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Author Topic: Cam chain tensioner noise  (Read 1398 times)

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Offline newday777

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Re: Cam chain tensioner noise
« Reply #25 on: September 15, 2023, 10:33:41 PM »
What ever way you go through the process, do not try to turn over with the plugs in place as you will bend the tiny advancer shaft.
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Stu
Honda Parts manager in the mid 1970s Nashua Honda
My current rides
1975 K5 Planet Blue my summer ride, it was a friend's bike I worked with at the Honda shop in 76, lots of fun to be on it again
1976 K6 Anteres Red rebuilding project, was originally my brother's that I set up from the crate, it'll breath again soon!
Project 750s, 2 K4, 2 K6, 1 K8
2008 GL1800 my daily ride and cross country runner

Prior bikes....
1972 Suzuki GT380 I had charge of it for a year in 1973 while my friend was deployed and learned to love street riding....
New CB450 K7 after my friend returned...
New CB750 K5 Planet Blue, demise by ex cousin in law at 9,000 miles...
New CB750 K6 Anteres Red, to replace the totaled K5, I sold this K6 at 45k in 1983, I had heavily modified it, many great memories on it and have missed it greatly.....
1983 GL1100A, 1999 GL1500 SE, 1999 GL1500A

Offline PeWe

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Re: Cam chain tensioner noise
« Reply #26 on: September 15, 2023, 11:10:34 PM »
Easy to move with kick starter when plugs are out.
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Offline 70CB750

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Re: Cam chain tensioner noise
« Reply #27 on: September 16, 2023, 05:40:46 AM »
One question.  Do you set it 15 past and adjust the tensioner or do you set it at 15 degrees and keep the tension on it while adjusting the tensioner?
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Offline PeWe

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Re: Cam chain tensioner noise
« Reply #28 on: September 16, 2023, 06:09:00 AM »
When crank is at 15*ATDC (as spring tower is located on photo), release tensioner bolt a few turns and tighten it again.
The spring should push the tensioner rod against tensioner metal housing.

Possible to push from rear end and make sure it can move.
Do not push while tighten the tensioner bolt so it will be too tight if that is possible.
« Last Edit: September 16, 2023, 06:14:11 AM by PeWe »
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CB750 K6-76  970cc (Earlier 1005cc JMR Billet block on the shelf waiting for a comeback)
CB750 K2-75 Parts assembled to a stock K2

Updates of the CB750 K6 -1976
http://forums.sohc4.net/index.php/topic,180468.msg2092136.html#msg2092136
The billet block build thread
http://forums.sohc4.net/index.php/topic,49438.msg1863571.html#msg1863571
CB750 K2 -1975  build thread
http://forums.sohc4.net/index.php/topic,168243.msg1948381.html#msg1948381
K2 engine build thread. For a complete CB750 -75
http://forums.sohc4.net/index.php/topic,180088.msg2088008.html#msg2088008
Carb jetting, a long story Mikuni TMR32
http://forums.sohc4.net/index.php/topic,179479.msg2104967.html#msg2104967

Offline 70CB750

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Re: Cam chain tensioner noise
« Reply #29 on: September 16, 2023, 07:22:15 AM »
Quote from: PeWe on September 16, 2023, 06:09:00 AM
When crank is at 15*ATDC (as spring tower is located on photo), release tensioner bolt a few turns and tighten it again.
The spring should push the tensioner rod against tensioner metal housing.

Possible to push from rear end and make sure it can move.
Do not push while tighten the tensioner bolt so it will be too tight if that is possible.

So no tension on the crankshaft.
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Prokop
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I love it when parts come together.

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Offline 77_f2

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Re: Cam chain tensioner noise
« Reply #30 on: September 16, 2023, 07:07:48 PM »
Quote from: newday777 on September 15, 2023, 10:33:41 PM
What ever way you go through the process, do not try to turn over with the plugs in place as you will bend the tiny advancer shaft.

What makes you say that?

There appears to be an off center peg that connects the advancer to the crankshaft.

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Offline scottly

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Re: Cam chain tensioner noise
« Reply #31 on: September 16, 2023, 09:16:35 PM »
Quote from: 77_f2 on September 16, 2023, 07:07:48 PM
Quote from: newday777 on September 15, 2023, 10:33:41 PM
What ever way you go through the process, do not try to turn over with the plugs in place as you will bend the tiny advancer shaft.

