Diesel bottom engine mount & knocking sound - Page 2

Comfortably Numb · 8th November 2019, 19:00

I can't understand why these bushes and the arms that go into them are hexagonal, so designed to resist rotation. Looks like it's been designed to make it split. I would have made the end of the arm cylindrical, with a nut, and 2 big washers each side of 2 top hat rubber bushes, with a stainless steel spacer bush running through the middle. Having read some posts on the difficulty of getting these bushes off the arms (1 arm definitely needs replacing), I have got the DMGRS bushes, so I can fit the complete bush and arm together. I'll see what state the old bushes are in when I remove the arm with the bush still on it.

COLVERT · 9th November 2019, 22:11

Quote:

Originally Posted by Comfortably Numb

I can't understand why these bushes and the arms that go into them are hexagonal, so designed to resist rotation. Looks like it's been designed to make it split. I would have made the end of the arm cylindrical, with a nut, and 2 big washers each side of 2 top hat rubber bushes, with a stainless steel spacer bush running through the middle. Having read some posts on the difficulty of getting these bushes off the arms (1 arm definitely needs replacing), I have got the DMGRS bushes, so I can fit the complete bush and arm together. I'll see what state the old bushes are in when I remove the arm with the bush still on it.

I guess they were made that shape as anything cylindrical that lives in wet conditions can slip as water is a lubricant on rubber.

Comfortably Numb · 9th November 2019, 22:24

Quote:

Originally Posted by COLVERT

I guess they were made that shape as anything cylindrical that lives in wet conditions can slip as water is a lubricant on rubber.

So why not make them cylindrical, grease them, and let them rotate?

COLVERT · 10th November 2019, 08:46

Quote:

Originally Posted by Comfortably Numb

So why not make them cylindrical, grease them, and let them rotate?

Their shape also makes them act as torsion dampers.---

They assist the telescopic dampers.

HarryM1BYT · 10th November 2019, 09:09

My MOT place suggested they could not be done without sub-frame removal. I did mine without disturbing sub-frame. The big problem was getting spanners onto the two large bolts and managing to turn them with such a restricted arc. I managed, using a series of different spanners, each with a slightly differing angle with a lump hammer. I did it working in a borrowed pit, with the wheels on the ground.

Aside from the problem turning the bolt heads, it was difficult to persuade the bushes to slide off the arms - a bit of lub help with that, once you get them moving.

ceedy · 10th November 2019, 12:36

Popped the Zeds undertray on for the winter and grabbed a photograph of one those rear bushes..

the Rubber seems ok, but then it should at only 14k miles ..

But the inner plastic bush has split

...... so a bit cr@p really

C.

COLVERT · 10th November 2019, 17:01

Quote:

Originally Posted by ceedy

Popped the Zeds undertray on for the winter and grabbed a photograph of one those rear bushes..

the Rubber seems ok, but then it should at only 14k miles ..

But the inner plastic bush has split

...... so a bit cr@p really

C.

Guess they never bench tested them after they made them.---

10th November 2019, 09:09	#15
HarryM1BYT This is my second home 75 Contemporary SE Mk II 2004 Man. Sal. CDTi 135ps, FBH on red diesel, WinCE6 DD Join Date: May 2010 Location: Leeds Posts: 17,273 Thanks: 2,160 Thanked 2,061 Times in 1,586 Posts	My MOT place suggested they could not be done without sub-frame removal. I did mine without disturbing sub-frame. The big problem was getting spanners onto the two large bolts and managing to turn them with such a restricted arc. I managed, using a series of different spanners, each with a slightly differing angle with a lump hammer. I did it working in a borrowed pit, with the wheels on the ground. Aside from the problem turning the bolt heads, it was difficult to persuade the bushes to slide off the arms - a bit of lub help with that, once you get them moving. __________________ Harry How To's and items I offer for free, or just to cover the cost of my expenses... http://www.the75andztclub.co.uk/foru...40#post1764540 Fix a poor handbrake; DIY ABS diagnostic unit; Loan of the spanner needed to change the CDT belts; free OBD diagnostics +MAF; Correct Bosch MAF cheap; DVB-T install in an ex-hi-line system; DD install with a HK amp; FBH servicing. I've taken a vow of poverty. To annoy me, send money.

10th November 2019, 12:36	#16
ceedy This is my second home All Trophy Blue ,ZT260#50 , ZT CDTI Auto, ZR105+ and 1.8T Firefrost spoiling the Set . Join Date: Nov 2006 Location: Nr Sherborne But in Somerset.. Posts: 6,075 Thanks: 916 Thanked 1,214 Times in 768 Posts	Popped the Zeds undertray on for the winter and grabbed a photograph of one those rear bushes.. the Rubber seems ok, but then it should at only 14k miles .. But the inner plastic bush has split ...... so a bit cr@p really C. __________________ The Three Bloo's Wifey's Zr105, MY CDTI & 260 #50 and Number One sons 1.8T in Firefrost When I were a lad Zero to 142 in 10.25 secs at the Pod on my Blown Norton. 210 Kart Champ in 70's Last edited by ceedy; 10th November 2019 at 12:39..

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8th November 2019, 19:00	#11
Comfortably Numb Posted a thing or two Rover 75 Saloon Join Date: Dec 2017 Location: Penrith Posts: 1,336 Thanks: 165 Thanked 303 Times in 241 Posts	I can't understand why these bushes and the arms that go into them are hexagonal, so designed to resist rotation. Looks like it's been designed to make it split. I would have made the end of the arm cylindrical, with a nut, and 2 big washers each side of 2 top hat rubber bushes, with a stainless steel spacer bush running through the middle. Having read some posts on the difficulty of getting these bushes off the arms (1 arm definitely needs replacing), I have got the DMGRS bushes, so I can fit the complete bush and arm together. I'll see what state the old bushes are in when I remove the arm with the bush still on it.