V6 Crankshaft Scoring? - Alfa Romeo Forum
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V6 Crankshaft Scoring?

Hey just noticed on my crank a v shaped groove which is centred on the oil feed nearest the cambelt, its on one of the feeds but not on the one opposing it. The shells are fine no damage so i cant figure out what it is, maybe to aid oil flow because i can't see how it would have happened.
Any help or insight would be greatly appreciated.

Rich
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They all have that groove. Well, all the V6 cranks I have looked at have at least. Probably 10 or so?? Fair sample anyway

Confess I don't knowwhat it's for though. I'd take a guess that it's to extend the period that the crank gets a direct feed of oil from the pump, rather than it having to squirt round the channel in the shell.

...and I am asuming this is the large, deep, nicely machined groove, and not some horror story from a previous rebuild!
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The pics here might help you decide if you have a problem:

Alfa Romeo forum: 2.5 to 3.2 conversion, then to 3.0...

It should take you to the right page, if it doesn't, its page 70 I was tinking of...
 
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Ah, found a shot that shows the groove I think Rich is talking about....

Poor shot, but you should be able to clearly see the groove. This is a good crank (if a bit grubby!)
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...and I wish I could maintain the same level of sanguinity when things go FUBAR that you do Chris!!
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Yeah that's just an oil feed groove, I think it's replicated in the bearings too?...
 
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Hi Chris. On the last set of shells I bought, only the mains had oil distribution grooves. The BE shells were solid - no grooves, no oil holes.

TBH, I honestly can't recall for certain if previous BE shells have had grooves...but pretty certain not. Just the mains. I know Alfa dropped the hole in the conrod, and the hole in the BE shell over a period of time.

Found a piccy that (just) shows the main shell oil groove, and no hole or groove in a BE shell. These are shells direct from Alfa, rather than aftermarket types, so I guess there could well be variations??
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