Hydraulic Valve Tappet Components; Hydraulic Valve Tappet Operation; Hydraulic Valve Tappet Removal - Jeep J-10 Series 1982 Technical & Service Manual

Table of Contents

METERING VALVE

Fig. 1B-56 Hydraulic Valve Tappet Components

forced past the plunger check valve and fills the cham

ber between the plunger and tappet body. When the

chamber is full, additional oil in the plunger body un

seats the metering disc, and a spurt of oil flows up inside

the push rod to lubricate the rocker assembly. These

events described above all occur while the tappet is on

the heel of the cam lobe. As the cam turns, the lobe

begins exerting force on the tappet body. This force is

transmitted by the trapped oil in the tappet chamber to

the plunger and finally to the push rod and rocker as

sembly. The engine valve opens. While the valve is open,

the trapped oil is subjected to considerable pressure and

some of it escapes between the plunger and the tappet

body (leak-down). The cycle is completed as the cam lobe

rotates back to the starting position and another charg

ing cycle begins. In this way, zero valve lash is main

tained and engine noise is reduced.

(1) Drain cooling system.

NOTE: Drain coolant in clean container if reusable.

(2) Remove cylinder head cover.

(3) Remove bridge and pivot assemblies and rocker

CHARGING CYCLE

Fig. 1B-57 Hydraulic Valve Tappet Operation

NOTE: When removing the two capscrews from each

bridge, alternately loosen each screw one turn at a time

to avoid damaging bridge.

(4) Remove push rods.

NOTE: Retain rocker arms, bridge and pivot asseyn-

blies and push rods in the same order as removed.

(5) Remove cylinder head and gasket.

(6) Remove tappets through push rod openings in

block with Hydraulic Valve Tappet Remover and In

staller Tool J-21884 (fig. 1B-58).

Rg. 1B-58 Hydraulic Valve Tappet Removal

Troubleshooting