Ranger 4WD L4-140 2.3L SOHC (1984)
Valve: Customer Interest
Engine - Rough Running/Lack of Power
Article No. 84-13-11
POWER - REDUCTION OF POWER OR ROUGH RUNNING OVER 40 MPH (2.0L/2.3L) ALL CALIBRATIONS
LIGHT TRUCKS 1983-84 RANGER (2.0L/2.3L)
CALIBRATIONS: All 3-41 & 3-49 Calibrations
Concerns of 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 by sticking valves, resulting from deposit build-up in the guides.
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 9
Inspect all valve stems and replace them if there are signs of wear, galling, scoring, etc. (Figure 9).
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.
