1993 CHEVROLET DYNASTY Service Manual

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Page 1681 of 2438

CHEVROLET DYNASTY 1993 Service Manual CYLINDER BORE INSPECTION
The cylinder walls should be checked for out- of-
round and taper with Tool C-119 (Fig. 4). If the cylinder
walls are badly scuffed or scored, the cylinder block
should be re

Page 1682 of 2438

CHEVROLET DYNASTY 1993 Service Manual Refer to specifications (Fig. 8).
(2) Check piston ring to groove clearance: (Fig. 9).
Refer to specification (Fig. 8).
PISTON RINGSÐINSTALLATION
(1) The No. 1 and No. 2 piston rings have a differ-

Page 1683 of 2438

CHEVROLET DYNASTY 1993 Service Manual (5) Position piston ring end gaps as shown in (Fig.
13). (6) Position oil ring expander gap at least 45É from
the side rail gaps but noton the piston pin center or on
the thrust direction. Stagger

Page 1684 of 2438

CHEVROLET DYNASTY 1993 Service Manual CONNECTING RODS
INSTALLATION OF CONNECTING ROD BEAR- INGS
Fit all rods on one bank until complete.
The bearing caps are not interchangeable and should
be marked at removal to insure correct assembly.

CONNECTING RODS
INSTALLATION OF CONNECTING ROD BEAR- INGS
Fit all rods on one bank until complete.
The bearing caps are not interchangeable and should
be marked at removal to insure correct assembly. The bearing shells must be installed with the tangs
inserted into the machined grooves in the rods and
caps. Install cap with the tangs on the same side as the
rod. Limits of taper or out-of-round on any crankshaft
journals should be held to .025mm (.001 inch). Bear-
ings are available in .025mm (.001 inch), .051mm (.002
inch),.076mm (.003 inch), .254mm (.010 inch) and
.305mm (.012 inch) undersize. Install the bearings
in pairs. Do not use a new bearing half with an
old bearing half. Do not file the rods or bearing
caps. (1) Follow procedure specified in the Standard Ser-
vice Procedure Section for Measuring Main Bearing
Clearance and Connecting Rod Bearing Clearance
(Fig. 16). The rod bearing bolts should be examined be-
fore reuse. If the threads are necked down the
bolts should be replaced (Fig. 19). Necking can be checked by holding a scale or straight
edge against the threads. If all the threads do not
contact the scale the bolt should be replaced. (2) Before installing the nuts the threads should be
oiled with engine oil. (3) Install nuts on each bolt finger tight then alter-
nately torque each nut to assemble the cap properly. (4) Tighten the nuts to 54 N Im PLUS 1/4 turn (40 ft.
lbs. PLUS 1/4 turn). (5) Using a feeler gauge, check connecting rod side
clearance (Fig. 17). Refer to (Fig. 18) for specifications.
CRANKSHAFT SERVICE
CRANKSHAFT MAIN BEARINGS
Bearing caps are not interchangeable and should
be marked at removal to insure correct assembly.
(Fig. 1) Upper and lower bearing halves are NOT in-
terchangeable. Lower main bearing halves of 1, 3
and 4 are interchangeable. Upper main bearing
halves of 1, 3 and 4 are interchangeable.
CRANKSHAFT MAIN JOURNALS
The crankshaft journals should be checked for ex-
cessive wear, taper and scoring. (Fig. 6) Limits of
taper or out-of-round on any crankshaft journals
should be held to .025mm (.001 inch). Journal grind-
ing should not exceed .305mm (.012 inch) under the
standard journal diameter. Do NOT grind thrust
faces of Number 2 main bearing. Do NOT nick crank
pin or bearing fillets. After grinding, remove rough
edges from crankshaft oil holes and clean out all pas-
sages.
CAUTION: With the nodular cast iron crankshafts
used it is important that the final paper or cloth pol-
ish after any journal regrind be in the same direc-
tion as normal rotation in the engine.
Upper and lower Number 2 bearing halves are
flanged to carry the crankshaft thrust loads and are
NOT interchangeable with any other bearing halves
in the engine (Fig. 2). All bearing cap bolts removed
during service procedures are to be cleaned and oiled
Fig. 18 Connecting Rod Specifications
Fig. 19 Check for Stretched (Necked) Bolts
Fig. 17 Checking Connecting Rod Side Clearance
9 - 118 3.3/3.8L ENGINE Ä

