Clunking sound from crank

BrutalSoldier · 09-14-2017, 05:21 PM

I was searching for what could be causing the vibration breaking the S/G bracket when I found something interesting. I was checking big pulley on crank when I noticed some movement. I realized the crank shaft has around a 1/8 inch play in and out of block. I could grab primary and push in with a clunk sound then pull it back to another clunk sound.
Is that normal or could that be my vibration problem??

Dave in VA · 09-14-2017, 06:39 PM

I'm no expert, but I vote "not normal".

Shepard · 09-14-2017, 06:52 PM

Your end play should be .015. Any more and there is a problem.

BrutalSoldier · 09-15-2017, 01:13 PM

Threw my back out so a lot of sitting with a heating pad the last few days.
Anyway wanted to give an update on crank play. When I finally could get under cart to measure the play is more around 1/16 in. Aaron informed me this is normal to allow for heat expansion. Whew thank goodness because I really do love that little 460.

Dave in VA · 09-15-2017, 02:09 PM

Quote:

Originally Posted by Dave in VA

I'm no expert, but I vote "not normal".

Yup, I'm no expert

Shepard · 09-15-2017, 02:59 PM

I won't argue with anyone over this subject - a 1/16 or .0625 is way to much end play - heat expansion or not. I would get a second opinion - Russell Thompson from NR racing would be a good choice. I can't pinpoint any big block information but the gx200 has a end play of .007-.018. To much end play in the crank will give you a possible knocking sound.

09-14-2017, 05:21 PM	#1
BrutalSoldier Addictive Personality Join Date: Jun 2017 Location: Rio Linda, Ca. Posts: 1,289	Clunking sound from crank I was searching for what could be causing the vibration breaking the S/G bracket when I found something interesting. I was checking big pulley on crank when I noticed some movement. I realized the crank shaft has around a 1/8 inch play in and out of block. I could grab primary and push in with a clunk sound then pull it back to another clunk sound. Is that normal or could that be my vibration problem??

09-14-2017, 06:39 PM	#2
Dave in VA maintaining a low profile Join Date: Oct 2009 Location: SW Virginia USA Posts: 6,314	Re: Clunking sound from crank I'm no expert, but I vote "not normal".

09-14-2017, 06:52 PM	#3
Shepard Crazy Ole Man Join Date: Jan 2016 Location: Owego NY Posts: 2,758	Re: Clunking sound from crank Your end play should be .015. Any more and there is a problem.

09-15-2017, 01:13 PM	#4
BrutalSoldier Addictive Personality Join Date: Jun 2017 Location: Rio Linda, Ca. Posts: 1,289	Re: Clunking sound from crank Threw my back out so a lot of sitting with a heating pad the last few days. Anyway wanted to give an update on crank play. When I finally could get under cart to measure the play is more around 1/16 in. Aaron informed me this is normal to allow for heat expansion. Whew thank goodness because I really do love that little 460.

09-15-2017, 02:59 PM	#6
Shepard Crazy Ole Man Join Date: Jan 2016 Location: Owego NY Posts: 2,758	Re: Clunking sound from crank I won't argue with anyone over this subject - a 1/16 or .0625 is way to much end play - heat expansion or not. I would get a second opinion - Russell Thompson from NR racing would be a good choice. I can't pinpoint any big block information but the gx200 has a end play of .007-.018. To much end play in the crank will give you a possible knocking sound.

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