SOHC.co.uk Forums > CB350/400

The camchain tensioner screw/bolt

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McCabe-Thiele (Ted):
https://flic.kr/p/2kymoFkCam chain tension bolt by Macabe Thiele, on Flickr




The above photo is of the camchain tensioner before I attempted to remove the cylinder head. There were 3 washers between the lock nut & engine for some reason. I guess the reason for so much threaded bolt showing is due to chain wear as screwing it in seemed to release the tension - that seemed illigical to me as I thought screwing it in would increase tension!

K2-K6:
The bolt doesn't tension as such, it just locks (when you tighten) the tensioner mechanism at the place it's set to.

Unlocking the bolt lets the internal mechanism move to it's "correct" position via it's own spring,  you then lock at that position for all subsequent running until the next time you want to alter it. 

In effect,  you just nip the main bolt onto the internal tensioner,  then secure that position with the nut to now prevent it backing out.

Dave:
My understanding is that screwing it in does not increase tension. It only locks the adjustment made by the internal horseshoe/ spring arrangement. If the horseshoe is seized or spring worn, tightening this further will only bugger up the thread.

McCabe-Thiele (Ted):
That makes sense - my Haynes manual refers to screwing the tensioner in to release tension so that's what I did. Both sides of the curved tension arrangement have come out just fine.

Present issue is the cylinder head is stuck to the block - I've removed all 12 of the cylinder head nut & washers but the head will not budge - the block & head will lift slightly together instead. I was hoping to remove the head & block to make the engine lighter to lift out.

I'm pretty sure I can't lift them out stuck together whilst in the frame still - not enough clearance. Currently squirting WD40 down the stud area and on the outside of the head gasket. I guess there are some locating dowels holding it together.

Any tips on seperation or do I just leave it alone until the engine is out?

taysidedragon:
Try tapping it sideways all around with a soft hide mallet or similar. Edge on to the fins, but not too hard or they'll break. Keep trying,  it will move eventually.

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