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Old April 3rd, 2010, 11:36 PM   #1
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1098 Belt adjustment for correct timing

Well, what started out as a simple belt inspection turned into a full-day belt and timing adjustment.
For those considering doing the belt replacement might find these method useful.

Note: I'm not a Ducati mechanic, so can't guarantee everything on this thread to be 100% correct. Anyone with in-depth knowledge, please feel free to share with us.


Here is the start line. You need to remove fairings, seat, fuel tank, belt cover, spark plugs etc... Relatively easy but time consuming.

Once you get the belt covers off, put in 6th gear and align the timing mark on the driveshaft pulley by turning the rear wheel manually. (second picture, red circle)

The driveshaft pulley makes one revolution for one cycle (one cycle: intake, compression, ignition and exhaust) so when aligned, the HORIZONTAL piston is always at TDC of its power stroke.
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Old April 3rd, 2010, 11:43 PM   #2
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so is that it ?
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Old April 3rd, 2010, 11:50 PM   #3
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continued

Now this got me lost for a while.
I believe on pre-1098 models, all the markings line up when aligned (blue circles to blue lines).
But as you can see in the picture (blue circles), 1098 doesn't work that way. Markings (blue circles) don't line up to the blue lines.

It seems all cams are installed correctly. (second picture, all three markings line up)

What lines up though, are the cam shafts (red circles)
Hmm... it got me thinking, let's check on the vertical then.


Green Circle indicates the direction of the tensioner. Counterclockwise to tighten the belt. (vertical cylinder tensioner was installed the wrong way)
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Old April 4th, 2010, 12:01 AM   #4
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continued

This is the vertical cylinder set at TDC of its power stroke. (270 degrees apart from the horizontal cylinder)

Cam shaft positions are different than the horizontal cam shafts. Hmmm.. lost again..
So I took some pictures of the actual cams at TDC of its power stroke.
Pic 2 is horizontal, pic 3 is vertical.
They are differently positioned, aren't they?

got me thinking again.
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Old April 4th, 2010, 01:13 AM   #5
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continued

So I loosened the tensioner, lotated correctly (ccw), and retarded the camshaft pulley by one teeth.

The positions of actual cams are now identical between horizontal and vertical, but I had to make sure I made a correct adjustment.

According to the service manual,

Intake:
Opening 15° B.T.D.C.
Closing 58° A.B.D.C

Exhaust:
Opening 60° B.B.D.C.
Closing 20° A.T.D.C.

I downloaded and printed out a 360 degree protractor and spray glued to a cardboard (I'm cheap)
Removed Crankshaft cover on the left side of the engine and installed the home-made timing check tool with a bolt and some spacers. Position a needle as an indicator. (Aluminum rivet with duct tape worked for me)

Turning the rear wheel by hand, monitor the head assembly.
The Vertical cyclinder Intake, opening at 15° Before TDC (of its INTAKE STAGE, not power stroke), cam starts to push down on the opening rocker arm.
Closing at 58° After BDC, cam closes the intake valves.


I did this for both cylinders multiple times, intake and exhaust, because the slightest rotation of cams could result in incorrect readings.
After numerous measurements, I concluded that all camshaft pullies are in correct position, and retarding the vertical cylinder cam pullies by one teeth was a valid adjustment.

One exception was Intake Closing. According to the manual, closing is at 58° ABDC, but it actually closes at 68° ABDC. (both cylinder indicated this)
All the other numbers were correct so my guess is that it's either a typo or an update after the manual was published.

Now I can go to my bed feeling warm and fuzzy,

BTW, timing belt was in good condition.
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Last edited by subbie79; April 4th, 2010 at 01:18 AM.
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Old April 5th, 2010, 11:12 AM   #6
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do all these number carry over to the 1198 as well im needing to do this and im willing to try
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Old April 5th, 2010, 11:17 AM   #7
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did you ride the bike after doing all this?
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Old April 5th, 2010, 09:43 PM   #8
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Quote:
Originally Posted by Mr Jurassic View Post
do all these number carry over to the 1198 as well im needing to do this and im willing to try
Your guess is as good as mine. Maybe someone with a 1198 service manual can confirm them?


Quote:
Originally Posted by devimau View Post
did you ride the bike after doing all this?
Yes, I did.
Rolling out of my garage in first gear, I immidiately noticed smoother engine power/pulse. Clutch engagement was much easier to modulate, shudder at low RPM was less severe. (I found myself upshifting early because of the engine getting out of its vibrating range early)

I also noticed more power in 2nd gear. (only because it was a short ride and couldn't find a place to stretch its leg)
I wanted to see if the engine ran any cooler, but the ambient temperature was lower than usual so no direct comparison.

I found this on our sister web site a day after I did this adjustment.
http://www.ducati-superbikes.com/for...ad.php?t=20255
Maybe I shoul invest in one of those gauges. It is such a great video.

.

Last edited by subbie79; April 5th, 2010 at 10:00 PM.
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Old April 6th, 2010, 08:40 AM   #9
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did you loosended up the bolts on the pulleys or just moved the belts one toth?
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Old April 6th, 2010, 08:42 AM   #10
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what year is your bike?
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