1993 CHEVROLET DYNASTY Service Manual

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Page 1609 of 2438

CHEVROLET DYNASTY 1993 Service Manual CRANKSHAFT SERVICE
CRANKSHAFT MAIN BEARINGS
Bearing caps are not interchangeable and should
be marked at removal to insure correct assembly.
Upper and lower bearing halves are NOT inter-
changeable.

CRANKSHAFT SERVICE
CRANKSHAFT MAIN BEARINGS
Bearing caps are not interchangeable and should
be marked at removal to insure correct assembly.
Upper and lower bearing halves are NOT inter-
changeable. Lower main bearing halves of 1, 2, 4 and
5 are interchangeable. Upper main bearing halves of
1, 2, 4 and 5 are interchangeable (Fig. 7).
CRANKSHAFT MAIN JOURNALS
The crankshaft journals should be checked for ex-
cessive wear, taper and scoring. Limits of taper or
out-of-round on any crankshaft journals should be
held to .025mm (.001 inch). Journal grinding should
not exceed .305mm (.012 inch) under the standard
journal diameter. Do NOT grind thrust faces of Num-
ber 3 main bearing. Do NOT nick crank pin or bear-
ing fillets. After grinding, remove rough edges from
crankshaft oil holes and clean out all passages.
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 3 bearing halves are
flanged to carry the crankshaft thrust loads and are
NOT interchangeable with any other bearing halves
in the engine (Fig. 7). All bearing cap bolts removed
during service procedures are to be cleaned and oiled
before installation. Bearing shells are available in
standard and the following undersized: 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 clear-
ance below specifications.
MAIN BEARING SERVICEÐCRANKSHAFT NOT REMOVED
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. 8) 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. 8). (2) Slowly rotate crankshaft counter-clockwise slid-
ing the bearing into position. Remove Special Main
Bearing Tool C-3059.
CHECKING CRANKSHAFT END PLAY
(1) Mount a dial indicator to front of engine, locating
probe on nose of crankshaft (Fig. 9). (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. 10) for specifications.
OPTIONAL CRANKSHAFT END PLAY CHECK
(1) Move crankshaft all the way to the rear of its
travel using a lever inserted between a main bearingFig. 7 Main Bearing Identification
Fig. 8 Removing and Installing Upper Main Bearing With Special Tool C-3059
Ä 2.2/2.5L ENGINE 9 - 43

Page 1610 of 2438

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

Page 1611 of 2438

CHEVROLET DYNASTY 1993 Service Manual Necking can be checked by holding a scale or straight
edge against the threads or by running a M11 x 1.50
nut the full length of the thread. If all the threads
do not contact the scale or if the nu

Page 1612 of 2438

CHEVROLET DYNASTY 1993 Service Manual BALANCE SHAFTS CARRIER ASSEMBLY
REMOVAL The following components will remain intact dur-
ing carrier removal. Gear cover, gears, balance shafts
and the rear cover. (1) Remove chain cover and driven b

Page 1613 of 2438

CHEVROLET DYNASTY 1993 Service Manual (5) Turn crankshaft until number one cylinder is
at Top Dead Center (TDC). The timing marks on the
chain sprocket should line up with the parting line
on the left side of number one main bearing cap.

(5) Turn crankshaft until number one cylinder is
at Top Dead Center (TDC). The timing marks on the
chain sprocket should line up with the parting line
on the left side of number one main bearing cap.
(Fig. 21). (6) Place chain over crankshaft sprocket so that
the nickel plated link of the chain is over the timing
mark on the crankshaft sprocket (Fig. 21). (7) Place balance shaft sprocket into the timing
chain (Fig. 17) so that the timing mark on the
sprocket (yellow dot) mates with the (lower) nickel
plated link on the chain (8) With balance shaft keyways pointing up 12
o'clock) slide the balance shaft sprocket onto the nose
of the balance shaft. The balance shaft may have to
be pushed in slightly to allow for clearance.
THE TIMING MARK ON THE SPROCKET,
THE (LOWER) NICKEL PLATED LINK, AND
THE ARROW ON THE SIDE OF THE GEAR
COVER SHOULD LINE UP WHEN THE BAL-
ANCE SHAFTS ARE TIMED CORRECTLY. (9) If the sprockets are timed correctly install the
balance shaft bolts and tighten to 28 N Im (250 in.
lbs.). A wood block placed between crankcase and
crankshaft counterbalance will prevent crankshaft
and gear rotation.CHAIN TENSIONING
(1) Install chain tensioner loosely assembled.
(2) Position guide on double ended stud making sure
tab on the guide fits into slot on the gear cover. Install
and tighten nut/washer assembly to 12 N Im (105 in.
lbs.). (3) Place a shim 1mm (.039 inch) thick x 70mm (2.75
inch) long or between tensioner and chain. Push ten-
sioner and shim up against the chain. Apply firm
pressure (5.5 to 6.6 lbs.) directly behind the ad-
justment slot to take up all slack (chain must have
shoe radius contact as shown in Fig. 22). (4) With the load applied, tighten top tensioner bolt
first, then bottom pivot bolt. Tighten bolts to 12 N Im
(105 in. lbs.), Remove shim. (5) Install carrier covers and tighten screws to 12
N Im (105 in. lbs.).
INTERMEDIATE SHAFT SERVICE
REMOVAL
CAUTION: The oil pump and distributor must be
removed before attempting to remove intermediate
shaft.
(1) Hold sprocket with Tool C-4687 and adaptor Tool
C-4687-1 when removing or installing screw (Fig. 23). (2) See Timing System and Seals for intermediate
seal removal and replacement. (3) Remove retainer screws (Fig. 24).
(4) Remove retainer and lay aside.
(5) Remove intermediate shaft.Fig. 21 Balance Shaft Timing
Fig. 22 Chain Tension Adjustment
Ä 2.2/2.5L ENGINE 9 - 47

Page 1614 of 2438

CHEVROLET DYNASTY 1993 Service Manual INSTALLATION
(1) Lubricate distributor drive gear when installing.
(2) Apply Mopar Gasket Maker as shown in (Fig.
25) and install intermediate shaft retainer. (3) Install retaining screws and torque

Page 1615 of 2438

CHEVROLET DYNASTY 1993 Service Manual CYLINDER BLOCK, PISTON AND CONNECTING ROD ASSEMBLY SERVICE
PISTON AND CONNECTING RODÐREMOVAL
(1) Remove top ridge of cylinder bores with a reliable
ridge reamer before removing pistons from cylinder

Page 1616 of 2438

CHEVROLET DYNASTY 1993 Service Manual CYLINDER BLOCK CLEANING AND INSPECTION
(1) Clean cylinder block thoroughly and check all
core hole plugs for evidence of leaking. (2) If new core plugs are installed, Refer to Engine
Core Oil and Cam

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