1991 MITSUBISHI ECLIPSE low oil pressure

9-1
ENGINE
CONTENTSNOSAA-
ENGINE<1.8L
Engine>..................
24CRANKSHAFT, FLYWHEEL AND
DRIVE PLATE................................................
69
CYLINDER
BLOCK.........................................72
CYLINDERHEADANDVALVE
...................
53CYLINDER HEAD GASKET
...........................
36ENGINE ASSEMBLY
.....................................31ENGINE MOUNTING
....................................
28ENGINE ROLL STOPPER
.............................
30FRONT CASE, OIL PUMP AND
SILENT SHAFT
..............................................
58
OILPANANDOILSCREEN........................34
PISTON AND CONNECTING ROD
..............
65ROCKER ARMS AND ROCKER SHAFTS..
..51ROCKER ARMS, ROCKER ARM SHAFTS
AND CAMSHAFT
..........................................48
SERVICE ADJUSTMENT PROCEDURES..
...24TIMING BELT
................................................41TRANSAXLE MOUNTING
............................
29
ENGINE <2.0L DOHC Engine> . . . . . .
74CAMSHAFTS AND CAMSHAFT
OIL SEALS
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .84CAMSHAFTAND
ROCKERARM. . . . . . . . . . . . . . . .109CRANKSHAFT, FLYWHEEL AND
DRIVE PLATE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .132
CYLINDERBLOCK. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .136
CYLINDERHEADANDVALVE
. . . . . . . . . . . . . . . . . . .112CYLINDER HEAD GASKET
...........................90ENGINE ASSEMBLY
.......................................81ENGINE MOUNTING
......................................77ENGINE ROLL STOPPER
...............................
79FRONT CASE, OIL PUMP AND
SILENT SHAFT
..............................................117OIL PAN AND OIL SCREEN
..........................
87
PISTONANDCONNECTING
ROD..............127SERVICE ADJUSTMENT PROCEDURES..
.....76TIMING BELT
................................................
85TRANSAXLE MOUNTING
............................78
GENERALINFORMATION................2
SPECIAL TOOLS...............................20
SPECIFICATIONS...............................8General Specifications
................................8Sealants and Adhesives
.............................19Service Specifications
.................................8Torque Specifications
.................................18
TROUBLESHOOTING........................23Compression Too Low
Connecting Rod Noise/Main Bearing Noise
Excessive Engine Rolling and Vibration
Noisy Valves
Oil Pressure Drop
Oil Pressure Too High
Timing Belt Noise

ENGINE - Troubleshooting9-23
--Symptom
Compression too lowProbable cause
Cylinder head gasket blown
Piston ring worn or damage
Piston or cylinder wornRemedy
Replace gasket
Replace rings
Repair or replace piston and/or cylinder
block
Valve seat worn or damageRepair or replace valve and/or seat ring
Oil pressure dropEngine oil level too lowCheck engine oil level
Oil pressure switch faultyReplace oil pressure switch
Oil filter cloggedInstall new filter
Oil pump gears or cover wornReplace gears and/or cover
Thin or diluted engine oilChange engine oil to correct viscosity
Oil relief valve stuck (opened)Repair relief valve
Excessive bearing clearanceReplace bearings
Oil pressure too highOil relief valve stuck (closed)Repair relief valve
Noisy valvesIncorrect lash adjusterBleed air or replace lash adjuster
Thin or diluted engine oil (low oil pressure)Change engine oil
Valve stem or valve guide worn or damageReplace valve and/or guide
Connecting rod noise/Insufficient oil supplyCheck engine oil level
main bearing noise
Low oil pressureRefer to “Oil pressure drop”
Thin or diluted engine oilChange engine oil
Excessive bearing clearanceReplace bearings
Timing belt noiseIncorrect belt tensionAdjust belt tension
Excessive engine rollingLoose engine roll stopper (Front, Rear)Retighten
and vibration
Loose transaxle mount bracket
Loose engine mount bracket
Loose center member
Broken transaxle mount insulatorReplace
Broken engine mount insulator
Broken engine roll stopper insulator

