Starting cafe racer restoration Commando 850 MK3 from Spain
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cliffa
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For some reason RGM sent me a braded hose with a flange type union on the end instead of the taper seat type. I was pretty surprised they would do that, as like you mentioned the surface is not machined and normally has the casting joint running right across it. I was under time pressure to take the bike for it's MFK (MOT) test so I elected to use it. I put a foam earplug in the hole and carefully filed the surface flat, then used a copper washer to seal it. By the time I got to the testing centre the bloody thing has wept enough for the tester to see and failed it.
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- Nov 20, 2004
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Like this? What fitting did it have at the other end?
FRONT STAINLESS BRAIDED BRAKE HOSE COMPLETE WITH STAINLESS FITTINGS
FRONT RGM NORTON STAINLESS BRAIDED BRAKE HOSE
www.rgmnorton.co.uk
Did you specify a master cylinder to caliper hose or master cylinder to bracket (and Bundy pipe) because the short fitting in RGM's picture would normally be attached to the master cylinder (that is machined flat) with a copper washer and the longer (bulkhead) fitting at the lower end attached to the bracket/Bundy pipe?
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Good to know RGM can supply a tailored made stainless steel hose. I will order it to them.
I keep progressing, I dismounted and cleaned the rear brake master cylinder that was in very bad condition, probably stocked along many years full of brake fluid that became a sort of paste now. I cleaned every part using WD40 lubrication oil first to remove the dirt and then my plan for the next days is to introduce small metal nuts into the cylinders add vinagger and shake to get a good clean. Finally I will blow air from a compressor.
These are the parts I disasembled and now I need to order a kit of every rubber part.
I keep progressing, I dismounted and cleaned the rear brake master cylinder that was in very bad condition, probably stocked along many years full of brake fluid that became a sort of paste now. I cleaned every part using WD40 lubrication oil first to remove the dirt and then my plan for the next days is to introduce small metal nuts into the cylinders add vinagger and shake to get a good clean. Finally I will blow air from a compressor.
These are the parts I disasembled and now I need to order a kit of every rubber part.
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- Nov 20, 2004
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The rubber boot in the first picture is not the correct item for the Mk3 rear master cylinder.
It should be:
The operating rod limit nut (with the groove and facing the wrong direction in your picture) should be set to the dimension below (and locked with the thin nut).
Note that the flat metal washer and thinner rubber piston seal with the smaller hole included in the rebuild kit are not used.
It looks like there could be a circlip instead of the standard safety fastener on the clevis pin.
(The safety fastener 06.5782 is drawn as a split pin on the parts diagram but that is not correct)
It should be:
Motorcycle parts and spares for Norton motorbikes - Genuine Andover Norton Spare Parts - Andover Norton Motorcycles Parts - Original Andover Norton Parts
Motorcycle parts and spares for Andover Norton motorbikes: Andover Norton manufactures and supplies all Genuine Factory Spare Parts for Norton motorcycles built before 2002.
andover-norton.co.uk
The operating rod limit nut (with the groove and facing the wrong direction in your picture) should be set to the dimension below (and locked with the thin nut).
Note that the flat metal washer and thinner rubber piston seal with the smaller hole included in the rebuild kit are not used.
Motorcycle parts and spares for Norton motorbikes - Genuine Andover Norton Spare Parts - Andover Norton Motorcycles Parts - Original Andover Norton Parts
Motorcycle parts and spares for Andover Norton motorbikes: Andover Norton manufactures and supplies all Genuine Factory Spare Parts for Norton motorcycles built before 2002.
andover-norton.co.uk
It looks like there could be a circlip instead of the standard safety fastener on the clevis pin.
Motorcycle parts and spares for Norton motorbikes - Genuine Andover Norton Spare Parts - Andover Norton Motorcycles Parts - Original Andover Norton Parts
Motorcycle parts and spares for Andover Norton motorbikes: Andover Norton manufactures and supplies all Genuine Factory Spare Parts for Norton motorcycles built before 2002.
andover-norton.co.uk
Last edited:
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I think K Tech also do new style fork internals for Commando.
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- Oct 20, 2022
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I understand that the flat metal washer include in the rebuild kit is not necessary but looking at Norton diagram it looks to me that the thinner rubber piston seal with the smaller hole is needed to be inserted between the white nylon part over the spring and the metal piston, don`t you think so?The rubber boot in the first picture is not the correct item for the Mk3 rear master cylinder.
It should be:
Motorcycle parts and spares for Norton motorbikes - Genuine Andover Norton Spare Parts - Andover Norton Motorcycles Parts - Original Andover Norton Parts
Motorcycle parts and spares for Andover Norton motorbikes: Andover Norton manufactures and supplies all Genuine Factory Spare Parts for Norton motorcycles built before 2002.andover-norton.co.uk
The operating rod limit nut (with the groove and facing the wrong direction in your picture) should be set to the dimension below (and locked with the thin nut).
Note that the flat metal washer and thinner rubber piston seal with the smaller hole included in the rebuild kit are not used.
Motorcycle parts and spares for Norton motorbikes - Genuine Andover Norton Spare Parts - Andover Norton Motorcycles Parts - Original Andover Norton Parts
Motorcycle parts and spares for Andover Norton motorbikes: Andover Norton manufactures and supplies all Genuine Factory Spare Parts for Norton motorcycles built before 2002.andover-norton.co.uk
It looks like there could be a circlip instead of the standard safety fastener on the clevis pin.
