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vibration from the front end

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chris k

Post subject: vibration from the front end

Posted: Sun Jul 01, 2007 6:24 pm

848cc

Joined: Mon May 21, 2007 11:40 pm
Posts: 33
Location: Inner West Sydney

can anyone help me with what would be causing this problem.

When I shift through the gears 4th to 3rd and 3rd to 2nd I can fill a vibration coming from the front end as i release the clutch.

It only happens on the down shift only

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1970 Mini Cooper S Mark 11
2006 Toyota Hilux SR5 4X4

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slinkey inc

Post subject:

Posted: Sun Jul 01, 2007 7:58 pm

1275cc

Joined: Wed Jun 14, 2006 9:45 pm
Posts: 4031
Location: Adelaide, SA

Throwout bearing wearing out?

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1964 Morris 850, 1330 Supercharged - 81.8hp atws.
1975 Leyland Mini S 1100S powered - Nice and reliable.
1977 Leyland Mini LS - Project LS-T

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pristic

Post subject:

Posted: Sun Jul 01, 2007 8:00 pm

ausmini mod

Joined: Tue Jun 06, 2006 8:47 am
Posts: 1938
Location: Kellyville, NSW

How high are the revs when your down shifting?
I mean are you slowing the car down with the gearbox or brakes? Is it shudder through the pedal or vibration through the steering wheel?
Does it happen every time? Every gear?

Peter.

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CPOCSM

Post subject:

Posted: Sun Jul 01, 2007 8:00 pm

1275cc

Joined: Fri Aug 13, 2004 3:45 am
Posts: 2360
Location: SE QLD

Oil on the clutch plate I reckon or lightly contaminated with something...

Hooroo

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Rob Forsyth
Miniot!!

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chris k

Post subject:

Posted: Sun Jul 01, 2007 8:17 pm

848cc

Joined: Mon May 21, 2007 11:40 pm
Posts: 33
Location: Inner West Sydney

im slowing down and it vibrates in the steering as im using the gearbox to help me slow down i dont have a rev gauge so its had to tell but its not high revs

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1970 Mini Cooper S Mark 11
2006 Toyota Hilux SR5 4X4

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chris k

Post subject:

Posted: Sun Jul 01, 2007 8:19 pm

848cc

Joined: Mon May 21, 2007 11:40 pm
Posts: 33
Location: Inner West Sydney

i also fill it on the pedels mainly the pedels

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1970 Mini Cooper S Mark 11
2006 Toyota Hilux SR5 4X4

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chris k

Post subject:

Posted: Sun Jul 01, 2007 8:21 pm

848cc

Joined: Mon May 21, 2007 11:40 pm
Posts: 33
Location: Inner West Sydney

it doesnt happen through the gears when im going up in the gears

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1970 Mini Cooper S Mark 11
2006 Toyota Hilux SR5 4X4

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willy

Post subject:

Posted: Sun Jul 01, 2007 8:22 pm

1360cc

Joined: Mon May 03, 2004 6:46 pm
Posts: 13688
Location: ADL

Definitely sounds like a loose bolt in your rear subframe mount.

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drmini in aust

Post subject:

Posted: Sun Jul 01, 2007 8:25 pm

religious status

Joined: Fri Mar 19, 2004 6:19 pm
Posts: 39756
Location: near Baulkham Hills, NSW

It's probably caused by the 6 drive straps (3 sets of 2) on the flywheel that connect the diaphragm and backplate to it, and keep hose parts concentric with the flywheel.
Under drive load they are all in tension = good. BUT, when you downshift and dump the clutch out they are in compression. Not good for a bit of spring steel about 1mm thick... eventually you can buckle and break them, causing clutch or flywheel damage.

Many racers fit 3 straps in each set instead of 2, making 9 in all- if you do this the 3 ears on the backplate need machining for the extra strap thickness. :wink:

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R. :mrgreen:

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mr moke

Post subject: hi

Posted: Sun Jul 01, 2007 10:38 pm

848cc

Joined: Sat Dec 24, 2005 10:30 pm
Posts: 345
Location: Jarrahdale

check your front wheel nut's aren't loose

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chris k

Post subject:

Posted: Sun Jul 01, 2007 10:55 pm

848cc

Joined: Mon May 21, 2007 11:40 pm
Posts: 33
Location: Inner West Sydney

thanks everyone for your replys

i have some cut for me the next few nights until i sort this problem out

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1970 Mini Cooper S Mark 11
2006 Toyota Hilux SR5 4X4

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