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Smaky · 01-08-2008

Originally Posted by symonh2000

That is seriously worn

I will be interested to know what the noise is for sure when you find it.

I know it is unlikely but I don't suppose it could be the thrust bearing on the gearbox end of the crank could it? This might allow the crank to vibrate at certain RPM.

Now we had that thought, and by doing the clutch test, hopefully eliminated that as an option, Whilst the clutch was depressed (forcing the flywheel to the right) the noise was exactly the same, completely no variation to it. The only thing I can really say the noise is like is big end knock, but to not have it anywhere else in the rev range rules out the big ends, I'm hoping it is the balance bearings on the rear shaft (not that it's an easy job... engine out or leave belt off...Mmmm??) but there is still the option of piston slap with broken rings. This really is the first time a snag hasn't jumped out and been obvious.

I'll get some better pics of both cams, they really are the worst ones I've ever seen, just aswell there was a spare 1.8 TS in the corner.

BTW this is a mint black 2.0 TS Cloverleaf 145 we're trying to keep on the road here. Really don't want it to die.

01-08-2008	#10 (Post Link)
Smaky Club Member Club Member Number: 592 Join Date: Feb 2008 Location: United Kingdom Posts: 3,450 Member car: 155 rip, 146, 159Ti rip	Re: Chatter at 2500 rpm Originally Posted by symonh2000 That is seriously worn I will be interested to know what the noise is for sure when you find it. I know it is unlikely but I don't suppose it could be the thrust bearing on the gearbox end of the crank could it? This might allow the crank to vibrate at certain RPM. Now we had that thought, and by doing the clutch test, hopefully eliminated that as an option, Whilst the clutch was depressed (forcing the flywheel to the right) the noise was exactly the same, completely no variation to it. The only thing I can really say the noise is like is big end knock, but to not have it anywhere else in the rev range rules out the big ends, I'm hoping it is the balance bearings on the rear shaft (not that it's an easy job... engine out or leave belt off...Mmmm??) but there is still the option of piston slap with broken rings. This really is the first time a snag hasn't jumped out and been obvious. I'll get some better pics of both cams, they really are the worst ones I've ever seen, just aswell there was a spare 1.8 TS in the corner. BTW this is a mint black 2.0 TS Cloverleaf 145 we're trying to keep on the road here. Really don't want it to die. Anonima Lombardo Fabbrica Automobili - RSVP WILL WORK FOR hic BEER!!! (chits) 9/10 people enjoy????? .... Gang Rape!