Crank markings

Question and answer direct with GC. Competition engines and 'live' projects only. Good photos to illustrate your post are expected.
Post Reply
Posts: 60
Joined: September 4th, 2006, 2:09 am
Location: Pafos Cyprus

Crank markings

Post by ace124 » February 24th, 2011, 9:27 am

Is it common for Fiat to stamp their cranks with factory O/S's?
I have here a couple of 2L cranks that i was examining this afternoon for a friend and noticed one has [+0.254] stamped on the side of one of the counterweight flats.
Is this refering to an undersize on one journal? or all? Or maybe the crank was machined by a machine shop and they stamped it given it seems to be an imperial measurment not Metric?
I dont have a micrometer handy ATM to verify for myself but very interested to know if this is common.

Guy Croft
Site Admin
Posts: 5018
Joined: June 18th, 2006, 9:31 am
Location: Lincoln, UK

Re: Crank markings

Post by Guy Croft » February 24th, 2011, 11:18 am

It is not common but it happens.

The stampings indicate an 'odd sized factory journal' and bearings are not available for them. This is very annoying and I do not think the factory should have ever approved the practice.

If the old bearing is good enough to re-use then do so otherwise that crank is scrap, you must not regrind them as it destroys the carburised layer (hardness and oil retention lost..)


Post Reply

Who is online

Users browsing this forum: No registered users and 4 guests