Rocker Arm - Noise in B Series Truck 22L Engine (1988)
Rocker Arm Assembly: All Technical Service Bulletins
Rocker Arm - Noise
Category 1
Applicable Model/s 1987-90 B2200
Subject HYDRAULIC LASH ADJUSTER (HLA) NOISE
Bulletin No.
045/89
Issued
11/8/89
Revised
12/22/89
DESCRIPTION
If you encounter a complaint of HLA noise which continues for approximately one (1) minute, the rocker arms may need replacing.
As illustrated, the diameter of the oil passage "A" of the modified rocker arm has been enlarged (0.031 in. to 0.078 in.). With this modification, oil
pressure to the HLA increases and the period of noise occurrence is shortened.
PARTS INFORMATION
NO. PART NUMBER
DESCRIPTION
QTY
1
F240 12 131B
Rocker Arm, 1 & 3
4
2
F240 12 151B
Rocker Arm, 2 & 4
4
3
F240 12 130B
Rocker Arm Assy., 1 & 3
4
4
F240 12 150B
Rocker Arm Assy., 2 & 4
4
NOTE:
In accordance with the modification of the rocker arm, the part number of the rocker arm assembly (with HLA) has been changed also.
The revised section is indicated by an asterisk. Please replace the original bulletin with this revised bulletin.
NOTES FOR REPAIR
1.
The HLA itself is not faulty. Use the original HLA with a new rocker arm. When installing them, be careful not to damage the O-ring of the
HLA.
2.
When removed from the rocker arm shaft, if the contact area of the rocker arm appears scratched, mend the scratch or replace the rocker arm
shaft. Otherwise, due to the oil pressure, fluid leakage may result.
3.
Please instruct the customers to observe scheduled maintenance intervals, otherwise inadequate amounts of oil or oil deterioration may cause
the problem to reoccur.
VIN OF PRODUCTION CHANGE
Since the September 1, 1989 production, the modified rocker arm has been introduced.
JM2UF*1**K0760514
September 1, 1989
