Mysterious Knocking Sound - Page 2

Saga Lout · 27th July 2019, 15:05

If it's resonating through the bulkhead, could it be the hydromount? just a thought that the engine is jumping up and down a touch.

Rich in Vancouver · 18th August 2019, 15:58

Roverbarmy's reply that narrows it down to pretty much every part forward of the firewall is a bit depressing. In my ZT I replaced the lower mount, which definitely needed doing and the drop links which were probably OK. I am relatively sure it's the lower ball joints or the lower arm bushings which I will replace when funds come available. That may be a while as the concentric slave cylinder is failing now.

T-Cut · 18th August 2019, 16:40

Could it be from the inner bulkhead? If so, The only thing I'm aware of that can tap/rattle there is the BCU. It's mounted behind the dash and sometimes 'slips'. But it's nowhere as heavy a sound as a suspension knock.

TC

stevestrat · 18th August 2019, 18:31

Do you get the noise more when on a rougher road surface? I had it where the exhaust had dropped just enough to bring the exhaust tunnel cross braces within the normal range of exhaust movement. New rubber mounts and bending the hooks slightly cured it.

27th July 2019, 15:05	#11
Saga Lout This is my second home MG ZT and Rover 75, Join Date: Jul 2013 Location: Wigan Posts: 3,276 Thanks: 2,556 Thanked 2,685 Times in 1,037 Posts	Could it be.... If it's resonating through the bulkhead, could it be the hydromount? just a thought that the engine is jumping up and down a touch.

18th August 2019, 15:58	#12
Rich in Vancouver Gets stuck in MG ZT-T Join Date: Jun 2016 Location: White Rock, BC on Canada's Pacific Coast Posts: 849 Thanks: 338 Thanked 367 Times in 210 Posts	Roverbarmy's reply that narrows it down to pretty much every part forward of the firewall is a bit depressing. In my ZT I replaced the lower mount, which definitely needed doing and the drop links which were probably OK. I am relatively sure it's the lower ball joints or the lower arm bushings which I will replace when funds come available. That may be a while as the concentric slave cylinder is failing now. __________________ ZT-T190, Anthracite, LHD, Left the Line on June 24, 2002, Sold new in Switzerland, spent time in Germany, Imported to Canada in September 2021

18th August 2019, 18:31	#14
stevestrat This is my second home ZT260 #243 (resting) Join Date: May 2010 Location: Prestonpans Posts: 22,463 Thanks: 650 Thanked 4,624 Times in 3,358 Posts	Do you get the noise more when on a rougher road surface? I had it where the exhaust had dropped just enough to bring the exhaust tunnel cross braces within the normal range of exhaust movement. New rubber mounts and bending the hooks slightly cured it. __________________ Steve T4 Location Map

18th August 2019, 16:40	#13
T-Cut This is my second home Rover75 and Mreg Corsa. Join Date: Nov 2006 Location: Sumweer onat mote o'dust (Sagin) Posts: 21,752 Thanks: 341 Thanked 3,660 Times in 2,924 Posts	Could it be from the inner bulkhead? If so, The only thing I'm aware of that can tap/rattle there is the BCU. It's mounted behind the dash and sometimes 'slips'. But it's nowhere as heavy a sound as a suspension knock. TC