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Plastigage? and main bearings.
SumpMagnet:
How exactly does this stuff work?
Was going to reuse the shells on my 750 project until...today.
Got some time off work so I decided to start cleaning down the crankcases to get them ready for paint. Stripped off the wrappings they were hibernating in...only to see an issue. Where the main bearing shells used to be showing that even dull wear ..I saw one of them had a 'shiny' mark on it. Shiny isn't good. Even worse is when you find the shiny mark is a gouge. It's not wear...something pointed has fallen on the bearing, and dug a chunk out. It;s sharp and stickes up above the worn surface.
That tells me it's scrap.
If I am going to have to replace one....I am assuming I should be replacing the whole lot as a set?
I think I need plastigage to check clearance.... but I have never done anything like this on a plain bearing engine. Don;t have a clue where to start!
taysidedragon:
Buy the Plastiguage that covers the range of bearing clearances that you're looking for. I bought a mixed pack that had Red and Green colours for my 400f.
You lay a short strip across one bearing shell for each pair then place the crank back in and bolt the two crankcase halfs together to the correct torque. Then separate the two halves and remove the crank.
The Plastiguage squashes flat and takes up the exact thickness of the clearance gap. The smaller the clearance the more it squashes and the wider the Plastiguage goes. The set includes a strip of card showing the different widths for measuring your clearance gap. Just find the closest one to your result.
SumpMagnet:
Do I bolt it up dry....or with Hondabond sealant in place?
Better go read up the manual for proper clearance.
Oddjob:
I have a single 750 shell you can have for free but I have no idea what it is, could be a main or a big end, could be green or brown etc.
What do you need?
taysidedragon:
--- Quote from: SumpMagnet on August 11, 2022, 09:37:17 PM ---Do I bolt it up dry....or with Hondabond sealant in place?
Better go read up the manual for proper clearance.
--- End quote ---
Dry, you're taking it apart again straight away.
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