2 replies to this topic

[scottyboy805]

Crankshaft has previously been reground I believe and am just trying to work out by how much. I was expecting to see something like 020 but I am not too sure what these numbers are telling me. 
If I had to guess I would say +10, but it would only be a guess so hopefully someone with more experience can offer some insight. First picture (With `LOWER` marked) is the main bearing, and second is a big end bearing, but I assume they will be ground the same amount.

 

 

[nicklouse]

Can’t tell you the sizing. But never assume that they will have been ground the same. Also I would be having the crank measured to check it does not need any work or different bearings.

[Spider]

There's a few ways of working it out, but without know if you have small or big bore engine;-

 

Small bore BE shell (wall) thickness is 0.0719" for a std shell
Small Bore Mains are 0.0722"

Big Bore BE shell is 0.0719 (1.625 nominal journal)

                                0.0718 (1.750" Nominal)
Big Bore Mains are 0.0720"

add 0.005" to these for each step up in undersize.