Removing and installing pistons - RA03001043160X(03-3160)
WARNING: This page does not describe the selected car, but rather 42 other vehicles, including the 1999 Mercedes-Benz S600, 1999 Mercedes-Benz S500, 1999 Mercedes-Benz S420, 1999 Mercedes-Benz S320, and 1999 Mercedes-Benz CL600. However, it is still accessible from the selected car via links, so may be relevant.
Preceding work:
Engine removed (01-0300) .
Cylinder head removed (01-4150) .
Oil pump removed (18-2100) .
Oil shield removed (18-2180) .
Operation no. of operation texts and work units or standard texts and flat rates:
03-7061
REMOVING PISTONS
| Conrod bearing cap (1) | unbolt.
NOTE:
Conrod (2) and conrod bearing cap (1) are marked together.
|
| Conrod (2) with piston (4) | remove upward.
NOTE:
The direction of travel arrow is stamped at the top in the piston crown. On certain versions, the direction of travel arrow is no longer visible if the piston is worn; in this case, mark direction of travel on piston. |
TAKING OFF, FITTING ON PISTONS
| Piston pin circlip (5) | prise out with a screwdriver. Use clean cloth as base. |
| Conrod | repair, align (03-3130) . |
| Piston ring gap and top clearance | check (03-3170) . |
| Piston pin (6) and conrod bushes | oil. |
| Piston (4) and conrod (2) | install together.
NOTE:
The retaining slots (8) of the conrod bearings must face toward the left side of the engine. The raised face (4a) on one of the two piston pin bosses must face in the opposite direction of travel. |
| Piston pin (6) | press in by hand. |
| Piston pin circlip (5) | insert into groove (arrow). |
| Cleaned cylinder bores, conrod bearing journals, conrod bearing shells and piston (4) | oil. Install the conrod bearing shell with oil drilling into the conrod (2). |
INSTALLING PISTON
| Tensioning strap (7) 000 589 04 14 00 for piston rings | fit on, tension. |
| Piston (4) | install with arrow in direction of travel. |
| Conrod (2) and conrod bearing cap (1) | install with marking (arrow) facing each other. |
| Conrod bolts (3) | check, tighten (03-3100) . |
| Crankshaft | turn, check clearance. |
Special tools
NOTE:
Install new pistons with piston rings in used engines only if the cylinder bore does not have any abnormal wear, and is within the dimensional tolerances for cylinder shape and concentricity.
In the case of reconditioned engines, determine repair size (01-1100) , then order pistons on the basis of the valid parts documentation.
The honing should be visible and undamaged.
In the case of reconditioned engines, determine repair size (01-1100) , then order pistons on the basis of the valid parts documentation.
Pistons to prevent increased oil consumption
Production break-point :
104.980 10 007 303
104.980 12 033 749
104.981 10 001 753
104.981 12 015 196