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Old 11-01-2012, 07:45 AM   #1
jamespedro28
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crank shaft shells

i have a knock from the bottom end of my 1993/4 water cooled 750 gsxr,striped the engine and found it was coming from no,one cylinder con rod / crank connection.so it needs knew shells.when i looked on the alpha sport web site.it gives 3 different colored shells.how do i get the rite ones to fit.i guess there all different sizes.
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Old 11-01-2012, 08:09 AM   #2
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Re: crank shaft shells

Plastiguage&measure
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Old 11-02-2012, 03:21 AM   #3
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Re: crank shaft shells

There are four numbers on the crank, and each rod has a number on the edge near the part line. Look up the table in the manual, and you have the colours you need . . . assuming that there is no wear on the bearing surfaces, of course!
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Old 11-02-2012, 10:26 AM   #4
jamespedro28
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Re: crank shaft shells

hi,is the plastigage the same as a micrometer.and do i measure the diameter or the circumference of the crank.and then does the measurement dictate the colour of the shell...thanks for your help and patience....
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Old 11-03-2012, 02:39 AM   #5
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Re: crank shaft shells

Plastigauge only checks the clearance between the bearings and the crankpin after asssembly. The numbers on the crankshaft and the conrods (as I mentioned before) relate to the diameters of the crankpin and conrod bore (respectively), and they have been marked by Suzuki. The service manual details all this. I can help if you send the number code on the crank (eg. 2222), and the numbers on the rods in order of cylinders 1 to 4 (eg. 2222). I can then reply with the bearing colours required in order of cylinders 1 to 4. BTW the crankcase and crankshaft are marked with ABC to denote sizes, and the same procedure applies.
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Last edited by wombat58; 11-04-2012 at 01:31 PM. Reason: typo
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Old 11-03-2012, 02:47 AM   #6
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Re: crank shaft shells

if the crank has any kind of wear/damage from the previous "shells", it will just destroy the new "shells" which are called rod bearings - with-in minutes of start up. Also, not to be a complete d1ck but if you dont know what plasti gauge is, then most likely your mechanical ability isn't sufficient for rebuilding a motor.
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Old 11-04-2012, 05:21 AM   #7
jamespedro28
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Re: crank shaft shells

well thanks for your help.and after doing some sussing out.and down loading a service book.its pretty straight forward.not quite rocket science.the crank is within its tolerances.and the plastigage hair shows the Shel's are worn.so i will replace.experience wise.not to much on Suzuki's.but quite a bit on ducatis and british bikes ....
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