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24-12-2018, 11:41 AM | #1 |
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Cam belt one tooth out?
I've just had a frustrating couple of days with my 796. For the second time I have fitted new can belts, no problem done this before. After that a new set of starter cables (both from Exact Fit).
The problem now is that it is not very happy, it will fire up but is running very lumpy and will not tick over. The plugs are coming out back with fuel. I did lock the cams in position with 6mm Drill bits to stop them moving once I had rotated the rear wheel to reach TDC, but has something moved? I'm not sure the horizontal cylinder may be one tooth out, the alignment looks wrong. Had any one got any ideas? Last edited by alickswud; 24-12-2018 at 01:09 PM.. |
24-12-2018, 12:15 PM | #2 |
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Did you mark the old belts and count the teeth?
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24-12-2018, 02:48 PM | #3 |
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I've just re-checked it all. Moved both cams in to position using the rear wheel and I find that the crank pulley is not lined up to the mark on the crankcase.
So take both belts back off and move the crank pulley into the correct position, check the cam pulleys have not moved and re-fit the belts. Check the tension etc and fire it back up. Sounds like it's only running on one now even worse than before! |
24-12-2018, 03:48 PM | #4 |
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Join Date: Feb 2009
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If it's now sounding like it's only running on one cylinder is it possible you are 180 out on one of the cylinder's? I can't remember if you can do it on a Ducati L twin, I know that you can on an aprilia V twin.
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24-12-2018, 04:42 PM | #5 | |
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Quote:
This makes sense. Not that I'm Questioning Utopia.
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24-12-2018, 04:59 PM | #6 |
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I'm assuming that the 796 parts are the same as my Evo.
When you locked the camshafts, did you lock both at the same time or just one? The belts should be changed with the horizontal cylinder at TDC. If you lock both cams, then the locking pins will only locate in their holes when the motor is in the correct position - if only one pin is used, then the motor could be in the wrong position. Also, even if you lock both cams, if you don't also lock the crankshaft, there's a possibility that you might accidentally move the crank out of position when refitting the belts. Finally, when tensioning the belts, (and while both cams are locked), you need to loosen the three torx bolts (no. 4 in the diagram) on each cam pulley so that you can correctly tension the belt run opposite the moveable tensioner. As you can see from the diagram, the pulleys themselves are slotted and can rotate slightly independently of the cams so that you can evenly tension both sides of the belt, (without affecting the cam timing). If you don't do this, then you are effectively only able to adjust the tension of the side running against the moving tensioner. When finished, tighten the torx bolts up to 10Nm. What utopia says is very good practice - any time you disturb the belts, it's wise to rotate the engine a few times by hand (plugs out) to ensure there's no contact between valves and piston. |
24-12-2018, 04:20 PM | #7 |
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Before I start mine up after a belt change I always rotate the engine (in the direction it runs) by a couple of cycles, before re-aligning the pulley marks to check that all is as it should be.
Did you do that ? |
24-12-2018, 05:07 PM | #8 |
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I'm gettin the willy's now. My first ever cam belt change next week.
Encyclopaedia Ludditica frightens me....... In a nice way. I should know more, but I don't.
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Always remember. Your home is at risk if you set fire to it. Last edited by Mossleymonster; 24-12-2018 at 05:17 PM.. |
24-12-2018, 06:52 PM | #9 |
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When I looked at the belts today today I locked both cam pulleys, I then saw that the crank pulley was not lined up with the mark so I removed both belts and moved the crank pulley so it lined up.
But I had tightened up the slip bolts on the cam pulleys before doing the tension. I'll take another look on Wednesday when I get the chance. I'm being to wonder if I have bent a valve or something similar. Is it possible to tell by eye? |
24-12-2018, 08:42 PM | #10 | |
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Quote:
Just remember to remove the pins before you try to turn over the motor! |
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24-12-2018, 09:06 PM | #11 | |
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Quote:
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24-12-2018, 09:55 PM | #12 |
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25-12-2018, 08:39 AM | #13 |
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I'll spend some time tomorrow going back to square one. I'm sure I have carried out the correct sequence of events but something somewhere must have moved.
I had locked the cams with Drill bits, checked the belt tension and then turned the engine over by hand before starting. Fingers crossed nothing is bent, I commute daily on the Monster! Last edited by alickswud; 25-12-2018 at 08:41 AM.. |
25-12-2018, 09:14 AM | #14 |
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There are a couple of you tube vids you could take a look at to help.
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25-12-2018, 09:16 AM | #15 |
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It's probably worth just checking to see if you have inadvertently disturbed an electrical connection somewhere... Easily done when you're working on the bike.
Give all the connectors you can find, a good wiggle and push together, especially all the connectors to the coils and injectors ect.
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