She's an S-reg with 230,000m on the clock, but is well-maintained (from 10 months old).
This knock/rattle only occurs at stalling point or switch-off. I've been underneath and it's definitely coming from the gearbox. It happens with the clutch engaged or disengaged - in neutral or in gear. Could it still be a clutch component ? Or is it likely to be the box - or the spigot (if it has one) ? I'm at a total loss. TIA
PP
..or the exhaust which runs close to the gearbox...
Actually, I think the gearbox oil may be low and/or the clutch slave cylinder (attached to gearbox input shaft) maybe clanking about and leaking.
Engine mount.
No. Replaced recently. I'll find out whether or not it IS the gearbox input shaft seal leaking, today.
Did you replace all of them or just one?
All 3 of them. Emptied the gearbox today - looked like a normal amount of oil. Refilled it - but it still rattles like a diamond-back (at stall point) and stays rattling unless revs are applied. No leaks from the bellhousing end of things. Looks like my initial suspicion of gearbox wear could be right. It's still a bit weird though, since box and clutch work flawlessly.
No, that's the weird thing. It carries on regardless, in gear or out of gear, clutch out or in. WTF ?
Does it stop if you apply a little pressure to the clutch pedal if so it could be the release bearing or input shaft thats making the noise.
In an earlier post you said it was poss the exhaust. Try the old big screwdriver test. place it against your ear at the handle end and then use the point as a probe to try and locate the exact point of the noise it could just be the exhaust baffles rattling or the cat breaking up or heaven forbid low oil pressure at low revs.
That was someone else.
Try the old big
I can hear it emanating from the two holes in the bottom of the bellhousing. It's coming from the box 1,000,000% I'm just gunna have to drop the box.
Surely then it's not the 'box, as that's effectively disconnected from the engine when you depress the clutch. So it comes back to a mechanical knock. Gearbox mounting? Also back to the exhaust - if it's anything like the 2.0 petrol, it's mounted to the gearbox through rubber grommets
- perhaps these have split?
Agreed. It's just my paranoia about a stuffed box showing through. The clutch slave cylinder (concentric with the input shaft) could be the culprit, but it seems unlikely that the clutch would work so flawlessly if it were. Same applies to the clutch assembly itself - only more so. The exhaust pipe's well clear of the box, but I'm gunna check the gearbox crossmember-mount nuts today.
So it comes back to a
It's the clutch. Haven't dropped the box to check yet, but it's the clutch/release mechanism.
Have something to add? Share your thoughts — no account required.
Ask the community — no account required