G/box: 5 speed M47: - A rumble mystery

CaptainAhab · Oct 9th, 2015, 12:59

I recently swapped my M45 to an M47. I left the old release bearing in as it was quiet and looked to be better quality than the replacement that had arrived. Soon after the change a rumble started when I pushed the clutch in and 1st/2nd/rev syncro got clunky. I thought this was a classic case of the release bearing not being free to spin, bit the bullet and pulled the box again and threw in the new bearing. (The old one was now noisy to spin and smelt of hot metal, thought I had the problem sorted.)

Car stationary, box in neutral, clutch in, rumble remains. Much wailing and gnashing of teeth.

With car stationary and the clutch pedal depressed the internals of the box should be still. This coupled with fact that the clunkyness comes and goes on all gears leads me to believe it's an external item, my suspicions are now on the pilot bearing.

I will be having the box out again obviously, anything else this might be?

Cheers,

Cap.

Clifford Pope · Oct 9th, 2015, 14:26

Release lever bent or cracked?

Clutch plate distorted from hanging gearbox on the input shaft?

CaptainAhab · Oct 9th, 2015, 14:56

Checked the arm when it was out, looked good.

Would the plate cause a rumble? It should be stationary as well as it's on the input shaft splines.

Thanks for the reply Clifford.

Oct 9th, 2015, 12:59	#1
CaptainAhab Spanner ex machina Last Online: Sep 24th, 2020 17:43 Join Date: Oct 2012 Location: Bangor	A rumble mystery I recently swapped my M45 to an M47. I left the old release bearing in as it was quiet and looked to be better quality than the replacement that had arrived. Soon after the change a rumble started when I pushed the clutch in and 1st/2nd/rev syncro got clunky. I thought this was a classic case of the release bearing not being free to spin, bit the bullet and pulled the box again and threw in the new bearing. (The old one was now noisy to spin and smelt of hot metal, thought I had the problem sorted.) Car stationary, box in neutral, clutch in, rumble remains. Much wailing and gnashing of teeth. With car stationary and the clutch pedal depressed the internals of the box should be still. This coupled with fact that the clunkyness comes and goes on all gears leads me to believe it's an external item, my suspicions are now on the pilot bearing. I will be having the box out again obviously, anything else this might be? Cheers, Cap. __________________ 1988 240DL B230K AKA: Moby

Oct 9th, 2015, 14:56	#3
CaptainAhab Spanner ex machina Last Online: Sep 24th, 2020 17:43 Join Date: Oct 2012 Location: Bangor	Checked the arm when it was out, looked good. Would the plate cause a rumble? It should be stationary as well as it's on the input shaft splines. Thanks for the reply Clifford. __________________ 1988 240DL B230K AKA: Moby Last edited by CaptainAhab; Oct 9th, 2015 at 15:12.

Oct 9th, 2015, 14:26	#2
Clifford Pope Not an expert but ... Last Online: Yesterday 08:50 Join Date: Dec 2001 Location: Boncath	Release lever bent or cracked? Clutch plate distorted from hanging gearbox on the input shaft?

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