Ranger 4WD L4-122 2.0L SOHC (1984)
Valve Guide: All Technical Service Bulletins
Engine - Low Power/Rough Running
Article No. 84-22-13
POWER - LOW OF POWER OR ROUGH RUNNING OVER 40 MPH 2.0L (ALL CALIBRATIONS)
LIGHT TRUCKS 1983-84 RANGER (2.0L)
CALIBRATIONS: All 3-41 Calibrations
Reduction of power and rough running engines at highway speeds over 40 mph may be due to insufficient valve stem-to-valve guide clearance or to
sticking valves, resulting from deposit build-up in the guides. New chrome valves are now released to correct these conditions.
Perform normal fuel and ignition system diagnosis before performing the following procedures.
Remove cylinder head per procedures outlined in the Truck Shop Manual Group 21-05.
Remove the cam followers and valves.
NOTE:
It is important to keep parts in order.
FIGURE 13
Inspect all valve stems and replace them if there are signs of wear, galling, scoring, etc. (Figure 13).
When replacing valves, ensure that the valve stem-toguide clearance is as stated on page 31-05-30 of the 1983 Ranger Truck Shop Manual. Ream all
valve guides with a standard size reamer to clean out the guide to the following diameter for both engines.
.3433 in. to .3443 in. (8.745 mm to 8.720 mm)
Maintain valve guide clearance as follows:
Intake-0.069 mm .0027 in. Max.
0.025 mm .0010 in. Min.
Exhaust-0.081 mm .0032 in. Max.
0.038 mm .0015 in. Min.
-
Service Limit - .0055 Max.
Refer to Section 21-01-17 of the 1983 Ranger/1984 Bronco II Truck Shop Manual for valve guide clearance measuring procedures.
Replace valve stem seals D42E-6A517-AB in eight (8) places per Truck Shop Manual Group 21-05.
Clean and/or replace spark plugs as required, Install cylinder head per procedure specified in Truck Shop Manual Group 21-05.
PART NUMBER
PART NAME
CLASS
E5TZ-6507-F
Valve-Intake-Std (2.0)
C
E5TZ-6505-F
Valve-Exh.-Std (2.0)
C
E3TZ-6079-D
Cyl. Hd. Gasket Kit (2.0)
AM
E43Z-6571-A
Stem Seal (intake)
A
E5ZZ-6571-A
Stem Seal (Exhaust)
B
OTHER APPLICABLE ARTICLES: 84-13-11