What makes you say that?

There appears to be an off center peg that connects the advancer to the crankshaft.
You have much to learn, Grasshopper.
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Offline newday777

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Re: Cam chain tensioner noise
« Reply #32 on: September 17, 2023, 03:35:11 AM »
Quote from: 77_f2 on September 16, 2023, 07:07:48 PM
Quote from: newday777 on September 15, 2023, 10:33:41 PM
What ever way you go through the process, do not try to turn over with the plugs in place as you will bend the tiny advancer shaft.

What makes you say that?

There appears to be an off center peg that connects the advancer to the crankshaft.
That shaft gets off center from someone who has not pulled out the spark plugs so there isn't compression in the motor. Turning the shaft with the 23mm nut with compression puts a bend in the shaft which throws off the advancer cam timing and how your motor runs.
If it's off center then you need to straighten it so the advancer operates correctly. Use a dial indicator with the advancer off the shaft. Runout of less than .006 is acceptable.
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Stu
Honda Parts manager in the mid 1970s Nashua Honda
My current rides
1975 K5 Planet Blue my summer ride, it was a friend's bike I worked with at the Honda shop in 76, lots of fun to be on it again
1976 K6 Anteres Red rebuilding project, was originally my brother's that I set up from the crate, it'll breath again soon!
Project 750s, 2 K4, 2 K6, 1 K8
2008 GL1800 my daily ride and cross country runner

Prior bikes....
1972 Suzuki GT380 I had charge of it for a year in 1973 while my friend was deployed and learned to love street riding....
New CB450 K7 after my friend returned...
New CB750 K5 Planet Blue, demise by ex cousin in law at 9,000 miles...
New CB750 K6 Anteres Red, to replace the totaled K5, I sold this K6 at 45k in 1983, I had heavily modified it, many great memories on it and have missed it greatly.....
1983 GL1100A, 1999 GL1500 SE, 1999 GL1500A

Offline Deltarider

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Re: Cam chain tensioner noise
« Reply #33 on: September 17, 2023, 07:12:35 AM »
Quote from: scottly on September 15, 2023, 08:50:28 PM
[...]
Lots of manuals have the 4 valve, then the other 4 procedure, but the one cylinder at a time method is easier, at least for me. ;)
Also for me.
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Offline Tracksnblades1

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Re: Cam chain tensioner noise
« Reply #34 on: September 17, 2023, 08:15:53 PM »
And if you have a lot of compression you’ll shear the dowel pin or the dowel pin hole in the advance will break out…


Grasshopper turn it with the alternator or the kick starter…
« Last Edit: September 17, 2023, 08:17:28 PM by Tracksnblades1 »
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Offline 77_f2

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Re: Cam chain tensioner noise
« Reply #35 on: September 17, 2023, 08:43:03 PM »
Quote from: newday777 on September 17, 2023, 03:35:11 AM
Quote from: 77_f2 on September 16, 2023, 07:07:48 PM
Quote from: newday777 on September 15, 2023, 10:33:41 PM
What ever way you go through the process, do not try to turn over with the plugs in place as you will bend the tiny advancer shaft.

What makes you say that?

There appears to be an off center peg that connects the advancer to the crankshaft.
That shaft gets off center from someone who has not pulled out the spark plugs so there isn't compression in the motor. Turning the shaft with the 23mm nut with compression puts a bend in the shaft which throws off the advancer cam timing and how your motor runs.
If it's off center then you need to straighten it so the advancer operates correctly. Use a dial indicator with the advancer off the shaft. Runout of less than .006 is acceptable.

I understand that you are saying it takes significantly more torque to turn the crankshaft if the plugs are installed. And this could damage something.

Any time you are applying a fair amount of torque, not supporting the other end of the wrench can cause problems.

I don't take a big ass breaker bar or large torque wrench and just lean on it.

The first time I reinstalled the axle nut on a rear wheel, I almost pivoted the bike over its center stand before I adjusted my technique.
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Offline Tracksnblades1

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Re: Cam chain tensioner noise
« Reply #36 on: September 19, 2023, 03:25:27 PM »
It not how you’re applying the torque… It’s what you’re applying the torque to.

The advancer’s dowl pin is for timing. The dowl pin, the crank hole, and the advancer hole can be damaged when using it to turn the engine over, regardless of technique.

Everyone is trying to help and they know as they read your post what you know.. This site has downloadable service manuals.
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