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Norton 850 Mk 1 1974 Скачать руководство пользователя страница 4

SERVICE NOTES ON THE NORTON COMMANDO

Covering all models up to and including Mk. IlI

Original Text: T. R. Stevens

Collation: AI Osborn

These service notes are based on the parts list and are intended to supplement it and the workshop manual. They
were written by Mr. T

.

R. Stevens for the club magazine Roadholder, and appeared in it from Sept/Oct '74 to May/

June '77, he group numbers referring to the groups in the parts list. When collating these notes I have taken the
opportunity to edit and update them where time and experience have dictated improvements. Further assistance from
T.R.S. and Mr L. Emery being used, while not inconsiderable extra notes have been added by our President Mr. J.
Hudson.

Mr T. R. Stevens was Quality Engineer and then Service Engineer at Norton Villiers Andover 1970-74, he is at
present lecturer in Motorcycle Engineering at Merton Technical College.

John Hudson worked with the Norton Development Shop from 23rd January 1955, initially as a fitter tester, finally
leaving the NVT complex in the summer of 1976 at its abolition. Voted as Life Honorary Member of the Club and
President for the second time in Sept 1970.

Les Emery, member of NOC since 1971, rose to National Committee in 1973 as Membership Secretary. He then
took charge of the spares scheme with regard to the twin cylinder machines.

Al Osborn joined the Club in 1970 rising to National Committee level as Assistant Editor in 1972, later becoming
Chairman from 1974-77.

SPARES SERVICE

Les Emery. 37 Albion Street. Rugeley. 5tatfs. Tel: (09984) 3974.

T.R.S, Test-rides a Fastback.

Diagram; by T.R.S. and Richard Graham (North London).
Front cover:- 1971 Fastback
Rear cover:- 1972 Fastback. now with Roadster upswept exhaust system.

The opinions contained (in these service notes are entirely -those of the authors. They have no endorsement from
any Norton factory, N.V.T., Norton Andover. or any such organization.

Notes in italics have been added for this edition by Alan Osborn, 9 Chapel Road, W. Ealing. London, W.13, from
whom further copies are available.

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Содержание 850 Mk 1 1974

Страница 1: ...COMMANDO SERVICE NOTES COMPLETE WITH ELECTRIC START Text Tim Stevens John Hudson Editor Alan Osborn...

Страница 2: ...One of the most popular the 750 Interstate 1973 with Combat engine signified by black barrels Photo credit Motor Cycle...

Страница 3: ...nels front mudguard scats rear mudguard tanks and instruments 32 Group 20 Exhaust systems 32 Groups 25 26 27 Electrics 32 Group 29 The tool kit 32 Addendum 33 Further model changes 33 Engine main bear...

Страница 4: ...Development Shop from 23rd January 1955 initially as a fitter tester finally leaving the NVT complex in the summer of 1976 at its abolition Voted as Life Honorary Member of the Club and President for...

Страница 5: ...by machining head double S camshaft fitted Black barrel 32mm carbs Disc brake right hand side behind fork leg Models now Fastback and Roadster 212 278 INTERSTATE Larger black or blue 5 gal tank seat l...

Страница 6: ...course the crank should be dismantled and all the sludge scraped out CRANKSHAFTS When having a crank reground specify in writing the size you want and the radius between the crank pins and the webs 0...

Страница 7: ...rable here as the nut is shallow and slightly recessed a ring will tend to slip The SS cam mentioned here is the Commando SS cam or double S as used in the Combat engine Interstate as opposed to the C...

Страница 8: ...icantly and new rings will restore your oil consumption If the bores are worn enough at this mileage it need boring then change your brand of oil or dare I say it change your oil Greater ring wear wil...

Страница 9: ...illa slice so you can hardly keep up with tightening the head bolts They also spread into the push rod holes and rub them away even if they don t rub them from new Copper and aluminum seem incapable o...

Страница 10: ...eaks valve springs is not having the right ones PUSHRODS Pushrod ends occasionally come loose but will run happily like this for a While but keep your eye on the rocker adjustment To retain loose push...

Страница 11: ...stud are both ruined Ask your local dealer it he stocks either You will note that the size of both nuts from the outside is 1in Whitworth to add to the confusion EXHAUST THREADS The exhaust threads i...

Страница 12: ...oks the same with the r counter on the side The proper Commando gasket is thick a bit thicker than the average cornflakes packet and they don t leak oil The paper ones are spurious or Dominator or Atl...

Страница 13: ...ame way that early rocker pipes failed We re coming to that The other reason that a pressure gauge isn t much good is really twofold At high speeds and high oil temperatures the pressure can drop to n...

Страница 14: ...s tends to cling onto the clutch plates causing drag After a good clean of the plates refilling with Castrolite or similar lightweight oil is preferred Worn exhaust port threads these are very often c...

Страница 15: ...troduced later to eliminate some of these faults and 1 would strongly advise any one still with the early type to change Use Nyloc nuts though not the all metal type used on production as you can choc...

Страница 16: ...to replace the rubbery hose pipe with plastic on 200 000 series motors I have seen a nylon reinforced pipe melted by the hot oil going up it The other oil differences on late 750s are the elimination...

Страница 17: ...gradual wear of the case The bearings sometimes rotate anyway this can be recognized by a polished not ground surface on the outside of the bearing when it is removed No real cure Loctite sometimes w...

Страница 18: ...ave an M an the side they are much more reliable If the pawl does break the side bits of the T shape wedge in the bottom gear pinion and the kickstart is carried down on its own and can then stay down...

