Belt Pulley Installation Onto Keyway-Type Crankshaft - Subaru Robin Engines SX17 Instructions For Use Manual

5. BELT PULLEY INSTALLATION ONTO KEYWAY-TYPE CRANKSHAFT

When installing the belt pulley and/or clutch onto keyway-type
crankshaft (PTO shaft), proper and correct arrangements are needed.
The following illustration shows the correct installation of the applicable
component parts.
Pulley
Key
Bolt
Washer
PTO shaft
■ SAE (inch) keyway-type crankshaft
Washer; Use the washer (material; SS41P) with the thickness
described below;
Washer 0.177 (4.5)
Thickness
in. (mm)
ROBIN genuine part 020-00801-40,
Washer
Thickness; in. (mm) 0.177 (4.5)
OD; in. (mm) 1.100 (28)
ID; in. (mm) 0.335 (8.5)
Material;
Bolt; Select the proper bolt and tighten it to the specified
tightening torque, as mentioned below;
Thread dimensions 5/16 – 24UNF2B
Effective 0.63 to 0.87
thread length (16 to 22)
in. (mm)
Strength
Tightening Torque 14.8 - 16.2
ft•lb.(N•m)(kgf•cm) (204 - 224)
(No ROBIN genuine part is available.)
6
SX17/21 SX30
0.248 (6.3)
or over or over
(NA)
SS41P
SX17/21 SX30
7/16 – 20UNF2B
0.71 to 1.06
(18 to 27)
"8T" or higher
36.9 - 44.3
(20 - 22) (50 - 60)
(510 - 612)
Key Location
When using the belt pulley with the extended boss on both
side as shown in the illustration, put the spacer so that the
key stays in the keyway portion of the crankshaft.
Proper
Key should be within this portion.
Key
Spacer
Improper
Key
Belt Pulley Installation
Install the belt pulley in the no over-hang condition as shown
in the illustration.
Correct
Pulley
Crankshaft (PTO)
Incorrect
Pulley
Large over-hang
Crankshaft (PTO)