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Wrapping causes ex manifold to lengthen?


virden

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My 1996 X/F left the factory fitted with a 4:1 exhaust, which due to its constant blowing of the gasket   for ports 2&3 has been on and off many times without a hitch, the four pipes slotting through the hole in the body skin without difficulty.  This year due to my relocating the catch tank to that side I wrapped the pipes in heat proof tape and again refitted the system without a hitch, the pipes clearing the body hole by about 5mm as per usual.  I have since noticed a curved groove melted into the body skin just above the chassis rail and melted aluminium on no.3 pipe, but the clearance, when observed cold,  is still there.  So does this mean wrapping the pipes, thus keeping them out of a cooling air stream has caused them to expand and contract length wise more than before?

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Thanks guys, I have checked  both mounts visually and could not see anything odd, I then held and shook the rocker box vigorously resulting in the whole car shaking but the engine did not appear to move separately nor where there any clonking noises from broken bits.   How else do I check the mounts?

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I had these same symptoms on my VX and it turned out to be a broken (on a weld) LHS engine mount which put all the weight on the alternator strap and, not surprisingly, broke that too.  I would put a jack under the engine and remove the LHS mount and mounting rubber underneath and have a closer look at the state of both.  Also slack off the RHS mounting rubber bolts to give you room to work.

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 Hi all,

Apologies for late response to your suggestions, had BT broadband problems, AGAIN!.

The car was up on the ramps for its MOT (passed) where we had a good look at the engine and gearbox mounts all of which are OK

Jonathan, I haven't worked up a methodology for measuring the difference between hot and cold which does involve burnt fingers, my welding gloves being too stiff to hold a tape, but shall think on it.

IMG_1281.thumb.JPG.c3f13e2eb61047157fd93f675b10a8cd.JPG

A  bad photo, but you can just make out the melted aluminum sticking to the primary. and the skin has a melted edge.

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