BC1963AD
Registered user
Thanks for your responses. Woke this morning feeling very pleased to wake this morning!
Went up to Bahnstormer - have to say that hey have been interested and helpful - and watched while they did the initial strip down on my bike. Essentially this was the work that we have agreed would be carried out today before the problem yesterday - the removal of both rocker covers to inspect the cam chains. Obviously no benefit now to tightening the loose bolt!
So, rocker covers off ...
Left bank appeared absolutely fine.
Right bank - cam chain had snapped and was visible, but firmly lodged in the gearbox.
One link had settled on a ledge in the cylinder head - looked that is was likely the one that had given way as the pins were bent apart. On the broken link there were obvious signs of wear on the end of the pins, but, from the visible part of the chain, there was no heavy scouring on the 'blind side' rear facing plates - those that you would not be able to see from the oil filler opening - but the pin heads did look worn.
On my bike the starter motor bolt had worked loose, been tightened to the extent that this was possible without removing the starter motor and had worked lose again by about half a turn. Significantly I could see no marking on the gear that this bolt would appear to provide the axis for. In fact looking at the way the chain runs in guides, I could not see how the gear could contact the chain. I might be wrong, but it could well be that the hypothesis that this loose bolt adjacent to the starter motor is abrading the cam chain and causing failure is incorrect. There was no obvious sign of anything being damaged .... other than the chain.
Now with the dealer to submit PUMA report to BMW and come back to me. I have every confidence that this will happen quickly and that BMW will come up with the right solution.
My only prerequisites are that I have total assurance that whatever caused this failure in this engine has been rectified - not interested in taking a chance on it happening again - and that I am not financially disadvantaged as a result.
Fingers crossed!
Went up to Bahnstormer - have to say that hey have been interested and helpful - and watched while they did the initial strip down on my bike. Essentially this was the work that we have agreed would be carried out today before the problem yesterday - the removal of both rocker covers to inspect the cam chains. Obviously no benefit now to tightening the loose bolt!
So, rocker covers off ...
Left bank appeared absolutely fine.
Right bank - cam chain had snapped and was visible, but firmly lodged in the gearbox.
One link had settled on a ledge in the cylinder head - looked that is was likely the one that had given way as the pins were bent apart. On the broken link there were obvious signs of wear on the end of the pins, but, from the visible part of the chain, there was no heavy scouring on the 'blind side' rear facing plates - those that you would not be able to see from the oil filler opening - but the pin heads did look worn.
On my bike the starter motor bolt had worked loose, been tightened to the extent that this was possible without removing the starter motor and had worked lose again by about half a turn. Significantly I could see no marking on the gear that this bolt would appear to provide the axis for. In fact looking at the way the chain runs in guides, I could not see how the gear could contact the chain. I might be wrong, but it could well be that the hypothesis that this loose bolt adjacent to the starter motor is abrading the cam chain and causing failure is incorrect. There was no obvious sign of anything being damaged .... other than the chain.
Now with the dealer to submit PUMA report to BMW and come back to me. I have every confidence that this will happen quickly and that BMW will come up with the right solution.
My only prerequisites are that I have total assurance that whatever caused this failure in this engine has been rectified - not interested in taking a chance on it happening again - and that I am not financially disadvantaged as a result.
Fingers crossed!
