SOHC.co.uk Forums > CB750

Engine full of fuel and seized up

<< < (27/50) > >>

PJM47:
Yeah I took it off, and the cam out after that pic. We’re only left with the con rods or piston rings. I guess.

Trigger:
Did you test the cam in the towers with the chain off ?  You are jumping too far ahead with pictures so, if i can't see the stages then, i will miss things that maybe important to advise on this problem .

PJM47:
Yeah sorry I may have got carried way, I guess I thought as it felt the same with the cam off completely it wasn’t a cam problem.

K2-K6:
If it's tweaked the rods such that the big end sits out of plane with it's journal,  then that pinching would give sporadic resistance.

You'd expect to find witness marks on the big end shells as they would effectively try to wear "diagonally "  which if wearing away would slowly allow you to turn it as the shell material wears off.  Potentially  ;D

PJM47, notice, from dismantling, how you can set the cam timing with absolutely no risk when you come to reassemble as nothing interfears while rotating/ checking until you put the rockers in.  It's a very clever design like that.

PJM47:
So head off today. All went well, quite easy really. Barrels are all looking good, no marks or scoring.

Indeed this engine is beautifully designed, unlike the British ones from the same era I've worked on.

Still very hard and uneven to turn over as we would expect. So I guess fairly conclusive big end / conrod damage now as there's not much else left.


[ Guests cannot view attachments ]

Navigation

[0] Message Index

[#] Next page

[*] Previous page