exhaust rattling phenomenon cured

[hodroyd]

Fossy,
Fantastic Mate, well done, get some pics on the subject, loads of interest. Thanks!
Cheers
R

 

[Elliott653]

Excellent fix. I look forward to seeing the photos.

 

[halbe01]

Me too - always wondered what these manifolds actually look like... my knowledge is all theoretical!

 

[conaero]

The problem as iv found out and cured it, was the collector area of the manifolds. Basically, the collectors inlets are 4 stumps of pipe which the outer pipe of the manifolds slot over and get welded, but the inner lining slots into the collector without welding as an interference fit. The inner pipe where slotted into the collector loosens over time and has enough movement to create the rattling.
Many have had the inner pipes welded within the collector box (cat section removed for access), but a simple heat up and center punch to each sorts it (its what maserati did during manufacture of them , have a look). This tightens the whole inner/outer juction and its fixed in 15 mins, no stripping down or welding ! Someone i know did this 5 years ago and after 50,000 miles further, has no issues.
I will post a pic up of what iv done if anyone requires

Excellent, make sure you do take some pics and do a how to thread as I was struggling to visualise from your description above...pics always help...well done!

 

[Fossy]

I hope this helps explain it, i'm not good with computers.

 

[hodroyd]

Fossy,
Well done mate, did you take any pictures with all the bits off..??
Cheers
R

 

[beau]

anyone else fixed this? bit confused what to do

 

[Spartacus]

yes so am i . i have this rattle from the left bank . what do i need to do ?

 

[Contigo]

Drill it, pinch it and weld it. It's all in the thread mate!

 

[Wack61]

Mine has just started with the rattle that goes off as soon as it's warm , leave it for 20 minutes and it's back

 

[Spartacus]

Annoying isnt it!? . Im still none the wiser to where to centre punch the exhaust to stop this . Has anyone got any clue ? That is indeed one dodgy diagram ;P

 

[allandwf]

Looks straightforward to me, first view is straight on, 2nd is turned 90 degrees. Your centre punching an outer pipe to attempt to press it tighter against the inner to stop a rattle when cold.

 

[Spartacus]

yes but where on the exhaust ?

 

[allandwf]

If the drawing shows 4 pipes entering then it must be immediately after, or at the bottom, of the manifold I would think. Does it not then exit in one large pipe from cat?

 

[richard_masa_4200]

I think I have this problem and will be attempting the 'punch' fix tonight. For those that did not understand the diagram that was put up in an earlier post, have a look at the attached photos and I think you will get a better idea of what we are dealing with. You can even see the 'factory' punch spots. This is not my exhaust, I just found these photos while doing my research.