SOHC.co.uk Forums > CB350/400
I think I have a problem with one of the conrods - HELP
McCabe-Thiele (Ted):
I'm thinking as I have not gone any further I will have to split the crankcase to see if there are any bearing marks - not looking forward to removing the Honda bond.
Nurse Julie:
--- Quote from: Macabethiele (Ted) on June 02, 2021, 08:09:48 PM ---I'm thinking as I have not gone any further I will have to split the crankcase to see if there are any bearing marks - not looking forward to removing the Honda bond.
--- End quote ---
When you had the engine apart originally Ted, did you torque up the con rods to see if there was any tight spots which may indicate ovaling of the con rod big ends. If the shells are now marked in any way, it usually means the con rod needs re claiming due to ovaling.
400 Cafe Racer:
Hi Ted,
I found that using a small paint brush dipped into a shallow cup of cellulose thinners, then gently brushed over the Hondabond joint face and left for 5 minutes, will soften it dramatically, sufficient to wipe off with a cloth.
Do you know what big end shell colour was installed previously ?
Dennis
McCabe-Thiele (Ted):
--- Quote from: 400 Cafe Racer on June 02, 2021, 08:37:43 PM ---Hi Ted,
I found that using a small paint brush dipped into a shallow cup of cellulose thinners, then gently brushed over the Hondabond joint face and left for 5 minutes, will soften it dramatically, sufficient to wipe off with a cloth.
Do you know what big end shell colour was installed previously ?
Dennis
--- End quote ---
Only one and four had the original Geen markings still visible. The shell codes were all the same but that is probably meaningless. Conrod 2 & 4 were marked 1B conrod 1 & 3 were marked 1A. The Green shell code was still visible on conrods1 & 4.
I will try some thinners when I dismantle. I should have checked the rotation before I fastened it up.
McCabe-Thiele (Ted):
--- Quote from: Nurse Julie on June 02, 2021, 08:15:23 PM ---
--- Quote from: Macabethiele (Ted) on June 02, 2021, 08:09:48 PM ---I'm thinking as I have not gone any further I will have to split the crankcase to see if there are any bearing marks - not looking forward to removing the Honda bond.
--- End quote ---
When you had the engine apart originally Ted, did you torque up the con rods to see if there was any tight spots which may indicate ovaling of the con rod big ends. If the shells are now marked in any way, it usually means the con rod needs re claiming due to ovaling.
--- End quote ---
I will look at that when I take the crank out - I'm just annoyed at myself for not checking - good new its only cost a small amount of Hondabond & my time. I might have to ask you about how to check for ovaling!
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