Chevrolet 10 series 1973, Руководство по капитальному ремонту

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E N G IN E 6 -2 9
10. Remove main bearing caps and lift crankshaft out
of cylinder block.
11. Remove rear main bearing oil seal and main
bearings from cylinder block and main bearing
caps.
Cleaning and Inspection
1. Wash crankshaft in solvent and dry with com­
pressed air.
2. Measure dimensions of main bearing journals and
crankpins with a micrometer for out-of-round,
taper or undersize. (See Specifications.)
3. Check crankshaft for run-out by supporting at the
front and rear main bearings journals in "V"
blocks and check at the front and rear intermediate
journals with a dial indicator. (See Specifications.)
4. Replace or recondition the crankshaft if out of
specifications.
Sprocket or Gear Replacem ent (R efer to
Fig. 6 2 )
• On In-Line engines, remove crankshaft gear
using Tool J- 8105, install using Tool J-5590.
• On "Small V8" engines, remove crankshaft
sprocket using Tool J-5825, install using Tool
J-5590.
• On Mark IV V8 engines, remove crankshaft
sprocket using Tool J-1619, install using Tool
J-21058.
Installation
For installation of crankshaft, refer to the applicable
steps under "Engine Assembly" previously outlined.
If a new crankshaft is being installed on a 292 cu. in.
engine, the flywheel dowel pin hole must be reamed as
outlined in Truck Chassis Service Manual.
CAMSHAFT
In s p e c t io n
The camshaft bearing journals should be measured with
a micrometer for an out-of-round condition. If the
journals exceed .001" out-of-round, the camshaft should
be replaced.
The camshaft should also be checked for alignment. The
best method is by use of "V" blocks and a dial indicator
(fig. 64). The dial indicator will indicate the exact
amount the camshaft is out of true. If it is out more than
.0015" dial indicator reading, the camshaft should be
replaced.
On In-Line engines inspect the camshaft gear and thrust
plate for wear or damage. Measure the camshaft end
play. This should be .001" to .005" (fig. 64).
Oil Nozzle Replacement (In Line)
1. Remove nozzle with pliers (fig. 65).
2. Drive new nozzle in place (oil hole in vertical
position) using a suitable light plastic or rubber
hammer.
Camshaft Gear Replacem ent (In Line)
1. If the inspection indicated that the camshaft, gear
or thrust plate should be replaced, the gear must be
removed from the camshaft. This operation
requires the use of camshaft gear remover J-971.
2. Place the camshaft through the gear remover, place
end of remover on table of a press and press shaft
out of gear (fig. 66).
CAUTION:
Thrust plate must be positioned so
that woodruff key in shaft does not damage it
when the shaft is pressed out of gear. Also
support the hub o f the gear or the gear will be
seriously damaged.
3. To assemble camshaft gear thrust plate and gear
spacer ring to camshaft, firmly support camshaft at
back of front journal in an arbor press.
4. Place gear spacer ring and thrust plate over end of
shaft, and install woodruff key in shaft keyway.
Install camshaft gear and press it onto the shaft
until it bottoms against the gear spacer ring. The
end clearance of the thrust plate should be .001" to
.005" (fig. 64).
CAMSHAFT BEARINGS
Inspection
With the camshaft removed, inspect the bearings for
evidence of wear or damage. (Bearings showing the
above should be replaced.)
Removal
Camshaft bearings can be replaced while engine is
disassembled for overhaul, or without complete disas­
sembly of the engine. To replace bearings without
complete disassembly remove the camshaft and crank­
shaft leaving cylinder heads attached and pistons in
place. Before removing crankshaft, tape threads of
connecting rod bolts to prevent damage to crankshaft.
Fasten connecting rods against sides of engine so they
will not be in the way while replacing camshaft bearings.
1. With camshaft and crankshaft removed, drive
camshaft rear plug from cylinder block.
NOTE: This procedure is based on removal
of the bearings nearest center of the engine
first. With this method a minimum amount
of turns are necessary to remove all bearings.
2. Using Tool Set J-6098, with nut and thrust washer
installed to end of threads, index pilot in camshaft
front bearing and install puller screw through pilot.
3. Install remover and installer tool with shoulder
toward bearing, making sure a sufficient amount of
threads are engaged.
4. Using two wrenches, hold puller screw while turning
OVERHAUL MANUAL