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 Post subject: 906 Paso Engine Bearing & Seals
PostPosted: Fri Oct 15, 2010 9:30 am 
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Joined: Mon Mar 30, 2009 7:59 pm
Posts: 256
Location: Australia
model: 906 Paso
year: 1989
For those that are contemplating overhauling their Paso engine I have compiled a list of roller bearings and oil seals that are required for the job. The part numbers and detail positions were taken from the original 906 parts catalog.
Enjoy!
Ken (Duc906)

Gearbox
Position.....Ducati Part #....Description.............Size...........Quantity
4.............70120011A.....Split Needle Roller....K24x28x10..........5
17............764020002.....Split Needle Roller....K22x26x10..........1
Clutch
19............46340269A........Oil Seal.............35x47x7.............1
21............751132566........Bearing.............16005................1
23............46370226A........Bearing.............6005..................1
Clutch Cover
17............937842030........Oil Seal............20x30x7..............1
26............46340477A........Oil Seal............75x95x10.............1
Timing (Belt Tensioners)
20............037029350.......Idler Roller...........?**..................2
25............751661238.......Bearing................6201-2RS2/LHT23 ................4
Crank cases
4..............751423380........Bearing.........7207 X2TB (NTN)......1
7..............751302566........Bearing............6305 C3...............2
8..............937832552........Oil Seal............25x52x7..............1
9..............757911747........Bearing............NJ203EC..............2
12............751102054........Bearing.............6004 C3..............1
30............757941542........Bearing..........RNU202 ECP............1
32............751433380........Bearing.........7307 X2TB (NTN).......1
34............937851830........Oil Seal............18x30x7...............1
Water Pump/Alternator Cover
4..............751101747........Bearing............6003 C3..............1
9..............751202374........Bearing.............6001..................2
18............937831524........Oil Seal............15x24x7..............1
26............937831624........Oil Seal............16x24x4..............1 (CORTECO 12010799B)
28............937831625........Oil Seal............16x24x7..............1 (CORTECO 12010801B)
Starter (Driven Gear)
21............061950075.......Needle Roller.....K35x40x13............2
Head Timing (Cams)
12............020470105........Oil Seal............22x35x7..............2
14............751101747........Bearing............6003 C3...............2
19............751102054........Bearing............6004 C3...............2
24............751731542........Bearing............6202 RS1 C3.........2

(As always, this info is given in good faith. All care, no responsibility)

edit by G.:
The waterpump gasket is #78810063A and the same on
Ducati 748 `99 SPS
Ducati 748 SP, Biposto
Ducati 851 Superbike Racing `91
Ducati 851 `90 SP
Ducati 851 `91-`92
Ducati 888 Superbike `92
Ducati 888 `93->
Ducati 906 Paso `88
Ducati 907 I.E. `92
Ducati 916 `94
Ducati 916 Monop.-Senna `95-
Ducati 916 SP `96
Ducati ST 2 `97


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 Post subject: Re: 906 Paso Engine Bearing & Seals
PostPosted: Fri Oct 15, 2010 10:20 am 
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Joined: Sat Sep 18, 2010 8:00 pm
Posts: 136
Location: UK
model: 900 SS
year: 1990
that's brilliant Ken, thank you.


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 Post subject: Re: 906 Paso Engine Bearing & Seals
PostPosted: Fri Oct 15, 2010 10:36 am 
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Joined: Thu Nov 29, 2007 2:38 am
Posts: 293
Location: UK
model: 907 I.E.
year: 1990
Most of the bearings (actually all) can be purchased from the SKF catalogue (the Ducati bearings are SKF standard bearings) for 1/3 of the Ducati list price.

few years back I did two engines, one was my SS-Special750 and the other was an 851 and most of the bearings were the same; the total expenditure was around 130-150 US$ for SKF parts.

it is a little bit fiddly to find all the SKF part numbers as you need to remove all the bearings from the engine, but it is very duable and the saving is substantial.


