DETROIT DIESEL 53
E N G I N E COOLING FAN
The engine cooling fan is driven by a pair of V-drive
belts from the crankshaft pulley (Fig. 1).
The sealed ball bearings, used in the fan hub assembly
on the former In-line engines, is pre-lubricated and
requires no further lubrication.
The tapered roller bearings, used in the fan huh on
Effective with engine serial number
current In-line engines. are pressure
new fan huh assemblies are being
lubricated prior to assembly. The cavity between the
used on the In-line engines. The new assemblies are
bearings is packed with Chevron BRB No. 2 grease or
similar to the integral cast shaft and bracket design,
an equivalent performance grease at the time the huh
with taped roller bearings, currently used on the
is assembled. Also the fan hub cap is packed
V-type engines (Fig. 5).
approximately 75% full of grease. Repack the fan hub
assembly as outlined in the assembly procedure. The
hub cap at the front and a seal at the rear of the hub
prevents leakage of the lubricant.
The helt-driven fan 15 bolted to a combination fan hub
and pulley which turns on a sealed hall bearing
assembles (former In-line engine) or two tapered roller
Remove Fan, Hub and Adjusting Bracket
(current In-line engines). The
crankshaft driven fan is bolted to the crankshaft
The fan blades must rotate in a vertical plane parallel
with and a sufficient distance from the radiator core.
Fig. 1- Belt-Driven Fan Mounting
SEC. 5.4 Page 1