Power Bloc ALT
Installation/Calibration Manual
|
Item
# |
Description |
Qty |
Item
# |
Description |
Qty |
|
1 |
Fixed
Flange |
1 |
10 |
Weight |
According to calibration |
|
2 |
Bushing |
1 |
11 |
Threaded
Cap |
According
to calibration |
|
3 |
Spacer
Shim |
1
or 0 |
|
|
|
|
4 |
Spring
Support |
1 |
13 |
Assembly
Block |
3 |
|
5 |
Shim
Washer |
1
or 0 |
14 |
Cap |
1 |
|
6 |
Spring |
1 |
15 |
Lock
Washer |
1 |
|
7 |
Sliding
Flange |
1 |
16 |
Fixing
Bolt |
1 |
|
8 |
Block |
3 |
|
|
|
|
9 |
Adaptor |
According to calibration |
|
|
|
Pulley Removal from the
Vehicle
Remove
the Fixing Bolt (15) from the motor Power Take-Off.
At
this point in the disassembling, certain parts are apt to fall out.
So
as not to misadjust the Pulley, take note of the order in which the parts were
assembled.
It
is important to mark the direction of Pulley Rotation thereby ensuring correct
rotation after reassembling.
Remove
the Fixed Flange (1) using the Puller suited to the vehicle.
Screw
in the Puller until the Pulley is freed from the Motor Shaft (1).
To
assemble the Fixed Flange:
Assemble components (2) to (6) onto the Fixed Flange (1).
To
assemble the Sliding Flange:
use
a C-clamp to hold the two Flanges close together.
Mounting the Blocks and cap
According
to the desired calibration, choose the required assembly between the two Models
(A
or B).
Insert
the parts as per the chosen Model Diagram (A or B).
So as not to deteriorate the item (11), apply a Torque Value of 13 to 35 in.-lbs. (1.5 to 4 Nm).
Position
the three Blocks with the narrow side facing the Sliding Flange (7).
In order to obtain
maximum pulley efficiency, it is desirable to verify that the three Blocks be
assembled with an equal number of Weights.
When
mounting the Cap, make sure to align the Shaft Notch with the inside shape of
the Cap.
Mounting the pulley on vehicle
While mounting onto
the Motor Shaft, make sure that the Cap and Blocks are held in place.
While
preventing Pulley rotation, apply the Tightening Torque Value with a Torque
Wrench as per the following table:
Nominal
Bolt Diameter Torque Value Torque Value
(ft.-lbs.) (Nm)
7/16
- 20 NF 61 to 75 83 to 102
1/2
- 20 NF 94 to 114 128 to 155
ENGINE SPEED UPON ACCELERATION :
For
more competitive performance, or better fuel economy, the user may increase or
reduce engine acceleration speed. The weights in the three Blocks determine
engine speed.
The
lighter the Blocks, the higher engine RPM. By and large, adding a # X-81-3 (3.4
grams) Weight to each of the 3 Blocks reduces engine speed by 100 RPM. The
opposite is true if one wishes to increase engine speed. This effect is
cumulative if one adds or removes many Weights.
To
ensure proper Pulley equilibrium, the three Blocks must contain precisely the
same number of Weights.
SPEED
UPON ENGAGEMENT :
Though
Block weight has a direct effect upon the engine RPM at which the vehicule
starts moving, it is mainly the choice of Spring that determines Pulley speed
engagement. There exists a wide selection of Springs for the Powerbloc family
of Pulleys.
Powerbloc
Pulleys are pre-calibrated in plant, thereby offering an engagement speed that
satisfies most users. However, engagement speed may be modified by changing the
Spring. A lighter Spring will lower the engagement speed, thereby allowing for
smoother starts and improved vehicle control at very low speed. Inversely, a
heavier Spring will produce starts which are more abrupt and competitive.