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 Post subject: Re: 906 Paso Engine Bearing & Seals
PostPosted: Fri Oct 15, 2010 11:22 am 
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paso grand pooh-bah
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Joined: Mon Jul 19, 2004 12:00 am
Posts: 1714
Location: Hudson Valley, NY
model: 750 Paso
year: 1988
Just type the bearing number into google and you will find a good loac source. For example:

http://www1.mscdirect.com/CGI/NNSRCM2?PARTPG=GSDRVSM

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'88 750 Paso * '87 750F1
'04 Multi 1080s * '88 650 Indy
'65 250 Monza - Moto Giro Project

Click HERE--> 750 Paso Tech FAQ
www.desmoducati.org
www.ducatisuite.com


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 Post subject: Re: 906 Paso Engine Bearing & Seals
PostPosted: Fri Oct 15, 2010 2:54 pm 
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Joined: Thu Aug 26, 2010 10:52 pm
Posts: 440
Location: lewes sussex
model: 906 Paso
year: 1991
now thats quite a little list there and the money saving tips are a big help too! just gotta persuade my mechanical mate that he can do it when he gets back from his holidays. what are the most difficult proceedures involved in the complete overhaul? :thumbup: :cool: :)

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1990 906 paso red and white
1991 906 paso black and gold
1997 ST2 red
2004 ccm r30 with 710 conversion
175 moto morini road race replica
a box of bits r100 bmw scrambler project
1962 rover 95 p4
1997 iveco daily
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 Post subject: Re: 906 Paso Engine Bearing & Seals
PostPosted: Fri Oct 15, 2010 4:35 pm 
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Joined: Thu Nov 29, 2007 2:38 am
Posts: 293
Location: UK
model: 907 I.E.
year: 1990
nnnnnnorman wrote:
now thats quite a little list there and the money saving tips are a big help too! just gotta persuade my mechanical mate that he can do it when he gets back from his holidays. what are the most difficult proceedures involved in the complete overhaul? :thumbup: :cool: :)


I guess getting the crankshaft and gearbox tollerances right.

the shop manual explains everything, therefore it shouldn't be an issue.

Of course i assume you have proper tools and you know how to work on engines


Last edited by angelix on Fri Oct 15, 2010 6:34 pm, edited 1 time in total.

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 Post subject: Re: 906 Paso Engine Bearing & Seals
PostPosted: Fri Oct 15, 2010 6:23 pm 
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Joined: Sat Sep 18, 2010 8:00 pm
Posts: 136
Location: UK
model: 900 SS
year: 1990
apart from tolerancing (as mentioned) removing some of the bearings in blind housings can be fun.. aligning crankcases and spigots on re-assembly is another, also fitting pistons to barrels needs plenty of patience until you learn the knack - the expander springs in the oil scraper rings can be hard to compress sometimes. BTW, (in my opinion) I would definitely stick with these type of oil scraper rings and don't be tempted to use the aftermarket st. steel type.


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 Post subject: Re: 906 Paso Engine Bearing & Seals
PostPosted: Fri Oct 15, 2010 6:42 pm 
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Posts: 293
Location: UK
model: 907 I.E.
year: 1990
giocast wrote:
apart from tolerancing (as mentioned) removing some of the bearings in blind housings can be fun.. aligning crankcases and spigots on re-assembly is another, also fitting pistons to barrels needs plenty of patience until you learn the knack - the expander springs in the oil scraper rings can be hard to compress sometimes. BTW, (in my opinion) I would definitely stick with these type of oil scraper rings and don't be tempted to use the aftermarket st. steel type.



For the Pistons the best is fitting them in the cilinders half way leaving exposed the piston pin hole.

then fit the assembly on the conrods remembering to put the seegers correctly and being very carefull with the ORINGS in the oil passages when you push down the barrels on the crankcase.

One thing.... the old engines had a gasket between the two halves of the crankcase, now that has been replaced with a grey silicon paste (Ducati part, you can buy it at the store)

The paste is MUCH better than the old gasket and if put correctly will not leak...


