Busted Crank

So following from the crank bolt thread. I've taken my engine apart to discover that one of the big end bearing shells has disintegrated . There are two main lumps, half a dozen smaller lumps and a load of grit. Most of this was in fact contained by the connecting rod and crank shaft and damage to the rest of the engine looks to be minimal, but the crank pin is pretty deeply scratched on one half, the other half looks to be pretty much intact.

I am just wandering really what my options are from this point. I figured I can either swap the engine, replace the crankshaft or scrap the bike for parts. I am just trying to figure out my best route.

I think that whether it's worth it or not comes down to how much you can get a replacement engine for. I've seen crankshafts that cost more than complete engines.

Is it not possible to just replace the bearings? (possibly a stupid question)

I think because the crank pin is so scratched that just replacing the bearing shell will leave to great a tolerance.

Around £500 for an engine, it just comes down to money and time. Can you have the bike off the road for a while replacing the engine or buy a replacement bike and sell off the spares?

[squirrel_hunter]

Originally Posted by ClunkintheUK

I am just wandering really what my options are from this point. I figured I can either swap the engine, replace the crankshaft or scrap the bike for parts. I am just trying to figure out my best route.

Well that's pretty much your options. The easiest is to swap the engine. Parting the bike out can be a chore and what are you going to do for a bike after? Replacing the crank is not a quick job and can be as much to do as the engine replacement route. But if its something that interests you why not...

Originally Posted by Alexander94

Is it not possible to just replace the bearings? (possibly a stupid question)

It's not a stupid question. However no its not as simple as replacing the bearings. There are no oversize bearings from Suzuki so you have to source them from something else. Then there is the problem of the crank, there will likely be damage to the pin as Clunk has found, and fixing this is difficult if not impossible. From experience this refinishing can weaken the crank and cause failure. That's not to say its impossible, but its why most people replace the engine or the crank should the worse happen.

There was a guy in London that had a 15k miles engine for £100. I donct know of he's sold it or not.

I've got an SV that I've been selling off for months and it's proving to be a very arduous task...

Thanks for clearing that up squirrel.

[andrewsmith]

Shells are available for suzukis but it's a chew on. I know someone that's been rebuilding a gsxr 1000 k5 for a turbo bike and he had to do some blagging to get them

sent with all the fury of a clogged drain!!

The main bearings I think are fine. It's just the bearing shell on the big end of the rear con rod. I guess my main question is the difficulty of putting it all back together again and getting it to work. The rest of the bit I need (various gaskets and replacing crap bolts that nearly sheared in the dismantling) are about 150.

[squirrel_hunter]

Originally Posted by ClunkintheUK

I guess my main question is the difficulty of putting it all back together again and getting it to work.

Well if I've managed to do it before...

[DJ123]

Originally Posted by squirrel_hunter

Well if I've managed to do it before...

twice . . . .