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Cooling System - Tightening Torques - e90 BMW M3 E90

17 40 Additional Fan (electric)

TypeThreadTightening specificationMeasure
1AZElectric auxiliary fan on fan cowlE466 Nm
2AZElectronics for auxiliary fan on fan cowlE466 Nm

TIGHTENING TORQUE SPECIFICATION - ADDITIONAL FAN (ELECTRIC)

17 00 Coolant

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

TIGHTENING TORQUE SPECIFICATION - COOLANT

17 21 Engine Oil Cooler

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

TIGHTENING TORQUE SPECIFICATION - ENGINE OIL COOLER

17 22 Oil Cooler Pipes

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

TIGHTENING TORQUE SPECIFICATION - OIL COOLER PIPES

17 11 Radiator and Mounting Parts

TypeThreadTightening specificationMeasure
1AZRadiator to body
Self-tapping screwAllB6.39 Nm
AllM610 Nm
2AZDrain plug to radiatorAll2.5 Nm
3AZTemperature switch to radiator (91°C/99°C) max.All15 Nm
4AZExpansion tank to bodyAll9 Nm
M57TU/E654 Nm
5AZRadiator on module carrierE464 + 1 Nm
6AZRetaining plate, expansion tank, to radiatorE464 + 1 Nm
7AZFan cowl on radiatorE464 + 1 Nm
8AZPlug in radiator (temperature switch omitted)E36/7/M54M14 x 1.515 Nm
9AZMounting plate to radiatorM57TU/E654.5 N
10AZRadiator bracketAll2.5 Nm

TIGHTENING TORQUE SPECIFICATION - RADIATOR AND MOUNTING PARTS