shantybeater wrote:Definately get a second opinion. A missfire and rattle could be a alot of different things...How prominent is the rattle? do you have any vids/sound clips?
hornel Z3M wrote:hi Desiro. Sorry to hear about your problem. can you say why you drove 300 miles with a blown tip off the plug, or did you not know then?
Deano1712 wrote:I can't see how a conrod bolt can 'stretch'. More likely they would fail and you would have catestrophic engine failure. You would only get a problem with the rods if the engine had been over-revved. Do you think it ever has been?
Deano1712 wrote:REALOEM shows an anti-rotation feature so it looks like its impossible for the shell to rotate anyway!
Desiro wrote:I can borrow an endoscope from work, but not until next week so I can have a look down the plug holes for damage.
I supose i could look up through the sump via the sump plug too. not sure Quarry motors would let me do that on thier premises though.
do you think there is any merit in having an oil sample analyzed, we use a company at work called scientific services who do gearbox oil sampling for us.
Thanks for your continued support.
offyourmarks wrote:Have Quarry motors divulged how they came to their diagnosis?
They seem to have a good reputation normally
exdos wrote:I'm sorry to hear your trouble. I had a catastrophic bearing shell failure on my S54 MC 2 years ago and the noise sounds like those "clackers" toys (as seen in the 1970s) when it starts and is obviously related to the revs.
I've also witnessed a spark-plug failure on another S50 MC and heard of a few other spark-plug failures too. If you've been lucky, the bit's will have blown out of the cylinder and they'll be safely trapped in front of the cat. You can check the affected cylinder and piston for damage with an endoscope and also see if the bits from the spark plug have exited the cylinder. A compression test is easy to do and will show if the affected cylinder has lost compression by comparison to the other cylinders.
If you can eliminate damage from the cylinder, then get the car up in the air and follow 6 pot Roadsters advice of "Get a long metal bar and use it as a listening stick, holding one end to the engine block as close to each bearing as you can actually hear the bearing (it also works for camshaft lobes and water pumps) a healthy bearing should just sound like an engineering whirring noise and a worn one will of course 'clack'." If you then need to investigate further, drop the sump and take a look at the bearing shells, with the view to preventive replacement if you find them to be OK, but if they're damaged then you need to assess the state of the crankshaft etc. and you can work out your options of repair or replacement.
freelandm wrote:Hi Desiro
Sorry to hear this it has happened to me following an oil change unscheduled as well.,mine made the noise when the motor got 3-4k on it and it turned out to be number 5 bearing that had failed no other damage apart from 600 quid to my pocket for re shelling etc.
I see you are only down the road if you need a 2nd opinion go and see the boys at Bavarian motor warehouse in Huddersfield cannot recommend enough, they did my car and diagnosed in about 10th seconds.
Good luck with it.
gookah wrote:ok, we have seen the physical damage, now what we want to know is, what the real 'damage' was .
pingu wrote:No damage to the bore or cyl head?
The bit of debris looks bigger than the chip out of the piston.
If I had the engine that stripped, I would have balanced all the components +/- 1g (BMW tolerance is +/- 5g). Do Geoff Steel offer that service? I know they do performance upgrades as I have them bookmarked ready for a performance clutch next year.
c_w wrote:So just to clarify was the original diagnosis wrong (and also the thread title)?
And the damage to the piston was caused buy the spark plug debris? (and the source of the noise?)
and new shells/bolts fitted as a precaution whilst the piston was replaced?
Deano1712 wrote:Can you let us know what caused the problem?
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