Crank Shaft Scored due to Oil Starvation

[Talbot]

Hi. After a bit of advice. REcently Brought a 2002 Suzuki SV650s with 20k on the clocks.

Was brought with the knowledge that the engine was siezed.

Managed to split the Crank case today and bad news the Shims on the Big end were rooted and this has scored the crank and left ridges on the con rods.

Firstly is there somewhere that I can get the crank and con rods skimmed?

My options at the moment are

A) Skim crank and con rods buy shim's small ends and gasket kit (if possible)

B) Buy new engine from ebay there are a few available from £150 up to £500

C) there is a crank with con rods on ebay but don't know any history at the moment. (but it is 2002) Also cost of con rods plus build will put it at around £300 anyway.

http://www.ebay.co.uk/itm/SV-650-crank-including-con-rods-/320779919550?pt=UK_Motorcycle_Parts&hash=item4aaff920be

All advice and options will be appreciated.

[squirrel_hunter]

I have had a crank reground and rebuilt the engine. Its possible to do but can take a while to sort the parts. Piston Broke in Bristol did the work. It ended up cheaper than a replacement engine, but unfortunately didn't last, suspected oil pump failure, but I haven't got round to checking.

I do have a replacement crank to do option C on your list once I get round to it.

In my opinion all of those options are viable.

[Talbot]

I have had a crank reground and rebuilt the engine. Its possible to do but can take a while to sort the parts. Piston Broke in Bristol did the work. It ended up cheaper than a replacement engine, but unfortunately didn't last, suspected oil pump failure, but I haven't got round to checking.

I do have a replacement crank to do option C on your list once I get round to it.

In my opinion all of those options are viable.

Hi thanks for your quick reply.

How much did it cost to get your crank done? also did they do the con rods??

Is this them?

Piston Broke

Address:Easton Business Centre, Felix RoadPostcode:BS5 0HECity/Town:Bristol (City of Bristol)Main phone:0117 941 2300 Thanks

Also any ideas on a timescale of your crank being available?

[squirrel_hunter]

Yep, thats the guy. Details of the work is here (http://forums.sv650.org/showthread.php?t=141656) and here (http://forums.sv650.org/showthread.php?t=152509).

[Talbot]

Hey thanks,

Sent crank of yesterday.

Just in case it is Routed. There is a Crank and rod's on Ebay at the moment however my con rods have 20F 19 on them whereas this crank and con rods have 20f 5 on them.

Any ideas what the difference is on them??

Thanks

[suzukigt380paul]

Hi. After a bit of advice. REcently Brought a 2002 Suzuki SV650s with 20k on the clocks.

Was brought with the knowledge that the engine was siezed.

Managed to split the Crank case today and bad news the Shims on the Big end were rooted and this has scored the crank and left ridges on the con rods.

Firstly is there somewhere that I can get the crank and con rods skimmed?

My options at the moment are

A) Skim crank and con rods buy shim's small ends and gasket kit (if possible)

B) Buy new engine from ebay there are a few available from £150 up to £500

C) there is a crank with con rods on ebay but don't know any history at the moment. (but it is 2002) Also cost of con rods plus build will put it at around £300 anyway.

http://www.ebay.co.uk/itm/SV-650-crank-including-con-rods-/320779919550?pt=UK_Motorcycle_Parts&hash=item4aaff920be

All advice and options will be appreciated.
as i have said on a previous thread getting the crank reground rairly works because the case hardening isn't thick enough,getting them metal sprayed and reground might work,and here is a bit of info i found
Steel Crankshaft Hardening

