P38 4.6 videoed loud banging noise when driving.

Lazylabs · Jul 12, 2015

https://vimeo.com/133266524

Any ideas on what this noise is?

Only happens when driving along with revs above 2000. Doesn't happen if rev engine in neutral.

Could it be something in the cats? As just fitted some used sports cats. I thought it was the exhaust banging on the cross member but padded that out and still same problem.

Car drives fine. Been towing this weekend.

Any ideas?

Cheers
Al

Datatek · Jul 12, 2015

Lazylabs said:
https://vimeo.com/133266524

Any ideas on what this noise is?

Only happens when driving along with revs above 2000. Doesn't happen if rev engine in neutral.

Could it be something in the cats? As just fitted some used sports cats. I thought it was the exhaust banging on the cross member but padded that out and still same problem.

Car drives fine. Been towing this weekend.

Any ideas?

Cheers
Al

Sounds like something loose rotating to me, not cats, prop UJ shot maybe, hope it's not big ends

biketeacherdave · Jul 12, 2015

So your saying it didn't do it at all before you fitted the sport cats? Can you refit your standard ones ? Just to eliminate

Grrrrrr · Jul 12, 2015

biketeacherdave said:
So your saying it didn't do it at all before you fitted the sport cats? Can you refit your standard ones ? Just to eliminate

+1. Try it with exhaust of and pray it isn't the UJs!

Myredrangey · Jul 12, 2015

+1 on a prop shaft universal joint, get under there and give them a wiggle.
When my front one went it was obvious because of the play in it...I posted a video a short while back.

http://vid441.photobucket.com/album...trim.3522FD21-0D70-4E8A-A0C4-4AD47451B2F8.mp4

Lazylabs · Jul 13, 2015

Didn't do it before cats changed.

Did grease the uj at the same time. No play in them then.

Car performs as normal.

I have original cats so will be swapping them back to eliminate.

The noise is definitely linked to revs.

Lazylabs · Jul 13, 2015

And fluctuates through the Rev range.

Sounds like I have a lambretta stuck under the car.

Grrrrrr · Jul 13, 2015

Lazylabs said:
Sounds like I have a lambretta stuck under the car.

Well, that is another possibility!

Lazylabs · Jul 14, 2015

Ok old cats put back on and same problem.

Had car on axle stands. In gear rotating the wheels no noise.

Grabbed and shook propshafts no movement.

Started engine and can hear a knocking at idle. Left hand side of the engine. Rev it and can hear it no and then but not constant.

Took serp belt off to check pulleys and seems to be a fair bit of play in the water pump shaft.

https://vimeo.com/133471307

This water pump is only 2 months old.

Noticed tiny bit of coolant on the water pump. Looks like coming from just under the water pump shaft. No overheating issues at all. But could the play in the shaft causing that noise?

Arghhhhh

Datatek · Jul 14, 2015

****part water pump?

Lazylabs · Jul 14, 2015

No bleeding airtex one. Paid the extra for this very reason.

Lazylabs · Jul 14, 2015

But the bloody v fan coupling is I think. And it seems to have loads of play in it.

Lazylabs · Jul 14, 2015

Who makes the oem v fan couplings?

Grrrrrr · Jul 15, 2015

Don't know but a whole new OEM viscous is about £120 from Island.

Grrrrrr · Jul 15, 2015

Got my old one in a box if you want to swap it over for testing. It doesn't work mind.

Datatek · Jul 15, 2015

Lazylabs said:
But the bloody v fan coupling is I think. And it seems to have loads of play in it.

If it's the viscous fan, better not to drive it as if it lets go it will take out the RAD.

Lazylabs · Jul 15, 2015

Grrrrrr said:
Got my old one in a box if you want to swap it over for testing. It doesn't work mind.

Thanks for the offer, I ordered OEM one from island last night as not happy with the play in it anyway so need to replace it. Just hope it hasn't damaged the water pump.

Shall see if it is the cause..

Will remove the bell housing inspection plate today and see if the flex plate is ok.. Is there a particular test or is it just a visual inspection while hand cranking the engine?

Datatek · Jul 15, 2015

Look for signs of cracks, fret marks etc.

Lazylabs · Jul 15, 2015

Ok took the Access plates off this afternoon and found this:

https://vimeo.com/133565255

Also from the drive plate view. Not much to see but few photos

Any comments or thoughts most welcome.

Lazylabs · Jul 15, 2015

I'm thinking possible bolt come loose and rattled around the housing causing all those marks?

Also what is that that is actually marked?

P38 4.6 videoed loud banging noise when driving.

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