Ok dudes, ive just registered and wondering if anyone can give some idea as to what might be ******* with my engine, car was running sweet but after giving someone a shot the car cut out and died, apparantly after doing upwards of 100mph, we got car back home (took out fuse 19, towed it about 1.5 miles) its getting spark and seems to be getting fuel so got hold of compression tester and nothing, im thinking probly all 16 valves would be bent, some ppl told me that it could be the hydraulic tappets but am not 100% convinced. I thought id ask u guys cos i know there are quite a lot of boys on here know there stuff.!!
P.S ive heard enough about giving ppl shots of cars but whatever is wrong will be getting fixed - the car is too good!!
Any help much appreciated!, also any gen of price!?
If you have no comp at all then you have a big problem. If your sure you have no comp then i'd be taking the head of for inspection,like you say it could well have done the valve in. That sounds most likly as i cant see it bloing holes in all 4 pistons at the same time.
Do a quick check on the timing marks before whipping the head off.
Checked timing, all marks spot on, saying that it was a friend who checked compression but dunno if he tested every cylinder? It spins over easily and u can pretty much hear there is no compression!? could overrevving bounce the valves? Looked into bores thru plug holes cant see any obvious piston damaged, used a plastic rod and spun it about by hand (moved it inside bore)but nothing feels worng, really need head off to see but vauxhall wont touch it if it has been tampered with eh? i want a comeback if its not built up right!
How long were you running at high (100+) speed?? Just wondering if something like the piston rings are gone or something (although even then I'd expect just a tiny amount of compression). After all, high speed/rpm turbo action will cook everything quite nicely.
Has it been blowing any oil out of the exhaust or through the oil breathers at all??
Car has 80k on clock, no smoking or any signs before this happened, has had new turbo fitted not to long ago, engine was perfect before, smooth and pulled well, i never thrashed it but then i dunno how it was driven when it died, but apparantly there was no noise, he thought the worst and clutched it as soon as he felt it die..........
Sorry, in the middle of nowhere in scotland! - Really think it needs head off to tell, just wondering if anyone could give a rough guess how much vauxhall would charge for replacing all 16 valves if that is the problem? Cheers
Car has 80k on clock, no smoking or any signs before this happened, has had new turbo fitted not to long ago, engine was perfect before, smooth and pulled well, i never thrashed it but then i dunno how it was driven when it died, but apparantly there was no noise, he thought the worst and clutched it as soon as he felt it die..........
I doubt all 16 valves and rocker and lifter systems have suddenly all stopped working. Piston rings is feasible. Or cooked/worn valves.
This is not a suggestion, more a question to others, but can one squirt some oil into the chambers through the spark plug hole to lube inside the chamber and try and coax a little compression out of it???
Boost gauge reads (or used to) 5 psi after boosting to 8 or so for a second, (if u give it throttle gauge boosts to about 8-10 then drops to 5ish and holds at about that til u change gear or let off) Was going to try the oil test but havent been back down to the car today. Is it likely all cylinders ring could go at same time?
not really, if i was you id try another compression test, its unlilkly to have 0 compression on all 4 cylinders, also wasnt even running standard boost going off your readings there.
If the engine has no compression on one or more cylinders the valves are bent on that cylinder, wore rings or bores will still show quite a high reading.
Normaly if the belt is still on it and the pulleys are in one piece, I would say that the bottom pulley has spun on the crank, but if this was the case the timming marks would not line up.
If this has happened it is possible to bend all sixteen valves.
Most Vauxhall dealers will not repair, they will inform you that you need a new engine, (that way they get a warranty from the factory on the parts fitted)
Even so it is quite an easy (although labour intensive) repair if you have the correct tools and equipment.
It might be woth looking for a replacement head but if on a turbo needs to be as near original thickness as possible.
This is not a suggestion, more a question to others, but can one squirt some oil into the chambers through the spark plug hole to lube inside the chamber and try and coax a little compression out of it???
There is of course the other possibility of a major head gasket failure somehow affecting all cylinders, but with something that bad I'd expect mixing of water, oil, and general mess.
Is there any strange noises when cranking? Possibly a snapped cam? not letting air in for the compression tester?
Is the tester any good? Try it on a working car, otherwise with a plug out, try cranking it and feel if there is any pressure coming out, you should feel air movement.
It does seem strange to go from working, to no compression if your camblet is all lined up - are the cam pullies tight, along with the crank pulley? Are the pistons moving, with the car in gear, and plugs out, walk the car forward, do the pistons move up and down (doubt it but possible snapped crank?)?
Other things come to mind such as oil starvation, etc.
At higher RPM if the flow isn't enough through the filter that's just tough luck and if the oil was well used or low that could have been a factor to helping things like piston/bore wear.
Cheers for all the replies guys, not been able to get online til now, stripped car down and turns out all 8 exhaust valves got bent, head is already away to be fixed, got a price of 350 all in and thats for all 16 valves and gaskets etc, just doesnt cover timing belt and pulleys but thats not overly bad a price is it, at least il have some comeback on it, also i see that my engine has plastic pulleys where my gsi had metal ones, can these be swapped and is this advantageous at all, (i will be buying a timing belt kit) there are 2 choices would one be metal pulleys and one plastic or is it the tensioners that would be different? Cheers again tho!
sounds like very sensible advice RS1, the pulley (idler) under exhaust cam on my engine had some marks id imagine slight bits of belt, wasnt really unsmooth but aint taking chances so replacing them, i dont like the idea of plastic pulleys either! - Also and this may be a scary point, i noticed that on piston 4 there is a very small part at outer edges missing(broken off) maybe only 1mm by 1mm, it isnt a sharp edge and the bore is unmarked, will it be safe enough to leave this piston in place or should i replace it? i have checked thouroughly for any other damage and this seems to be the only bit, the missing part was stuck on one of the bent valves, is it safe to just try smoothing it out so that it is no likely to become a hot spot? any advice much appreciated (am hoping it will be ok as dont really want to take it apart anymore than it is if i dont have too?
have not removed crank sprocket yet, will do just to make sure but we are pretty certain it would have been caused by over-revving think it was actually going into 4th at 120ish? A lesson for me to keep my cav turbo to myself from now on i thinks!! It was the keyway that done all 16 valves on my cav gsi so will remove sprocket to be certain but timing marks are bang on, (with my gsi the crank turned inside pulley/sprocket, but on my turbo the belt and all pulleys move so thinking its just down to over-revving?)
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