how many crank pin failures??

M

mainer

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Nov 11, 2008
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just a question out of curiosity

when everyone is saying "keyed crank" are they removing the pressed on gear and putting in a keyway?


curious because I dont know as though I remember seeing many (if any) posts about failures of the pin on the pressed on gear.

Harmonic pin failures arent uncommon and cam gear pin failures are somewhat common ....
 
adeso

adeso

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May 30, 2011
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While I agree with asking why, at the same time the shop charged me to key the crank and harmonic for $75 so I think that is why everyone just does it, the shop just puts in one big key and its done.
I am not a engine builder so maybe someone else that knows what they are talking about can chime it.
 
M

mainer

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empire offers the jig/ drill/ pin to pin the balancer in the truck....

I think there have been a few posts by Henry saying he didnt think it was necessary to key anything else.

Just curious to see if there have actually been any failures.
 
JoshH

JoshH

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adeso said:
While I agree with asking why, at the same time the shop charged me to key the crank and harmonic for $75 so I think that is why everyone just does it, the shop just puts in one big key and its done.
I am not a engine builder so maybe someone else that knows what they are talking about can chime it.
Click to expand...
You can't just put one big key in the crank. There is a step in the crank diameter at the pressed on cam gear. The key would have to be stepped as well. Not exactly cost effective. That said, when I had my crank keyed, I had it keyed under the pressed on gear.
 
adeso

adeso

wait, what?
May 30, 2011
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Sorry moment of retardation-the shop charged the same since they put the key on for the harmonic.
That’s why I said someone smarter than me would chime in :hug:
 
Chevy1925

Chevy1925

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Oct 21, 2009
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Well my pins are all bent. Never reved over 3400rpm and ran 560hp. Ill be keying my stuff for sure
 
Mike_S

Mike_S

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Nov 18, 2009
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The machine shop that did my cam couldnt get the crank gear off. He was trying everything he knew, and was worried about making the gear soft with too much heat so we figured that if it wont press off, it shouldnt spin either. My cam pin fell off when i removed the cam gear. I was about 10 miles off from having a catastrophic failure.
 
x MadMAX DIESEL

x MadMAX DIESEL

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Dec 30, 2008
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I'm curious too. Well more about the cam key. I am having the crank keyed forsure. If the cam really needs keying, my machine shop said the other duramaxs he did only had their crank keyed.
 
TheBac

TheBac

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Apr 19, 2008
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It shouldnt even be a question. Key both cam and crank. Seen too many cams over the years with bent pins,and its just cheap insurance to do the crank.
 
Chevy1925

Chevy1925

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ad97abf5-7c8f-17a5.jpg

ad97abf5-7d51-aea8.jpg
 
Chevy1925

Chevy1925

don't know sh!t about IFS
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TheBac said:
James, that cam looks just like mine did. Typical of what happens.
Click to expand...

Yeah, to be honest. Im glad i bent the rods so i didnt shear the pin. My crank was about the same.





x MadMAX DIESEL said:
I guess I will key it, I was just looking to save a little penny somewhere. Looks like that may not be the place to do so.
Click to expand...

Yeah, really its not all that much when you add all the other stuff up. Im penny pinching too and have done pretty well at it. In the end im lookin to have 6k tied up in the motor including the dual cp3s i bought
 
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