A/T - 2nd to 3rd Gear Splippage or Flare Up
90mazda06 Category KApplicable Model/s 1988-90 626/MX-6 incl. Turbo
Subject EC-AT SLIPPAGE IN FORWARD GEARS
Bulletin No. 005/90
Issued 5/14/90
Revised
DESCRIPTION
If you encounter a complaint about 2-3 gear slippage or flare-up, it may be caused by improper function of the oil pump. Please check and repair this problem according to the procedure described in this bulletin. At the mass-production line, the oil pump has been modified since the date indicated under VIN of Production Change.
CHECKING & REPAIR PROCEDURES
1. Warm up the engine to normal operating temperature.
2. Check the line pressure in "P" range at idle. Adjust it if necessary.
Specification: 4.4-4.6 kg/sq. cm. (63-66 psi)
3. Perform the following tests while the engine speed is kept at 2,000 rpm in "Park."
A. Pull the throttle cable to the end of its travel (full throttle) and read the line pressure. Line pressure should be higher than 8.0 kg/sq. cm. (115 psi).
B. Next, quickly and smoothly pull the throttle cable out to one-half way of its travel (half throttle) and hold. Check for line pressure spike (maximum) and drop (minimum) readings using a line pressure gauge.
^ A good oil pump should show a smooth increase of pressure and level off at a stable pressure.
^ If the spool valve of the oil pump is stuck, it may cause a pressure spike and variation in pressure before leveling off, or it may show little/no increase in pressure. (Refer to the illustrations.)
4. If a problem is found in Step 3, replace the oil pump spool valve according to the Replacement Procedure.
5. Recheck the line pressure according to Step 2 and perform the road test to confirm that the problem is fixed.
SPOOL VALVE REPLACEMENT PROCEDURE
1. Lift up the vehicle on a hoist.
2. Remove the spool valve plug using 19 mm swivel socket and a 6 in. extension.
3. Remove the spring and spool valve with a small pencil magnet.
4. Insert the new spool valve into the oil pump with the partially closed end pointing outward.
5. Insert the spring until it becomes flush with the oil pump housing.
6. Replace the copper washer on the spool valve plug and reinstall the plug onto the oil pump housing. Tighten the plug by the specified torque.
Specified Torque: 2.4-3.6 m-kg (17-25 ft. lbs.)
7. Check the ATF level, and add fluid if necessary.
8. Recheck the line pressure and adjust if necessary.
Specification: 4.4-4.6 kg/cm(2) (63-66 psi)
PARTS INFORMATION
PART NUMBER DESCRIPTION
FU02 19 735F Oil Pump Spool
FU02 19 738A Copper Washer
VIN OF PRODUCTION CHANGE
1990 626/MX-6 vehicles manufactured in the U.S.A.:
WARRANTY INFORMATION
Warranty Type Code: A
Customer Comment Code: 99
Damage Code: 99
Part No. of Main Cause: FU02 19 735F
Operation No: XX0379-R-1 - Max. 0.8 Hr. (Check & Adjustment)
XX0379-R-2 - Max. 1.0 Hr. (Check, Adjustment & Repair)
NOTE: Labor operation no. XX0379-R-1 is included in labor operation no. XX0379-R-2.