Timing Belt Tension ???


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swr1977
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Timing Belt Tension ???

Post by swr1977 » Wed Jul 27, 2016 12:58 pm



I have taken the timing belt covers off to check the belts, and to me they look good but I'm unsure of the tension. Both belts only have tension on the side with the tensioner, the other is very loose!

Please look at my video and advise if this good or bad!?





I've also attached some pics of the belts. Please let me know if they look OK!?

Also while inspecting I found what looks like a slipped seal behind the right timing sprocket. Should I be concerned about this?
Attachments

Right Side
Right Side


Right Side
Right Side


Right Side
Right Side


Left Side
Left Side


Left Side
Left Side


Left Side
Left Side


slipped seal?
slipped seal?


slipped seal?
slipped seal?



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WingAdmin
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Re: Timing Belt Tension ???

Post by WingAdmin » Wed Jul 27, 2016 9:07 pm

The non-tensioned side of the timing belt doesn't matter - the amount of tension on it will change as the engine rotates, and the valve springs exert force at different points during the rotation on the cam, which will pull that belt more or less against the crank pulley.

What matters is the tension on the side with the tensioner pulley.

As for whether they "look good" or not - you can't tell the condition of a timing belt by looking at it. One that is going to fail the next time you start the bike can look exactly the same as one that was just put on and will run for another 100,000 miles. The rule of thumb is, if you don't know when the last time was that the belts were replaced, then you need to replace them.

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swr1977
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Re: Timing Belt Tension ???

Post by swr1977 » Wed Jul 27, 2016 9:40 pm

WingAdmin wrote:The non-tensioned side of the timing belt doesn't matter - the amount of tension on it will change as the engine rotates, and the valve springs exert force at different points during the rotation on the cam, which will pull that belt more or less against the crank pulley.

What matters is the tension on the side with the tensioner pulley.

As for whether they "look good" or not - you can't tell the condition of a timing belt by looking at it. One that is going to fail the next time you start the bike can look exactly the same as one that was just put on and will run for another 100,000 miles. The rule of thumb is, if you don't know when the last time was that the belts were replaced, then you need to replace them.
Thanks WingAdmin!

You always give great advise... I'll change them soon!

What is/are you thoughts on the last few pictures of what looks to me like a maybe a seal or spacer that's slipped out ... The pictures are taken looking through the right side timing gear/sprocket.
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WingAdmin
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Re: Timing Belt Tension ???

Post by WingAdmin » Wed Jul 27, 2016 10:08 pm

It certainly does look like that - and there is definitely oil there, which you don't want getting onto your timing belts.

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Re: Timing Belt Tension ???

Post by swr1977 » Sat Jul 15, 2017 3:02 am

WingAdmin wrote:
Wed Jul 27, 2016 10:08 pm
It certainly does look like that - and there is definitely oil there, which you don't want getting onto your timing belts.

I'm finally getting to this project!

Below I'm referring to item numbers on the following page: http://www.partzilla.com/parts/search/H ... parts.html

I think the seal/gasket #18 that needs to be replace is between the head and rear timing cover #5

WingAdmin ...can you or anyone else tell me if the timing belt pulley #14 can be removed from the camshaft without removing the heads from the block? I don't want to damage anything!

Also... Any suggestions on were to find parts? If I'm replacing the seal/gasket #18 for the right side I'd like to replace the left one #9 at the same time but http://www.partzilla.com show it as a obsolete/discontinued part! I've called a few local dealers and cant find it! And I'm looking for a lower radiator hose!
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Re: Timing Belt Tension ???

Post by WingAdmin » Sun Jul 16, 2017 8:32 pm

swr1977 wrote:
Sat Jul 15, 2017 3:02 am
WingAdmin ...can you or anyone else tell me if the timing belt pulley #14 can be removed from the camshaft without removing the heads from the block? I don't want to damage anything!
Yes. Direct quote from the Honda service manual:
Remove the Centre bolts from the two driven pulleys and draw the pulleys from position. Note the Woodruff key in each camshaft, which should be removed using a suitable screwdriver. Before removing the pulleys, check that both are marked on the outer face so that no confusion will arise on re-assembly.





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