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Plastigage? and main bearings.

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Trigger:
Crank journal wear can be felt with the finger nail as, the shape of the shell. The centre part of the journal never touches the shell so, the worn part is always the two sides of the journal. The only time the centre part has any wear is, if the oil has contaminates in it. 
Just think of a crank rotating at 5,000 rpm for 40,000 miles, you will find some sort of wear to the running part of the journal and shell.  ;) 

Seabeowner:
Rough calculation: Maybe about 250 million turns.

SumpMagnet:
so it's check clearances with plastigage and existing shells.
Work out if clearances are right ( need to dig out the digital manual )
Then buy shells based on what I find.

If the other journals are in spec...replace the one bad with a new Green shell.

If meaqsurements do not sit within tolernaces...work out what I might need. I know proper clearances are critical for these bearings, as the oil is pressyure fed into the middle...and excessive tolerances won't maintain the oil film needed to lube the surfaces. As will over tight ones.

Trigger:

--- Quote from: SumpMagnet on August 15, 2022, 08:54:51 PM ---so it's check clearances with plastigage and existing shells.
Work out if clearances are right ( need to dig out the digital manual )
Then buy shells based on what I find.

If the other journals are in spec...replace the one bad with a new Green shell.

If meaqsurements do not sit within tolernaces...work out what I might need. I know proper clearances are critical for these bearings, as the oil is pressyure fed into the middle...and excessive tolerances won't maintain the oil film needed to lube the surfaces. As will over tight ones.

--- End quote ---

If you need to replace any shells, they must be done in pairs  ;)

SumpMagnet:
yup. That was the one bit I did know :)

Shopping for plastigage now....so hopefully I can do some measuring this weekend.

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