MITSUBISHI SPYDER 1990 Service Repair Manual

E N G I N E O V E R H A U L Cylinder
INSPECTION11390790119
Middle
Cut away view
of valve guide
measurement
locations
Bottom
Tester valve
sprin
CYLINDER HEAD
(1) Check the cylinder head gasket surface for flat ness by
using a straightedge and feeler gauge.
Limit: 0.1 mm
in.)
VALVE
(1) Clean valves thoroughly and discard burned, war ped and
cracked valves.
(2) Measure valve stems for wear.
(3) If valve stems are worn more than 0.05 mm
in.),
replace valve.
Standard value:
Intake
mm in.)
Exhaust
mm
VALVE GUIDES
(1) Remove carbon and varnish deposits from inside of valve
guides with a reliable guide cleaner.
(2) Using a small hole gauge and a
measure
valve guides in 3 places top, middle-and bottom. Re place
guides if they are not within specification.
Standard value:
Intake
mm
Exhaust mm in.)
Limit:
Intake 0.076 mm in.)
Exhaust 0.101 mm
in.)
TESTING VALVE SPRINGS
(1) Whenever valves have been removed for inspectio n, re-
conditioning or replacement, valve springs should be
tested. As an example, the compression length of th e
spring to be tested is 33.34 mm (1.313 in.).
Turn table of Tool until surface is in line with th e 33.34
mm (1.313 in.) mark on the threaded stud and the ze ro
mark on the front. Place spring over stud on the ta ble
and lift compressing lever to set tone device. Pull on
torque wrench until ping is heard. Take reading on torque
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1 1 E N G I N E O V E R H A U L Head and
wrench at this instant. Multiply this reading by This
will give the spring load at test length. Fractional measure-
ments are indicated on the table for finer adjustme nts.
Refer to specifications to obtain specified and allow-
able tensions.
Discard the springs that
cations.
Standard value: Free length 46 mm
in.)
Spring tensionV a l v e
m i n
i n . )
Valve open 459-611
mm
(123-137
in.)
(2) inspect each valve spring for squareness with a steel
square and surface plate, test springs from both en ds.
If the spring is more than 1.5 mm in.) out of square,
install a new spring.
REFACING VALVES AND VALVE SEATS
(1) The intake and exhaust valve seats and valve fa ce have
a 45 degree angle.
Exhaust valveI
Margin
Intake valve
(2) Inspect the remaining margin after the are refaced.
Exhaust valves with less than 0.95 mm
in.) margin
and intake valves with less than 1.05 mm in.)
should be discarded and replaced.
S t a n d a r d v a l u e :
Angle
Intake and Exhaust
Head Diameter Intake 34.67-34.93 mm
in.)
Exhaust mm
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(Overall)
Intake 111.49-111.99 mm (4.389-4.499 in.) Exhaust
mm in.)
Stem Diameter
Intake 5.934-5.952 mm in.)
Exhaust
mm in.)
Valve Margin
Intake 1.285-1.615 mm in.)
Exhaust
mm in.)
(3) When refacing valve seats, it is important that the correct
size valve guide pilot be used for reseating A
true and complete surface must
Measure the concentricity of valve seat using a va lve
seat dial indicator. Circular
should not exceed.
Limit:
0.05 mm in.) Indicator reading.
(5) Inspect the valve seat with Prussian blue to de termine
where the valve contacts the seat.
To do this, coat valve face LIGHTLY with Prussian b lue
then set valve in place. Rotate the valve with light pressure.
If the blue is transferred to the center of valve f ace, contact
is satisfactory. If the blue is transferred to top edge of
the valve face, lower valve seat with a 15degree stone.
If the blue is transferred to the bottom edge of va lve
face raise valve seat with a 65 degree stone.
Intake valve seat diameter 34.50 mm (1.358 in.)
Exhaust valve seat diameter 29.50 mm (1.161 in.)
Valve seats which are worn or burned can be reworke d
if correct angle and seat width are maintained. Otherwise,
cylinder head must be replaced.
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11ENGINE OVERHAUL Cylinder Head
(6) seat is properly positioned, the width of intake
and exhaust seats should be 0.9 to 1.3 mm
to
in.).
(7) Check valve tip to spring seat dimensions A aft er grinding
the valve seats or faces. Grind valve tip until
A is equal to 47.99 mm (1.889 in.) for exhaust valv e
and 48.04 mm (1.891 in.) for intake valve over spri ng
seat when installed in the head.
The valve tip chamfer may need to be reground to pr event
seal damage when the valve is installed.
(8)
the valve spring installed height after refacing
the valve and seat. Make sure measurements are take n
from top of spring seat to the bottom surface of spring
retainer.
If is greater than 38.00 mm (1.496 in.), install a
0.762 mm
in.) spacer in head counterbore under
the valve spring seat to bring spring height back w ithin
specification.
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ENGINE OVERHAUL Oil Pan,
Special tool
REMOVAL
(1) Remove flywheel or drive plate:
(2) Remove rear plate.
‘Remove oil filter.
(4) Remove adapter.
. .
(5) Drain engine oil and remove oil pan.
(6) Clean oil pan and all gasket surfaces.
(7) Remove oil pick-up tube.
( 8 ) R e m o v e c r a n k s h a f t using T o o l ,
Caution
Do not nick shaft seal surface or seal
(9) Use Tool to remove front,
careful not damage the
oil pump.
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11E N G I N E O V E R H A U L Oil Pan and Oil’
Revision
0057
(1) Apply Loctite 51817 to oil pump as shown in the figure.
Install oil-ring into the counter bore on the oil p ump body
discharge passage.
(2) oil pump slowly onto crankshaft until seated to
engine ‘block. Tighten fasteners to 23 Nm (17
(3) Install new seal by using Tool
(4) Place seal into opening with seal spring toward the inside
engine. Install seal until flush with cover.
(5) Install crankshaft sprocket using
bolt, washer and thrust bearing, from Special ‘Tool Kii
and Tool
,
.
(6) Install oil pick-up tube.

