Chevrolet 70 1969 Series, Руководство по ремонту

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E N G IN E 6-18
installer set. Use a wood block to prevent crankshaft from
turning as nut is turned to force the crankshaft gear into
position.
T IM IN G IDLER G E A R A N D SHAFT
(4 0 1 M A N D 4 7 8 M E N G IN ES)
IN S P E C T IO N
1. Check fit of idler gear on idler shaft. Desired clear­
ance between shaft and bushing in gear is 0.001 to
0.0025 inch. If shaft is worn, install new shaft. If
bushing in gear is scored or worn, replace hushing as
instructed later under “ Idler Gear Bushing Replace­
ment."
2. Clean oil passages in shaft, and inspect tapped holes.
Threads must be in good condition.
3. Inspect idler gear thrust plate for wear.
4. Inspect idler gear teeth for wear and damage. If gear
is worn or damaged, obtain a new gear and bushing
assembly for use when assembling engine.
IDLER G E A R B U S H IN G REP LA CEM EN T
1. Use arbor press and remove bushing from gear.
2. Press new bushing squarely into gear. Bushing must
camshaft idler gear with smooth finish. Bore must be
square w'ith face of gear and must he concentric with
tooth pitch line.
not project beyond either front or rear surface of gear
hub.
3. Bore bushing to 1.4005 to 1.4015 inch diameter in
E N G IN E FRONT CO V ER, OIL SEAL,
A N D C R A N K SH A F T PULLEY
IN S P E C T IO N
Inspect engine front cover assembly for evidence of
damage. If cover is in good condition, the gasket surfaces
should be cleaned, and the oil seal assembly should be in­
spected. It is a good practice to rcplace the oil seal assem­
bly whenever engine is disassembled.
Inspect surface on crankshaft pulley hub which is con­
tacted by front cover oil seal. Use a magnifying glass to
detect scratches or roughness. If surface is grooved or
rough a new' pulley should be installed, or the hub should
be reworked to accom m odate a service spacer. Instruc­
tions for reworking the crankshaft pulley hub are given
previously in this section under “ Crankshaft Pulley Hub
Rew'ork."
E N G IN E FRO NT C O V E R
O IL SEAL REP LA CEM EN T
A special tool (J-7879-I0) is available for installing
OUTER ROTOR
PUMP BODY
\ FEELER GAUGE
\
■ > PUMP BODY
CHECKING INNER-TO-OUTER ROTOR CLEARANCE
MEASURING ROTOR END CLEARANCE
ts
73
Figure 29 — Checking for W ear at Engine Oil Pum p Rotors
CHEVROLET SERIES 70-80 H EAVY DUTY TRUCK SH O P M A N U A L