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Cooling System - Tightening Torques (n54) BMW Z4 E89

17 40 Additional Fan (electric)

TypeThreadTightening specificationMeasure
1AZ Electric auxiliary fan on fan cowlE466 Nm
2AZ Electronics for auxiliary fan on fan cowlE466 Nm

TIGHTENING TORQUE SPECIFICATION - ADDITIONAL FAN (ELECTRIC)

17 00 Coolant

TypeThreadTightening specificationMeasure
1AZ Hose clamps to coolant hoses 32... 48 mm dia.All2.5 Nm
2AZ Bleed screw (WAF 8) to thermostat housingAll, without E468 Nm
Plastic bleed screws to coolant linesE462 -0.5/+1 Nm
3AZ Level switch (WAF 30) to coolant expansion tankAll3 Nm
4AZ Bleed screw to water valve or auxiliary water pumpE90/E913.5 Nm

TIGHTENING TORQUE SPECIFICATION - COOLANT

17 21 Engine Oil Cooler

TypeThreadTightening specificationMeasure
1AZ Engine oil cooler to bodyAll14 Nm
Oil cooler vapor extraction guide to trim panelE36/M3B4.84 Nm

TIGHTENING TORQUE SPECIFICATION - ENGINE OIL COOLER

17 21 Engine oil cooler and lines

TypeThreadTightening specificationMeasure
1AZ Engine oil cooler line to oil filter control housingN54M8 x 2519 Nm
2AZ Engine oil cooler line to engine oil cooler flangeN54M8 x 2519 Nm
3AZ Engine oil cooler to bracket, engine carrierN54M6 x 208 Nm

TIGHTENING TORQUE SPECIFICATION - ENGINE OIL COOLER AND LINES

17 22 Oil Cooler Pipes

TypeThreadTightening specificationMeasure
5AZ Cap nut on transmission oil cooler (on radiator) and on transmissionAllM18 x 1.520 Nm
5HP30M22 x 1.528 Nm
6AZ Oil lines on transmission
Hollow boltAllM16 x 1.537 Nm
7AZ Oil lines on transmission oil coolerA 5 S 300 J28 Nm
Hollow boltAllM14 x 1.527 Nm
8AZ Screw-in fitting on transmissionAllM14x1.5 und M16x1.537 Nm
9AZ Oil hose on oil pipeE2328 Nm
10AZ Oil pipe bracket on radiatorE232 Nm
11AZ Oil pipe bracket on bodyE236.5 Nm
12AZ Oil cooler on transmission5HP3010 Nm
13AZ Transmission oil cooler line to transmissionN42M821 Nm

TIGHTENING TORQUE SPECIFICATION - OIL COOLER PIPES

17 11 Radiator and Mounting Parts

TypeThreadTightening specificationMeasure
1AZ Radiator to body
Self-tapping screwAllB6.39 Nm
AllM610 Nm
2AZ Drain plug to radiatorAll2.5 Nm
3AZ Temperature switch to radiator (91°C/99°C) max.All15 Nm
4AZ Expansion tank to bodyAll9 Nm
M57TU/E654 Nm
5AZ Radiator on module carrierE464 + 1 Nm
6AZ Retaining plate, expansion tank, to radiatorE464 + 1 Nm
7AZ Fan cowl on radiatorE464 + 1 Nm
8AZ Plug in radiator (temperature switch omitted)E36/7/M54M14 x 1.515 Nm
9AZ Mounting plate to radiatorM57TU/E654.5 Nm
10AZ Radiator bracketAll2.5 Nm

TIGHTENING TORQUE SPECIFICATION - RADIATOR AND MOUNTING PARTS

17 10 Radiator, expansion tank (N52K, N54)

TypeThreadTightening specificationMeasure
1AZ Fan cowl to coolant radiatorN52K/N544.5 Nm
2AZ Coolant radiator to module carrierN52K/N544.5 Nm
3AZ Intercooler to module carrierN544.5 Nm
4AZ Coolant expansion tank to bodyN52K/N54M68 Nm
5AZ Coolant pipe to front axle carrierN54M67.3 Nm
6AZ Transmission oil cooler to fan cowlN52K/N544.5 Nm

TIGHTENING TORQUE SPECIFICATION - RADIATOR, EXPANSION TANK