Instruction manual

Y.S. .91H

Qty: M.A. USA p/n Description:

1 Stock Washer

1 #0619 M10 x 16 x .50 Shim

1 #0546-6 Base collet

1 #0579-4 Cooling Fan Hub

1 #0546-11 Upper Collet

1 #0331 M8 x 13 x .50 Shim

1 Hex Nut

Step 1: Installation of the Fan Hub Assembly On the Engine

Parts Required: Bag #

2 #0078 M4x12 Socket Head Bolts 7B

1 #0546-6 Base collet (9.5mm I.D.) 7B

2 #0546-16 Molded Rubber Dampeners 7B

1 #0579-4 Fan/hub Assembly 7A

1 #0546-21 Fan Tool 7A

2 #0331 M8.0x13.0x0.5 Flat Washers 7B

1 #0546-5 Collet (8.0mm I.D.) 7B

1 #0546-11 Upper Collet 7B

1 #0619 M10 x 16 x 0.50 Shim 7B

Refer to Drawing #7A

A. Following the previous guidelines, select the correct collets and related hardware and install the fan on your

engine of choice. Be sure to use Blue Loctite and tighten the hex nut with moderate torque using a ratchet

wrench of at least 6.0@ in length (typical 3/8@ drive ratchet wrench).

B. We highly suggest checking the run out of the fan hub with a dial indicator. This may be checked on the face

or the inside wall of the fan hub. A reading of 0.002@ or less is acceptable.

C. At this time, it is wise to make a simple test to check clearance between the clutch driver and the tip of the

engine crankshaft. Select the #122-44 Clutch/Bearing Block/Driver Assembly from bag 7B. NOTE: The

Delrin ball (bronze in color) and drive pins protruding from its base. As a test, press this end into the fan hub

until flat atop the hub. While this is not as it will ultimately be positioned, it will determine that a proper gap

exists between the tip of the crankshaft, the crank nut, and the clutch driver. If it will not press fully in place,

then the crankshaft must be shortened accordingly or the incorrect washer(s) has been selected for use under

the crank nut. This problem is rare but still important to consider. If necessary, place the engine/fan assembly

into a plastic bag (exposing only the tip of the crankshaft and use a Dremel tool with a carbide disc to remove

a little material from the crankshaft tip.

NOTE: The #122-44 Clutch/Bearing Block/Clutch Driver Assembly is provided to you temporarily

inserted

in the #122-51 Clutch Bell/Pinion Gear/Upper Bearing Block Assembly.

D. Select two #0546-16 Molded Rubber Dampeners. Examine each, noting that one side will have a 4.5mm hole

(sometimes a Athrough@ hole) and a small 2.0mm Adimple.@ This side will face up, away from the fan hub.

Each dampener can be installed dry or with talcum powder using a blunt tool or finger tips to insert fully into