Vauxhall astra 1.4ls (91)

Hi group,my water pump bearings went on my astra which caused the cambelt to
snap.Have replaced pump,tensioner and belt but when started car,sounded like
it was misfiring.Took plugs out and examined them and every one had sooty
deposits,so i guess at least one valve has been damaged in each chamber!
Anybody tell me the best and cheapest thing to do next,don't want to scrap
it as it's a good car and have had no serious trouble with it during the 5
yrs i've had it.
P.S.
There's 130,000mls on the engine if that's any help,
thanks.

 

Is it the Vauxhall 1.7 - probably is if it's '91.
The rocker arms that operate the valves are designed to snap causing
minimal damage to the valves. Remove the cambox cover and see if any are
broken. I think they can be replaced without too much dismanteling.
If they are all intact you will have to do a compression test or a leak
down test to see which valves are faulty.
Dont forget to double check that the belt timing is correct and not a
tooth out either way.
It cost us £300 when the tensioner jammed/siezed on SWMBO Astra. All the
rocker arms broke. Engine otherwise OK except that the water pump
bearings were stuffed (that was 10K miles ago). The belt, by the way,
was well within it's 36K service life and the pump, tensioner were fine
at 72K. Belt broke at 85K and a year or sp later later.
Lesson? Replace belt and tensioner every 36K and fit a new pump at every
72K.

 

Most likely it has damaged a valve or two, but considering you managed to
get it started, I doubt if you've bent more than a couple. I assume it's the
14se engine, therefore it is within the scope of the more adventurous home
mechanic. If you decide to get it professionally repaired, shop around. A
figure of approx. £200 would be about right.