28-4 Chapter 2 Part B 2.OL and 2.4L four-cylinder engines
good idea as long as you have them off), remove the retaining bolts and
slip the rocker arms and springs off the shafts (see illustration). Keep the
parts in order so you can reassemble them in the same positions.
6 Thoroughly clean the parts and inspect them for wear and damage.
Check the rocker arm faces that contact the camshaft and the adjusting
screw tips (see illustration). Replace any parts that are damaged or ex-
cessively worn. Also, make sure the oil holes in the shafts are not plugged.
Ins talla tion
5.3 Remove the rocker arm assembly bolts (arrows) - 2.OL
engine shown
5
Rocker arm assembly - removal, inspection and installation
Removal
Refer to illustration 5.3
1 Remove the valve cover (see Section 4).
2 Position the number one piston at Top Dead Center, compression
(see Section 3).
3 Loosen the rocker arm shaft mounting bolts, l/4-turn at a time each,
until the spring pressure is relieved (see illustration). Remove the bolts.
4 Lift the rocker arms and shaft assembly, or the individual rocker arms,
from the cylinder head. If you’re working on an engine with hydraulic lash
adjusters, be sure not to let the adjusters fall out of the rocker arms. Wrap
pieces of tape around the ends of the rocker arms to keep the adjusters in
place.
Inspection
Refer to illu!;trations 5.5 and 5.6
5
If you wish to disassemble and inspect the rocker arm assemblies (a
Refer to illustrations 5.7, 5.8a, 58b and 5.8~
7 On rocker arms with adjusting screws, loosen the locknuts and back
off the adjusters (see illustration) until they only protrude 1 mm
(0.040-inch).
8 Lubricate ail components with assembly lube or engine oil and reas-
semble the shafts. When installing the rocker arms, shafts and springs,
note the markings and the difference between the left and right side parts
(see illustrations). Place the notches in the end of the shaft up (see iiius-
tration) and install the bolts through the cap into the shafts to keep them
aligned until they are ready to be installed onto the cylinder head.
9 If removed, insert the hydraulic lash adjusters into the rocker arms
and wrap tape around the ends of the rocker arms to prevent the adjusters
from falling out. Note: New a@usters are primed with diesel oil. To make
sure the oil is not spilled from the adjuster while handling, avoid tilting the
adjuster as much as possible. If the oil is spilled from the adjuster, bleed
the adjuster as described in Section 7.
10 Position the rocker arm assemblies on the cylinder head and install-
the mounting bolts finger ttght. Check the markings on the caps to identify
the correct journal number and intake/exhaust position, On models with
hydraulic lash adjusters, remove the tape from the rocker arms.
11 Tighten the bolts in several stages until the torque listed in this Chap-
ter’s Specifications is reached. Tighten the bearing caps a little at a time,-
starting with the centerjournals and working toward the ends of the cam-
shaft.
12 On adjustable-type rockerarms, adjust thevalveclearances (cold) as
described In Chapter 1.
13 Temporarily install the valve cover and run the engine until it is fully
warmed up,
14 Readjust the valves whrle the engine is still warm (see Chapter 1).
15 Reinstall the remaining parts in the reverse order of removal.
16 Run the engine and check for oil leaks and proper operation.
Shaft, left
FRONT
Rocker arms
(in cars for Canada, same rocker arms
for both intake and exhaust valves)
/
Spring, right
Rocker arm for intake valve (cars for U.S.A only)
5.5 Exploded view of the rocker arms and shafts (typical)
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