need pictures of cambelt pulleys

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paso750
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need pictures of cambelt pulleys

Post by paso750 »

if someone has the belt covers removed could you make a picture of the camshaft and driving pulleys?
I noticed that my belts hang off the camshaft pulleys by 1-2mm. About as much as the thread of the camshaft is showing. The nut of the driving pulley sits on the end of the thread. Looking at the position of the belt on the tensioner pulley it seems the driving pulleys are a bit further out than the camshaft pulleys.

G.
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randtcastell
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Re: need pictures of cambelt pulleys

Post by randtcastell »

This is what I have:

Image

Image
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paso750
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Re: need pictures of cambelt pulleys

Post by paso750 »

thank you very much! Do your belts run centered on the idler and tensioner pulley?
Mine don`t. Moving the driving pulleys inward would correct that but looking at your pictures it seems they are in the same position as mine (there`s no remaining thread visible) which would indicate that my camshaft pulleys should move outwards but then I doubt that the belts not running in the middle of idler and tensioner pulley is normal. :huh:
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randtcastell
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Re: need pictures of cambelt pulleys

Post by randtcastell »

These are old photos, but they may help a bit. I can take new photo closeups of the idler and tensioner pulleys if you need them. Just let me know I could do it tomorrow.

Image

Image

I think someone more knowledgeable on this forum will be of help clarifying this issue. Good luck!
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Brutus
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Re: need pictures of cambelt pulleys

Post by Brutus »

Gerhard, here's a picture of the pulley on the vertical head.
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Re: need pictures of cambelt pulleys

Post by higgy »

Hey G
Didn't you change your cams at some point ?
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Re: need pictures of cambelt pulleys

Post by paso750 »

yes I did but that belt offset of course remained. I finally want to figure out what causes it.
Thanks again for the pictures. It would be nice to see some that show the pulleys and belt from the top or bottom to get a better picture of the position of the belt on the idler and tensioner pulley.
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Re: need pictures of cambelt pulleys

Post by higgy »

If it was there to begin with I'd have to remove the crankshaft pulley and see what the issue is. The rest all seems to look the same in terms of overriding the pulleys and rollers. How do things line up on the other side of the crank ?
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Re: need pictures of cambelt pulleys

Post by Mc tool »

higgy wrote: How do things line up on the other side of the crank ?
Yeah , that's what I was thinkin' but I didn't want to say it. Kinda makes me think that if the cam pulleys and the idlers both appear to be in line .... its more likely that the bottom pulleys on the jack shaft are the ones out of line. :(
I wish I was young again............Id be heaps smarter than last time
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Re: need pictures of cambelt pulleys

Post by higgy »

:thumbup: jack, crank it all a shaft something is shimmed in the wrong place or

with the wrong shim

got a new one for Hamish....Image
Ducati,making mechanics out of riders since 1946
There's no problem so bad that a little fixing can't make it worse! : )
If it ain't broke keep fixin it till it is
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Re: need pictures of cambelt pulleys

Post by paso750 »

If it was there to begin with I'd have to remove the crankshaft pulley and see what the issue is.
crankshaft pulley? :truck: On my crankshaft there`s the alternator on one side and the clutch on the other ;)
How do things line up on the other side of the crank ?
:?:

The original shims for the driving pulleys are 0.2 or 0.5mm. I doubt it would make a noticable difference swapping one with the other as the belts are hanging 1-2mm off.
I`ve received the pulley tool a few days ago (bought this one as it`s the cheapest I could find http://www.ebay.co.uk/itm/Laser-5341-Ca ... 534800956?). Now I just need to find the motivation to pull the belts off again. It`s currently 0-5°C and not too much warmer in the garage.
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Re: need pictures of cambelt pulleys

Post by higgy »

I have a 906 crankcase split I'll take a look maybe give me some idea of what to look for

crankshaft pulley? :truck: On my crankshaft there`s the alternator on one side and the clutch on the other ;)

yeah yeah I get it :drunk:


update: 906 appears to be a little different,timing shaft protrudes further past the timing belt drive gears and their nut

Still curious how the gears on the other end line up :wacko: assuming they line up good it has to be the thrust washers, or some other oddball issue like cylinder and head alignment. Don't remember if you bored or replaced the cylinders ?
Adjustible cam belt pulleys (changed all other pulleys from square to round teeth)
How did they line up before you changed them ?

It does appear the timing shaft is captured in the case halves on the drive side, did you tighten that end first ?
If so I guess your only viable option is loose the thrust washers you have installed for some much thinner ones to get the alignment kosher


Image

Hey I just noticed the timing gears don't line up very well on this spare case half :fart:
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Re: need pictures of cambelt pulleys

Post by Mc tool »

paso750 wrote: crankshaft pulley? :truck: On my crankshaft there`s the alternator on one side and the clutch on the other ;)
.
You have a clutch on your crankshaft ? :D
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Re: need pictures of cambelt pulleys

Post by higgy »

Image


jeez :phone:

You have a clutch on your crankshaft ? :D

knee bone's connected to the thigh bone,thigh bones connected to the............... :banghead:
Ducati,making mechanics out of riders since 1946
There's no problem so bad that a little fixing can't make it worse! : )
If it ain't broke keep fixin it till it is
88 750
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92 907ie
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paso750
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Re: need pictures of cambelt pulleys

Post by paso750 »

Now that`s an interesting picture :)

I don`t remember how the pulleys aligned with the old belts and pulleys. Also I let a shop do the whole engine rebuild so there`s not much I can say about it.
Hey I just noticed the timing gears don't line up very well on this spare case half
I`ve found some topics on other Duc forums about that. At least that lines up on my engine.
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