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Timing Chain question

  • Thread starter Thread starter Anonymous
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Anonymous

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I have a 83 GS550Es and I was wondering what is the spring loaded dial for behind the engine in the center. Someone told me it was the timing chain tightener, what is this for and should I adjust it
Also I am geting a ticking noise from the left side of the motor when I get on the gas it sounds like a valve tap. Just wondering if anyone has any ideas
Thanks
Eric
 
Yep, thats a chain tensioner, more specifically the cam chain tensioner.
I can tell you what is for (and not so much how to set it). It is to press against a rail that presses against the chain that goes from the cranksaft up to and over the cam shafts (exhaust and intake vavle cam shafts), it pushes on the chain to keep it from slapping around (and chain slides along on that rail). If the tensioner is set way wrong or is stuck, then the chain will slap around and make real bad engine sounds enough to alert you to the problem, acatully make you think something is about to or already has come apart.
Since you didnt state any such engine noises (it would be lot more than 'ticking'), I dont suspect there is a problem.

Perhaps others will suggest an easy way to check the setting without going all thru the setup, have seen such posting in the past.

WHen I replaced the head gasket, I set tensioner step by step by following steps in Clymers manaul (without really understanding it).
 
Re: Timing Chain question

That housing with the spring loaded knurled knob is the automatic cam chain tensioner. It is not adjustable. The only outcome of trying to adjust it is that you will render it inoperative. To check and re-set it to re-engage and operate normally. You must.......................

Loosen the jamb nut on the left side. Turn in the slotted screw in the middle of the jamb nut until it contacts the internal plunger shaft and stops.
cinch it down lightly to hold the internal shaft. Hold the slotted screw in that position and turn down the jamb nut. Remove the 2 (sometimes 3) bolts that hold the cam chain housing to the rear of the cylinderhead.
Remove the complete assembly. Loosen the jamb nut, then the slotted shaft you tightened. The spring loaded plunger will slide out. Inspect the plunger shaft and spring for nicks or damage. Clean as needed. Insert spring/plunger assembly back into tensioner body. Press plunger into tensioner body with you thumb. The tensioner will only go halfway down.
Turn the large knurled knob on the right side of the tensioner counterclockwise. This will allow the plunger to fully recess. Let go of the knurled knob while holding down the plunger in the fully recessed position with your thumb. Ease off pressure with your thumb. You should see the knurled wheel turn and the spring underneath the knurled wheel rewind itself. If it does, then the auto function is working properly. Press on the plunger and turn the spring loaded wheel again so as to be able to press the plunger fully into the housing. Hold the plunger fully depressed. Turn the slotted screw down until it contacts the plunger shaft and locks the plunger in the recessed position. Remount the cam chain tensioner body to the cylinder head. Turn the slotted screw 1 turn out. This will release the plunger to make contact with the cam chain and provide tension. Tighten the jamb nut while holding a screwdriver in the slotted screw.
The slotted screw must not be turned as the jamb nut is tightened.
NEVER turn the knurled knob on the right side of the cam chain tensioner.
The tensioner is NOT re-settable when installed in the bike and it will not resume automatic operation if you turn that knob while it IS installed.

Earl


reem98 said:
I have a 83 GS550Es and I was wondering what is the spring loaded dial for behind the engine in the center. Someone told me it was the timing chain tightener, what is this for and should I adjust it
Also I am geting a ticking noise from the left side of the motor when I get on the gas it sounds like a valve tap. Just wondering if anyone has any ideas
Thanks
Eric
Click to expand...
 
so if my buddy turned the knob towards the back of the bike as to loosen then he might have messed it up
 
Earl, guess what I gotta do this week!

That was the most clear explanation of why you don't fool around with the 'big knurled nut' yet. And an excellent description of how to reset the tensioner...which should take care of a bit of a rattle... :oops: .

In my defense I'll bet dollars to donuts I'm not the only one, too!
 
Yep, he SCREWED it up! I sometimes wonder where the logic is in ...........
if you dont know what it is or how it works, its reasonable to assume to know how to adjust or fix it? :-)

Earl


reem98 said:
so if my buddy turned the knob towards the back of the bike as to loosen then he might have messed it up
Click to expand...
 
Heh heh, I guess the moral to this story is, never twist your nuts, you wont like the result. :-) :-)

Earl


jimcor said:
Earl, guess what I gotta do this week!

That was the most clear explanation of why you don't fool around with the 'big knurled nut' yet. And an excellent description of how to reset the tensioner...which should take care of a bit of a rattle... :oops: .

In my defense I'll bet dollars to donuts I'm not the only one, too!
Click to expand...
 
thanks earl!

I didnt screw around with it, because I knew that it would screw it up, but atleast I know how to clean it , and see if its working!....sometimes that thing can really rattle (worsens as temp goes down.)

excellent instruction!
 
I am guessing that if it rattles, the plunger is not following the camchain precisely to keep tension equal. Probably just need to remove the plunger, clean it up, check for/remove rough spots on the rod and oil it well before reinstalling.

Earl


Poot said:
thanks earl!

I didnt screw around with it, because I knew that it would screw it up, but atleast I know how to clean it , and see if its working!....sometimes that thing can really rattle (worsens as temp goes down.)

excellent instruction!
Click to expand...
 
Can the timing chain tensioner be reset from the outside of the motor or am I gona have to get in the motor to reset it
I'm gona have to kick my buddy for touching that
that would explain that new noise
 
bwringer said:
My cam chain tensioner rebuild, with more info and lotsa pictures:

http://bwringer.com/gs/camchaintens.html

Yours may look different, but the principles are the same.
Click to expand...

Nice descriptive site, Brian!

Now I think the last time I fooled with the tensioner I was able to get to it without removing the carbs with a combination of extensions and u-joints. Hmmm, hope so anyway.
 
reem98 said:
Can the timing chain tensioner be reset from the outside of the motor or am I gona have to get in the motor to reset it
I'm gona have to kick my buddy for touching that
that would explain that new noise
Click to expand...

No reem, as Earl explained the tensioner cannot be reset except by removing and basically 'recocking it'. At least you have a buddy to kick...where's the damn cat. (just kiddin' I don't have a cat :wink: )
 
Yes, it is possible to remove the tensioner, clean/reset it and reinstall.. I have done that on my 750. It is NOT easy though. It may not be possible on all GS models.

Earl


Poot said:
Is it possible to clean the rod, without thaking the carbs off?
Click to expand...
 
Yeah, I was thinking if you had those really short stubby screwdrivers, then you could get at it...
 
My cam chain tensioner is held in place with hex head bolts. A 1/4" drive ratchet to break it loose seems to work best, then just the socket and 3" extension between my fingers to turn the bolts.

Earl

Poot said:
Yeah, I was thinking if you had those really short stubby screwdrivers, then you could get at it...
Click to expand...
 
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