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Shimano compact crank: Torx driver for bolts, torque?
I'm chasing down a ticking noise in my drivetrain and want to make
sure my chainring bolts are tight. It's a Shimano compact crankset, FC-6750. Can anyone point me to three pieces of information: 1. What size Torx driver do I need for the chainring bolts? 2. What is the torque spec for the chainring bolts? 3. Any recommendation for a set of Torx drivers for my 1/4" drive torque wrench? Thanks. |
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Shimano compact crank: Torx driver for bolts, torque?
On 1 Oct, 22:23, Harry Crumm wrote:
I'm chasing down a ticking noise in my drivetrain and want to make sure my chainring bolts are tight. It's a Shimano compact crankset, FC-6750. Can anyone point me to three pieces of information: 1. What size Torx driver do I need for the chainring bolts? 2. What is the torque spec for the chainring bolts? 3. Any recommendation for a set of Torx drivers for my 1/4" drive torque wrench? Thanks. From the methode d'estructions. Tightening torque: 12 - 16 N·m {106 - 139 in. lbs Seems a bit much. |
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Shimano compact crank: Torx driver for bolts, torque?
In article
, Harry Crumm wrote: I'm chasing down a ticking noise in my drivetrain and want to make sure my chainring bolts are tight. It's a Shimano compact crankset, FC-6750. Can anyone point me to three pieces of information: 1. What size Torx driver do I need for the chainring bolts? 2. What is the torque spec for the chainring bolts? 3. Any recommendation for a set of Torx drivers for my 1/4" drive torque wrench? Hardware stores in the USA typically sell them individually. As for your ticking noise, use all your ingenuity and powers of observation to track down the source of the noise, and do not distract yourself tinkering with stuff. Remember that the noise can come from anywhere. -- Michael Press |
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Shimano compact crank: Torx driver for bolts, torque?
On Oct 1, 5:40*pm, thirty-six wrote:
From the methode d'estructions. Tightening torque: 12 - 16 N·m {106 - 139 in. lbs Seems a bit much. Can you tell me what "methode d'estructions" you are referencing, and how to get a copy of this document? The tech docs I've seen on the Shimano web site are not specific on either the Torx driver or the torque. Thanks. |
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Shimano compact crank: Torx driver for bolts, torque?
Op 2-10-2010 2:39, Harry Crumm schreef:
On Oct 1, 5:40 pm, wrote: From the methode d'estructions. Tightening torque: 12 - 16 N·m {106 - 139 in. lbs Seems a bit much. Can you tell me what "methode d'estructions" you are referencing, and how to get a copy of this document? The tech docs I've seen on the Shimano web site are not specific on either the Torx driver or the torque. Thanks. http://www.shimano.com/publish/content/global_cycle/en/us/index/tech_support/tech_tips.download.-Par50rparsys-0029-downloadFile.html/02%29%20Torque%20Specs.pdf Torx 30. Lou |
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Shimano compact crank: Torx driver for bolts, torque?
On Oct 2, 3:53*am, Lou Holtman wrote:
http://www.shimano.com/publish/content/global_cycle/en/us/index/tech_... Torx 30. Lou Thanks, Lou. |
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Shimano compact crank: Torx driver for bolts, torque?
On 2 Oct, 01:39, Harry Crumm wrote:
On Oct 1, 5:40*pm, thirty-six wrote: From the methode d'estructions. Tightening torque: 12 - 16 N·m {106 - 139 in. lbs Seems a bit much. Can you tell me what "methode d'estructions" you are referencing, and how to get a copy of this document? google - instructions FC-6750 http://techdocs.shimano.com/media/te...9830671266.pdf or Technical Service Instructions SI-1LJ0A-001 The tech docs I've seen on the Shimano web site are not specific on either the Torx driver or the torque. I dont see the fastener size but the torque requirement is clear, "With the marked surface of the smaller chainring facing away from the crank arm, set the chainring so that the o mark is lined up with the crank arm position. Tightening torque: 12 - 16 N·m {106 - 139 in. lbs.}" As I said seems a little high, more than a regular chainring fastening torque. I don't know why, I am not familiar with it. Your suspicions could well be warranted. It would be understandable if only regular fastening torque was used, and so may be the cause of your noise. Good luck. Thanks. |
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Shimano compact crank: Torx driver for bolts, torque?
On Oct 2, 1:43*pm, Ronko wrote:
Does the ticking occur at a certain spot in the crank revolution? Does it occur at this spot regardless of what gear you are in, although it may occur more readily with more pedaling force applied? Yes and yes. The tick seems to emanate from the right (chainring) side, between the top of the pedal stroke and 1/4 forward, regardless of the gear, and only while standing. If so then it sounds like the cups need to be reinstalled and tightened more than they are now. Very possible. Thanks. |
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Shimano compact crank: Torx driver for bolts, torque?
On Oct 3, 11:01*am, thirty-six wrote:
google - instructions FC-6750http://techdocs.shimano.com/media/techdocs/content/cycle/SI/SI_1LJ0A_... *or *Technical Service Instructions SI-1LJ0A-001 The tech docs I've seen on the Shimano web site are not specific on either the Torx driver or the torque. I dont see the fastener size but the torque requirement is clear, "With the marked surface of the smaller chainring facing away from the crank arm, set the chainring so that the o mark is lined up with the crank arm position. Tightening torque: 12 - 16 N·m {106 - 139 in. lbs.}" As I said seems a little high, more than a regular chainring fastening torque. *I don't know why, I am not familiar with it. *Your suspicions could well be warranted. *It would be understandable if only regular fastening torque was used, and so may be the cause of your noise. Good luck. Many thanks for the reference. Before tightening the bolts, I will try to determine their current tightness with a torque wrench. This will give me the general ballpark for their current tightness, and I'll compare this reading to the specs in the documents that you and Lou referenced. (It seems unlikely that they are all significantly loose. It seems more likely that one or two bolts might be a bit looser than the others.) Not a scientific procedure, of course. I wish Shimano had an email address to send these kinds of questions to. |
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