Good fuel? Not accidentally mixed with a small amount of diesel?
On 10 Jun 2012, at 19:07, "Susan and Martin Scott" <susanandmar...@corringham99.free-online.co.uk> wrote: > As the plugs are clean should the valve stem seals be suspect? > Could it be getting through the turbo into the exhaust? Could it be that it > is actually smoking on boost but not as visible? > Just some thoughts... > > > ----- Original Message ----- From: "barnacle" <nailed.barna...@gmail.com> > To: "Quantum Owners Group" <quantumowners@googlegroups.com> > Sent: Sunday, June 10, 2012 6:00 PM > Subject: [Quantum Owners] Fiat 20vt quantum smoke issue... > > > Scratching my head on this one... couple of weeks ago the 20vt 2+2 > passed its MOT after a lot of work rebuilding the brake and clutch > master cylinders, dropping in a new turbo, and rebuilding the inlet > ducting. > > Two hundred miles later it started smoking. Not a mild 'just a couple > a day' but a full sixty a day habit, the sort that makes passing > policemen raise an inquisitive eyebrow and makes people wait thirty > meters behind you at the lights. > > It smokes on idle. It smokes on overrun. It smokes on gentle running. > It *doesn't* smoke on boost except momentarily at the start of boost. > > Today I have (with the very welcome assistance of Joe, who's an expert > on these engines): > > - pulled the inlet plumbing from the turbo: clean > - pulled the exhaust plumbing from the turbo: clean > - checked the turbo shaft for bearing wear/movement: nothing > - checked the turbo actually turns: yup > - checked the lambda sensor: clean > - replaced the positive crankcase ventilation valve with a block (it > was leaking *slightly*) > - tested for pressure from the oil filler: none > - checked the oil for water and the water for oil: none > - checked all five sparkplugs: clean > - checked the compression (cold/dry) on all five cylinders: 150psi +/- > 5psi = well within spec > - cursed the engine quite comprehensively, including the sacrifice of > a chicken or two > > There is absolutely no evidence of oil being burnt in the engine apart > from the fact that it's a mobile smokescreen... > > The next thing is to drop a new head on it. All we can think of now is > the valve stem seals (cracked piston, rings, or valves seem excluded > by the pressure readings) and this is not a fault for which this > engine is renowned - I know of perhaps three cases in fifteen years. > > What have we forgotten? Any other thoughts? > > Ta, > > Neil > > -- > You received this message because you are subscribed to the Google Groups > "Quantum Owners Group" group. > To post to this group, send email to quantumowners@googlegroups.com > To unsubscribe from this group, send email to > quantumowners-unsubscr...@googlegroups.com > For more options, visit this group at > http://groups.google.com/group/quantumowners?hl=en > > IMPORTANT NOTE: All information presented herewith is provided on an "As Is" > basis, without warranty or the implication thereof. Neither the Quantum > Owners Club nor the individuals associated with the Quantum Owners Club or in > the preparation of the above information shall have any liability to any > person or entity with respect to liability, loss, or damage caused or alleged > to be caused directly or indirectly by the instructions contained within this > or related message(s). > > > ----- > No virus found in this message. > Checked by AVG - www.avg.com > Version: 10.0.1424 / Virus Database: 2433/5060 - Release Date: 06/10/12 > > > -- > You received this message because you are subscribed to the Google Groups > "Quantum Owners Group" group. > To post to this group, send email to quantumowners@googlegroups.com > To unsubscribe from this group, send email to > quantumowners-unsubscr...@googlegroups.com > For more options, visit this group at > http://groups.google.com/group/quantumowners?hl=en > > IMPORTANT NOTE: All information presented herewith is provided on an "As Is" > basis, without warranty or the implication thereof. Neither the Quantum > Owners Club nor the individuals associated with the Quantum Owners Club or in > the preparation of the above information shall have any liability to any > person or entity with respect to liability, loss, or damage caused or alleged > to be caused directly or indirectly by the instructions contained within this > or related message(s). -- You received this message because you are subscribed to the Google Groups "Quantum Owners Group" group. To post to this group, send email to quantumowners@googlegroups.com To unsubscribe from this group, send email to quantumowners-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/quantumowners?hl=en IMPORTANT NOTE: All information presented herewith is provided on an "As Is" basis, without warranty or the implication thereof. Neither the Quantum Owners Club nor the individuals associated with the Quantum Owners Club or in the preparation of the above information shall have any liability to any person or entity with respect to liability, loss, or damage caused or alleged to be caused directly or indirectly by the instructions contained within this or related message(s).