ENGINE <1.8L Engine> - Timing Belt
TIMING BELT
- REMOVAL AND INSTALLATION,
50-65 Nm
36-47 ft.lbs.Pre-removal Operation
@Removal of Under Cover
\ 16-22 ftlbs.\
lo-12 Nm
7-9 ft.lbs.
I28
15-22 Nm
11-16 ft.lbs.
3hO Nm
26-29 ft.lbs.
110-130 Nm(( \\ _ 60-94 ftlbs.
15-16 Nm-23-27 Nm
11-13 ft.lbs.17-20 ft.lbs.12-15 Nm
9- 11 ft.lbs.OlAO555
Removal steps
1. Clamp for pressure hose (power steering)
4*2. Engine mount bracketI)* 3. Drive belt (power steering)
4. Tensioner pulley bracket
H 5. Drive belt (air conditioner)
l + 6. Drive belt (alternator)
7. Water pump pulley (power steering)
8. Water pump pulley
9. Damper pulley
10. Adapter
11. Crankshaft pulley
I)4 12. Timing belt front upper cover
13. Gasket
l 14. Timing belt front lower cover
15. Gasket
16. Access cover
17. Crankshaft sprocket bolt
18. Special washer
Adjustment of timing belt tensioner
l *
:: 19. Timing beltl 4 20. Timing belt tensioner
I)+ 21. Tensioner spacer
l 22. Tensioner spring
23. Camshaft sprocket
4*24. Oil pump sprocket
25. Crankshaft sprocket
l 26. Flange
27. Timing belt tensioner “B”
~~ l 28. Timing belt “B”
l 4Adjustment of timing belt “B” tension
29. Right silent shaft sprocket
l * 30. Spacer
~~ 31. Crankshaft sprocket “B”32. Key
33. Left engine support bracket
34. Timing belt rear upper cover
35. Timing belt rear lower cover
NOTE(1) Reverse the removal procedures to reinstall.
(2)
4* : Refer to “Service Points of Removal”.
(3) l 4 : Refer to “Service Points of Installation”.

ENGINE <1.8L Engine> - Timing Belt9-47
Timing mark
Nut
;olt diameter x lengthim (in.)
6x50(.23 x 1.97)
6
x 38(.23 x 1.50)(3) Turn the crankshaft clockwise by two teeth of the
camshaft sprocket.
Caution
As the purpose of this procedure is to apply the
proper amount of tension on the timing belt, be
sure not to rotate the crankshaft counterclockwise
or place pressure on the belt to check the amount of
tension.(4) Apply force on tensioner toward turning direction, (in
the direction of the arrow) such that no portion of the
belt raises out in portion A, place the belt on the
camshaft sprocket such that the belt sprocket teeth arefully engaged.
(5) Tighten the tensioner installation bolt and tensioner
spacer in that order.
Caution
If the tensioner spacer is tightened first, the ten-
sioner will rotate with it and belt tension be thrown
out of adjustment. Always tighten the bolt first.(6) Check to see that the clearance between the outside of
the belt and the cover are within the standard value by
grasping the tension side (between the camshaft
sprocket and oil pump sprocket) of the centre part of
the timing belt between the thumb and index finger.
Standard value: 12 mm (.40 in.)
14. INSTALLATION OF TIMING BELT FRONT LOWER
COVER/12. TIMING BELT FRONT UPPER COVERNote that the timing belt lower and upper cover attaching
bolts differ in size from one place to another.
6.TENSION ADJUSTMENT OF THE ALTERNATOR DRIVE
BELTRefer to GROUP
14-Service Adjustment Procedures.
5. TENSION ADJUSTMENT OF THE AIR CONDITIONER
COMPRESSOR DRIVE BELTRefer to GROUP
24- Service Adjustment Procedures.
3.DEFLECTION ADJUSTMENT OF POWER STEERING OIL
PUMP DRIVE BELTRefer to GROUP 1
g-Service Adjustment Procedures.

