolant without external leak?
Possible head gasket, could have liquid locked a cylinder. Possible crank damage, but more likely to break
a rod.

Typical causes of a broken crank would be:
Defective when installed, as in cracked, improperly ground main journals.

Block improperly line bored. But that should show as strange wear patterns on the main bearings or failed
main bearings.

Improper balance, either from factory error, mismatched parts during a repair or rebuild, or from an
external source as front balancer damaged or defective, flywheel damaged or defective or mismatched to the
engine, clutch problems.

Engine run out of RPM range.

Whatever caused it, I would be hesitant to just replace the crank without finding a cause and checking the
line bore!
 

thanks for the indept reply Steve.
The engine ran out of coolant before I was aware of the leak. My temp and oil pressure gauges where inop at the time.
The engine looks like it was taken apart before we pulled it down, you know the symptoms, anyway it was not factory work.
So, it ran out of coolent and got noisey, so I shut it down.
Previously we thought we had a lower end knock in it, we could not find any indication of that. I am not real fluent with terminologies on diesel engines, or gas engines.
My grandson is a diesel tech and the shop forman for a diesel truck shop in his city.I will send your post to him, I believe you are correct, there needs to be some testing done to determine what happened and how it happened.
I know i am not answering all your questions, because I don't know the answers, or how to express them.
By the way, this tractor is fairly new to me and has questionable past repairs
Again thanks, I will post progress reports here.
Dan
 

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