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Old 03-22-2013, 02:50 PM   #1
cjj737
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Angry Question / Help

I have 67 C10 LWB 250 CI.

The other day i was looking at my engine and ujust happened to grab my fan and give it a lil wiggle back and forth in direction of rotation. To my suprise it moved about half an inch in each direction. My guess is that the crank key has sheered and is alowing it to rotate.

Any suggestions.

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Old 03-22-2013, 03:16 PM   #2
Davemotohead
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Re: Question / Help

Think your fan hooks to your water pump and not the crank? It will also spin as the fan belt will slip.
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Old 03-22-2013, 03:39 PM   #3
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Re: Question / Help

maybe buy yourself a service manual with pictures
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Old 03-22-2013, 04:23 PM   #4
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Re: Question / Help

i do understand that the fan will spin but. the crank pully moves when i move the fan and yes i know the fan is connected to the water pump.
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Old 03-22-2013, 04:29 PM   #5
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Re: Question / Help

sometimes you can turn the entire crank easy if the fan grabs the belt,I often turn my crank by grabing the fan belt and giving it a pull, pull off the pully if you think the keyway is bad and check?
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Old 03-22-2013, 04:33 PM   #6
cjj737
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Re: Question / Help

My guess is keyway i can move it with one finger.
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Old 03-22-2013, 04:36 PM   #7
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Re: Question / Help

Take the Pully bolt out and then look at the crank when you spin the pully and see if its spinning on the crank?
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Old 03-22-2013, 04:50 PM   #8
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Re: Question / Help

Quote:
Originally Posted by cjj737 View Post
My guess is keyway i can move it with one finger.
If is is spinning on the crank your alt light would be on and more than likely it would be over heating
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Old 03-22-2013, 04:59 PM   #9
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Re: Question / Help

there is no pulley bolt unless someone has drilled and tapped it... sounds like something is not quite right...
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Old 03-22-2013, 05:10 PM   #10
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Re: Question / Help

I have seen what you are talking about before When you remove balancer keyway in crank will probally be bad Balancer will probally come off with your hands If crank is tapped for a bolt epoxie a new key in crank and replace balancer If not tapped see if you can tap it for a bolt Otherwise you will have to replace crankshaft The only other alternative (and not a proper fix)is to spot weld balancer to crank to get you by until you can pull engine and fix it right
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Old 03-22-2013, 05:13 PM   #11
cjj737
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Re: Question / Help

my volt meter is still registering volts and it has not died yet.


Faribran there is a bolt in the crank pully not sure when it was put in. i picked up the truck last july.
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Old 03-22-2013, 05:25 PM   #12
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Re: Question / Help

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Originally Posted by cjj737 View Post
my volt meter is still registering volts and it has not died yet.

Faribran there is a bolt in the crank pully not sure when it was put in. i picked up the truck last july.
That is probably why someone put the bolt in because the snout on the crank is worn. You could be lucky and the inside of the dampner is what is worn
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Old 04-15-2013, 03:03 PM   #13
cjj737
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Re: Question / Help

Quote:
Originally Posted by cjj737 View Post
I have 67 C10 LWB 250 CI.

The other day i was looking at my engine and ujust happened to grab my fan and give it a lil wiggle back and forth in direction of rotation. To my suprise it moved about half an inch in each direction. My guess is that the crank key has sheered and is alowing it to rotate.

Any suggestions.



so sunday i decided to change water pump and hoses. and find out why my balancer rotates a half an inch each direction. this is what i found..
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Old 04-15-2013, 03:12 PM   #14
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Re: Question / Help

Quote:
Originally Posted by cjj737 View Post
so sunday i decided to change water pump and hoses. and find out why my balancer rotates a half an inch each direction. this is what i found..
Yep.... that would do it, it should have been leaking alot of oil as well the seal has grooved the snot out of it.
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Old 04-15-2013, 04:03 PM   #15
cjj737
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Re: Question / Help

oh yes she was covered in caked on oil i was putting about a quart a week in.
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Old 04-15-2013, 04:08 PM   #16
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Re: Question / Help

so can this crank be save any thoughts
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Old 04-15-2013, 05:20 PM   #17
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Re: Question / Help

The crank needs to be repaired which means the crank has to come out of the engine and be welded and repaired by a machinist.

If you put a new balancer on that crank without repairing it, the same thing will happen again.

From the photo you posted, it already looks like someone tried to do a "get by for now" repair.
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Old 04-15-2013, 05:51 PM   #18
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Re: Question / Help

That keyway looks to be wollered out. It also looks like someone tryed to peen it with a centerpunch to tighten things up. I hate to say it.. pull it out and get a crank or have that one repaired
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Old 04-15-2013, 08:42 PM   #19
cjj737
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Re: Question / Help

yeah thats what i might have to do but not sure if a machine shop can fix that.???
also thinking of getting a rebuild one to drop in place but being active duty navy kind of hard on the pocket...
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