Horrendous banging!

Daveluck · 8th July 2016, 23:21

Just don't believe this car - its one thing after another...

Diesel mk1

Anyway I have a horrendous banging when driving the car. Its less on acceleration but loud.

I can feel it though the pedals and bulkhead but very little thought the steering wheel - just a little shudder. However if I turn the wheel then noise increases and I can feel it through the wheel.

If I ease off the gas and coast all hell breaks loose. Really bad, quick rapid banging. Eases slightlyy if I apply the brake. If I reapply the pedal the noise abtes but doesn't go away.

At low speeds its more of a vibration than a bangzing.

At idle just an occasional knock.

Engine sounds fine, transmission is fine

So tommorrow I thought I'd start with checking

1. Lower engine mount ( this is less than six months old )
2. The other 2 mounts
3. Exhaust
4. Drive shafts

Could it be anything else?

It is so bad the car is undriveable.

spyder · 8th July 2016, 23:29

A nail or bolt in the tyre??

clf · 8th July 2016, 23:42

how is it when it is idling?(in terms of vibration) I am thinking a failed as opposed to failing crankshaft pulley? Remove the front right road wheel, and look through the guard, with the engine off! I wouldnt want to be too close with the engine running if it shattered.

Also check the idler pulleys too.

possibly gearbox related too. with engine running, place your hand or safer the tip of a long screwdriver onto the gearbox housing. and when the occasional knock occurs, note if the is vibration felt through the housing. not sure how this would transfer to the steering though, perhaps vibration carried via driveshaft to wheel hub?

Daveluck · 9th July 2016, 00:21

Tyres are all OK.

New crank pulley a couple of months ago ( corteco replacing a failed BSA )

New clutch, dmf and slave last week.

I cant say Definatley but im 99% sure no noises from from either the engine or the transmission while idle or revved.

If I coast and put of gear the banging is still there.

There is some slight play on both drive shafts. They slide about 5mm in and out ( from transmission to wheel ). No idea if that is OK or not?

Its a real shudder making the car undriveable. I had to be recovered home today.

andrewinpopayan · 9th July 2016, 01:25

The N/S driveshaft bearing?

clf · 9th July 2016, 01:29

Quote:

Originally Posted by Daveluck

Tyres are all OK.

New crank pulley a couple of months ago ( corteco replacing a failed BSA )

New clutch, dmf and slave last week.

I cant say Definatley but im 99% sure no noises from from either the engine or the transmission while idle or revved.

If I coast and put of gear the banging is still there.

There is some slight play on both drive shafts. They slide about 5mm in and out ( from transmission to wheel ). No idea if that is OK or not?

Its a real shudder making the car undriveable. I had to be recovered home today.

with the clutch and DMF being replaced last week, I would be tracing back through there. A DMF failure, is not unheard of, but is unusual. I would also question the reassembly. A bolt not tightened, or not correctly torqued, may have become loose on your recent expeditions.

Other things to check would be behind the wheels and the brakes. Check the security of the brake pads, especially for the friction material breaking away from the back plate. If that was to have happened, the pad would catch the disc, and bounce up and down against the calipers as you drive along.

Check too, the mounts of the suspension, wishbones etc.

andymc · 9th July 2016, 09:07

You say it's still audible at idle, which presumably means without the wheels turning. For me that would rule out a fair few things such as brake pads, wheel bearings etc (or an issue I once had with a poorly located wheel-balance weight on the inner rim after getting tyres fitted, which was fouling against the brake caliper). As clf says, the recently fitted crankshaft pulley and/or clutch seem more likely culprits.

With the car stationary, does the noise change at all with an increase in revs?

Daveluck · 9th July 2016, 13:12

So, I duly drove the car up the ramps, climbed underneath...and nothing.

Exhaust nice and tight, steering rack good, driveshafts good, engine rocking slightly but not enough to hit the bulkhead.

OK, let's drop her off the ramps, jack up the corner and check them bearings.

Grapped hold of the wheel at 3 and 9 and the thing nearly came off in my hands.

Really, really loose and sloppy. When I got over the shock and had a proper look.

In 30 years of driving and repairing vehicles I have never ever come across this.

2 of the 5 wheel bolts were missing the other 3, I kid you not, had less than 2 turns on them

How?? I have no idea. Maybe I'm had a senior moment and didn't tighten one side up after dropping them to the floor

I cannot believe how incredibly lucky we were and that we stopped when we did.

Even when giving it a real good look last night in the services before phoning for recovery I just didn't spot it.

I cannot believe how close to disaster we came.

So always check your nuts!

Anyone got any opinion and n what if any damage I might of caused with running on a loose wheel? I can't see anything obvious but given that I missed obvious stuff last night I'm beginning to doubt myself!

FrenchMike · 9th July 2016, 14:05

You're not alone ,i have often noticed for years ,that any repair can generate "secondary issues" ...

So i never intervene before a long trip ....

Mike

clf · 9th July 2016, 14:18