Страница 19: ...vice releases have come to life Here and in other odd corners are the basic facts of importance HEAD GASKETS If there is any trouble keeping the copper one especially oiltight then a smear of Silicon...

Страница 20: ...dealers who could tell the same story but perhaps they haven t all got magnetic lintels What happens is this the engine as it rotates produces considerable torsional vibration not just due to the firi...

Страница 21: ...n is approached and as the plate goes through the flat position the load drops again for a bit and then rises again as the spring begins to become conical the other way If the dimensions are chosen to...

Страница 22: ...hose of you with scientific inclinations can look again at the diaphragm spring diagram to appreciate that a bit of wear on the plates actually increases the clamping load slightly whereas with coil s...

Страница 23: ...rder and needs the slide lowering a touch 4 When all is to your satisfaction switch off park the bike in a draught so it cools off and go and have a Castletown Ale 5 Now make sure that both slides ope...

Страница 24: ...dle The head steady supports the engine when the back wheel is twisted either way when cornering for instance Please all of you fit the later box section 850 head steady it does not break and it resis...

Страница 25: ...S type made for the Americans and one of the faster early models 1970 Note the lack of cush drive rear hub bolt up as Dommie and the T L S front brake Both exhaust pipes up the left side made a beauti...

Страница 26: ...st benefit you also need the 850 yokes but the 750 type will fit and give the desirable increased trail It may be appropriate to say a few words about high speed weaves 1 The worst machines arc 750s f...

Страница 27: ...t fits the centre tube properly you can hold it in place more firmly using a good strong pair of car exhaust clamps the type which are made of a thick U bolt and a steel pressing Fit these round the t...

Страница 28: ...her Then periodical oiling with a Wesco is all that is necessary 1 know NVT say SAE140 or EP90 but I use engine oil if nothing else available any is better than none at all Finally referring once agai...

Страница 29: ...wed in and broke off just below the surface The thread is 7 16in x 20 UNF but it is best to drill out the thread in the hanger completely so that in the event of a breakage you can fit the new bit at...

Страница 30: ...is interchangeable with elements from Citroen 2CV cars and Simca 1100s the Simca unit is a bit longer than the Citroen job but the thread and so on are identical Fancy a Commando having metric thread...

Страница 31: ...he load on two or three halls c The wet gets in causing rust and fretting corrosion For once then they got it right bearings which can t be fitted too loose or tight and which are sealed on both sides...

Страница 32: ...scoop removed and welded over success Now the linings you can benefit from by fitting are AM4 green racing but they have to he fitted by on expert and machined exactly to the drum site Also make sure...

Страница 33: ...stuck This can even happen if the throttle just sticks especially if the single cable freezes in the outer so it s best to tape the ferrule to the end of the cable This also helps to stop the rain ge...

Страница 34: ...connected at either end They go from the headlamp to just behind the head steady and are colored purple and green brown and black and brown and purple If you need a spare bit of wire at the roadside...

Страница 35: ...ring 147730 Rear brake drums screwed and riveted 147846 Toughened kickstart pawl 148895 Modified inlet valve guide for oil seals 149670 Oil seat fitted to inlet guide 150120 Oil pump paper gasket fitt...

Страница 36: ...available from Gus Kuhn This can also be caused by keeping oil level up to maximum level the oil is then sucked through the air filters and cokes valve stems up causing exhaust valves especially to st...

Страница 37: ...fit both models but the 3 phase will need a different rectifier and a new pair of matched Zener diodes fitted Full details from Al Osborn or Les Emery J H Alternator on Mark lll the rotor stator clear...

Страница 38: ...ble to lower the gearing to 21T or even a 20T gearbox sprocket see page If fur further details If old ball hearing is worn or has collapsed you must replace layshaft hush in kickstart Sometime in its...

Страница 39: ...ntre of its operating arm This only has to be a fraction out for a poor gear change either up or down to result To check you have got it right replace gearbox cover and lever Put machine on its centre...

Страница 40: ...dismantling the rear master cylinder and unscrewing the two body halves which have a right hand thread there is a locking alien grub screw below the surface of the body lost in the muck to be removed...

Страница 41: ...cam lobe clearance at the crankcase oil fling shroud In addition problems can arise due to valve head diameter valve stem and spring length discrepancies particularly where an early non Combat cylinde...

Страница 42: ...0x19 on front riot 4 10x19 REAR SUSPENSION UNITS If you have gut a good handling hike and never carry a passenger then use 100 lb springs on the hardest setting absolutely essential Girling gas shocks...

Страница 43: ...n page I and yet for one slide to lag behind the other 3 Close throttle and ensure that both slides lift off their stops at exactly the same time Adjust using the throttle stop screws Ensure that ther...

Страница 44: ...rrect even if the carburetion is a bit out Other symptoms to look for 1 Good acceleration in a particular hand but rough cruising which clears the instant the throttle is opened Richness finally leads...

Страница 45: ...de base oil not clever stuff Not at 110 at 110 anyway and mph that is Also as the multigrade is based for cars with a lower BHP litre ratios and water cooled motor the temperatures are reasonable with...

Страница 46: ...Keep polishing 44...

Страница 47: ...The Roadster again fitted with Combat motor Interesting to compare this with the type of 1970 Page 23 Photo credit Motor Cycle 45...

Страница 48: ...Published by the Norton Owners Club and printed by Brazier Naish Ltd 202 204 High Road Benflect Essex SS7 5LD...

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