(The safety fastener 06.5782 is drawn as a split pin on the parts diagram but that is not correct)Motorcycle parts and spares for Norton motorbikes - Genuine Andover Norton Spare Parts - Andover Norton Motorcycles Parts - Original Andover Norton Parts
Motorcycle parts and spares for Andover Norton motorbikes: Andover Norton manufactures and supplies all Genuine Factory Spare Parts for Norton motorcycles built before 2002.andover-norton.co.uk
And I do not quite understand from which parts diagram comes the safety fastener 06.5782 which also think is useless.
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- Nov 20, 2004
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No, absolutely not. The cupped seal fits adjacent to the white spring part.
Here are the parts in the correct order:
That piston seal and flat metal washer are intended for use with a different piston assembly not used on the Mk3 or any other Commando.
Item 25, (drawn incorrectly) retains the clevis pin 23 which would otherwise work its way out without a retainer.
Andover Norton Parts Drawings - Genuine Andover Norton Factory Parts - Commando Parts
Andover Norton Parts are the only Norton spare parts in the market manufactured to original drawings, within the factory-approved tolerances, from the correct materials, and with the correct finish.
andover-norton.co.uk
Also, note that the clevis pin retains the short leg of the pedal return spring. The clip, therefore, goes on the inside of the clevis
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- Nov 20, 2004
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Also, it is important to screw the barrel assembly into the housing by a set number of turns.
The correct procedure can be found here:
And fold the diaphragm as shown:
The correct procedure can be found here:
And fold the diaphragm as shown:
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- Oct 20, 2022
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Ok understood! But the rubber seal with the small hole is not the one I need to insert on the metal piston?
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- Oct 20, 2022
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Ok understood! But the rubber seal with the small hole is not the one I need to insert on the metal piston?
View attachment 102961
View attachment 102963
View attachment 102961
View attachment 102963
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No, it's the seal with the larger hole (above it in the picture) that fits onto the outer end of the piston which should become clear after you remove the old one.
Larry S
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I rebuilt my rear master cylinder, installed it and never could get it to work properly. Ended up buying a new one and have had no problems since. I also tried to use the original bundy pipes but could never get them to seal properly. Ended up getting new bundy pipes also. I was able to rebuild both calipers. Everything else was replaced with new. The good news is that it stops well and doesn’t leak. Good luck.
grandpaul
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You may have had a slightly scored or irregular bore that can NEVER seal properly.
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- Nov 20, 2004
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Yes, the master cylinder (barrel) is often too corroded and scored at the outer end to reuse safely even after some cleaning up.
Personally, I prefer to replace all original barrels or barrel assemblies with stainless steel.
https://montysclassicmotorcyclessho...nless-tr7-t140-t150-t160-norton-mk3-874-p.asp
TRIUMPH STAINLESS MASTER CYLINDER ASSEMBLY 99-9918S T140 T150 T160 NORTON MK 3
TRIUMPH STAINLESS MASTER CYLINDER FRONT OR REAR TR7 T140 T150 T160 NORTON MK 3 REAR Complete with stainless piston spring and seals ready
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I am planning to install an oil pressure gauge to avoid troubles.
I would like to buy this https://www.feked.com/oil-pressure-...-3-8-tapered-26-tpi-thread-liquid-filled.html
It seems includes a 3/8" thread screw, can you tell me which connectors, kind of oil line and oil screw I need to buy to install it?
Are the oil line and connectors the same as the ones normally used as brake line?
I would like to buy this https://www.feked.com/oil-pressure-...-3-8-tapered-26-tpi-thread-liquid-filled.html
It seems includes a 3/8" thread screw, can you tell me which connectors, kind of oil line and oil screw I need to buy to install it?
Are the oil line and connectors the same as the ones normally used as brake line?
Fast Eddie
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Ready to fit kits, with everything you need, are available from hNw and others.
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- Nov 20, 2004
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If "tapered" then it cannot be 3/8" UNF thread.It seems includes a 3/8" thread screw,...
Engine & Transmission :: Engine Lower :: Oil Pressure Valves :: Oil Pressure Gauge - 1+3/4" Diameter With 3/8" Tapered 26 TPI Thread - Liquid Filled
Oil Pressure Gauge - 1+3/4" Diameter With 3/8" Tapered 26 TPI Thread - Liquid Filled. Universal fit as required. Polished stainless steel bezel, chrome plated housing and black face. 0-100 PSI. Standard straight - 45° and 1/2" adapter available.www.feked.com
Are the oil line and connectors the same as the ones normally used as brake line?
"Standard 3/8" tapered 26 TPI fitting." isn't anything "Standard" and it's probably 1/8" x 27 TPI, NPT, (tapered pipe*) thread.
*(Pipe threads are described by pipe bore size, not thread diameter)
"45° adaptor: 3/8" inlet and outlet."
Presumably 1/8" x 1/8" NPT?
"Straight adaptor: 3/8" inlet and 1/2" outlet."
?
V-Factor 88015 Chrome with Black Face 60lb Oil Pressure Gauge 1/8-27npt 1 1/2" o.d Stainless Steel Bezel Weather Resistant Seal Lens
V-Factor 88015 Chrome with Black Face 60lb Oil Pressure Gauge 1/8-27npt 1 1/2" o.d Stainless Steel Bezel Weather Resistant Seal Lens - V-Factor
www.easyr.com.au
Fast Eddie
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As LAB has pointed out there quite succinctly … this ain’t no modern metric machine !
You gotta weigh it up… chances and cost of screwing it up vs cost of an off the shelf complete kit.
Yer pays yer money and makes yer choice…
You gotta weigh it up… chances and cost of screwing it up vs cost of an off the shelf complete kit.
Yer pays yer money and makes yer choice…
