drive train knocking
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There's a metallic knocking on the overrun/ takeup at lower revs which sounds like its coming from front of propshaft / gearbox area . It's been there in all the 5 years I've had the car on thr road & seeing recent tread on propshaft removal prompts me to ask firstly how i can identify the likely cause.
This weekend I'm about to put the motor front wheels up on portable ramps on the drive now we've some dry weather & replace the speedo cable with new one which arrived in post today so I can if required do the necessary inspecting at same time.
In all the 5 years ( only 2k miles tho!) it hasn't got any worse and there's never been any advisories on MOT certificates for UJs , but my first (amateur) suspicion is that front UJ may be source of knocking.
Do you think it be something else , say gearbox output? ('tis 4 speed)
Rich
This weekend I'm about to put the motor front wheels up on portable ramps on the drive now we've some dry weather & replace the speedo cable with new one which arrived in post today so I can if required do the necessary inspecting at same time.
In all the 5 years ( only 2k miles tho!) it hasn't got any worse and there's never been any advisories on MOT certificates for UJs , but my first (amateur) suspicion is that front UJ may be source of knocking.
Do you think it be something else , say gearbox output? ('tis 4 speed)
Rich
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RichC - Fourth Gear
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- Joined: 28 Apr 2009
Gearbox mount or engine mount
Universal joint
worn bearing for prop shaft nose in end of Gb
Overall drive train alignment wrong so hitting engine or GB somewhere
Flywheel loose
Broken clutch disk spring
Could be similar issues at the diff end also but being transmitted up the prop shaft or chassis so appears to come from front.
Get a big screw driver and carefully lever on all the components you can, to see if you can detect any issues when you are under there.
cheers
Rohan
Universal joint
worn bearing for prop shaft nose in end of Gb
Overall drive train alignment wrong so hitting engine or GB somewhere
Flywheel loose
Broken clutch disk spring
Could be similar issues at the diff end also but being transmitted up the prop shaft or chassis so appears to come from front.
Get a big screw driver and carefully lever on all the components you can, to see if you can detect any issues when you are under there.
cheers
Rohan
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rgh0 - Coveted Fifth Gear
- Posts: 8831
- Joined: 22 Sep 2003
As Rohan says check the rear end as well......propshaft to diff flange bolts, diff tie rod bushes and exhaust contacting the chassis.
Roger
S4 DHC
S4 DHC
- oldelanman
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You can eliminate the loose flywheel, even the slightest bit of play combined with the inertia and cyclicle acceleration/decelerations will rapidly increase until it sounds like all the bearings are shot and/or the crank has snapped (been there done that), I am talking of minutes at high RPM, no way could that noise continue for 5 years.
- Chancer
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You can feel/see the front U/J through the hole in the side of the tunnel.
Take out R/H seat and the plastic cover of the tunnel. There should be a hole or flap in the carpet.
If you jack up the rear you can then test for a worn U/J by getting someone to rock one of the rear wheels to & fro.
Take out R/H seat and the plastic cover of the tunnel. There should be a hole or flap in the carpet.
If you jack up the rear you can then test for a worn U/J by getting someone to rock one of the rear wheels to & fro.
Bill Williams
36/6725 S3 Coupe OGU108E Yellow over Black.
36/6725 S3 Coupe OGU108E Yellow over Black.
- billwill
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