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 29-04-15, 18:37
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loose gearbox input shaft ? (video)
Hello friends,
I'm trying to locate knocking noise from the engine, So far I checked crank bearings and nuts, i also replaced timing chain and checked tensioner , But I can not find the knocking. I also checked the balancer and discovered a kind of free play (video attached) dont know if that's ok or not, what do you guys think, is this normal?
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I apologise for any mistakes in my English, i am still learning 
Last edited by ram; 01-05-15 at 16:45. |
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29-04-15, 20:57
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That isn't the balancer shaft, it's the gearbox input shaft (where the clutch fits). The balancer shaft and drive gear is the one above and to the right.
AFAIK there is no "end float" measurement mentioned by Yamaha, but a little is normal to allow for expansion/contraction as the engine warms/cools. It is difficult to tell how much you are moving the shaft in and out. Have you measured it? Most bikes I've had that have gearbox shaft end float figures given tend to be in the 0.05-0.15mm region. One question you might find difficult to answer now with the bike in pieces is, does the rattle/knocking sound go away when the clutch (lever pulled in) is disengaged? |
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30-04-15, 02:56
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Quote:
__________________
Yamaha xt660x 2009 blue/gold mods= iridium plug, stage1+2, removed snorkel, blocked ais, akrapovric pipes, power commander pc3usb (pre made map), adjusted tps, dynojet 02 optimiser 30amp aux relay, smoked puig screen, oxford heated grips and brembo carbon ceramic pads, rfx 30mm bar raisers, puig long adjustable leavers, plus much more and a cheep �30 alarm which stopped it been stolen |
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30-04-15, 03:07
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Quote:
__________________
Yamaha xt660x 2009 blue/gold mods= iridium plug, stage1+2, removed snorkel, blocked ais, akrapovric pipes, power commander pc3usb (pre made map), adjusted tps, dynojet 02 optimiser 30amp aux relay, smoked puig screen, oxford heated grips and brembo carbon ceramic pads, rfx 30mm bar raisers, puig long adjustable leavers, plus much more and a cheep �30 alarm which stopped it been stolen |
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28-04-16, 09:37
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Hi! I also have that free play on the gearbox shaft and about the same amount. First I thought the clutch basket is loose but it's the whole shaft moving. Oh well, so many noise sources on that engine, crankshaft nut on my XT660R was not finger loose, but I still managed to tighten it a fair amount until 120Nm. Haven't started the engine yet, still have to check valve clearances, but hopefully it will make less noise then.
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11-07-16, 20:31
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Not sure if its any help but I have my motor in pieces at the moment and the clutch basket has absolutely no play in it at all, rock solid. I will be removing it next month when I have the tools but until then cant say if the shaft moves without it.
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Now have a 2017 S1000XR Sport SE 2006 XT660X - Cat D write off due to someone pulling out on me - Pipewerx carbon fibre exhausts - Snorkel removed and airbox drilled - DNA stage 1 + 2 air filters - Kevs fuel controller mod - Scottoiler V system - Oxford heated grips - HEL braided brake hoses - Wilbers 540 rear shock - Brembo brake pads - AFAM chain and sprockets - Michelin Pilot Street Radial's - Denali DX Xtreme dual intensity spotlights 
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08-10-18, 10:47
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When i checked primary drive nut, i also noticed that i have free play of clutch basket. What can cause free play?
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26-10-18, 13:25
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Quote:
This give the illusion of crank stretch but as you know the nut is still fully Loctited, so does give the impression and add to the illusion! Just fitted my third washer this year! And taken Minky’s advice and torqued the crankshaft nut up to 120Nm, but some have taken this higher (just be careful as if the bearing preload is too high there will be increased bearing wear). Last edited by Ferg; 26-10-18 at 13:26. Reason: Apple.......changed bearing for breathing!!LoL |
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