P/S - Revised Pressure Test

9224buick01

Bulletin 89-3-27

Date Nov. , '89

Ref. No. 89-257-3

Corp. Ref. No. 933001


SUBJECT:
SERVICE MANUAL UPDATE - POWER STEERING SYSTEM TEST PROCEDURES, SECTION 3 (REVISED INFORMATION)

MODELS AFFECTED:
1989 CENTURY


SERVICE MANUAL UPDATE


In the 1989 Century Service Manual page 3-12, step 7, 7b and 7c, have been updated to reflect a revised pressure reading specification.

(Step 7)

The second to last sentence should read: Each reading should show at least 8,619 kPa (1,250 psi) and not the printed specification 6,895 kPa (1,000 psi).

(Step 7b)

If the pressure readings are high enough, but are not within 345 kPa (50 psi) of each other, the flow control valve in the pump is sticking; clean it and remove any burrs using crocus cloth or fine hone. DO NOT DISASSEMBLE THE FLOW CONTROL VALVE. Flush the system if required.

(Step 7c)

If the pressure readings are less than 8,619 kPa (1,250 psi) replace the flow control valve and recheck. If the pressures are still low, replace the rotor and vanes.

Please update your manuals accordingly.