chapterone said:
Cheers woz, wow can see why regrinding really isn't an option, those tolerances are tight!
Re; your reply above, that is why you must be very careful 'polishing' the crankpin.
Introducing any excess clearances, or wear for want of a plain description must be avoided, these engines DEMAND close fitting big ends!
I am NOT trying to teach anyone to suck eggs, OR knocking any good engineers out there, but it needs to be said.
Forget thinking the YD25DDTi is just another diesel engine!
These engines, thanks to cost cutting morons in Nissan and Renault built these engines (and still do (single row timing chains in the D40's!) with latent catastrophic defects, from new they are like time bombs waiting to explode.
Whoever rebuilds these engines MUST know them inside out and NOT cut any corners whatsoever.
If(?) built correctly the D22 will be a reliable joy to own (very little else goes generically wrong with them), but if corners are cut and they are put together incompetently, or with cheap parts, they are little better than when new, and will let go, sooner rather than later.
There is plenty of evidence on here to back this statement up!
Respectfully, I would suggest you spend and evening just reading through the threads on 'blown engine', 'engine modifications' etc etc, have paper and pen handy to write down relevant information, part numbers, contact details etc.
Learn as much as you can about this problem and pass this information onto your engineers.
IMHO, I have said this before but I would fit the original end shells I sourced some 7 years ago, the ones that need the tangs filing (any engineer is more than capable of this) this will give you nearly 1mm more bearing width (on an already skinny bearing!), as they say "every little helps"!
Always remember that the crankpins on these 2.5lt, turbo charged diesel engines are identical in size, to a 1.4lt normally aspirated petrol engine that ceased production in 1970!
For that is where (with the excellent help of Bruce Williams at ACL) we discovered the lead/copper bearings that would fit this engine.
As before NO offence intended to anyone, just trying to offer hard earned knowledge.