P16-39

Subject: Tensioner Bracket Retrofit
Field Change Program:
Procedure
Procedure Number:
16-39
Coach Section:
16- Heating & A/C
P/N:
Revision:
A
08-27-1172
Date:
02/21/2020
Type:
Product Improvement
Application:
Coach Model
Model Year
VIN
J4500
2016 - 2018
65758 - 68800
Read this entire procedure before beginning work.
Use Safe Shop Practices at All Times.
To avoid personal injury:
a. Proper Personal Protective Equipment (PPE) must be worn. Safety glasses and
protective gloves are required for working with DEF Fluid.
b. Turn the main battery disconnect switch to the OFF position.
c. Ensure that both the front and the rear wheels are chocked.
d. Position the ENGINE RUN and ENGINE START switches on the engine
compartment remote control box to the OFF position.
e. Allow enough time for components to cool down prior to working in the engine
compartment.
P16-39
Tensioner Bracket Retrofit
1.0
Description
This procedure outlines steps to add a tensioner bracket to increase the tension in the
A/C Compressor belt.
2.0
Material requirements
ITEM
1
2
3
4
3.0
PART NO
08-27-1386
19-01-1526
19-02-0410
19-03-0497
QTY
1
2
2
2
U/M
EA
EA
EA
EA
DESCRIPTION
Bracket- AC Tensioner
Capscrew- 1/2-13 X 3”
Washer- FL, 1.75 ODX.531 ISX.134, ZN
Nut-Flg, 1/2-13 Yellow Zinc plating
Special Tools
Rachet strap (Vendor: U-Line, VPN: H-2068).
Belt tensioner gauge (Vendor: Napa, VPN: NBR-KR1)
Belt Alignment tool (Vendor: VibrAlign, APN: 100-BH2)
Belt tensioner gauge
4.0
Rachet Strap
Belt alignment tool
Procedure
Open the engine door using the latch behind the curbside service door.
Rotate the lever
counter clockwise
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P16-39
Tensioner Bracket Retrofit
Use a ratchet strap to clasp the AC belt tensioner. Remove and save the A/C belt.
Rachet strap
Remove and discard the nut, washer, and bolt securing the tensioner to the AC
compressor.
AC Compressor
Tensioner
Install tensioner bracket, MCI P/N: 08-27-1386, to tensioner using capscrew, MCI P/N:
19-01-1526, washer, MCI P/N: 19-02-0410, and nut, MCI P/N: 19-03-0497, as shown
below. Torque the nut to 89 Ft-Lb.
Nut, MCI P/N: 1903-0497
Tensioner bracket
Tensioner
Washer, MCI
P/N: 19-02-0410
Capscrew, MCI
P/N: 19-01-1526
Motor Coach Industries Ltd.
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P16-39
Tensioner Bracket Retrofit
Secure the other end of tensioner bracket to AC compressor using capscrew, MCI P/N:
19-01-1526, washer, MCI P/N: 19-02-0410, and nut, MCI P/N: 19-03-0497, as shown
below. Torque the nut to 89 Ft-Lb.
Tensioner bracket
Washer, MCI
P/N: 19-02-0410
Capscrew, MCI
P/N: 19-01-1526
Install the A/C compressor belt.
A/C Compressor belt
5.0
Verification
5.1
Belt alignment
Use the belt alignment tool to verify the alignment of the AC compressor pulley to the
pulley on the crankshaft following the instructions in the maintenance manual section
16A-2.
Laser line on the tool
Motor Coach Industries Ltd.
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P16-39
Tensioner Bracket Retrofit
5.2
Belt tension
Remove rachet from the AC belt tensioner.
Place belt tensioner gauge on top of the belt about 2 inches from the upper pulley as
shown in the picture below. Tension should be 140±5 Ft/Lb.
Belt Tensioner Gauge
End of the procedure
Motor Coach Industries Ltd.
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