Knock when drive engages.

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Number 47
Posts: 199
Joined: 28 Jul 2013 07:11 pm

Knock when drive engages.

Post by Number 47 » 24 Sep 2014 06:51 pm

I have a knock every time I engage the clutch, it is bugging the hell out of me and hard to tell where it is coming from although I supect the diff after laying on the ground under the car while the missus popped the clutch a few times.
Anyone shed any light on this? Halfshafts seem ok, I rebuilt them just a while ago and there was minimum play.
She drives fine once drive is going to the wheels, this just happens when I'm pulling away or changing gear. I do have a gearbox mount where the bush seperated from the housing, is it likely this? If so, any solution?

Ride_on
Posts: 2262
Joined: 26 May 2009 05:34 pm
Location: Belfast, N. Ireland

Re: Knock when drive engages.

Post by Ride_on » 24 Sep 2014 08:02 pm

Yes the gearbox mount would be my first suggestion, the engine and gearbox are pushing against this to drive the car forward.

No standard solution as yet, everything is NLA, some have made custom brackets with other bushes.
1980 345 DL_______1987 360 GLE (project car restored to GLT spec and B230FT'd)
1984 360 GLT______1987 360 GLT
1983 360 GLS______1989 360 GLE
1985 340 GL_______1986 340 1.4
1985 360 GLS______1995 940 SE 2.3 Turbo Estate (daily)
1987 340 GL 1.7

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bogbasic
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Re: Knock when drive engages.

Post by bogbasic » 30 Sep 2014 03:55 pm

Driveshaft splines, Driveshaft splines, Driveshaft splines, Driveshaft splines, Driveshaft splines, Driveshaft splines.... 1000% definite. It'll suddenly give up when you go over a bump and you'll have no traction.
1988 340 1.4 GL, 218k, 5 door (Grey Bess). Gone to CBA.
1991 340 1.7 GL, 64k, 5 door, petrol blue (Deep Blue).
1988 360 2.0 GLE, 140k, 5 door, ocean blue metallic (Blue Bess).
1989 340 1.7 GL, 108k, 3 door (Red Ness).
More info here!

Number 47
Posts: 199
Joined: 28 Jul 2013 07:11 pm

Re: Knock when drive engages.

Post by Number 47 » 02 Oct 2014 07:28 pm

Do you mean the splines on the quill in the torque tube? They were fine when I rebuilt it. Or do you mean the ones in the half shafts? They were also in good condition when I rebuilt them.

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bogbasic
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Re: Knock when drive engages.

Post by bogbasic » 03 Oct 2014 01:53 am

I had the same symptoms as you when a half-shaft spline went. I don't know, but I would guess that if the splines on the shaft are fine, then whatever it slots into might be knackered?? Others on here will know more.
1988 340 1.4 GL, 218k, 5 door (Grey Bess). Gone to CBA.
1991 340 1.7 GL, 64k, 5 door, petrol blue (Deep Blue).
1988 360 2.0 GLE, 140k, 5 door, ocean blue metallic (Blue Bess).
1989 340 1.7 GL, 108k, 3 door (Red Ness).
More info here!

Ride_on
Posts: 2262
Joined: 26 May 2009 05:34 pm
Location: Belfast, N. Ireland

Re: Knock when drive engages.

Post by Ride_on » 04 Oct 2014 12:40 am

Did you by any chance not replace the clamp bolts or not use a torque wrench on them after the rebuild? These are very critical bolts and strip just by looking at them.
1980 345 DL_______1987 360 GLE (project car restored to GLT spec and B230FT'd)
1984 360 GLT______1987 360 GLT
1983 360 GLS______1989 360 GLE
1985 340 GL_______1986 340 1.4
1985 360 GLS______1995 940 SE 2.3 Turbo Estate (daily)
1987 340 GL 1.7

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bogbasic
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Joined: 21 Nov 2004 10:12 pm
Location: New Malden, Surrey.
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Re: Knock when drive engages.

Post by bogbasic » 04 Oct 2014 01:09 am

Hello, I am interested to know which clamp you mean here. Cheers, bog.
1988 340 1.4 GL, 218k, 5 door (Grey Bess). Gone to CBA.
1991 340 1.7 GL, 64k, 5 door, petrol blue (Deep Blue).
1988 360 2.0 GLE, 140k, 5 door, ocean blue metallic (Blue Bess).
1989 340 1.7 GL, 108k, 3 door (Red Ness).
More info here!

macplaxton
Posts: 3283
Joined: 09 Feb 2008 02:29 am

Re: Knock when drive engages.

Post by macplaxton » 04 Oct 2014 10:20 am

The clamp on the spinny-pole inside the torque tube.
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Number 47
Posts: 199
Joined: 28 Jul 2013 07:11 pm

Re: Knock when drive engages.

Post by Number 47 » 04 Oct 2014 10:54 pm

The clamp was torqued correctly. The noise is coming from the drivers rear, I'm starting to think it may be the anti tramp bar that I modified. Tonight I ordered standard springs and shocks for the car as the lowering does not suit the roads I drive on. She is going back to standard. I may have a look tomorrow if I can isolate the noise but it is difficult to be under the car while having drive engaged. I tried it with the rear wheels on ramps and the wife dropping the clutch but it is not ideal. (And bloody scary to boot)

Might try it tomorrow on axle stands. At least that way I can see the anti tramp bar, just won't have as much load on the axle.

Ride_on
Posts: 2262
Joined: 26 May 2009 05:34 pm
Location: Belfast, N. Ireland

Re: Knock when drive engages.

Post by Ride_on » 05 Oct 2014 12:49 am

Number 4 wrote:The noise is coming from the drivers rear
You need to stop blaming the car then!
1980 345 DL_______1987 360 GLE (project car restored to GLT spec and B230FT'd)
1984 360 GLT______1987 360 GLT
1983 360 GLS______1989 360 GLE
1985 340 GL_______1986 340 1.4
1985 360 GLS______1995 940 SE 2.3 Turbo Estate (daily)
1987 340 GL 1.7

Number 47
Posts: 199
Joined: 28 Jul 2013 07:11 pm

Re: Knock when drive engages.

Post by Number 47 » 05 Oct 2014 11:13 am

Ride_on wrote:
Number 4 wrote:The noise is coming from the drivers rear
You need to stop blaming the car then!


:lol:

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