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1B-46
ENGINES
TAPPET BODY
42811
Fig. 1B-72
Hydraulic Tappet Assembly
HOLLOW
P U S H R O D
C H A R G I N G C Y C L E
L E A K - D O W N
C Y C L E
8 0 4 4 3
Fig. 1B-73
Hydraulic Tappet Operation
(3) Remove push rods.
N O T E : Keep rocker arm assemblies and push rods in
the same order as removed.
(4) Remove intake manifold.
(5) Remove tappet from guide bore in engine block.
Cleaning and Inspection
(1) Release lockring.
(2) Remove plunger cap, metering disc, plunger as-
sembly and plunger return spring from tappet body.
N O T E : Keep the tappets and all components
in the
same order as removed.
(3) Clean all components of the hydraulic tappet
assembly in cleaning solvent to remove all varnish or
gum deposits.
(4) Visually inspect each tappet assembly for signs
of scuffing on barrel and face of tappet. Inspect tappet
face for wear using straightedge across tappet face. If
tappet face is concave, corresponding lobe on camshaft
is worn, requiring replacement of camshaft and tappets.
(5) Replace entire assembly if any component
shows evidence of wear or damage.
(6) Install plunger return spring, plunger, metering
disc and plunger cap in tappet body.
(7) Use push rod on plunger cap to compress
plunger assembly and install lockring.
Hydraulic Tappet Leak-Down Test
After cleaning and inspection, use Tester J-5790 to
test tappets for leak-down to ensure zero-lash operating
ability (fig. 1R-74).
Fig. 1B-74
Hydraulic Tappet Leak-Down Tester J-5790
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Troubleshooting
