engine MITSUBISHI SPYDER 1990 Service Repair Manual

ENGINE
BEARING CLEARANCE
(1) The. total: clearance of the main bearings can only be
determined by removing the weight of the crankshaft .
This is accomplished by having the engine turned upside
down on the engine stand. This will remove all the crank-
weight off the bearing surface.
(2) Place, a piece of Plastigage across the entire width of
the bearing shell in the approximately 6.35 mm
in.) off center and away from the oil holes. In addition,
suspect areas can be checked by placing the Plastig age
in the suspect area.
Torque the
bolts of the bearing being checked
to the proper specifications.
Caution
Do not rotate crankshaft, or the Plastigage may be
smeared.
(3) Remove the and compare the width of the flat-
tened Plastigage with the metric scale provided on the
package.
Standard value: mm in.)
Stretched
boltThreads are straight on line,
Unstretched bolt
MAIN BEARING BOLTS
(1) Since the main bearing bolts are torqued using a new
procedure, they should be examined BEFORE reuse.
If the threads are necked down, replace the bolts.
(2) Necking can be checked by holding a scale or st raight
edge against the threads. If all the threads do not contact
the scale, the bolt should be replaced.
CHECKING CRANKSHAFT END PLAY
(1) Mount a dial indicator to front of engine, locating probe
on nose of crankshaft.
(2) Move crankshaft all the way to the rear of its travel using
a lever inserted between a main bearing cap and a c rank-
shaft cheek, using care not to damage any bearing sur-
face, Do not loosen main bearing cap.
(3) Zero the dial indicator.
(4) Move crankshaft all the way to the front and re ad the
dial indicator.
Standard value: mm in.)
Limit: 0.37 mm
in.)
(5) Replace No. 3 main bearing if limit is exceeded and re-
measure.
(6) Replace crankshaft if limit is still exceeded.

11ENGINE OVERHAUL
OPTIONAL CRANKSHAFT END PLAY CHECK
(1) Move crankshaft all the way to the rear of its travel using
a lever inserted between a main bearing cap and a c rank-
shaft cheek, using care not to damage any bearing sur-
face. Do not loosen main bearing cap.
(2) Use a feeler gauge between number three thrust bearing
and machined crankshaft surface to determine end pl ay.
Revision

CONTENTS
CAMSHAFT AND CAMSHAFT OILCompression Pressure Check. . . . . . . . . . ..
SEAL. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21Curb Speed Check. . ... . . . .. . . . . . . . .
Drive Belt Tension Check and
CRANKSHAFT FRONT OIL SEAL. . . . . . . . . .26Adjustment.. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Mixture Check . . . . . . . . . . . . . . . . . . . . . . .
CRANKSHAFT PULLEY. . . . . . . . . . . . . . . . . . .20Ignition Timing Check
. . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . .13CRANKSHAFT REAR OIL SEAL27Lash Adjuster Check
. . . . . . . . . . .
Manifold Vacuum Check. . . . . . . . . . . . . . . . . .12
CYLINDER HEAD GASKET . . . . . . . . . . . . . . . .29 . .
SEALANTS. . . . . . . . . . . . . . . . . . . . . . . . . . .. .3
ENGINE ASSEMBLY. . . . . . . . . . . . . . . . . . . . . .15SERVICE. . . . . ... .
.....
.....
GENERAL INFORMATION. . . . . . . . . . . . . . . . . .2SPECIAL TOOLS. . . . . . . . . . . . . . . . . . . . . . . . . . .4
OIL PAN AND OIL SCREEN . . . . . . . . . . . . . . .24
ON-VEHICLE SERVICE. . . . . . . . . . . . . . . . . . . . .7
Basic Speed Adjustment
. . . . . . . . . . . . . . . . . . . . . . . Refer to GROUP
TIMING BELT. . . . . . . . . . . . . . . . . . . . . . . . . . . . .35
BELT . . . . . . . . . . . . . . . . . . . . . . . . . . .39
TROUBLESHOOTING
. . . . . . . . . . . . . . . . . . . . . . . 6

