Porshe 911 (997). Manual - part 29

 

  Index      Hummer     Porshe 911 997 series - service repair manual 2004-2008 year

 

Search            

 

 

 

 

 

 

 

 

 

Content   ..  27  28  29  30   ..

 

 

Porshe 911 (997). Manual - part 29

 

 

Mount for crankcase half 4-6 on engine support

25. Tighten third star screw for crankcase half 4-6 on engine support.

26. Remove belt pulley/vibration balancer.

27. Fit crankshaft sealing ring on belt pulley side → 137419 Removing and installing crankshaft sealing

ring - belt pulley side -"Installing" section.

28. Only position belt pulley/vibration balancer with fastening screw (to turn the crankshaft).

Measuring mandrel 9699/1

29. Check the position of the crankshaft using the measuring mandrel

9699/1

.

30. Fit crankshaft sealing ring on flywheel side. Use the insertion device 9699 for the assembly.

→ 135919 Removing and installing crankshaft sealing ring - flywheel side - "Installing" side .

Piston assembly, cylinder side 4-6:

31. Turn the crankcase at the assembly support so that cylinder bank 4-6 stands upwards.

32. Move crankshaft of cylinder 6 to TDC by turning it on the belt pulley/vibration balancer (in a

clockwise direction). Bore U6 on the belt pulley/vibration balancer must be aligned with the
fixing bore on the crankcase. Fix the crankshaft using a fixing pin 9595/1.

Guide for piston pin assembly

33.

Diagnostic system: reading out fault memory and activating systems

Installing pistons

273

Secure special tool centring aid 9602/5 to the crankcase using two countersunk crosshead
screws.

Note

Observe information on aligning piston ring gaps at all times.

• 

34. Prepare pistons for installation in the same way as cylinder bank 1-3 (piston rings, oiling, piston ring

tensioning clamp) .

Aligning connecting rod

Note

Leave the centring mandrel in the eye of the connecting rod until the relevant piston (4-6) contacts the
centring mandrel during assembly.

• 

35. Align connecting rod using the centring mandrel 9608

Piston in cylinder bore

36. Coat cylinder bore with new engine oil. Place piston 6 on cylinder bore 6 using the universal

piston ring restraining strap, 75-125 mm NR.55

.

Diagnostic system: reading out fault memory and activating systems

Installing pistons

274

Piston - installation position in crankcase

37. Pay attention to direction of assembly: arrow on piston crown always points to flywheel side

Pressing piston into cylinder bore

ATTENTION

Incorrect and careless assembly of pistons.

Component damage (pistons, piston rings, cylinder line)

• 

→ Assemble pistons carefully and gently.

→ Stop process immediately if there is increased resistance during assembly; eliminate the cause of the

problem.

38. Hold the piston ring restraining strap firmly and press piston in one move into the cylinder bore

using a plastic mandrel until the piston touches the centring mandrel

39. Check installation position of connecting rod: In the installation position, the recesses of the

twist lock in the connecting rod bearing point towards the oil pan.

Diagnostic system: reading out fault memory and activating systems

Installing pistons

275

Align piston connecting rod using the centring mandrel.

40. Align piston and connecting rod again using the centring mandrel 9608 before fitting the piston pins.

Inserting piston-pin circlip into assembly tube

41. Insert piston-pin circlip into the assembly tube of the special tool assembly tool 9602/1. Insert the

lug of the circlip so that it is aligned to the right in the groove.

Pressure pin in assembly tool

42. Insert pressure pin -1- carefully into assembly tube -2- , ensuring that the circlip does not pop out.

Diagnostic system: reading out fault memory and activating systems

Installing pistons

276

 

 

 

 

 

 

 

Content   ..  27  28  29  30   ..