E N G I N E O V E R H A U L Oil ‘Pan and Oil Pump
Locating
I
adapter
Locate wrench
at base of filter
(7)Apply Loctite 18716 or equivalent at the to
bed plate parting line.
(8) Install the oil pan gasket to the plate. Mopar
Silicone Rubber Adhesive Sealant or equivalent to h old
in place.
(9) Install oil pan and tighten the to 12 Nm (9
(lO)Ensure O-ring is in the groove on adapter. Alig n roll
pin into engine block and tighten assembly to 55 Nm
(40
Caution
When servicing the oil filter avoid deforming the f ilter
can by installing the remove/install tool band strap
against the can-to-base lockseam. The join-
ing the can to the base is reinforced by the base
plate.
new filter gasket and install it on filter.
filter mounting surface. The surface must be
smooth, flat and free of debris or old pieces of rubber.
filter on until gasket contacts base. Tighten to
turn or Torque to 21 Nm (15
rear plate.
flywheel or drive plate.
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11E N G I N E O V E R H A U L Oil Pump
Gasket
Sprin
Oil pump body
Outer
Oil pump cover
PUMP
D I S A S S E M B L Y
(1) To remove the relief valve,’ proceed as
(a) Remove the threaded and gasket from the oil
Caution
Install oil pump pressure relief valve as shown
in the figure, or serious damage may occur.
(b) Remove spring and relief valve.
Remove oil pump cover screws, and lift off cover.
Remove pump rotors.
R E A S S E M B L Y
(1) Assemble pump, using new parts as required.
Install the inner rotor with chamfer. cast,
oil pump cover.
(2) Tighten cover screws to 12 Nm (9
(3) Install relief valve, spring, gasket cap. Tighten cap
to 54 Nm (39
(4) Prime oil pump before installation filling cavity
with engine oil.
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ENGINE OVERHAUL
INSPECTION
(1) Wash all parts in a suitable solvent and
for damage or wear.
(2)Mating surface of the oil pump should be smooth. Replace
pump cover if scratched or
(3)Lay a straightedge across the pump cover surface.
a feeler gauge of 0.076 mm ‘in.) or more can be
inserted between cover and straightedge, cover shou ld
be replaced.,
Limit: 0.076 mm in,)
(4 Measure thickness and diameter of outer rotor. If outer
rotor thickness measures 7.64 mm
in.) or less, or
if the diameter is 79.95 mm (3.148 in.) or less, re place
outer rotor.
(5) If inner rotor measures limit or less, replace inner rotor.
Limit: 7.64 mm in.)
(6) Slide outer rotor into pump housing, press to o ne side
with fingers and measure clearance between rotor an d
housing. If measurement exceeds the limit, replace hous-
ing only if outer rotor is in specification.
Limit: 0.39 mm in.)

1E N G I N E - ‘ O i l
Feeler
Outer0rotor
G a s k e tI
(7) Install inner rotor into pump housing. If clear ance between
inner and outer rotors exceeds the limit, replace b oth
rotors.
Limit: mm in.)
(8) Place a straightedge across the face pump
between bolt holes. a feeler mm
in.) or more can be inserted and
straightedge, replace pump
Limit: 0.102 mm ,
(9) Inspect oil pressure relief valve plunger for scoring-and.
free operation in its bore. Small marks may. be rem oved,
with wet or dry sandpaper.
relief valve spring has a free length
60.7 mm (2.39 in.). It should test between -and
when compressed to 40.5 mm (1.60 in.). ,
that fails to meet specifications.
.
oil pressure is and pump is within
inspect for worn engine bearings, or other for
oil pressure loss.
. .
, __ . ,
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