SOHC.co.uk Forums > CB750
primary drive train rattle - CB750F2
blackeagles:
the more i look at it the more uncertain i get.
if i remove the 3 bolts holding the cam chain adjuster housing to the engine will it come away along with the tensioner push bar spring i.e as a complete unit? - i'm fairly certain mine is not moving as a while back i undid the adjustment bolt and nut and put a rod into the end and gave it a light tap and it sounded solid so left it.
K2-K6:
Yes , you can remove the adjuster block from the engine. It just presses against the tensioning unit inside the barrels. They are effectively discrete components.
If you remove, free and lubricate the adjuster, then set it by squeezing the spring and locking off with security bolt, reassemble into motor, and then perform adjustment as per manual.
If it's stuck as you suspect, then it's likely the cam chain will be running loose.
Bryanj:
If you leave the pinch bolt done up the rod will stay in the casting, two things can happen apart from soezing
1 cam chain worn out and adjuster rod is hitting clamp screw, there is a flat milled on the rod with a vertical "wall" at each end which hits the clamp bolt when chain worn out
2 the clamp screw has been done up too tight and deformed the rod a bit making it tight in bore.
Skoti:
If most of the rattle goes away when you pull in the clutch then it's probably not your cam chain that's the problem.
You could also check the primary chain wear tolerance by removing the sump plate and measuring between the tensioner bracket and sump plate mating surface.
But you need to complete your carb tune up first because that may silence the rattle.
Good luck!
blackeagles:
no change if i pull in the clutch.
i'm supposed to be looking after my wife but i could not resist having a look. it was slightly sticking (slight bur due to the bolt being tightened with the shaft off centre) but a bit of emery and some copper slip made it slide nicely. the bolt marks on the shaft show it touches about half way so seems there is some adjustment left.
so rattle can only be the primary chain and i still think its due to uneven tickover (you can hear a slight change in the tickover and see the tacho needle moving slightly), so i'm still looking at the gauges not reading correctly - this is very similar to the poor initial running of the cb400f i did 2 years ago and it turned out to be the slow running jets being 'cleaned' and made oversize, a new set and it runs lovely!!
may have to beg, borrow or buy a decent set of gauges just to make sure the sync is ok before i yet again remove the carbs.
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