A/T - Piston Removal/Installation Tool

REF. NO. MBNA 27/31, 58/84

TO: OUR MERCEDES-BENZ PASSENGER CAR DEALERS

DATE: August 1995

SUBJECT:
AUTOMATIC TRANSMISSIONS 722.3/4/5 FIXTURE FOR B-1 PISTON REMOVAL AND INSTALLATION





Special Tool

A new special tool has been developed for the removal and installation of automatic transmission piston B-1 with the transmission installed in the vehicle.

WORK INSTRUCTIONS FOR USE OF B-1 PISTON SPECIAL TOOL:





1. Remove transmission oil pan and gasket, oil filter, valve body and large intermediate plate, (Figure 1) (SMS Job Nos. 27-400 and 27-430).





2. Loosen closing cover of reaction valve B-1 (33) or overload protection switch S65 (33b) by approx. 3 - 4 turns (Figure 2).

Tightening torque: 70 Nm





3. Install special tool angled bracket to transmission housing using three 8 mm hex bolts (Figure 3).

Tightening torque: 13 Nm





4. Mount special tool compressing lever to angled bracket at side mounting eyelet that serves as pivot point (Figure 4).





5. Pull special tool compressing lever outward, in direction of lower arrow (Figure 5), to press in cover of piston B-1 allowing removal of circlip.





6. Carefully release compressing lever inward, in direction of lower arrow (Figure 6), to remove piston B-1 from transmission housing.

7. Reassemble in reverse order.

CAUTION!
During reassembly, always observe critical attention to correct installation position of B-1 piston return springs and alignment of B-1 piston pin into band 1 socket.

Note:
An administrative message will be issued in the near future regarding time allowance.