dave_424
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| posted on 2/10/14 at 01:07 PM |
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Crank bearing damage
Hi guys, I had the sump off my turbo ZX9 to look at my busted gearbox and saw there were some small flakes/bits of metal in my sump. I put this down
to us destroying 3rd gears engagement dogs so much that it won't stay in gear.
I split the cases to change the gearbox and also wanted to look at the crank bearings, and the pictures below show what I have found.
Basically a couple of the bearings have light to medium scoring and one has two big gouges where it passed through a piece of metal.
I assume that these bearings need to be changed, although 1 or 2 of them look like they are still useable.
My question is, should I also replace the conrod bearings whilst i'm in there as I assume they will show the same damage? The conrod bolts are a
one time use deal so don't want to take them out if it's not needed.
I think a new set of bearings and bolts will cost me about £100
All info and advice welcome
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MikeRJ
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| posted on 2/10/14 at 01:25 PM |
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The big ends get fed by oil from the main bearings, so if anything has passed through the mains the chances are very high it's made it's
way through the big ends as well.
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steve m
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| posted on 2/10/14 at 07:11 PM |
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if I was to find my bearings in this condition, I would change them in a heart beat
ive even changed bearings with less than a 1000 miles on the clock, if ive had the engine in bits for what ever reason
Thats was probably spelt wrong, or had some grammer, that the "grammer police have to have a moan at
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dave_424
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| posted on 2/10/14 at 07:32 PM |
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Yeah I think I am going to change them, I've got to look at the top half of the engine casing and my crank to check for the marks left by mr
Kawasaki that denotes the size of bearing I should be using. I'll also just mic the journals to see how worn they are but I think I'll
just go with the same size bearings that it came out of the factory with.
Anyone know of any Kawasaki dealers that would be able to get my parts? I've got prices from Cornwall Kawasaki or are all the dealers going to
have the same prices?
Thanks
Dave
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Non custom
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| posted on 2/10/14 at 08:17 PM |
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Would also think the crank will need a good polish at the very least looking at those shells if nothing else but precaution !!!!
Make sure you get the plastigauge out too 
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ashg
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| posted on 2/10/14 at 08:48 PM |
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i have seen much worse, replaced the bearings with crank in situ and had no problems for 30-40k post change.
if your really worried get some 2500grade wet and dry cut a long strip the same width as the crank journal. fold it in the middle abrasive sides
facing each other and rub together. clean off with finger then rub some engine oil on the abrasive surface. take the wet and dry and run it round
the journals (same kinda motion as drying yourself with a towl) if there is any white metal from the bearings stuck to the crank that will get it off
and keep a good surface.
when your done get a can of wd40 with a straw and use it to flush out the oil ways and clean off the crank.
Anything With Tits or Wheels Will cost you MONEY!!
Haynes Roadster (Finished)
Exocet (Finished & Sold)
New Project (Started)
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ashg
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| posted on 2/10/14 at 08:55 PM |
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btw this is what a properly stuffed shell looks like, down to the copper! yours look like normal wear other than the little bits where it picked up.
looks like you caught it just in time to be honest! as long as there is still white metal there then the crank shouldn't be damaged
Anything With Tits or Wheels Will cost you MONEY!!
Haynes Roadster (Finished)
Exocet (Finished & Sold)
New Project (Started)
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dave_424
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| posted on 2/10/14 at 09:19 PM |
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Thanks for all the info guys, I'm going to look into ordering new crank and connecting rod bearings. Also the connecting rod bolts are a one
time use deal so got to order a new load of them. I think it's more £200 all in, which is slightly annoying since complete engines don't
go for much more than that but I've done things to this engine that would be a pain to do to another one.
This engine is in an off road buggy so it only gets used about 10-20 hours a year.
I definitely agree that I've caught it early enough for it to have not done much damage, I'll give the crank a slight polish but it looks
fine.
I'll also make sure to flush out all of the oil gallery's in the crank and block etc.
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ashg
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| posted on 2/10/14 at 10:42 PM |
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tbh if you only run it 10-20 hrs a year then there is still plenty of life in those bearings lol. may as well replace them now you have it in bits
though.
Anything With Tits or Wheels Will cost you MONEY!!
Haynes Roadster (Finished)
Exocet (Finished & Sold)
New Project (Started)
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obr_technology
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| posted on 1/11/14 at 09:19 PM |
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Not sure if this is of any use but I plan to use these guys for spares:
https://www.kawasakimotorcyclespares.co.uk/spares/epc2.asp?modelid=7418&pageid=4569&m=kawasaki%20zx9r%20c1%20crankshaft&uID=0
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dave_424
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| posted on 1/11/14 at 09:35 PM |
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Thanks, I had seen that website, Cornwall kawasaki seemed cheaper, just Google them.
I brought another set of casings, crank and connecting rods. That included some bearings from a bike with 16k miles. All rebuilt now and running good,
now I need to take it for a drive to see if the gearbox is fixed since that that was the initial problem haha
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