I did some preliminary measuring on an ITR crank I have and took another look at the damage it has.

I only got around to measuring the main journal diameters, and I like the way the numbers are looking so far. I'll mic the rod journals tomorrow.

Specified range for main journal diameters are (1,2,4,5 = 2.1644" to 2.1654" and 3 = 2.1642" to 2.1651").


All of the mains were coded "3". That'll keep me out of trouble since I'm having the journals micropolished and then I'll be remeasuring the journals again to see how much they took off.

The bad news: Number 3 rod journal counterweight has damage from a dropped valve or piston bits. There's damage on both ends of the counterweight, just more on conrod opposing side. There's a known good above it in the pics for comparison. I'll probably deburr the jagged edges and have the crank guy at Schmidt Racing Engines check the balance on it to see if it's even worthwhile to use.






If anybody's got any good, useful commentary, let's hear it. Otherwise, it'll just have to be another show'n'tell from me to everybody.

EDIT:

Rod Journal Numbers are in. Specified range is 1.7707" - 1.7717".



Modified by IN VTEC at 11:43 AM 7/29/2004

 

You can smooth out the damage to the counter weights with a grinder and be ok. You would need to rebalance it, of course. It looks, however, as if the rod journal is ruined. You cannot fix that properly unless you are willing to re-heat treat the crank. Heat treating runs about $200 alone. The crank may be bent a few thou also from the beating it took. It should be straightened.

 

The journal probably just looks that way from the flash reflecting off the polish mixed with the fuzzies and pubic hair, but I'll have a second look when I go to wipe off and mic the rod journals.

I guess if it really comes down to it, I'll just have to plan on reusing my GS-R crank.

The biggest question on my mind tho, is--How would you establish the centerline for the crank to determine if it was not straight? Seems like a Catch 22 to me, since every reference point seems to be unreliable for establishing a baseline for straightness.

 

knife edged gsr is better than an itr..... i say go ahead and knifeedge the gsr crank.