Recently, we have received quite a few questions regarding crankshaft journal hardening processes and concerns about machining steel crankshafts that have been hardened. Since a solid explanation will take longer then a paragraph, we have left this answer out of our frequently asked questions page so that we could devote more time to a detailed answer.
There are three common types of hardening processes used on steel crankshafts, and they are induction hardening, tuftriding, and nitriding. Below I will explain these hardening processes in more detail.
Most stock OEM steel crankshafts have been induction hardened. This is a low cost process in which the surface is heated by a high frequency alternating magnetic field that generates heat in the crank's surface quickly before being quenched. The depth of this hardening process is around .060 - .080. Because of uneven heating and cooling, this crankshaft hardening process creates stress within the crankshaft. While it is an ideal hardening process for stock applications, it is less then favorable for high performance racing applications.
Tuftriding was a process used by some OEM's on special high-performance crankshafts, primarily to avoid the stresses imposed by induction hardening. In Tuftriding, the crankshaft is immersed in hot cyanide compounds, creating a tough, resistant surface that improves fatigue resistance. The hard layer in a Tuftrided crank is usually very shallow, only penetrating around .005. One drawback of Tuftriding is the potential for warpage of the crank.
Nitriding is a chemical hardening process in which the part is heated in a furnace, the oxygen is vacuumed out, and nitrogen is introduced which penetrates the entire surface. The depth of hardness is dependent upon the time the crankshaft is exposed to the gas. Typically, a nitrided crankshaft will have a hardness depth of about .010 - .030. Nitriding is a low heat process compared to Tuftriding, but it shares the advantage of avoiding the introduction of localized stress zones as in induction hardening.
In most cases, a stock OEM steel forged crankshaft can be welded and/or ground then installed without concern. The induction hardening process has a significant depth, and on non welded journals will remain after being ground.
Tuftrided crankshafts can be welded and ground without concern. However, the shallow depth of the hardness would be lost after the grind. Therefore, it is recommended to have the crankshaft hardened again.
Nitrided crankshafts can easily be welded and ground without concern. A .010 undersize grind will cause some of the benefits of nitriding to be lost. At .030+ undersize, nearly all of the nitriding benefits are lost. Therefore, it is recommended to have the crankshaft hardened again after grinding.
It is important to discuss crankshaft hardening with the machinist which will be grinding your crankshaft prior to the weld and/or grind. These hardening processes can add to the size of the journals, so the crankshaft needs to be finish ground in such a way that allows for the expansion caused by hardening. I have personally ground new aftermarket crankshafts that were shipped out of tolerance. Trust me, as a machinist it is time consuming to setup and grind off .001 of an inch. So please let your local machinist know if you plan to have the crankshaft hardened!
There are some automotive machine shops that will not weld a steel crankshaft because it has been hardened. As a machinist, I have never turned away a crankshaft weld because of hardening. If you note my explanation of the hardening processes above, hardening is generally restricted to the surface. To weld a tuftrided or nitrided crankshaft, the journal or thrust needs to be underground first to remove this surface hardening. Then the weld can be applied. In cases where induction hardened crankshafts have been severely damaged, normally pre-grinding the crankshaft for a weld removes this hardening.
What about cast iron crankshafts? Do they need to be hardened? The answer is no. During the machining process, cast iron crankshafts become work hardened. If a more durable crankshaft is desirable for your application, it would be a good idea to look into purchasing an aftermarket steel crankshaft.

[yorkie_chris]

Personally for the work involved I would buy another engine.

[Dicky Ticker]

I tend to agree with Chris on that, Rebuilds can work out expensive and time consuming where as an engine transplant is only a days work
I don't know but Chris will,perhaps you can fit a later engine rather than look for a 2002

[yorkie_chris]

Yeah any you want with a bit off faffing about, I'd stay away from later twin plug one though.

[Talbot]

Hmm. More to think about. Also noticed that there is some scoring on the outside of where the crankshaft sits. However the cam chain bolt is only half worn. Thinking that crank shaft is bent i.e. not looking cost effective or safe to fix.

Also a bit worried from what Squirrel Hunter was saying that his oil pump has now gone could have the same problem.
Anyone know of any 2002 K2 engines for sale with ok milage on them?

Bit worried about buying from ebay as could start the whole process all over again.

[squirrel_hunter]

Also a bit worried from what Squirrel Hunter was saying that his oil pump has now gone could have the same problem.

I only suspect the oil pump as an explanation. I am in the process of stripping the engine down now to find out what happened. I think it may be something else, once I have the engine apart I can investigate further and check with a professional should it be required...

[Talbot]

Hmm. More to think about. Also noticed that there is some scoring on the outside of where the crankshaft sits. However the cam chain bolt is only half worn. Thinking that crank shaft is bent i.e. not looking cost effective or safe to fix.

Also a bit worried from what Squirrel Hunter was saying that his oil pump has now gone could have the same problem.
Anyone know of any 2002 K2 engines for sale with ok milage on them?

Bit worried about buying from ebay as could start the whole process all over again.

If I can get a crank and rods good job however As the case is scored I will have to get it skimmed and then I'm into new thrust washer etc etc etc.

Got an exam in a few weeks so going to cross my fingers that a decent engine turns up. Keep me posted on how the engine strip down goes hopefully we can work something out :grin:

Still in two minds about rebuild vs new engine. IT is cheaper to rebuild but just wanna get out and ride as havn't ridden a bike for almost 2 years now.

Get the feeling that I'll have an impulsive moment on ebay over the next couple of weeks :-p

[Talbot]

FYI Thanks for all your help.

Did some maths today and managed to find a engine for about the same price as a rebuild. so going to pick it up in a couple of weeks.

Much easier :-)