Remembering why I
dislike working on
AO Silver Member
Join Date: Sep 2001
Crank journal colour codes....
Specifically for a 164 crank I'm working with.
Crank shell colour coding. Can anyone tell me definitively how the paint blobs relate to each journal? It's all very well Alfa saying 'paint mark adjacent to journal' but the way they put them on, and the number of them, I can't make much sense out of it.
My concern is I'm having trouble with clearances on the mains and it crossed my mind that the ones I took out of the engine (it having been previously rebuilt by somewhat of a muppet) might not be correct.
I'll take a picture later, but most of the blobs are red, one by the rear main is green, I took green coded shells out when I stripped it, but some new greens I had in stock are too tight (although plastigauging them gave 1.2-1.5 thou clearance, which is good). Each one seems to contribute about the same amount of resitance as well, so it's not as if it should be 3 reds and 1 green as far as I can tell. Each shell has about the same amount of shine on it now I've turned the crank over a few times, so again, each journal seems equally tight based on that as well. Seems tighter by the joint than at the top & bottom. Dunno, confused really.
Worst-case and I just put the old ones back in, as they are in decent order, oil pressure was good before it was stripped and it's getting a new pump anyway. I could always buy a set of reds and try those as well I suppose - not that expensive but it's just bugging me a bit at the moment. Don't want to keep buying shells that don't fit.
Had exactly the same problem with the previous engine - took out greens, some crank markings were green, ambiguous (to me at least) paint blobs, new green shells so tight it was impossible to shift the crank despite similar measured clearances. Same shells though, so maybe they are just duff. Genuine Alfa parts by the way.
No such trouble with the big ends - shells clearly reds, journals all marked red as far as I can tell at least, clearances come out to around 1 thou ish, all rods move sweetly.
I've asked this over on AlfaBB and 155.org as well, but no news so far. Sorry about the cross-post, but I could do with some guidance.