Service manual

181 CID (3.0L) 4 CYLINDER GM ENGINE
SERVICE MANUAL NUMBER 26
90-861329--1 MARCH 1999 Page 3A-21
Removal
1. Remove as previously outlined:
a. Rocker arm covers.
b. Push rod cover.
IMPORTANT: Keep valve push rod and hydraulic lifter from each valve together as a
matched set and mark or store them so they can be reinstalled in the same location
later.
c. Rocker arm assemblies and push rods.
2. Make matching marks on all lifters as to location and orientation in bores, to allow reas-
sembly in exact position on camshaft lobes (so that the roller’s bearing and roller will roll
in the same direction on the same lobe, if reused). Remove valve lifters.
Cleaning and Inspection
1. Thoroughly clean all parts in cleaning solvent and inspect them carefully.
2. If any parts are damaged or worn, entire lifter assembly should be replaced.
3. If outer lifter body wall is scuffed or worn, inspect cylinder block lifter bore.
4. If push rod seat is scuffed or worn, inspect push rod.
Installation
IMPORTANT: It is recommended that the engine oil be changed and a new oil filter be
installed whenever servicing valve lifters or camshaft
IMPORTANT: Before installing lifters, coat the lifter with engine oil. If new lifters or
a new camshaft have been installed, an additive containing EP lube (such as General
Motors Cam and Lifter Prelube or equivalent) should be poured over camshaft lobes
before installing lifters.
IMPORTANT: DO NOT install used valve lifters if a new camshaft has been installed.
1. Install valve lifters into bores.
2. Install push rod cover, using new gaskets and torque to specification.
3. Install distributor, positioning rotor to number 1 cylinder position, then connect primary
lead at coil.
4. Install distributor cap and spark plug wires.
5. Adjust valves to specifications.
6. Install rocker arm cover, torque tp 40 lb-in. (4.5 Nm).
7. Adjust ignition timing, carburetor idle speed and mixture.
Index