Page 1685 of 2438

CHEVROLET DYNASTY 1993 Service Manual before installation. Bearing shells are available in
standard and the following undersizes: 0.025mm (.001
inch), .051mm (.002 inch), .076mm (.003 inch), .254mm
(.010 inch), and .305mm (.012 inch). Ne

before installation. Bearing shells are available in
standard and the following undersizes: 0.025mm (.001
inch), .051mm (.002 inch), .076mm (.003 inch), .254mm
(.010 inch), and .305mm (.012 inch). Never install an
undersize bearing that will reduce clearance below
specifications.
REMOVAL (1) Remove oil pan and identify bearing caps before
removal. (2) Remove bearing caps one at a time. Remove
upper half of bearing by inserting Special Main Bear-
ing Tool C-3059. (Fig. 3) into the oil hole of crankshaft. (3) Slowly rotate crankshaft clockwise, forcing out
upper half of bearing shell.
INSTALLATION Only one main bearing should be selectively
fitted while all other main bearing caps are prop-
erly tightened. When installing a new upper bearing shell, slightly
chamfer the sharp edges from the plain side. (1) Start bearing in place, and insert Main Bearing
Tool C-3059 into oil hole of crankshaft (Fig. 3). (2) Slowly rotate crankshaft counter-clockwise slid-
ing the bearing into position. Remove Special Main
Bearing Tool C-3059. (3) Install each main cap and tighten bolts finger
tight. (4) Tighten number 1, 3 and 4 main cap bolts to 41
N Im + 1/4 Turn (30 ft. lbs.+ 1/4 Turn).
(5) Rotate the crankshaft until number 6 piston is
at TDC. (6) To ensure correct thrust bearing alignment the
following procedure must be done: (a) Move crankshaft all the way to the rear of its
travel. (b) Then, move crankshaft all the way to the
front of its travel. (c) Wedge a appropriate tool between the rear of
the cylinder block and rear crankshaft counter-
weight. This will hold the crankshaft in it's most
forward position. (d) Tighten the #2 Thrust Bearing cap bolts to
41 N Im + 1/4 Turn (30 ft. lbs.+ 1/4 Turn). Remove
the holding tool.
CHECKING CRANKSHAFT END PLAY
(1) Mount a dial indicator to front of engine, locat-
ing probe on nose of crankshaft (Fig. 4). (2) Move crankshaft all the way to the rear of its
travel. (3) Zero the dial indicator.
(4) Move crankshaft all the way to the front and
read the dial indicator. Refer to (Fig. 5) for specifica-
tion.
CRANKSHAFT END PLAY CHECKÐOPTIONAL
(1) Move crankshaft all the way to the rear of its
travel using a lever inserted between a main bearing
Fig. 3 Removing and Installing Upper Main Bearing With Special Tool C-3059Fig. 1 Main Bearing Cap Identification
Fig. 2 Main Bearing Identification
Ä 3.3/3.8L ENGINE 9 - 119

Page 1686 of 2438

CHEVROLET DYNASTY 1993 Service Manual cap and a crankshaft cheek using care not to damage
any bearing surface. Do notloosen main bearing cap.
(2) Use a feeler gauge between number 2 thrust
bearing and machined crankshaft surface to det

Page 1687 of 2438

CHEVROLET DYNASTY 1993 Service Manual CRANKSHAFT OIL SEALS SERVICE
REMOVAL
Pry out rear seal with screwdriver. Be careful not
to nick or damage crankshaft flange seal surface or
retainer bore (Fig. 8).
INSTALLATION
(1) Place Special Seal

Page 1688 of 2438

CHEVROLET DYNASTY 1993 Service Manual ENGINE LUBRICATION SYSTEM
The lubrication system is a full flow filtration pres-
sure feed type. Oil from the oil pan is pumped by a
internal gear type oil pump directly coupled to the
crankshaft. It

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