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.

Fig 1: Piston, Connecting Rod Components Location

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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

Fig 2: Connecting-Rod Assembly, Bearing Shells Components Location

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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)

Fig 3: Piston Classification, Naturally Aspirated Engine Components Location

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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 5-31
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)

Fig 4: Piston Classification, Turbo Engine Components Location

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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).

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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.

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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

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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.
Place the piston on a clean surface and look for the gaps in the piston rings

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!

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Piston ring pliers on piston ring

Relieve the piston ring pliers and remove the piston ring from the pliers.

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.