ENGINE General Information
GENERAL INFORMATION
Specifications
Number of cylinders
Bore
In-line OHV, SOHC
4
Stroke1
Piston displacement
Compression ratio9.5
Firing order
Counterbalance shaft Valve timing Intake valve Opens
Closes
Exhaust valve Opens
Closes Equipped
18” BTDC
58” ABDC
58” BBDC
18” ATDC
Lubrication system Pressure feed-full flow filtration
LUBRICATION SYSTEM
Rocker arm
Oil filter
TSB Revision
Oilpressure, Camshaft
screen

ENGINEService
SERVICE SPECIFICATIONS
Drive belt Tension (Ibs.) When checked
(For
When a new belt is installedtor)When a used belt is installed
DeflectionWhenchecked
mm (in.)When a new belt is installed
value> When a used belt is installed
Drive belt Tension
(Ibs.) When checked
(For power When a new belt is installed
steeringWhen a used belt is installed
DeflectionWhenchecked
mm (in.)When a new belt is installed
When a used belt is installed
Drive beltTension (Ibs.) When checked
A/C When a new belt is installed
When a used belt is installed
DeflectionWhenchecked
mm (in.)When a new belt is installed
When a used belt is installed
ignition timing at idle
ignition timing at idle
idle speed
contents
contents ppm
pressure (at 250 400 (psi)
pressure difference of all cylinder (psi)
ntake manifold vacuum
(in. Hg)
head bolt length mm (in.)
tensioner push rod movement mm (in.)
belt tension torque Nm
tensioner rod protrusion mm (in.)
belt tension mm (in.) Standard
Limit
,
490
686 (110.2 154.3)
7.5 9.0
10.0
245 490 (55.1 110.2)
1 5 4 . 3 )
343 441 (77.2 99.2)
5.5 8.0
4.5
6.0
255 333 (57.3 75.0)
382 441 (86.0 99.2)
255
333 (57.3 75.0)
6.5 7.5
5.5 6.0
6.5 7.5
3”
Approx. BTDC
0.5 or less
100 or less
1,350 (192) ,020 (145)
100 (14)
min. 60 (18)
99.4 (3.91)
Within 1
3.5 (2.6)
3 . 8 - 4 . 5
5 7
S E A L A N T S
ItemsS p e c i f i e d s e a l a n t
Oil pan, cylinder block and thermostat case assembl yMITSUBISHI GENUINE PART or equivalent
Flywheel bolt or drive plate bolt
Stud locking 4170 or
TSB Revision

ENGINE Special Tools , ,
SPECIAL TOOLS
ToolTool number and nameSupersessionApplication
Idle
502
tool
(MUT-II)
ROM pack
8991325
Supporting of the lash adjuster
Lash adjuster holder to prevent it from falling when
rocker shaft assembly is
moved or installed
3Camshaft oil seal installation
oil seal
Oil pan gasket cutter
Crankshaft pulley are removed or reinstalled.
Use together with
Camshaft pulley supporting
TSB RevisionI

Tools
ToolTool number and nameSupersession
Crankshaft rear oil seal
Crankshaft rear oiltion
seal installer
Handle
GENERAL SERVICE
TOOL
Engine lifter
engine assembly
when removing and installing
transaxle
Auto tensioner installation
Tensioner pulley
wrench
I
General service toolCrankshaft sprocket removal
Crankshaft sprocket
654
Cylinder head bolt
wrench (12)Removal and installation of
cylinder head bolt
TSB Revision

