Its gone bang

[hopkinsgm]

...the timing belt is a bit loose though, so i can only assume that it has taken some of the teeth off or something...

It's not unheard of for a timing belt to jump a few teeth - which throws valve opening/closing out of synch with crank rotation. Upshop being that a valve can be open when the piston comes up and that's when things start getting messy (and expensive).

 

[Red Ibiza VR6]

and with 4 valves per cylinder, it doesnt have to be many teeth out to bend a valve. If so, Id get a Golf KR 16v head, get it skimmed for 20quid or so and bolt it up. Cheap fix and a bit more torque

 

[alimac81]

I wasnt driving fast when the belt went, only doing 30 and wasnt putting the engine under load, i had a look with a torch at the top of the valves when i took the intake manifold off and couldn't see anything wrong (having said that i couldn't see much of the valve in the first place ) Soon find out if its bust, getting the timing reset up on wednesday, have to hope for the best. Does anyone know how often belt tensioners go?

 

[m0rk]

should replace well before 60k

 

[alimac81]

Was last replaced at 60k, so this one had done 40k, so i should have had time to do it, shite happens

 

[alimac81]

should replace well before 60k

Is that the belt tensioners?

Cheers

Ali

 

[m0rk]

and belt

but like you say - **** happens & sometimes stuff just buggers up

 

[alimac81]

Had just ordered the belt from vw but might get tensioner as well now, just in case

 

[m0rk]

belts are like £8, tensioners are more like £30

but worth doing!

 

[hopkinsgm]

If you're doing the belt, you might as well do the tensioner while you're at it. I've heard many different versions from different main stealers as to what Seat's official policy is, which all seems a bit odd. Some say that the tensioner should be done every 2nd belt change, so say do the tensioner every time as it only adds about 10 or 15 minutes to the job. The oddest version I heard was that the belt should be done every 60000, and the tensioner every 90000

Better to err on the side of caution IMHO. Small pain in the wallet in the short term is far better than a large pain in the wallet long term.

 

[alimac81]

True, still should find out tomorrow what caused the belt to fail, be it old age, belt tensioner, or somthing seazing im still worried the camshaft seized after i changed the grade of oil to 5w -30w full sinthetic

 

[alimac81]

Took the engine apart today, found two sets of inlet valves were mullerd, the valve guides on two of the valves are going to need replacing as well, shouldnt cost much.

Humm there is a chance i could refit these valves

 

[ibiza_95]

check for even slightly bent valves too. i had same problem once and there were a couple which were oh so slightly bent wich had to be done, then they had to be ground in

 

[alimac81]

Yeah had a look for some of them, checked the piston heads too, to look for evidence of valve strikes, looks ok, pricing up the fix on monday.

 

[hopkinsgm]

Bad luck fella, though tbh it was pretty much inevitable you were going to find some internal damage. Are the valve seats OK? Piston faces damaged? Were both damaged inlet valves in the same cylinder?

 

[cordobabrendy]

kr head could be cheaper all round mate if you can source a complete one, usually around 100 quid.

 

[WeeJase]

£6.50 for an inlet, £6 for an exhaust valve
cam follower £6.50
valve guide £2
cylinder head bolt £2

New cam chain, cam belt, cam tensioner
Head gasket

at that price i'd re-new the lot,may not "look " bent by eye.

 

[alimac81]

True, i was thinking about getting a new cylinder head, and reconditioning the old head in my spare time, maybe get it ported and polished and get some crazy cams fitted, but apart from the 2 sets of damaged inlet valves, it all looks ok, the piston faces were spotless, (apart from where it had struck the obvious damaged valves ) so for now i will find out how much it will cost to get the bits for the old head, and how much it will cost to replace the valve guide. if i see a decent second hand head for sale, i may swipe it and shove it on my engine