XJ XJ8 / XJR ( X308 ) 1997 - 2003

bought a xjr with bent valves

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Old 03-11-2013, 08:20 PM
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Default bought a xjr with bent valves

i am thinking about rebuilding it but havent been able to find a rebuild kit
valves
springs
retainers
piston rings and gasket sets

someone help
 
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Old 03-11-2013, 09:58 PM
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rebuilt kit? Just lap those valves, replace the bent ones and put her back together!
 
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Old 03-11-2013, 10:00 PM
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If you are thinking of a total rebuild you are in for a $hock- The bottom ends are pretty robust.

Top ends gasket set is available through partsgeek I paid around $300 including shipping with a coupon.
 
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Old 03-11-2013, 11:46 PM
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do you think that the pistons might have some damage or??
i rebuilt a few vw 1.8t engine and when valves bent there is no damage to pistons because they are forged
 
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Old 03-12-2013, 12:46 AM
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You will know as soon as you pull the head(s). More than likely no.
 
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Old 03-12-2013, 10:06 AM
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Check that each piston reaches TDC, because if a piston hits a valve it can also cause the con-rod to bend slightly as well as leaving marks on the piston.

This happened to me on an old BMW years ago. I had the head off to replace a couple of bent valves, but noticed that as I rotated the crankshaft to bring each piston to TDC for decoking, that the front piston was not reaching the same height as the others & was down by about a couple of mm-as well as looking like it was not sitting centrally in the bore.

Sure enough, after dropping the sump & removing the piston & rod from the top of the block, the con-rod was bent in a very slight dog-leg pattern.
 
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Old 03-12-2013, 10:15 AM
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Agreed- check with a depth gauge after you pull the heads.

Keep us updated- If I do not get my fix of auto repair successes I start looking at Craigslist. If I start looking at Craigslist I find projects. When I find projects I buy them. When I buy projects my wife gets annoyed. Please don't make me make my wife annoyed.
 
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