Assembling Pistons

WARNING: This page is about a different variant/trim than selected.

CAUTION: Engine damage due to improper handling of piston rings!

Engine damage and strain, damage to piston rings
1. → Do not overstretch piston rings with the piston ring pliers. Only open up the piston rings until they just fit over the piston.
2. → Do not use force to install pistons.

Information

If re-using a piston, do not remove combustion residues on the piston crown mechanically.

Clean the piston.
Information
- Compression rings and oil scraper rings are installed and removed differently.
Install oil scraper ring.

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Oil scraper ring
1. 2.1 Insert spring into the groove on the piston so that the gaps are touching. Oil scraper ring Make sure that the gaps do not overlap. Oil scraper ring
2. 2.2 Carefully spread the upper and lower discs using piston ring pliers and push onto the piston.
Allocate and install compression rings.

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Allocation of piston rings
1. 3.1 Identify lower compression ring -2- according to allocation, pick it up using piston ring pliers and position it in the groove on the piston.
2. 3.2 Identify upper compression ring -1- according to allocation, pick it up using piston ring pliers and position it in the groove on the piston.
3. 3.3 Position gaps between compression rings -1 and 2- and oil scraper ring offset -3- by 120°.
4. 3.4 Check that the piston rings -1 to 3- are fitted correctly and are assigned correctly.
Information

The piston-pin circlip must be inserted fully in the ring groove of the piston.
Install piston pin circlip -1- on one side.

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Piston pin circlip
1. 4.1 Insert new piston pin circlip -1- into the ring groove of the piston -2- so that the ring gap is offset with respect to the piston crown (6 or 11 o'clock position).
  Press ring gap into the ring groove with your thumb.
2. 4.2 Carefully lever the piston pin circlip -1- into the ring groove using a small screwdriver while continuing to press it down.
3. 4.3 If the piston pin circlip -1- cannot be levered correctly into the ring groove, lever the other end into the ring groove first.
4. 4.4 Check that the piston pin circlip -1- is seated correctly.
Install connecting rods -1- .

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Connecting rod
1. 5.1 Insert connecting rod -1- into the piston -3- and check that it is positioned correctly.
2. 5.2 Coat piston pin -2- with fresh engine oil.
3. 5.3 Fit piston pin -2- and drive it in carefully using VW222A - drift .
Information

The piston-pin circlip must be inserted fully in the ring groove of the piston.
Install second piston pin circlip -1- .

Courtesy of PORSCHE CARS NORTH AMERICA, INC.

Piston pin circlip
1. 6.1 Insert new piston pin circlip -1- into the ring groove of the piston so that the ring gap -2- is offset with respect to the piston crown (6 or 11 o'clock position).
  Press one end into the ring groove with your thumb.
2. 6.2 Carefully lever the piston pin circlip -1- into the ring groove using a small screwdriver while continuing to press it down.
3. 6.3 If the piston pin circlip -1- cannot be levered correctly into the ring groove, lever the other end into the ring groove first.
4. 6.4 Check that the piston pin circlip -1- is seated correctly.
Check piston and connecting rod for smooth operation.
1. 7.1 If the piston does not move freely on the connecting rod: Disassemble piston again and remedy the cause.