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 Post subject: Re: 906 Paso Engine Bearing & Seals
PostPosted: Fri Oct 15, 2010 7:02 pm 
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Location: UK
model: 900 SS
year: 1990
angelix wrote:


For the Pistons the best is fitting them in the cilinders half way leaving exposed the piston pin hole.


agree.. by far the easiest way - have to remember to nudge the piston down the bore very carefully as in order to fully expose the small end gudgeon pin hole (in piston) ready to fit pin, the oil scraper is extremely close to popping out of the bore! (so back to square one :( )


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 Post subject: Re: 906 Paso Engine Bearing & Seals
PostPosted: Sat Oct 16, 2010 6:59 am 
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Joined: Thu Aug 26, 2010 10:52 pm
Posts: 440
Location: lewes sussex
model: 906 Paso
year: 1991
thanks for the tips guys sounds a little tricky in places!!!!!!!

_________________
1990 906 paso red and white
1991 906 paso black and gold
1997 ST2 red
2004 ccm r30 with 710 conversion
175 moto morini road race replica
a box of bits r100 bmw scrambler project
1962 rover 95 p4
1997 iveco daily
a non running xt600...stator needed


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 Post subject: Re: 906 Paso Engine Bearing & Seals
PostPosted: Sat Oct 16, 2010 10:08 am 
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paso grand pooh-bah

Joined: Thu Jun 21, 2007 12:00 am
Posts: 1450
Location: Gothenburg, SWEDEN
model: 907 I.E.
year: 1991
Quote:
For the Pistons the best is fitting them in the cilinders half way leaving exposed the piston pin hole

+1.

But do put rags over crank, you don`t wanna loose the gudgeon pin clip in there!
It could fly anywhere if you loose it in the critical moment.... :evil:

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907 I.E. -91
M900 -97
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 Post subject: Re: 906 Paso Engine Bearing & Seals
PostPosted: Sat Oct 16, 2010 1:40 pm 
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Location: UK
model: 907 I.E.
year: 1990
Tamburinifan wrote:
Quote:
For the Pistons the best is fitting them in the cilinders half way leaving exposed the piston pin hole

+1.

But do put rags over crank, you don`t wanna loose the gudgeon pin clip in there!
It could fly anywhere if you loose it in the critical moment.... :evil:


yeah right... and keep count of how many you HAVE and how many you FIT....

Long time ago while reassembling my RD350 with Wiseco pistons I ended with a circlip laying around workbench just minutes before starting the engine after a complete overhaul.

So, I had to reopen it (a pain as it implies the removal of the YPVS) and check if all the clips were fitted....

of course those funny guys at wiseco had 5 put in the box (instead of 4) so I opened the engine for nothing... :banghead: :banghead:


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 Post subject: Re: 906 Paso Engine Bearing & Seals
PostPosted: Sat Oct 16, 2010 3:10 pm 
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paso grand pooh-bah

Joined: Thu Jun 21, 2007 12:00 am
Posts: 1450
Location: Gothenburg, SWEDEN
model: 907 I.E.
year: 1991
Quote:
of course those funny guys at wiseco had 5 put in the box (instead of 4) so I opened the engine for nothing...


:lol: :lol:

Blues song Born Under A Bad Sign comes to mind:
"If it wasn`t for bad luck, I wouldn´t have no luck at all"

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907 I.E. -91
M900 -97
MTS 1100s -07


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 Post subject: Re: 906 Paso Engine Bearing & Seals
PostPosted: Sat Oct 16, 2010 10:30 pm 
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Location: Newzealand
model: 906 Paso
year: 1990
Image
This ring compressor has been real handy over the years. The band is about 35mm wide and comes apart, and can be fed in round studs, clamp the rings and slide cylinder over the rings then remove compressor :) :thumbup:

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 Post subject: Re: 906 Paso Engine Bearing & Seals
PostPosted: Sat Oct 16, 2010 10:56 pm 
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paso grand pooh-bah
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Joined: Tue Jul 29, 2008 9:50 pm
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Location: Hilltown,Pennsylvania
model: 906 Paso
year: 1990
a good piece of teflon or delran and a few well placed wire ties can do the trick in a pinch ....... :thumbup:

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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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