This tightening torque specs list is ONLY for the following Porsche models and years:
– 1993 to 1998 Porsche 911 (993) Carrera, 4, S, 4S – years 1993, 1994, 1995, 1996, 1997 and 1998
Click here for other Porsche models and year maintenance guides
Engine Torque Specs
| Location | Thread type | Tightening torque Nm (ftlb.) |
| Crankshaft/crankcase | ||
| Connecting rod bolt (Identification: 14) | M 9 x 1 .25 | First stage: 30Nm (22ftlb.) Final stage:1 x 90º +- 2º rotating angle Final check: 60 |
| Oil pump | M8 | 23Nm (17 ftlb.) |
| Crankcasebolt connection (through bolts) | M 10 x 1.25 | 50Nm (37 ftlb.) |
| Hexagon head nuts or hexagon head bolts to crankcase | M8 | 23Nm (17 ftlb.) |
| Double mass flywheel to crankshaft | M 10 x 1.25 x 70 | 85Nm (63 ftlb.) |
| Drive plate to crankshaft (Tiptronic) | 90Nm (66 ftlb.) | |
| V-belt pulley to crankshaft | M 14 x 1.5 | 170Nm (125 ftlb.) |
| Plug-pressure relief and safety valve | M 18 x 1.5 | 60Nm (44 ftlb.) |
| Oil drain plug for crankcase housing | M 20 x 1.5 | 50 + 5Nm (37 + 4 ftlb.) |
| Oil drain plug for thermostat housing | M 20 x 1.5 | 50 + 5Nm (37 + 4 ftlb.) |
| Screw-in neck in left-hand crankcase section (oil return to oil tank) | M 22 x 1.5 | 70Nm (52 ftlb.) |
| Screw-in flange in right-hand crankcase section (oil feed to oil pump) | M 24 x 1.5 | 90Nm (66 ftlb.) |
| Cylinder and cylinder head | ||
| Cylinder head bolts | First stage: 20Nm (15ftlb.) Final stage: 1 x 90° +- 2° rotating angle | |
| Camshaft housing/cylinder heads | M8 | 23Nm (17 ftlb.) |
| Knock sensor bridge to cylinder bank | M6 | 9.7Nm (7 ftlb.) |
| Knock sensor to knock sensor bridge | 20 +- 5Nm (15 +- 4 ftlb.) | |
| Engine -NTC to cylinder head 3 | 10…12Nm, max. 15Nm (7…9, max. 11 ftlb.) | |
| Rocker arm shafts | M6x35 | 13Nm (9 ftlb.) |
| Spark plugs | M 14 x 1.25 | 30Nm (22 ftlb.) |
| Timing gear | ||
| Sprocket to camshaft | M 12 x 1.5 | 120Nm (88 ftlb.) |
| Chain sprocket to camshaft (4-hole chain sprocket) | 1 st step 20Nm (15 ftlb.) 2nd step 90º rotation | |
| Gear / power steering pump to camshaft | 120Nm (88 ftlb.) | |
| Flange stud (slider andtensioning rail to crankcase) | 30Nm (22 ftlb.) | |
| Chain housing to crankcase | 23Nm (17 ftlb.) | |
| Chain housing cover | 9.7Nm (7 ftlb.) | |
| Valve cover to camshaft housing | M6 | 9.7Nm (7 ftlb.) |
| Bearing saddle / chain housing | 9.7Nm (7 ftlb.) | |
| Fan | ||
| Tensioning strap | 8Nm (6 ftlb.) | |
| Alternator pulley | 50 +- 5Nm (37 +- 4 ftlb.) | |
| Pulley section / idler | M6 | |
| Fan wheel for alternator cooling | 14Nm (10 +- 0.7 ftlb.) | |
| Exhaust system | ||
| Heat exchanger / cylinder head | 28Nm (21 ftlb.) | |
| Heat exchanger /catalytic converter or front muffler | 23Nm (17 ftlb.) | |
| Cataly1ic converter final muffler (ball clamp) | 25 to 30(18 to 22 ftlb.) | |
| Final muffler / tailpipe (ball clamp) | 25 to 30(18 to 22 ftlb.) | |
| Tensioning strap to catalytic converter or front muffler | 20Nm (15 ftlb.) | |
| Tensioning strap / final muffler | 20Nm (15 ftlb.) | |
| Oxygen sensor | M 18 x 0.5 | 50 to 60(37 to 44 ftlb.) |
| Plug to catalytic converter | M8x1 | 15(11 ftlb.) |
| Air injection lines | 25(18 ftlb.) | |
| Belt monitor | ||
| Bracket to crankcase | M6 | 15 to 20Nm (11 to 15 ftlb.) |
| Belt monitor to bracket | M6 | 9.7Nm (7 ftlb.) |
| Fuel system | ||
| Tank sender unit | 30 – 3Nm (22 – 2 ftlb.) | |
| Clutch / Double-mass flywheel (manufactured by Luk) | ||
| Double-mass flywheel to crankshaft | M10 x 1.25 x 70 | 85Nm (63 ftlb.) |
| Pressure plate | M 8 x 40 | 23Nm (17 ftlb.) |