Mungler Posted May 23, 2011 Report Share Posted May 23, 2011 Got a client that has bought a second hand Jag diesel (twin turbo). Less than 7 years old, 95k on the clock. Broken crank shaft - any ideas what could cause this? Cheers all. Quote Link to comment Share on other sites More sharing options...
kdubya Posted May 23, 2011 Report Share Posted May 23, 2011 for a crankshaft to simply break, it could be a defect within the crankshaft itself, that has finally "shown" with age and wear,or its been starved of oil? if say a piston had seized and led to a crabkshaft failure then considerable damage would have been done to the rest of the engine probably totalling it, I would have thought that a crankshaft simply breaking was quite rare, but then again I once had a piston crown come away from a fairly new and well serviced car engine? KW Quote Link to comment Share on other sites More sharing options...
Dougy Posted May 23, 2011 Report Share Posted May 23, 2011 If its not ballanced correctly in the first place,or the bearings are shot out. just a guess as i aint no spanner expert Quote Link to comment Share on other sites More sharing options...
Gordon R Posted May 23, 2011 Report Share Posted May 23, 2011 Has the crank just sheared or is there damage to the big end and main bearings? Quote Link to comment Share on other sites More sharing options...
gixer1 Posted May 23, 2011 Report Share Posted May 23, 2011 On all the broken cranks I ever saw it was usually a defect in the cast, I once saw a defender drive into the workshop with a con rod sticking out of the block...fairly impressive! Is it a ford V6 engined jag? Quote Link to comment Share on other sites More sharing options...
Ricko Posted May 23, 2011 Report Share Posted May 23, 2011 Rather than the cause, the solution or alternatives are what I would like to hear. It really could come down to quite a huge list of reasons, x-raying the break may show where the stresses have been met? Quote Link to comment Share on other sites More sharing options...
Cosd Posted May 23, 2011 Report Share Posted May 23, 2011 (edited) Mungler A friend of mine works at Burton car racing, is an exceptional mechanic, and the only modern car he loves is a Jaguar; if you can't get to the bottom of it and want to have a chat with him send me a pm and I will put you in touch. Cos Edited May 23, 2011 by Cosd Quote Link to comment Share on other sites More sharing options...
drut Posted May 23, 2011 Report Share Posted May 23, 2011 "Don't forget also the diesel Jag has the same engine albeit with the twin turbos." http://www.disco3.co.uk/forum/topic55170-15.html http://www.rrsport.co.uk/forum/topic7731.html The above threads may be of some interest to you I hope. Quote Link to comment Share on other sites More sharing options...
Mungler Posted May 23, 2011 Author Report Share Posted May 23, 2011 We are at the point of getting an expert's report - there is a supplying 2nd hand car dealer and an intervening garage that carried out a service. Each is blaming the other. Client had car for less than 4 weeks (week 2 had it serviced). Less than 100 miles in the 4 weeks. Intervening garage knows what it is doing. As above, one way or another the client had a reasonable expectation to have a vehicle that was of satisfactory quality, free from defects and durable etc and it's one of the garages' at fault. I was hoping to avoid getting an expert's report now because the Court will probably Order another report being comissioned "jointly" once proceedings are underway. I don't think I can avoid it, so, anyone know of any diesel jag engine crankshaft experts? Am interested in the Burton fella - will PM. Quote Link to comment Share on other sites More sharing options...
88b Posted May 23, 2011 Report Share Posted May 23, 2011 A lot of modern diesels with common rail systems suffer from injector problems from 70K miles onwards, was it running OK before it broke ? just wonering if it hydrauliced although I'd have thought it would bend a rod rather than shear the crank. If the car was in an accident that can weaken cranks. Quote Link to comment Share on other sites More sharing options...
VicW Posted May 23, 2011 Report Share Posted May 23, 2011 - there is a supplying 2nd hand car dealer and an intervening garage that carried out a service. Doesn't the 'Sale of Goods Act' or something similar say that any defects,other than fair wear and tear,that become apparent within six months from the sale, are deemed to be present when the vehicle was purchased and that the selling dealer is liable for the cost of repair? Vic. Quote Link to comment Share on other sites More sharing options...
Mungler Posted May 23, 2011 Author Report Share Posted May 23, 2011 Not if the garage that serviced it in the interim broke it. Quote Link to comment Share on other sites More sharing options...
Budice Posted May 23, 2011 Report Share Posted May 23, 2011 Broken or damaged dual mass flywheel if fitted? Quote Link to comment Share on other sites More sharing options...
kdubya Posted May 23, 2011 Report Share Posted May 23, 2011 Not if the garage that serviced it in the interim broke it. just about everything else should fail before a crankshaft, if bearings had failed or it had been hydrauliced etc cranks would have bent or snapped long before a crankshaft snapped, my money is on an initial defect in the crank, can't see what a service could have done to cause a crank to fail, even running out of oil would have seized the engine first before a crank failed, or timing done wrong etc would have had valves and rods suffer 1st KW Quote Link to comment Share on other sites More sharing options...
Nial Posted May 23, 2011 Report Share Posted May 23, 2011 just about everything else should fail before a crankshaft, if bearings had failed or it had been hydrauliced etc cranks would have bent or snapped long before a crankshaft snapped, my money is on an initial defect in the crank, can't see what a service could have done to cause a crank to fail, even running out of oil would have seized the engine first before a crank failed, or timing done wrong etc would have had valves and rods suffer 1st I agree, A previous owner could have red-lined and dropped the clutch at every light. And **** does just happen some times. Nial. Quote Link to comment Share on other sites More sharing options...
Mungler Posted May 23, 2011 Author Report Share Posted May 23, 2011 Cheers chaps, this is helping, keep the commentary coming. I am more hoping to show that there was nothing that the intervening garage (who carried out the service) could have done that would have caused the failure. Quote Link to comment Share on other sites More sharing options...
ST3V3 Posted May 23, 2011 Report Share Posted May 23, 2011 (edited) here's another and another Edited May 23, 2011 by ST3V3 Quote Link to comment Share on other sites More sharing options...
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