ENGINE Troubleshooting.
TROUBLESHOOTING
SymptomProbable causeRemedy
Compression too low Cylinder head gasket blown Replace gasket
Piston ring worn or damaged Replace rings
Piston or cylinder worn Repair or replace piston and/or cylinder
block
Valve seat worn or damaged Repair or replace valve and/or seat ring
Oil pressure drop Engine oil level too low Check engine oil level
Oil pressure switch faulty ‘Replace
pressure switch
Oil filter cloggedInstall new filter
Oil pump gears or cover worn Replace gears and/or cover
Thin or diluted engine oil Change engine oil to correct viscosity
Oil relief valve stuck (open) Repair relief valve
Excessive bearing clearanceR e p l a c e b e a r i n g s
Oil pressure too high Oil relief valve stuck (closed
) Repair relief valve
Noisy valves Incorrect lash adjuster Bleed air or replace lash adjuster
Thin or diluted engine oil (low oil pressure) Change engine oil
Valve stem or valve guide worn or damaged Replace valve and/or guide
Connecting rod noise/ Insufficient oil supply Check engine oil level
main bearing noise Low oil pressure Refer to “Oil pressure drop”
Thin or diluted engine oil Change engine oil
,
Excessive bearing clearanceReplace bearings
Timing belt noiseIncorrect belt tensionAdjust belt tension replace tim-
ing belt
engine Loose engine roll stopper (Front, Rear) Retighten
ing and vibration Loose transaxle mount bracket Retighten
Loose engine mount bracket Retighten
Loose center member Retighten
Broken transaxle mount insulator
Replace
Broken engine mount insulatorReplace
Broken roll stopper insulatorReplace
Revision

ENGINE On-vehicle Service
(22
Generator
pulley
Water
pulley
Adjus bolt
DRIVE BELT TENSION CHECK AND
A D J U S T M E N T
GENERATOR DRIVE BELT TENSION
Use the belt tension gauge to check belt tension the shown
point or check deflection by applying (22 to the
shown point. ,
Standard value: Tension: 245
490 (55.1 110.2
Deflection 9.0 11.5 mm
GENERATOR DRIVE BELT TENSION ADJUSTMENT
1. Loosen the nut of the generator pivot bolt.
2. Loosen the lock bolt.
3.Turn the adjusting bolt to adjust the belt tension or deflec-
tion to the standard value.
Standard value:
Items belt is belt is
Tension392
(88.2)
Deflection10.0
mm
value>
4Tighten the nut of the generator pivot bolt.
Tightening torque: 23 Nm (17
5. Tighten the lock bolt.
Tightening torque: 23 Nm (17
6. Tighten the adjusting bolt.Tightening torque: 10 Nm (7
TSB Revision

ENGINEO n - v e h i c l e S e r v i c e
pump pulley
Cranksh
pulley
POWER STEERING PUMP DRIVE BELT TENSION
CHECK
Use the belt tension gauge to check belt tension at the shown
point or check deflection by applying 98 (22 to the
shown point.
Standard value:
Tension: 245
490 (55.1 110.2 Ibs.)
Deflection: 5.5
8.0 mm
POWER STEERING PUMP DRIVE BELT TENSION
ADJUSTMENT
1. Loosen power steering pump fixing bolt (A, D).
2.Move power steering pump, tension belt moderately a nd
adjust tension.
Standard value:
Items
Tension
Deflection
mm (in.) When
a new belt isWhen a used is
installed
3. Tighten fixing bolt (A).
Tightening torque: 28 Nm (21
4. Tighten the remaining fixing bolts and
Tightening torque: Bolt
and 28 Nm (21
Bolt 22 Nm (16
5.Check the belt deflection amount and readjust if ne ces-
sary.
Caution
This check should be carried out after turning the
crankshaft one full rotation or more in the forward
direction (to the right).
COMPRESSOR DRIVE BELT TENSION CHECK
Use the belt tension gauge to check belt tension at the shown
point (a) or (b), or check deflection by applying 98 (22
Ibs.) to the shown point.
Standard value:
Tension: 255 333 (57.3 75.0 Ibs.)
Deflection: 6.5
7.5 mm
TSB Revision