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Old 6th January 2017, 15:12   #1
Lord of Hog
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Default Keep on knocking ......

Those of you with chronic insomnia, weak bladders, extremely high boredom threshold etc might have previously come across my musings on a niggle affecting my X-plate 2.5: the mystery knock from behind the driver's seat when negotiating certain short bumps in the road.

After taking advice from other members I concluded it was a loose seat back board and made a note to watch out for some when next at the scrappy. I'm glad I didn't as, the other day when negotiating the picturesque but winding road from Ticehurst to Crowborough, I happened to lay my hand on the tunnel just to the rear of the centre console and felt a definite knock coming through it.

Convinced I'd finally tracked the culprit down I got underneath the old girl as soon as I got home in search of some excess movement in the exhaust or some other similar explanation. With the exception of a distorted heat shield, which I pulled back into shape, there was nothing that could be persuaded to make contact with the underside of the car even when wriggled, shaken and generally bounced up and down with some degree of ferocity.

Conclusion: whatever is doing the knocking has to be actually within the tunnel at about the same location as, or just to the rear of, the handbrake assembly and compensator. The handbrake works fine and has only just passed an MOT. Is it possible, in the opinion of the learned members of this august organ, for something to either have come adrift yet not affected the working of the brake? Or would a properly functioning mechanism with a little more slack in the cables than is strictly necessary cause this sort of sound?

I suppose if there were a handbrake compensator expert reasonably local to me I could have the compensator done just in case and track down the mystery knock at the same time.

Any offers? RH19
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Old 11th January 2017, 10:04   #2
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Bumpety bump ..... come on guys. Give it your best guess
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Old 11th January 2017, 10:26   #3
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Perhaps this is going backwards in order to go forwards but just to recap:
The 'knock' occurs when?
Does the noise have a pitch, a ring or a hollow sound?
You mentioned feeling it through the centre tunnel towards the rear. Did it feel relatively close to your hand?
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Old 11th January 2017, 11:26   #4
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Cool

Something loose in the centre console?
Rear drop links?
Rear anti roll bushes?
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Old 11th January 2017, 11:32   #5
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I recall a knock on the back of my 75 which turned out to be the O/S trailing arm -body bush. It's closer to the centre tunnel than the ARB stuff so might be worth a checkover.
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Old 11th January 2017, 12:22   #6
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How's the exhaust? If this is even anywhere near the underneath when it catches it'll be a dull thud!

Give it a once over and see if any part of it is too close to the chassis for comfort!
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Old 11th January 2017, 12:50   #7
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Is there not a bolted on box section that goes around the handbrake compensator thing ? Could this be lose or something inside the box section ?

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Old 11th January 2017, 12:56   #8
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What about the tank strap, doesn't that bend up in roughly that area? If the tank / strap is moving around that might account for it?
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Old 11th January 2017, 13:06   #9
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The annoying thing is I simply cannot replicate it when the car isn't moving. If I put my left hand on the tunnel while driving along then I can feel it when the right sort of bump is encountered. I reckon the fact that I can FEEL it through the tunnel rather than just hear it indicates it's something pretty close to that point.

I'll try your suggestions as soon as the weather dries out a bit and I can get underneath her without contracting piles or frostbite or both.
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Old 11th January 2017, 17:06   #10
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Wouldn't be the handbrake cable flying up against the bodywork could it?? It must be somewhere near you where are finding that knock.

Drive down a road where you get the knock. Then drive back with the handbrake lightly applied and see if it goes away.
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