engine MITSUBISHI SPYDER 1990 Service Repair Manual

Piston,ENGINE OVERHAUL and Cylinder
(6) Position ring expander at 45
the side gaps but ‘on the pin canter
on the thrust direction. Staggering important
for
control.
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piston,
ENGINE
(1) Before installing pistons and connecting rod assemblies
into the bore, be sure that compression ring gaps a re
staggered so that neither is in line with oil ring rail gap.
Front of engine
(2) Before installing the ring compressor, make sur e the
ring expander ends are butted and the rail
as shown in the figure.
.
(3) Immerse the piston head and rings in clean engine oil,
slide the ring compressor, over the piston. Be sure that
position of rings does not change during this opera tion.
(4) The arrow should face toward the front of the engine.
Install the pistons.
(5) Rotate crankshaft so that the connecting journal is
on the center of the cylinder bore. rod and piston
assembly into cylinder bore and guide rod over the crank-
shaft journal.
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Piston, ConnectingENGINE OVERHAUL and
(6) Tap the piston down in cylinder bore, using a hammer
handle. At the same time, guide connecting rod into
position on connecting rod journal.
(7) Install connecting rod bearings selected based
obtained connecting rod bearing
(Refer to CONNECTING ROD BEARING CLEARANCE.)
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11
Piston, Connecting Rod
ENGINE OVERHAUL and
INSPECTION
BLOCK
(1) Clean cylinder block thoroughly and check all core hole
plugs for evidence of leaking.
(2) Examine block and cylinder bores for cracks or fractures.
Front
A
CYLINDER BORE
(1) The cylinder walls should be checked for out-of-round
and taper with Tool or equivalent cylinder
bore out-of-round is 0.051 mm in.) maximum, and
cylinder bore taper is 0.051 mm in.)
If the cylinder walls are badly scuffed or’scored, the cylin-
der block should be rebored and pistons
and rings fitted.
Whatever type is
used, boring and honing should be closely
with the fitting of pistons and rings so that speci fied clear-
ances may be maintained.
(2) the cylinder bore at three levels in directions
A and B. Top measurement should be 10 mm
in.)
down and bottom measurement should
mm
in.) up from bottom of bore.
Standard value: 87.5 mm (3.445 in.)
PISTONS
(1) Piston and cylinder wall must be clean and dry. Piston
diameter should be measured 90 degrees to piston pi n
at size location shown in the figure. Cylinder bores should
be measured halfway down the cylinder bore and tran s-
verse to the engine crankshaft center
Correct piston
to bore clearance must be established in order to a ssure
quiet and economical operation.
Standard value: mm 7 in.)
(2) Pistons and cylinder bores should be measured a t normal
room temperature, 21
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piston,
ENGINE OVERHAUL Cylinder Block
CONNECTING BEARING
(1) Place a piece of Plastigage across the, width of
bearing in the cap 6.35
mm off center and away -from the hole.
suspect areas can be checked, by placing in
the suspect area.
(2) Before assembling the rod with in place;
‘the crankshaft must be rotated the connecting rod
being checked starts moving toward the top of the e ngine.,
Only then should the cap be and torqued
to the specification.
Do not rotate the crankshaft while assembling the cap
or the Plastigage may be smeared, giving inaccurate re-
sults.
(3) Remove the bearing cap and compare the width of the
flattened Plastigage with the metric scale provided on
the package.
Standard value: mm in.)
Limit: 0.075 mm
in.)
bolt
Threads are not straight on line
Threads are straight
line,
bolt
CONNECTING ROD BEARING ,
(1) Since the connecting rod bearing cap are
using a new procedure, they should examined BE-
FORE reuse. If the threads are necked’
the bolts.
(2) Necking can be checked by holding a scale
edge against the threads. If all the threads contact,
the scale, the bolt should be replaced. .
,
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ENGINE Crankshaft
Oil holes
I N S T A L L A T I O N
(1) Install oil level gauge (dipstick).
(2) Install oil pressure switch.
,
,
(3) Install knock sensor. Tighten knock sensor to 10 Nm
(7 torque. Over or under tightening effects knock
sensor performance, possibly causing improper spark con-
t r o l .
(4) Select proper thickness main bearing shells by referring
to CRANKSHAFT BEARING CLEARANCE.
NOTE
Upper and lower No. 3 bearing halves are flanged to
carry the crankshaft thrust loads and are NOT inter change-
able with any other bearing halves in the engine. Bearing
shells are available in standard and the following under-
sized:
0.016 mm, 0.032 mm, 0.250 mm.
Never install an undersize bearing that will reduce clear-
ance below specifications.
(5) Install the main bearing shells with the lubric ation groove
in the cylinder block.
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ENGINE OVERHAUL
NOTE
All upper bearing
in the crankcase have oil grooves.
All lower bearing shells installed in the (bedplate ) main
bearing caps are plain. Crankshaft end play is cont rolled
by a flanged bearing on the number three main beari ng
journal.
(6) Make certain oil holes in block line up with oi l hole in
bearings and bearing tabs seat in the
tab slots.
(7) Oil the bearings and, journals and install cran kshaft.
Caution
D o get oil on
If may effect the sealer ability the
to cylinder block.
(8) Apply 1.5 to 2.0 mm to in.) bead of Loctite
19614 to cylinder block as shown the figure.
(9) Install main bearing cap together with lower’
bearing shells.
Caution
Use only the specified “on
or damage to
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11E N G I N E.
installing the bolts, the threads should be oiled
with engine oil.
Crankcasebaffle
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main bearing to engine block bolts
thru finger tight, then torque main bearing bolts to
75 Nm (55
in sequence shown in the figure.
main bearing to engine block bolts (A
thru finger tight, then torque each bolt to 28 Nm (20
in sequence shown in the figure.
crankcase baffle into the opening in the
Attach baffle to main bearing fasteners.

ENGINE OVERHAUL
2
Oil seal
95059
seal
new front seal into opening with seal spring towards
the inside of engine. seal by using Tool
until flush with oil pump cover.
Caution
if burr or scratch is present on the crankshaft edge
(chamfer), with 400 grit sand paper to prevent
seal damage during of new seal.
NOTE
When installing seal, no lube on seal is needed.
Tool on crankshaft. This is a
pilot tool with a magnetic base.
seal over pilot tool. Make sure you can read
the words THIS SIDE OUT on seal. Pilot tool should
remain on crankshaft during installation of seal.
the seal into the block using Special Tool
and handle until the tool bottoms out against
the block.
Caution
If the seal is driven into the block past flush, this
may cause an oil leak.
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11E N G I N E. .
INSPECTION
CRANKSHAFT MAIN JOURNALS
The crankshaft journals should be checked for excessive
wear, taper and scoring. Limits of taper or
on any crankshaft journals should be held. to mm.
in.). Journal grinding should not exceed 0.305 mm
in.) under the standard Do NOT
grind thrust faces of 3 journal. Do NOT
nick crank pin or journal fillets. After grinding, remove
rough edges from crankshaft oil holes and clean out all
passages.,
Caution.
With the nodular cast iron
tant that the final paper or journal
regrind be in the same direction as normal rotation’
in the engine.
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