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| Jaguar XJS V12 racing car |
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| dawesy:
Ouch. Hope it's all repairable. On the cleaning front I use Swarfega oil and grease remover (£9 for 5ltrs at B&Q) Works wonders on baked on grime and doesn't really smell of anything unlike the solvent based products |
| edward:
I am probably being totally ignorant of something obvious here, but how in hell does a spring washer end up inside a piston - has it been there since build? |
| RussellT:
Well if there are washers under the heads of air filter housing mountings they can be sucked in. It happened on one of my cars (a long time ago) on the A1(M). It made a dreadful noise. I got it towed off the motorway and took the head off on a garage forecourt to extract the washer. I'm following with interest Ade. :clap: :thumbup: Russell |
| edward:
interesting. I'm amazed there is space for it to fit, but then I guess for good gas flow the spaces should be big! Something about the A1(M). Years ago the timing belt on my old faithful 1992 Astra estate went ping while I was in the outside lane there - a real brown trouser moment as it was busy and I had limited momentum!! Ade - you are mad, but in a good way:) |
| AdeV:
The pre-HE V12 actually has quite a large space (0.150" at TDC) between the top of the piston and the head, so there's room for the washer to sit in there & fly around the place. All the dings are half-moon shaped, so it's obviously when it's landed edge-on that it's done the damage. Given that the heads were relatively easy to remove, I'm thinking they've been off before - probably not that long ago in mileage terms. I'm also thinking they re-used the head bolts, judging by how well held in they were by comparison... I imagine the washer got in the last time any serious work was done on it. If you leave the inlet manifold on on a normal Jag, it's almost impossible to get anything into the cylinders; if you take the manifold off, it's almost impossible to keep stuff out! Apparently, Jag V12s are prone to dropping valve seats if they're overheated (being an interference fit), but because there's so many cylinders and so much sound deadening in the cabin, all that can be heard is a faint tinkling sound - even though the seat is being beaten to a pulp by the valve... |
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