Ashy
26-03-2011, 19:12
Hi... Right any advice on my little problem...
Following on from THIS (http://www.rtoc.org/boards/showthread.php?t=20997) thread I've fitted a new engine (of unknown origin, I rebuilt it about 4 years agn but can't remember what I replaced or why). I did a leak through test with petrol in the bores before fitting and it was spot on. Clocked the head for flatness and used an uprated gasket.
So First I ran it with the original turbo and it smoked badly so I got hold of a known good T2 turbo and fitted that. The smoking improved but it was't right so I stripped it and re-built it. The rear oil seal had compressed so i thought a new one would sort it. It was much better, only smoking on gear changes and idle, no smoke whilst cruising. But I wasn't happy so fitted the old T3 off my old 172 engine... I knew that was absolutely spot as I'd recently rebuilt it and it never smoked on the 172.
Anyway the flipping thing still smokes.
Ive done a compression test and I get 151psi +/- 1psi on each cylinder.
The breather setup isn't standard, the non return valve in the inlet manifold is blocked so It cant be sucking oil vapur back into the inlet manifold. Theres very little crank case pressure at idle and I've had rings wear out on me before and this is a different type of smoke.
The think is i have removed the core of a T2 and blanked the front off so I could run without a turbo and I didn't get any smoke at all...
So I'm now totaly confused... Am I just having a run of bad luck? Could all the turbos just be knackered? could I have too much oil pressure (seems spot on on the stadard gauge) I'm running out of Ideas.
Current symptoms are, it smokes a little on boost but then theres a puff of smoke as I change gear... Also sometimes smokes at idle, not always, but it will smoke then stop for no reason then start again.
What should I try next?
Cheers Ashy.
Following on from THIS (http://www.rtoc.org/boards/showthread.php?t=20997) thread I've fitted a new engine (of unknown origin, I rebuilt it about 4 years agn but can't remember what I replaced or why). I did a leak through test with petrol in the bores before fitting and it was spot on. Clocked the head for flatness and used an uprated gasket.
So First I ran it with the original turbo and it smoked badly so I got hold of a known good T2 turbo and fitted that. The smoking improved but it was't right so I stripped it and re-built it. The rear oil seal had compressed so i thought a new one would sort it. It was much better, only smoking on gear changes and idle, no smoke whilst cruising. But I wasn't happy so fitted the old T3 off my old 172 engine... I knew that was absolutely spot as I'd recently rebuilt it and it never smoked on the 172.
Anyway the flipping thing still smokes.
Ive done a compression test and I get 151psi +/- 1psi on each cylinder.
The breather setup isn't standard, the non return valve in the inlet manifold is blocked so It cant be sucking oil vapur back into the inlet manifold. Theres very little crank case pressure at idle and I've had rings wear out on me before and this is a different type of smoke.
The think is i have removed the core of a T2 and blanked the front off so I could run without a turbo and I didn't get any smoke at all...
So I'm now totaly confused... Am I just having a run of bad luck? Could all the turbos just be knackered? could I have too much oil pressure (seems spot on on the stadard gauge) I'm running out of Ideas.
Current symptoms are, it smokes a little on boost but then theres a puff of smoke as I change gear... Also sometimes smokes at idle, not always, but it will smoke then stop for no reason then start again.
What should I try next?
Cheers Ashy.