Author Topic: NGC needle bearing question  (Read 211 times)

Offline Canuck750

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NGC needle bearing question
« on: November 23, 2022, 09:59:42 PM »
I have a couple pressed up crankshafts for a 4 stroke Benelli single, Benelli used the same diameter of the crank pin and the I.D. for the connecting rod big end across a variety of displacements (egg motors 125 / 200 / 250cc).



These motors use needle bearings that are loose fit into an aluminum cage. There are 16 of these hardened rollers that one fits into the cage after slipping the cage over the pin then the con rod over the bearing.

I can't find any NOS Benelli rollers / cages but I did find a complete new needle bearing of the same dimensions (24mm I.D. / 30mm O.D. x 15mm wide) at 123 Bearing in the U.K.



https://www.123bearing.com/bearings-K22-30-15-SKF

Is there any reason why this needle bearing would not be a suitable replacement for this high stress application?
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Online Sye

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Re: NGC needle bearing question
« Reply #1 on: November 24, 2022, 12:48:16 AM »
I see no reason why not. These are commonly used on 2-stroke cranks and con rods and are fitted to my Bridgestone 350 GTR wrist pins.

Offline Old Jock

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Re: NGC needle bearing question
« Reply #2 on: November 24, 2022, 03:47:43 AM »
I would think so too, but what I'd do is to search or enquire directly to SKF explaining the application to see if they have any comments

Offline Canuck750

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Re: NGC needle bearing question
« Reply #3 on: November 24, 2022, 09:06:37 AM »
I would think so too, but what I'd do is to search or enquire directly to SKF explaining the application to see if they have any comments

Good advice, thank you
48 Guzzi Airone, 57 Guzzi Cardellino, 65 Benelli 200 sprite, 66 Aermacchi Sprint, 68 Gilera 106 SS, 72 Eldorado, 72 Benelli 180, 74 Guzzi 750S, 73 Laverda SF1, 74  Benelli 650S, 75 Ducati 860GT, 75 Moto Morini 3-1/2, 78 Moto Morinii 500

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Re: NGC needle bearing question
« Reply #3 on: November 24, 2022, 09:06:37 AM »

Offline tris

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Re: NGC needle bearing question
« Reply #4 on: November 24, 2022, 09:24:53 AM »
I would think so too, but what I'd do is to search or enquire directly to SKF explaining the application to see if they have any comments

 :thumb:
It's also worth checking the old bearing for any numbers as most of them are universal so as long as they match you should be good to go
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Online n3303j

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Re: NGC needle bearing question
« Reply #5 on: November 24, 2022, 09:55:21 AM »
Setup is similar to the BMW /2 crank.
The fellows who were doing the /2 cranks would often re-use the bearing cage as it was rare, and just replace the rollers.
Part of the reconditioning often involved dressing the rod big end with a precision hone
Final fitting was done by installing appropriate diameter rollers.
Seems rollers are available in .0001" increments of diameter.
Ideal fit is about 0.0002" radial play on the rod.
0.002" is still acceptable (HD Manual figure for their crank).
YMMV
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Harper's Moto Guzzi : Go Ride, Break Parts, Call me!
Harper's Moto Guzzi. Where we still answer the phone, use the highest quality parts, and also do Transmission, rear drive, and carb rebuilds fast. Call us at 816.697.3411 and get your problems resolved.
http://www.harpermoto.com
Advertise Here