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Start it up, hold a card against the end of exhaust pipe, the pressure should hold the card away, however if the card is pulled back against the exhaust now and then, you have a burnt valve, most likely exhaust valve.
If there was a hole in the piston or top of piston broken off, there would be huge blowby, A broken plug or a broken glo plug can cause bent valves
Cheers, the ferret.
these are belts. have checked all belts and their fine.
Last service was 10k ago
First thing, check timing and rule that out.
Cheers, the ferret.
A small piece of broken piston flying around will make a hell of a racket.
But check timing , do all the simple things first,
Could even put some vacuum gauges on to see whats up
BTW what motor and how many Ks on the clock
Its a TB42 carbie and its just ticked over to 280 000.
Hope its nothing major, 2nd hand motor would be cheap if its no good
Would timing really be an issue making that big racket? means i have to but everything back together enough to start the car then take it all apart again. Is it worth my time? if it is i'll do it, but i don't want to have to keep assembling the car and taking it apart again. id rather just go the whole hog and take it all apart till i find whats wrong with it.
Now, how far down into the engine can i go before i should fully remove it to work on it? and if i can keep it in the car, how far can i go down before all the fluids have to come out and fuel lines need to be plugged ect...
First check timing and timing components, then do compression test, this will tell you where to look.
If it's a valve problem the motor can stay in.
Other than that, it's easier to work on it on the bench.
If the head needs to come off, drain water and oil.
The engine has a valve problem by the sound of it when starting.
Cheers, the ferret.
Thanks for that ferret,
what sort of compression should i be expecting? cant seem to find it in the service manual or im not looking for the right thing.
Don't worry about optimum (130 to 175 PSI) cranking pressure at the moment, just do a compression test and see if each cylinder has the same or within say 5 or 10lbs, I feel you will find one cylinder has a VERY low reading..
Cheers, the ferret.