Cam Chain open itself!?

hochkoenig

hochkoenig

Senior member
Location
Salzburg-Austria
Hi,
I used to fix a new Closed (DID) to a used Camcain, it opened by itself!
Happy enough to just broke the Cainholder under the Engine only, the Valves and Pistons survived luckly!!
How is this possible?
May I use better 2 Segering instead of this silly Closedsection?
Any thoughts or experements?
 
It is very bad practice to fit a new link into an old chain, the link will
sometimes fail.

The drive will try to take up the difference in wear between the worn
chain and the new pins in the joining link.
 
zlk1.jpg


would make it sense to install sometrhing like this?



Uploaded with ImageShack.us

 
New link in new chain..............good
Old link in old chain.................good
Old link with new clip...............good
New link in old chain................bad


I have never heard of an iwis clip letting go but there
are many steel qualities. I change the clips on all RK
and Regina chains I sell for iwis clips.......I like to sleep
at night.
 
the spring clips as one piece (open loop) are very good and have been proven time and time again, the later type which use two clips (in UK called E clips) are even better, think about it, even if one came off the chain would (probably) not let go, and with the old type there is contact for about 270 degrees on one clip pin's grrove, and then two contact points at,not much more than a tangent on the other pin's groove, but with Laverda cam chains the double E clip type is very fiddly and with ages tired eyes, wobbly shaking hands and no common sense they are best avoided, unless your day job is mending ladies 8mm diameted watches.
CLEM
 
It also matters in which direction the clip is fitted, and on which side of the chain in the case of triples... ::)

Why not a complete new chain in the first place?  New clip on worn chain is saving at the wrong end, or is it learning by doing?

piet
 
Yes, in this case it was "learning by doing", I thought the Cain looks OK, just missing the Lock...   :(
Of course the Clip opens backwards, but it was closing verry easy, it was a new DID...
What you mean of Site of Chain, I fix the Clip allways on the right hand Site
 
May be related, ?
But, Doing the yearly service and checking the valve clearance's, I noticed what appeared to look like tree growth rings on the top of the the cam lobes and the surface of the Valve Tappet (covers) where the lobes ride. very faint, the clearances where OK, not perfect. This appeared on both cams.
It has a new regina cam chain a several thousand ks. The bike is a Series 2 Jota.

Any feed back would be appreciated, regards Ian.
 
Good question, does it matter? I put mine on the left, like Keith, but only because that is how it's shown in the workshop manual.
 
That's what I thought; although it would be easier to whack it on the right side, the manual may show it on the left for a reason - clearance.
Lasted 300,000 kms on the left, why tempt fate?
 
I have the connecting links with the C clips, very fiddily, easy to loose.

As I have said the quality of the steel is important and there are some
really poor ones out there.
 
motoddrob said:
I'm a lefty as well. Could it be that the right side has less clearance than the left where the cases are split.
Click to expand...

good guess, is exactly why you install it on the left
you often see cam chain damage on the main bearing boss when you strip an engine



 
I wonder how many of you just had a panic check of your rebuild photos to see which side you put your link.

I could have sworn mine was on the right as it seemed the easiest side to fit it...but no. There it is on the left  :D

Maybe I also looked in the manual at the time.
 
Ian D said:
May be related, ?
But, Doing the yearly service and checking the valve clearance's, I noticed what appeared to look like tree growth rings on the top of the the cam lobes and the surface of the Valve Tappet (covers) where the lobes ride. very faint, the clearances where OK, not perfect. This appeared on both cams.
It has a new regina cam chain a several thousand ks. The bike is a Series 2 Jota.
Click to expand...

Not related at all...

I suspect it has something to do with oil quality and/or how long the oil change intervals were.

The wear on the followers is quite common, largely dependant on valve clearance (maintenance :D) and overall lobe condition.  I've come across numerous cams with flats worn at the top of the lobes, likewise severely buckled tappet surfaces.  Both conditions usually result from shoddy maintenance routine and/or poor oil quality.  Overly strong or binding valve springs can also cause premature wear of both lobe and follower.

piet
 
color=red]Not related at all...

I suspect it has something to do with oil quality and/or how long the oil change intervals were.

The wear on the followers is quite common, largely dependant on valve clearance (maintenance :D) and overall lobe condition.  I've come across numerous cams with flats worn at the top of the lobes, likewise severely buckled tappet surfaces.  Both conditions usually result from shoddy maintenance routine and/or poor oil quality.  Overly strong or binding valve springs can also cause premature wear of both lobe and follower.
piet[/color]
Harsh words indeed, but sometimes needed, and I didn't think it would be related.
My service intervals are as per the Green Book (revised), and followed pretty bloody closely.
The last 12mth/16,000k service was 3,260 k's ago, with an oil change & 2,000 k service at 1,500k's.
The only variable was the oil.
I have been using Shell Advance SX 4T 15w-50, Mineral Motor Oil with DPA. Which is in the bike now.
this was the oil that was recommended by the Ducati dealer when I bought the bike.
Shell changed the shape and colour of the outer packaging, and now call it AX5 4T 15w-50,
Premium Mineral 4 Stroke Oil, the sales rep. assured a local bike shop it was the same oil.
This was the oil I used at the last change, and have just drained from the bike.

The marks on the cams etc are first time I've seen this, and I do look for abnormalities every time.
Piet, your reply is appreciated and has prompted a review of my service routine.





 
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