Centauro pump gear

[Phil G]

26000 miles, showing some wear but not as bad as I expected, bit of play on the pump shaft.
Yet to pull the top gear off, (do I need to pull the bearing then the gear or will they both come off together?).
Chain drive set off an 1100 cali going in.
Cheers Phil

[Chuck in Indiana]

I went out to the Guzzi Garage (tm) and had a look at the shop manual, but they don't say anything about the bearing. They just say to remove the gear. I've replaced the gears before, and (ahem) don't remember a problem doing it.. but I'm old and *may* have forgotten.

[Daniel Kalal]

for reference...  (that you don't probably need)

Conversion from timing gears to timing chain (including oil pump)

12001200   $6.12   timing cover gasket
90402840   $8.91 (each)   timing cover seal ring (2)
90706188   $1.32   service shaft o-ring
01054500   $182.26   service shaft timing gear
14072001   $116.93   crankshaft timing gear
28058060   $82.77   timing chain
30057810   $108.09   timing chain tensioner
30146400   $375.32   oil pump, complete
95120085   $0.35   oil pump spring washer
30147700   $107.89   oil pump timing gear
13148300    $3.76   oil pump shaft key

[Old Jock]

You can pull them off seperatley or together. The bearing comes off very easily, the gear not so easily but its not too hard.

The oil pump is on a Woodruff key and taper and in my experience is the hardest to pull but it does come off eventually (usually with a small bang as the taper breaks)

I assume you know about the problems with the oil pump

[Daniel Kalal]

As a fatigue engineer, I look at this part and cringe.  Sometimes adding holes to save weight is just not a good direction to go if you're building something other than a race bike...

[Tusayan]

It’s a design apparently produced without any engineering review.  The lightening holes remove a totally inconsequential amount of weight while introducing a much higher stress.  When Joe Caruso produced his first steel replacement gear sets he made them exactly the same as OEM except for the material change.  I made some suggestions in relation to changing the hole geometry and I believe the design for the second batch of gears was updated.

[5154guzzi]

Here`s a new link for pics, info and contact info for Joe Caruso`s Steel Alloy replacement gears , He has steel gears for the Daytona/Centauro as well as new upgraded oil pumps with the 20mm hi volume gears.


  https://woodburymotomedia.com/moto-guzzi-timing-gears-by-joe-caruso/

[Phil G]

Thanks for the replies,  would love the Caruso conversion,  but not in a position to make it happen,  chain drive most probably going in👍😎

[weevee]

Hi Phil.  I'm in Wearside, just up the road from you.  I fitted Joe Caruso's gears to my Daytona motor recently, and both the bearing and the gear came free of the shaft very easily. 

You've been lucky to have found only minimum wear, though.  Here's how loose I found the oil pump gear to be on my bike's engine: https://www.youtube.com/watch?v=BEKT8Nz15DQ

Regarding steel gears & their weight..  I weighed mine before I fitted them, and found they were almost exactly three times as heavy as the OEM gears.  Stronger, by far, but they probably add as much rotational momentum as the lightened flywheel eliminated! 

[Chuck in Indiana]

Hi Phil.  I'm in Wearside, just up the road from you.  I fitted Joe Caruso's gears to my Daytona motor recently, and both the bearing and the gear came free of the shaft very easily. 

You've been lucky to have found only minimum wear, though.  Here's how loose I found the oil pump gear to be on my bike's engine: https://www.youtube.com/watch?v=BEKT8Nz15DQ

Regarding steel gears & their weight..  I weighed mine before I fitted them, and found they were almost exactly three times as heavy as the OEM gears.  Stronger, by far, but they probably add as much rotational momentum as the lightened flywheel eliminated!

Eeks! Now, that's bad..

[Wayne Orwig]

As a fatigue engineer, I look at this part and cringe.  Sometimes adding holes to save weight is just not a good direction to go if you're building something other than a race bike...

That looks like mine did. (is that my picture?)
On mine, the teeth were so badly worn, possibly related to the oil pump shaft wear, that it would not have improved anything if the holes were not there. Once the gear tooth is gone far enough to let the tips of the teeth catch each other, something is going to explode.
See in the circled area.

[Phil G]

Getting there, crank nut undone, big gear pulled, looking like I only need to drill another hole in the cali chain wheel then do a trial fit.
Play on oil pump was minimal,  it was always run on quality fully synthetic 

[JJ]

I have these Joe Caruso "alloy-steel" gears on my '98 Centauro GT!!

[Phil G]

Hole drilled, all lines up in trial fit