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I Have the factory manual From Honda for a 1990 CBR 1000F it has a very too short, bit in the alternator chain. from what I understand this little 1 acorn nut cap should be right at that chain. Is this an adjustment Cap?
I put 3 pix focusing in on the cap.
Thank you all very much
Cycle Madness Back of Engine Focus in just to the right of center, down a bit Cap with single Acorn nut. What is this cap for?
No. It is the "Alternator chamber cover". When you remove it, you have access to the alternator shaft nut, which holds the alternator shaft in position.
From your photos, your alternator is missing.
If you have a Honda Service manual, go to sections 10-16 and 10-17 for info.
The alternator tensioner (the alternator drive chain is NOT a cam chain), is inside the motor. Cases need to be separated to get to it.
@dmoh The pix is is just a engine on Ebay I found to ask the Question. I am researching my chain rattle. My Bike is still together, so I could not get a pix from my bike. I am trying to learn as much as I can befor I start this little adventure into my engine. I will look up that section in the service manual and study more! Thanks so much! I Appreciate it.
I am researching my chain rattle.
Cycle Madness[/QUOTE]
The most common internal chain rattle from these bikes is the cam chain. It is caused by the cam chain tensioner failing. There are many threads on replacing and/or improving the cam chain tensioner.
The cam chain noise is most common at startup as a rattle at the top of the engine that sometimes goes away when the engine warms.
An alternator chain noise, possibly caused by a failed or incorrectly installed tensioner, is quite different. Someone who knows these models may be able to help you identify which component requires attention on your bike.
A cam chain tensioner replacement is fairly straightforward compared to the alternator drive chain tensioner replacement job.
@dmoh Very Interesting about the Cam Chain "noise sometimes goes away when the engine warms" That is exactly as mine is doing. I figured it was Alt Chain as the battery recovered from the start. I may just pop a cam tensioner in it and listen. I was going to do both anyway when the Engine was out of the bike. I'm out nothing if I am wrong but everything to gain if your right!!! It is good to take a step back and do it one at a time anyway to isolate noise. I like your thoughts.
Have you any experience with the master-link type Cam Chains. or a one piece chain. A one piece would require lifting the Crank out of the bearings but the master-link looks like a good Option, but installer failure is higher. I would worry about making a tight spot. any experience in that department?
The Alt tensioner has never been out. My Brother had the bike the first part of its life and now it is my turn. We are orig owners so to speak. the good part is we know the history. It has 61k but my Bro is even more insane about maintenance than me. Regular fluid changes were the norm.
Many riders just accept a slightly noisy cam chain, and wait until it really sounds bad before doing the job. Apparently there is no harm done to the engine from a slightly noisy cam chain. Others may disagree.
I've got no experience with replacement chains. If it was me, I wouldn't touch the alternator chain and tensioner if it's OK. Why split the cases if it's not necessary. There is no service requirement for the alternator chain and tensioner.
What does fail regularly in that area is the little clutch on the alternator shaft, referred to by Honda as the Alternator Damper assembly. When it fails, you can't start the engine with the starter motor. It's still available from Honda.
I'd recommend you replace that and have some peace of mind for the next 61k.
@dmoh Appreciate your thoughts, your Idea is good, to step in slowly. With this new Info, I would think focus on the cam chain because you can get there easily. Address some of those components and see if that fixes the issue. Then if it fixes it no need to go deeper.when I get the work done in the next few weeks and will report back what the success is.
is this an Alternator cam chain adjustment cap?
