minitici
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| posted on 22/7/09 at 10:57 AM |
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'Blade clutch problems
I have been trying to sort a Locoblade (1994 Fireblade motor).
One of the clutch spring retaining bolts had snapped and the other 4 were all elongated just under the washer.
 
blade clutch bolt
What is likely to have caused this?
a) Overtightening the bolts
b) Overtravel of the clutch arm
c) Springs too short (Springs appear to be about 4.5mm under minimum size).
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gingerprince
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| posted on 22/7/09 at 11:03 AM |
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quote:
Originally posted by minitici
a) Overtightening the bolts
b) Overtravel of the clutch arm
c) Springs too short (Springs appear to be about 4.5mm under minimum size).
a) is very possible, they don't need much torque to snap!
c) that doesn't sound right. if anything for a BEC you want the blackbird springs which are a little longer than the oem blade springs.
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Bluemoon
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| posted on 22/7/09 at 11:22 AM |
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I would guess a).
You need to torque them up correctly??
I have had an issue with this on some less critical parts, turns out that if you get wax/oil on bolt threads the torque needed can be much less upto
50% less..
Probably not much help!
Cheers
Dan
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MK9R
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| posted on 22/7/09 at 02:45 PM |
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I refitted my clutch earlier this week, i was more worried about the thread in the aluminium basket stripping before snapping a bolt. I'd
honestly expect the thread to strip before the bolt head snapping! My guess is it was the constant pressure of the springs and the heat cycles. I
assume the broken head didn't enter somewhere nasty and destroy the engine??
The springs do compress over time, so you need to replace them if they are short, and you may aswell put uprated ones in then
[Edited on 22/7/09 by MK9R]
Cheers Austen
RGB car number 9
www.austengreenway.co.uk
www.automatedtechnologygroup.co.uk
www.trackace.co.uk
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