Viscous Fan Clutches - Information

87BMW04

GROUP 11 Engine
Bulletin Number 11 05 87 (1419) Page 1 of 1
Montvale, NJ October 1987 Technical Dept.
This Service Information Bulletin supersedes S.I.s 11 04 84 (915) and 11 02 86 (1173). It consolidates and updates the information from previously published sources.

Please remove and discard S.I.s 11 04 84 (915) and 11 02 86 (1173) from your S.I. binder.

SUBJECT: Viscous Fan Clutches:

I. Storage information II. Noise during cold starts III. Tightening torque

MODELS: All

I. Storage information

It is no longer necessary to store viscous fan clutches upright or on an angle. This change is due to the installation of improved seals in the fan clutch assembly.

II. Noise during cold starts

Due to the basic design of the viscous clutch, fan noise may occur for up to 60 seconds after starting the engine in cool weather. This is because the fluid in the viscous fan coupling (which has entered the working chamber of the fan clutch) must be returned to the supply chamber by the pumping action of the clutch. Depending upon the ambient temperature, this pumping action could take up to 60 seconds, after which the fan begins to freewheel.

III. Tightening torque

Tightening torque for the viscous fan clutch of all engines is 40 + 10 N-m (29 + 7 ft.lbs.) However, when using Special Tool 88 88 6 115 040 the torque wrench must be set to 30 N-m/22 ft.lbs.