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Old 29-09-12, 05:11 PM   #1
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Default 306 - cam belt failed, head off, cam broke, How to assess valve damage?

hi,

I've been spending some (too much) personal time with my son's 306 1997 non-turbo XUD diesel.

The timing belt failed.
Rocker cover off revealed broken cam in two places.
Head off reveals light marks of valve to piston contact for 5 valves.
Vacuum pump driver dog has shattered? (i suppose this may have already been so... or even the cause of the belt failure).

Valves are flat against head, only one was sticking out a little bit. After removing the cam, all have settled very nicely into the head.

I've read a lot about bent valves. If valves are bent, is it blindingly obvious, or do I HAVE to remove the affected valves and really check them finely?
What's the chances that the 5 affected valves all survived as straight, given the camshaft failure?

If I get a cam kit from ebay, will it fit easily, or are there complications?

(I could get a 2nd user head, but as the damage does not appear that bad and I'm VERY short on cash, I'm so tempted to repair this one).


Simon
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Old 29-09-12, 05:22 PM   #2
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just read of someone testing for valve seal by pouring liquid behind the valves. I'm guessing that if I pour diesel into each port, and leave to soak, i'd see any valves which were not sealing by a stain appearing on the face of the head?
Any thoughts?
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Old 29-09-12, 06:18 PM   #3
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your most likely find it cheaper/easyier to buy a new / exchange head already assembled dealers are doing them on exchange basis and also other recon engine places or head off ebay etc , it will need most likely all the valves and might also need valve guides and as for the cam kits wouldnt recomend it...shimming the valve clearances isnt really easy either if youve never done it before.
good luck
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Old 29-09-12, 06:47 PM   #4
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he he. yep, done shimming before on a lotus twin cam.. not nice when the thinnest shims available are not thin enough 'cos the engines had that many rebuilds. Had to have some surface ground to get it right.

I did the fluid test with diesel on inlets only initially. At least one let the fuel through easily, so I'm with you; 2nd user head if I can find one anytime soon; Anglia Peugeot offered one for reasonable money, just got to see if they have one on monday.

If anyone has one in suffolk, let me know

Simon
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