SOHC.co.uk Forums > CB350/400
cam chain adjuster
cliff7:
I've recently bought a 1978 CB400F. There is a slight rattle when cold that disappears when warm. I am paranoid about adjuster problems. Is there a way of checking whether the horseshoe and/or tensioner rod are seized? Does sump removal help? Also if the threads for locking bolt are damaged is there a way of repair? These questions have probably been answered before but new to site.
Nurse Julie:
If something is noisy when cold but the noise goes away when warmed up as the metal has expanded, it's usually the tappets that need adjusting. If the noise is still there, it could just be a chipped tappet. If its the cam chain / adjuster the noise will get less noticeable and may disappear completely at higher revs when both hot and cold. It depends where this rattle is from, it could be the standard SOHC/4 clutch rattle.
No, you can't get to the cam chain adjuster horseshoe through the sump, the engine needs to be stripped. Dodgy trying to do a thread repair but not impossible, it's the swarf entering the engine which is to be avoided at all cost as this can wreck the engine completely.
Just try a normal cam chain adjustment to start with. Engine running at 2000 rpm, loosen off adjuster locking nut, loosen off adjuster nut and if the springs are still OK and the horseshoe pivot not seized, it will tension itself automatically being that it is a self adjusting mechanism. Do not screw the adjuster bolt inwards on any accounts. Lock it off with lock nut, job done.
cliff7:
Thanks for speedy reply. will do as you suggest.
bobv7:
Would this be the same method for adjusting the CB500 cam chain? The newer? Haynes book seems a bit short on this info! :o
Nurse Julie:
--- Quote from: bobv7 on January 01, 2020, 04:20:31 PM ---Would this be the same method for adjusting the CB500 cam chain? The newer? Haynes book seems a bit short on this info! :o
--- End quote ---
No, totally different set up on the CB500/4
Navigation
[0] Message Index
[#] Next page
Go to full version