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SOHC.co.uk Forums => CB500/550 => Topic started by: oldtuggie on May 12, 2020, 05:47:18 PM

Title: Cam chain tensioner
Post by: oldtuggie on May 12, 2020, 05:47:18 PM

Hi
Just built up the cylinder and head and I'm not sure how far to tighten the top tensioner bolt.
If I bolt it fully up it seems to be slightly bending the tensioner and it stops the tensioner screw from springing back when the locknut is slacked off.
If I turn back the top bolt a little the tensioner bolt works as it should .
I have left it like this and used loctite will this be ok.
Thanks

Title: Re: Cam chain tensioner
Post by: Trigger on May 12, 2020, 07:00:11 PM

Is the bolt too long ? And it has a sealing washer, which you nip up to  ;)

Title: Re: Cam chain tensioner
Post by: oldtuggie on May 12, 2020, 08:55:52 PM

Hi
The parts diagram specifies a 22mm M6 flange bolt I have used a 20mm M6 flange bolt with an aluminium washer.
If I bolt it right home it seems to be pulling the tensioner backwards

Title: Re: Cam chain tensioner
Post by: oldtuggie on May 12, 2020, 08:59:56 PM

I've used a flat washer should it be a hollow crush washer

Title: Re: Cam chain tensioner
Post by: oldtuggie on May 12, 2020, 10:53:23 PM

I'm pretty sure that it is seated properly at the bottom but I haven't torqued the head down yet because I wasn't happy with the tensioner so I am going to take the head back off and check that it is seated correctly at the bottom.

Title: Re: Cam chain tensioner
Post by: Safo on May 13, 2020, 10:44:08 AM

Quote from: Oddjob on May 12, 2020, 10:33:38 PM

I'm wondering if you missed the groove in the bottom crankcase when you reinstalled the tensioner, that would pull it backward as the upper bolt tightens.

Washer should be fine if it's an alloy one.

you've got me thinking now oddjob, posted a similar question a few wks ago

Title: Re: Cam chain tensioner
Post by: oldtuggie on May 13, 2020, 02:44:24 PM

Hi
Took Oddjobs advice and removed the sump and sure enough I had missed the slot in the bottom of the engine and had jammed the bottom of the tensioner between the case and the starter clutch.
I'm really grateful for all of the advice that Oddjob and others have given me it has been invaluable
Many thanks