CUSCINETTI

NORTON COMMANDO BEARINGS

quali cuscinetti monta il Commando?

RUOTE

Ruota anteriore - 2 cuscinetti

nr. 1 cuscinetto 6203     17 X 40 X 12 Single Row Deep groove Ball

Part Number:     06-5542

nr. 1 cuscinetto 4203     17 X 40 X 16 Double Row Deep groove Ball (posizionato sul lato disco)

Part Number:     06-7688

Ruota posteriore (pre MkIII) 3 cuscinetti

mozzo ruota

nr. 2 cuscinetti 6203     17 X 40 X 12 Single Row Deep groove Ball

Part Number:     06-5542

freno a tamburo

nr. 1 cuscinetto 4203     17 X 40 X 16  Double Row Deep groove Ball

Part Number:     06-7688

codici dei cuscinetti: 
Il codice 6203 indica un cuscinetto a fila singola di dimensioni 17 X 40 X 12, 6203 è cioè un numero universale per questa dimensione di cuscinetto, indipendentemente dalla marca.

POST CORRELATI

Tutorial sostituzione cuscinetti ruote

CUSCINETTI DI STERZO

nr. 2 cuscinetti 6205     25 X 52 X 15 Single Row Deep groove Ball

Part Number:     06-7604

MOTORE

Crankshaft 

consigliato come upgrade

nr. 2 cuscinetti NJ306E C3, 30 X 72 X 19 Cylindrical Roller Bearing 

Part Number:     06-4118
i cosidetti superblend disponibili con gabbia rulli in ottone, acciaio e poliammide. Sono da preferire sempre quelli con la "brass cage", quelli con  "polyamide cage" sono principalmente utilizzati negli USA e su modelli Triumph/BSA.

Nota sui cuscinetti motore

I primi cuscinetti cosiddetti superblend, montati sui Combat ricostruiti furono gli R&M/RHP 6/MRJA30 (part Nr. 063906) di fabbricazione inglese. La Ransom & Marles che in seguito cambierà denominazione in RHP era allora fornitore di cuscinetti del gruppo Norton Villiers (il nuovo gruppo industriale Norton Villiers Triumph nacque nel 1973). In seguito arrivarono i FAG NJ306E (part Nr. 064118) che sono attualmente da considerare quale standard replacement part per le nostre Commando. Introdotti sul motore 850, i FAG divennero standard anche sul 750 (che condivideva molta della componentistica dell'850) a partire dal 1973. 

CAMBIO

Main shaft
nr. 1 cuscinetto RLS 5 2RS     5/8 X 1 9/16 X 7/16 Deep Groove Ball

Part Number:     
nr. 1 cuscinetto RLS 9 2RS     1 1/4 X 2 1/2 X 5/8 Deep Groove Ball

Part Number:     
(imperial bearing size) 

Lay shaft

consigliato come upgrade

nr. 1 cuscinetto NJ203     17 X 40 X 12 (disponibile con clereance C3) Cylindrical Roller Bearing

Part Number:     
di serie

nr. 1 cuscinetto 6203     17 X 40 X 12 Single Row Deep groove Ball
Part Number:     

FRIZIONE

nr. 1 cuscinetto 6007     62 X 35 X 14 Single Row Deep groove Ball

Part Number:     06-0750

Alcune note:

Il codice 2RS indica si tratti di un cuscinetto sigillato (sealed) cioè un cuscinetto con uno scudo di gomma su entrambi i lati , preconfezionato con grasso che sono da preferirsi perchè più durevoli rispetto ai tradizionali.

Basandosi sui codici la dimensione rimarrà costante ma la qualità può essere diversa. Affidatevi ai grandi brand come NSK, FAG, SKF, RHP che non tradiscono in termini di qualità la loro fama. Solo in alcuni casi può essere conveniente rivolgersi ai rivenditori di ricambi Norton, ad ogni modo confrontate sempre i prezzi.

NORTON SERVICE RELEASE NOTE

Norton Motors Service Release su Main Bearing

Service Release No. 68
Nature of Release	Revised main bearings
Models Affected	All years and models of Commando
Distribution	Worldwide
Explanation We are introducing a new roller main bearing arrangement in production almost immediately. The fitting of this bearing arrangement reduces overall width between the main bearings and increases timing side main bearing journal diameter. For service purposes we shall in future supply only the crankshaft of the latest size, Part No. 063106. The main bearings, Part No. 063114, must be used in conjunction. The new bearings are 2 dot single lip roller bearings and should be assembled with the lip into the crankcase in both cases. Main bearing Part No. 063114 is of the Ransomes type (R&M) MRJ A30. Alternative bearings which may be used are listed below:- Manufacturer Type S.K.F. NJ306 or NJ306E F.A.G. NJ306 N.T.N. NJ306 Hoffman R306L R.H.P. NF306 All bearings to be 2 dot or C2 Note in fitting that NJ type bearings have the rollers and cage assembled to the outer race so that the outer can be pressed into the crankcase either way around. The inner race must be pressed onto the crankshaft with the lip leading. The NF type bearings have the rollers and cage assembled to the inner race. The outer race must be pressed into the heated crankcase with the lip leading. The inner race complete with the cage and rollers can be pressed either way around onto the crankshaft. The later crankshaft of reduced overall width is identified by the letter 'R' stamped into the timing side crankshaft cheek adjacent to the bearing location. The designed crankshaft fitted end float for the new arrangement is 0.010" to 0.024" (0.254mm - 0.609mm). (October 1971)

Service Release No. N2/6
Nature of Release	Crankshaft main bearings
Models Affected	1972 Models commencing at Engine No. 200004
Distribution	Worldwide
Explanation Field experience with the 1972 models (incorporating two single lipped roller main bearings) indicates a small but significant premature roller main bearing failure rate. Reported failures have been confined solely to the one type of bearing. Action:- When replacing defective roller main bearings, ensure the replacement is a Skefco double lipped outer, single lipped inner spool type NJ306, with a specified nominal internal diameter clearance of 0.0008" - 0.0012" (0.02mm - 0.03mm) prior to fitting . Ensure the crankshaft journals are carefully cleaned up, removing all signs of butts or scoring before fitting the inner spool. Models subsequent to Engine No. 207197 incorporate a nominal increase in bearing housing diameter to overcome any significant tendency to excessive closure of the single lipped outer series of roller bearing. (July 1972)

Service Release No. N2/9
Nature of Release	Crankshaft main (roller) bearings
Models Affected	1972 Commando (all models)
Distribution	Worldwide
Explanation In order to extend main bearing life, a change of roller main bearing specification has now been authorized and fitted on production engines from Engine No. 211891. The new roller bearing is designated 'Superblend' with an increased load carrying capacity and is supplied under Part No. 063906 (manufacturers part number R&M 6/MRJA30). Action:- Where engine units are stripped for examination, or the need for main bearing replacement, fit only roller main bearings Part No. 063906 in place of the previously specified 063114. The new bearings are fully interchangeable, and should be fitted in pairs for maximum reliability. Note:- The new bearings may also be fitted to advantage to 1971 and earlier Commando machines, provided care is taken fitting the inner spool to the right side crankshaft journal (was 1.1807" - 1.1812") diameter, now 1.1812" - 1.1815" diameter. Also crankshaft fitted end float should be checked, and shimmed where necessary to provide 0.010" minimum, 0.020" maximum end float using shim Part No. NMT2196A as necessary. (August 1972)

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