well about 2 mounths ago i broke the crankshaft in my remaned 3.0
i was pulling a small empty 6x8 trailer on about mile 70 i heard a faint knocking sound then about 10 more mile the truck backfires then dies
after a visual inspection i thought the crankshaft pully had waobled lose but after getting the truck back home a 100ml trip good thing i had a tow bar with me
the signs didnt add up for the lose pully so i thought broken crank <img src="/forums/images/graemlins/scared.gif" alt="" />
ive pulled the motor and inspected the crank and yep its broken
apears to be no damage to any other parts
i have never replaced a crankshaft before
can someone school me on the process

I'm no machinist but you get a new or ground crank then buy the bearings to match. There is all sorts of stuff you should check that's in any rebuild manual.



<img src="/forums/images/graemlins/patriot.gif" alt="" /> <img src="/forums/images/graemlins/cheers.gif" alt="" />

Auto zone has a new crank for around 175.00
what is the proper way to measure crank and rod bearings

You don't measure it. Take it to a machine shop and get them to look at the crank bearing saddles in the block and the removable main bearing girdle and the rod big ends to see if they are suitable for a new crank, then just use the original size bearings if everything is ok. I would have the rods reconditioned and do the bores and pistons and rings and valves while I had it apart...

this is a rebuilt long block (rebuilder unknown it had a tag on the freeze blugs w/numbers no name)
i bought a parts raider that had this motor in it but it was never started
not sure if it was line bored or just honed
i do know that you just dont go back with the stock main and rode baerings with out measuring (plastigage or miking clearences)and hope its right
i talk to a machine shop about replacing the crank for me but he said they dont work on mitsubishi engines <img src="/forums/images/graemlins/confused.gif" alt="" />
i will make some more calls tomarrow

I bought a standard size crankshaft and bearing kit, and new rods and rings from Advance Auto Parts and rebuilt my engine (pistons were fine and were pressed off the old rods and on the new rods). Mine had spun a bearing on the #2 connecting rod. I had the head reconditioned as well too. I've got over 3,000 miles on it now and it's going strong.