Other Stuff > Misc / Open
Plastigage? and main bearings.
SumpMagnet:
@oddjob Big ends feel solid and smooth. Main shells show wear but were usable IMHO ...until I found the damaged one. I will need to find out what I have, and what I need.
Don't know what I have.,..so I guess thats the next step. Plus ordering some plastigage.
Thanks @taysidedragon ..appreciate the advice. I wasn;t sure if you had to allow clearance for sealant. Never had to do this before, as previous bottom end rebuilds had always been roller bearing cranks. Either Suzuki 4's or 2 strokes where you send the crank off to be split and rebuilt with new seals and bearings....and just drop it in. Only other plain bearing setups I have met have been top-end...with no shells. So this is a step into the unknown.
I also need to look at a few of the gearbox bearings, as it looks like a few had been moving. Might need a few drops of bearing fit when I rebuild.
McCabe-Thiele (Ted):
[ Guests cannot view attachments ] Be careful when buying Plastigauge by colour you really need to buy by the clearance size range as some cheaper brands sell green but it's the wrong range.
My Green Flexigauge is 0.025 mm to 0.076 mm / or 0.001" to 0.003 "
Attached document was sent to me by a member.
K2-K6:
"I wasn;t sure if you had to allow clearance for sealant."
It seems odd, but all of the sealant is effectively squeezed out during tightening of the bolts to make it metal to metal joint whether sealant is used or not. Obviously pointless to waste sealant and clean surfaces again during test assembly, as already pointed out above.
The crankcase is bored during manufacturing to make the holes as perfect as possible without any sealant ordinarily. Really what's left when assembly is complete is just a small amount sitting in any imperfect parts of the joint to prevent oil leaking during use and shouldn't change the tolerances at all.
Oddjob:
Check the edge of the bearing and see if any of the colour marking is still visible.
Pretty sure mine is a main as it came with some 500 main shells from the states. I'm 70% sure it's a green.
SumpMagnet:
I'll go investigate further and see if I can see any colour or clue.
But thanks for the input! It's really helping me get my head around this
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