zraffz

I know this is hard to do without pulling measurements but I have no experience rebuilding a motor with a crank that is actually grooved (normally just send them out and have them polished).

The #4 & #5 rod bearings spun and grooved the journals in two spots; my finger nail catches it. I'm trying to avoid having to buy a new crank and have the rotating assembly rebalanced.

paulo57509

That looks pretty bad. I'd find another crankshaft.

kauboy

Johnny Blaze

iTrader: (15)

Holy crap!

Maybe it could be cut down enough to run some small journal rods!

That is beyond help imho.

Tuned Performance

iTrader: (92)

[QUOTE=Johnny Blaze;5564212]Holy crap!

Maybe it could be cut down enough to run some small journal rods!
.

TTOP350

iTrader: (8)

If you cut it down to use the small Honda size rods you may be fine buuut I'd find another crank unless you know a person that is a great cast iron welder.

Johnny Blaze

iTrader: (15)

Of course he would want to have it rebalanced then, which he is trying to avoid apparently .

Time for a new crank!

Vader

I might just be piling on here, but I'd cut my losses and get a balanced crank kit. If you really like your current rod/piston set, you could go the long way, get a crank, have it balanced, size and fit everything, and assemble it into the freshly hot-tanked block.

How did the cap fare?

zraffz

I finally got around to measuring it. Never really had to measure a crank before cause I've always just sent them out to get polished and nothing more.
Well it measured 2.098-2.1 across most of the journals and the badly damaged one measured 2.045"... guess it's shot.

Ended up picking up another stock vortec rotating assembly for $50. Crank should be able to just get polished.

Tuned Performance

iTrader: (92)

Just curious why you are messing around with a junk bottom end your better off with a bone yard engine to start with.

zraffz

Originally got a 90,000 mile vortec motor (with crosshatching still in the cylinder walls) with a rod knock for $125. I needed a few parts off it (sensors, injectors, manifolds) for a truck I have and the injectors alone are $300+ new.

Out of curiosity I pulled the motor apart. Seeing the damage I snagged another crank/rods/pistons for $50. So after getting the crank polished ($77), picking up rod bearings ($26), main bearings ($26), freeze plugs ($13), cam bearings ($28 + $30 install=$58), rings ($130), rod bolts ($66) and having my rods resized ($140); I have a great starting platform for just over $700 and have $300 worth of parts that I need for another one of my vehicles and a set of vortec heads.

Not to mention most local junk yards or craigslist guys in this area want $400-$500 for a roller motor.

Tuned Performance

iTrader: (92)

Not a bad start but with that much metal ran through you might want to have in line honed.