Yes - if the crank journals are to spec, replace with the same (hopefully std) size shells.Digit":191cv35p said:The journal size is a code letter stamped on the crank web Dibs, the manual will tell me what that size should be, I have mics of various sizes and the shaft will come out once I take the caps off, that way i can leave the pistons in situ, unless I have to remove them for some reason of course.
So if I understand you, and my own experience correctly, if the journal is to spec I simply replace the shells with the same size as those already in situ, correct?
Mick - that's why I said, I would expect the shells to wear rather than the crank. Most cranks have been treated to harden the surface of the journals and it usually takes a "dead-engine" event to introduce harder particles to score and damage the journals. Thus requiring a regrind. But as you say - if you are going to mic a journal - makes sense to check for ovality, be daft taking a single measurement.Spindle":191cv35p said:Hi
I'm afraid I'm going to have to question the statement that only the shells will wear - this is not the case. The relatively soft material of the shells pick up and reatain harder particles which in turn cause the journals to wear. Measure the ovality of the journals, (use a micrometer), and from that identify the minimum regrind to return to cylindrical, then compare to the available shell diameters and get the crank ground to suit, install with new shells - jobs a good un.
But surely mic'ing the crank journals would tell you if any of them were worn?MickCheese":33rtk36g said:When I replaced the crank shells on a VFR400 I got the stamped in number off the shaft and if I remember correctly there was a stamped in number on the crank case then, in the manual, there was a colour code for the correct shells.
The Plastigauge is to check for oil clearance. With new shells they should be within tolerance but if the crankshaft is worn then the plastigauge will be too thick and so you will need a new shaft, I don't know if you can regrind and get smaller shells for these bikes?
So, with new shells the Plastigauge is only telling you if the crankshaft is worn or not.
I want to sat 30mm. I have looked in my workshop manual and it looks like the shells have a tolerance either side of that so I assume as a guide it is 30mm.Digit":272yt33u said:That basically confirms what I reasoned to be the case Mick. As for regrinding, I doubt it. In the magazines a company called SEP reckon to repair or service exchange any crank, though God knows what that would cost.
David Silver is advertising ONE shell????
As it stands even if the crank is ok shells are gonna be a problem, I don't know if they can be produced to order by some one and if so, the cost.
The bike is still big in Oz so there may be a source there.
Out of curiosity Mick, what is the nominal diameter on the VFR, any idea?
I'll have to remember that one if ever doing some kind of spec, where I feel like having some amusement!Digit":35xay66e said:I recall an instant when a drawing gave a diameter as 'to fit part B'.
When I checked the drawing for part B it stated the diameter as 'to fit part A.'