1. QSF 2.8 tier3 remove damper replace by pulley
BFCEC
Xiong Yang

2. Introduction
In order to fit the market requirement reduce the after sales repair cost .
Consider remove damper and replace by pulley
Cummins Confidential

3. Design proposal The pulley is current production.
Damper
Pulley
inertia ring
rubber
The pulley is current production.
The different between Damper and Pulley is that remove rubber and inertia ring
2018/9/19
Cummins Confidential

4. Design proposal Scope of this change FA+EE FA+EE+CF FA+EE+HD
For FA+EE+CF+ HD application still use damper.
2018/9/19
Cummins Confidential

5. Wall-e NA without damper
Validation- TV test
Order
With damper
[Degree]
Without damper
Wall-e NA without damper
Firewall
without damper
engine speed
[rpm] 2 /
0.15 speed more than 3000 rpm 4
0.03
0.04
0.06
No test
0.15 speed more than 1500 rpm 6
0.02
0.15 speed more than 1100 rpm 8
0.01
0.15 all speed
Torsional vibration with or without damper same level
2018/9/19
Cummins Confidential

6. Validation- FEAD test FEAD test result meet requirement
With damper and without damper same level
2018/9/19
Cummins Confidential