Hello All,
What air pressure should the front and rear tyres of my RML be, please?

My bus number (if any): RML 2672

Hi Alan

I put 95psi in fronts and 90psi in the rears.

David

My bus number (if any): RM548, RM765 and RM1783

It depends on the type of wheel, type of tyre and use. If you run the bus light, you can drop the pressure a little to reduce bounce and increase road adhesion.

If you use it for it's purpose, then the pressures should be as spec for the wheel and tyre type.

LT normal standard for RM`s was 110 front and 70 rear.
Don`t know about RML spec.

LT spec may not be right, depends as some said on the type of tyres, cross-ply, radial, or tubeless!

My bus number (if any): RML2532

I have a couple of sheets of info that I have compiled for Routemasters that I use.
If anyone spots any errors I would be pleased to know.




Routemaster Restoration Ltd

USEFUL ROUTEMASTER INFO

Design requirement for the RM was 17 years!!!

Tyre Pressures (radial)
RM/RNC/RCL 104psi Front 70psi Rear
BEA 104psi Front 100psi Rear

Wheel Nut torque settings 400/450ft lbs.
Wheel Nut socket size

Cylinder Head 90ft lbs

Diff casing bolts 65ft lbs

Should get a minimum of 9 applications of the brake pedal before the flag falls.

Front springs, 2 standards.
One with the end coils painted brown, the other has the end coils painted yellow. Do not mix them on a boat.
When fitting a spring always have the end of the coil pointing towards the centre of the vehicle at the upper end.

Brake Check

With neutral selected start engine and run at idling speed, check that
Flag rises and white light goes out within
1 min. 40 sec (Lockheed)
3 min. 20 sec (Clayton)
Cut out pressure is reached within
2 min. 30 sec (Lockheed)
4 min. 30 sec (Clayton)

Red Light out within 4 min 30 sec

Unloader valve operates within 8 min. 30 sec.

Accumulators should be charged to 500-550 psi max


Brake Drums, shoes and skimming.

STD drum size 395.5mm dia
1st Skim 396.5 - 400.5mm dia
2nd Skim 400.5 – 403.0mm dia

Three sizes of rollers depending on drum diameter
STD drum size 11/2” dia
1st Skim 13/4” dia
2nd Skim 2” dia

AEC Tappet Adjustment
10 – 12 thou hot

1 - 6
2 - 5
3 - 4

So, if on No. 1 cylinder, the valves are on the rock, ie. inlet just closing and exhaust just opening, then
Adjust both valves on No. 6, and so on

Rear Wheel Brg. End Float
6 – 10 thou only

There are 10 steering linkage joints to grease.

STD Diff 5.2:1 ratio DU17
RMC/RCL 4.77:1 ratio DU18
BEA Diff 4.08:1 ratio DU24

RM/RML Gearbox GB32
RMC/RCL/ Gearbox GB39

RM Engine AV590 1800 rpm
RMC/RCL Engine AV590 2000 rpm
BEA Engine AV690 2200 rpm

Capacities
Engine Oil (AEC) 4 ¾ Gals (22ltrs) Morris Golden Film SAE30
Flywheel 3 ½ Gals (16ltrs) Morris Golden Film SAE30
Depending what’s already in there.
Gearbox 2 ½ Gals (11.4ltrs) Morris Multitrans BC
Gearbox 2 ½ Gals (11.4ltrs) Morris Liquimatic DII
Gearbox 2 ½ Gals (11.4ltrs) Morris Golden Film SAE30
Diff 2 ½ Gals (11.4ltrs) Morris Golden Film AG90
Brake Oil 3 ¼ Gal (15ltrs) Morris Liquimatic No2
Power Steering 6 pints (3.4ltrs) Morris Liquimatic No2
Steering Box 6 pints (3.4ltrs) Morris Golden Film AG140
Compressor .4ltr Morris Golden Film SAE30
Fuel Pump(cam box & governor) Morris Golden Film SAE10
Grease Points Morris 42EP Lithium multi purpose grease

Fuel Tank 29 Gals (130ltrs)
Cooling System 25%-50% antifreeze 8 Gals (36ltrs)

Rear hub(if Bellows fitted) 1 ¼ pints (0.7ltrs) Morris
The plug in the hub at 4 o clock position
Or
Rear Hub(if lip type oils seal) Morris 42EP Lithium multi
purpose grease


I hope its of use.

Cheers

Rob

My bus number (if any): RM13

Brilliant Rob - very helpful - thanks (wheel nut socket size 5/8th Whitworth or 28mm)

My bus number (if any): RML2747

Sounds very useful; I'd suggest using an ATF or ATX in the flywheel and gearbox rather than the original spec SAE30 as this is far better suited for the application.

I got that info from Tony Lewis at Cobham Museum as he used to work in oil technology research and told me years ago that he was involved in the development of psv oils especially those for auto transmissions. The ATF/ATX has a much higher flashpoint than SAE30.

My bus number (if any): RML2532

Thanks for all the info. Very interesting!
Regards
Alan Pell

My bus number (if any): RML 2672