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Author Topic: Adjusting Cam Chain Tension  (Read 907 times)

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Offline ben.cb500

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Adjusting Cam Chain Tension
« on: October 07, 2010, 04:00:40 PM »
Read the manual and it states that, a cb500 anyway, before tensioning the cam chain, the valves of cylinder 1 have to both be free from tension/engine is at 15 degrees before or after TDC or something to that effect.

i'd like to know why. why?
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Offline MCRider

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Re: Adjusting Cam Chain Tension
« Reply #1 on: October 07, 2010, 04:17:27 PM »
Quote from: ben.cb500 on October 07, 2010, 04:00:40 PM
Read the manual and it states that, a cb500 anyway, before tensioning the cam chain, the valves of cylinder 1 have to both be free from tension/engine is at 15 degrees before or after TDC or something to that effect.

i'd like to know why. why?
For the CB750 anyway, that position (cyl 1 on compression and 15deg ATDC)  puts the cam in such a position is respect to the various valve springs that are pushing/pulling that it is resisting the pull of the crankshaft. So the front run of the chain is in tension and all the slack of the chain is on the backside where the tensioner is. Then the tensioner is released and springs into the chain, locked down, that keeps the chain tight.

But i thought the 500 was adjusted while the engine was running? The CB750 is set static as you describe. Wait for further confirmation, but that answers your question anyway.
« Last Edit: October 07, 2010, 04:19:25 PM by MCRider »
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Offline bryanj

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Re: Adjusting Cam Chain Tension
« Reply #2 on: October 07, 2010, 10:42:01 PM »
look in the faq's engine section
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