JAGUAR SERVICE - Terry's Jag

JAGUAR

SERVICE BULLETIN

Number Section

Sheet Date

L.1 Brakes

1 (of' 2)

January, 1960

DISC mAKE MASTER CYLINDER RIDONDITIONING

Models affected

All cars f'itted with disc brakes

A new type of master cylinder is now fitted to cars with

disc brakes and the assembly of internal parts, supplied as a re-

con:litioning kit (Part number 8250), can be incorporated in the

existing body of earlier type master cylinders when reconditioning master cylinders of that type. Individual parts are not supplied

separately.

The new type of master cylinder was introduced at the

following chassis numbers:

2.4 litre Mark 2

3.4 litre Mark 2 3. 8 litre Mark 2

Mark lX

XK.150 Open 2 seater

Drop Head Coupe Fixed Head Coupe

R.H. Drive

100473 150346

200092

773392

820066

827506 825127

L.H. Drive

125120

175141+ 210676 792257

832114 838590

836635

When reoonditioning a brake master cylinder of the type shown in Fig.1. attached, the following procedure should be adopted.

(1) Remove the dust excluder from the head of the master cylinder.

(2) Remove the circlip (using circlip type pliers if available, alternatively, round nose pliers ms:y be used). This will release the push rod oomplete with dished washer.

(3) Withdraw the piston and valve assembly complete with springs

and supports.

Discard the piston and valve assembly (items 3, 5, 6, 7, a, 9,

10 and 11 on Fig.1 ) and the circlip ( 12) ?

/Continued

Jaguar Cars Limited 2005

(5) Wash cylinder, push rod, rubber dust excluder in metcylated spirit

or clean brake fiuid. Check that cylinder bore is in good oondition and that dust excluder and dished washer are undamaged.

(6) As the piston and valve assembly are not anchored together, ensure

during fitting that the piston end of the valve stem locates in the piston bore. (See Fig.2.)

( 7) Lubricate the cylinder bore with brake fluid; insert the piston and. valve assenbly until the piston fitting sleeve engages in the mouth of the cylinder. Push the piston fixmly through the fitting

sleeve and remove the sleeve when the piston assembly is :fully home in the cylinder bore.

Note:

A special lubricant is packed between pi ston seals, therefore it is important that f'i.tting sleeve is not removed until piston is correctly looa.ted in cylinder.

(8) Ebsition the push rod and depress the piston suf'fioiently to allow the dished washer to seat on the shoulder at the head of the cylinder. Fit the new circlip and oheok that it f'ully engages

the gt"'ove.

(9) Fill the dust excluder with clean Wakefield Ru.bber Grease H. 95/59~

(Tube in kit).

(10) Reseat the dust excluder around the head of the master qylinder.

(11) Remove the existing identification t ab and fit new tab supplied.

Note:

During the whole of the servicing operation use only clean

brake fluid, Wakefield Crimson, to SAE. 70R1 ? After refitting the master cylinder to the car and bleeding the system, make

a careful cheCk of all units, pipes and fittings for leaks.

The part rwmbers of' the new type master cylinders are as follows:

2.~ litre, 3.4 litre, 3.8 litre Mark 2

XK.150

Mark l.X

C. 16469

0.16~70

0.16471

The identification tab f'itted to these types of master cylinders and the tab included in the reoonditioning leit 8250 have a widened

portion as indicated by the arrow in Fig.3.

/Cont'd???

Jaguar Cars Limited 2005

Service Bulletin L.1 continued

Sheet 2 (of' 2)

FIG I.

VALVE

!>PRING

FIG 2.

~

/

FIG 3

~

~

Jaguar Cars Limited 2005

JAGUAR

SERVICE BULLETIN

Number Section

Sheet Date

L.3 Brakes

1 (of' 1) March, 1 960

HANDBRAKE CONNIDTmG LINK

Models af'fected

XK.1 50 - Drop Head Coupe

- Fixed Head Coupe

Commencing Chassis numbers

R.H. Drive L.H. Drive

827510

836724

On cars with the above chassis munbers and onwards a longer hanibrake oonnecting link is fitted to improve the efficiency of the hand.brake. The connecting link has two holes at its lower end: a:nd for maximum efficiency the pin securing the link to the handbrake crossshaft lever IIB.lst be inserted in the lower hole.

The nfNI connecting link (Part number 0.16866) may be used to replace the previous link (Part munber C.8316) on cars prior to the

above chassis numbers.

' VACUUM CYLINDER LUBRICANT

Models affected Cars fitted. with a lockheed servo

The vacuum cylinder oil "Cosmolubic 1OO" reoomnended. for lubrication of the vacuum cylinder (see pages L.38 and L.4.2 of' the 2.4/3.4-

litre Service Manual) has now been superseded by "Shell Tellus 33".

"Shell Tellus 33" is available in eight ounce plastic bottles.

Jaguar Cars Limited 2005

jAGUAR

SERVICE BULLETIN

Number L.8 Section Brakes

Sheet l (of 1) Date June, 1961

INTRODUCTION OF CAST IRON BRAKE CYLINDERS

Models affected

2.4 litre ?ark 2 with disc wheels 2.4 litre Mark 2 with wire wheels 3.4 litre Wark 2 with disc wheels 3.4 litre Mark 2 with wire wheels 3.8 litre llark 2 with disc wheels 3.8 litre llark 2 with wire wheels

Commencing Chassis Numbers

R.H. Drive L.H. Drive

106897 106839 154315 154321 203627 203576

126283 126295 176964 176938 216474 216374

On cars with the above chassis numbers and onwards cast iron brake cylinder blocks replace malleable iron.

With this change the self adjustment arrangement is modified. The spring washer, shown in Fig.2, Section L of the Mark 2 Service Manual is no longer used, the retract ion being by a coil spring located in the piston.

Also, whereas the original type had a separate piston and backing plate (see Fig.l4, Section L of the llark 2 Service Manual) the new type is of integral construction with no end plate.

It is therefore necessary when removing or replacing the piston seal or dust seal to stretch the rubber over the end of the piston. When replacing the piston seal it should be well lubricated with brake fluid and great care taken not to scratch or damage the inside surface of the seal or the groove in the piston.

PRECAUTIONS TO BE OBSERVED WHEN RETURNING llA.STER

CYLINDERS AND SERVO UNITS

(All Models)

When returning master cylinder and servo units to the factory, distributors and dealers are requested to plug the hydraulic connections to prevent the possible ingress of mineral oil which may give a misleading iapression of the condition of the rubber seals.

Usually, it will be possible to use the plastic blanks provided in the replacement master cylinder or servoJaugunariCta.rs Limited 2005

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