Disassembling Pistons
WARNING: This page is about a different variant/trim than selected.
CAUTION:
Risk of engine damage if piston rings are overstretched!
- → Do not overstretch piston rings with the piston ring pliers. Only open up the piston rings until they just fit over the piston.
Information
- If re-using the piston, do not remove combustion residues on the piston crown mechanically.
Piston, connecting rod
| 1 | Piston-ring set; oil with engine oil; TOP marking facing upwards; oil scraper ring down; ring gaps offset by 120° |
| 2 | Piston; different on naturally aspirated and turbo engines; combustion chamber recess facing centre of engine; left and right different; direction of travel arrow in direction of travel |
| 3 | Piston-pin circlip (positioned at 6 o'clock or 11 o'clock) |
| 4 | Piston pin; oil |
| 5 | Connecting rod |
| 6 | Connecting rod bolt; replace as it must be tightened in the plastic area; oil screw |
| 7 | Connecting rod bearing shells; oil with engine oil |
Connecting-rod assembly, bearing shells
| A | View A (identification area for connecting-rod number; fit connecting rod with identification area facing exhaust side; markings on rod and cap must be on the same side) |
| B | View B (fit bearing shells flush and press in by hand) |
| C | View C (fit bearing shells flush and press in by hand) |
Piston classification, naturally aspirated engine
| 1 | Marking for dimension group (just one permitted per engine, in this case x) |
| 2 | Porsche short numeric code without main or middle number |
| 3 | Short numeric code (supplier) |
| 4 | Marking area for weight group (just one permitted per engine, + or -) |
| 5 | Cylinder bank identification (V6 1-3 and 4-6) (V8 1-4 and 5-8) |
| 6 | Barcode 128 (short numeric code without main group or weight group) |
| 7 | Arrow marking in direction of travel |
| 8 | Identification for dimension group |
| 9 | Arrow marking in direction of travel |
| 10 | Inspection stamp (supplier) |
Piston classification, turbo engine
| 1 | Arrow marking in direction of travel |
| 2 | Porsche short numeric code without main or middle number |
| 3 | Short numeric code (supplier) |
| 4 | Cylinder bank identification (V8 1-4 and 5-8) |
| 5 | Marking area for weight group (just one permitted per engine, + or -) |
| 6 | Barcode 128 (short numeric code without main group or weight group) |
| 7 | Arrow marking in direction of travel |
| 8 | Marking for dimension group (just one permitted per engine, in this case x) |
| 9 | Marking area for weight group (just one permitted per engine, + or -) |
| 10 | Inspection stamp (supplier) |
Information
- When disassembling the piston/connecting rod unit, note or mark the position, relationship to cylinder and installation position using a waterproof felt tip pen.
- Secure piston on > 9597 - retaining device (> Piston on retaining device
).
Piston on retaining device
- Remove both piston-pin circlips using a small screwdriver. To do this, guide the screwdriver through the small cut-out and carefully lever out the piston-pin circlip > Levering out piston-pin circlips with a small screwdriver
.
Levering out piston-pin circlips with a small screwdriver
- Insert piston into the > 9597 - retaining device (leave space below for the piston pins) and drive out piston pins using a suitable pressure piece. > Piston pin with plunger
Piston pin with plunger
- Remove connecting rod from the piston and place to one side.
Information
- Compression rings and oil scraper rings are installed and removed differently.
- Remove piston rings.
- 5.1 Place the piston on a clean surface and look for the gaps in the piston rings.
- 5.2 Remove the piston rings, starting at the piston crown. To do this, move the middle point of > Nr.58 - piston ring pliers Gr. 1 into the gap in the relevant ring. The holding arms of the piston ring pliers should clasp the piston ring from above > Piston ring pliers on piston ring
. Only open the piston ring as much as is needed to remove the piston ring from the groove. Do not overstretch it!
Piston ring pliers on piston ring
- 5.3 Relieve the piston ring pliers and remove the piston ring from the pliers.
- 5.4 Remove the two-piece oil scraper ring as follows: First, remove the outer ring by hand by carefully prising it away from the piston. Then remove the inner oil scraper spring in the same way.