ENGINE <2.0L DOHC Engine> - Timing Belt
TIMING BELT
REMOVAL AND INSTALLATION
I
Pre-removal Operation*Removal of Under Cover
I
50-65 Nm36-47 ft.lbs.
50-65“Nm36-47 ft:lbs.30-60-80
Nm22-20-3\0
Nm14-22 ftlbs.
lo-i2 Nm7-9 ftlbs.
Removal steps
1. Clamp for pressure hose (power steering)2. Bracket
3. Engine mount bracket
4. Clamp of return pipe (power steering)
5. Drive belt (alternator)6. Drive belt (power steering)
7. Tensioner pulley bracket
8. Drive belt (air conditioner)9. Water pump pulley
10. Water pump pulley (power steering)11. Crankshaft pulley12. Timing belt front upper cover13. Timing belt front lower cover
14. Center cover
15. Breather hose16. PCV hose
17. Connection for spark plug cables
l *
4*
NOTE4+ : Refer to “Service Points of Installation”.
WA0581
18.Rocker cover19.Semi-circular packing
20.Plug rubber2 1.Auto tensioner
22.Timing belt
23.Tensioner pulley
24.Tensioner arm
25.Idle oullev26. Camshaft sprocket
27. Oil pump sprocket
28. Crankshaft sprocket bolt
29. Special wastier
30. Crankshaft sprocket
31. Flange32. Tensioner
“B”33. Timing belt “B”
34. Silent shaft sprocket
35. Spacer36. Crankshaft sprocket “B”
37. Left engine support bracket
38. Timing belt rear right cover
39. Timing belt rear left cover (upper)
40. Timing belt rear left cover (lower)

9-96ENGINE <2.0L DOHC Engine> - Timing Belt
116
/18
Iv- IL 1’11117-9 ftlbs.
\43-49
Nm-_---. . .
30-42 Nm$0
22-30 ftlbs.
\
j2 \ 36
33
15-22 Nm
11-16 ftlbs.
I20-27 Nm\h \
14-20 f&.lbs.110-130 Nm cI,60-94 f
\z/OIAOS83-ama .I~..su--Du Nrnt Ibs .,iJ 36-43 ft.lbs.. .
Installation steps
40. Timing belt rear left cover (lower)
39. Timing belt rear left cover (upper)
38. Timing belt rear right cover37. Left engine support bracket
I)+ 36. Crankshaft sprocket “B”
l + 35. Spacer34. Silent shaft sprocket
l + 33. Timing belt “B”
l 4Adjustment of timing belt “B” tension
32. Tensioner “B”
l + 31. Flange++ 30. Crankshaft sprocket
29. Special washer
28. Crankshaft sprocket bolt
l + 27. Oil pump sprocketl + 26. Camshaft sprocket25. Idle pulley
e+ 21. Auto tensioner24. Tensioner arml 23. Tensioner pulleyl + 22. Timing belt
l 4Adjustment of timing belt tension20. Plug rubberl + 19. Semi-circular packingl 4 18. Rocker cover
17. Connection for spark plug cables16. PCV hose15. Breather hose14. Center cover
l + 13. Timing belt front lower covere+ 12. Timing belt front upper cover11. Crankshaft pulley10. Water pump pulley (power steering)
9. Water pump pulley
l +8. Drive belt (air conditioner)7. Tensioner pulley bracketI)+ 6. Drive belt (power steering)l +5. Drive belt (alternator)
4. Return pipe clamp bolt (power steering)3. Engine mount bracket
2. Bracket
1. Clamp for pressure hose (power steering)
NOTE+4 : Refer to “Service Points of Installation”.

ENGINE <2.0L DOHC Engine> - Timinn Belt
SpacerChahfered
6s
il seal
6EN009Silent shaft
nsprocketI
Timing
markCrankshaft
) ~sprocket “6”Center of
tensioner
pulley
Center of
installation bolt
installation bolt
-35. INSTALLATION OF SPACER
(1) Apply a thin coat of engine oil to the outer circumfer-
ence of the spacer.
(2) Install the spacer with the chamfered end facing the oil
seal.
NOTEIf the spacer is installed adversely, the oil seal may be
damaged, resulting in the oil leaks.
33. INSTALLATION OF TIMING BELT “B”
(1) Ensure that crankshaft sprocket “B” timing mark and
the silent shaft sprocket timing mark are aligned.
(2) Fit timing belt “B” over crankshaft sprocket “B” and
the silent shaft sprocket. Ensure that there is no slack inthe belt.
.ADJUSTMENT OF TIMING BELT “B” TENSION
(1) Temporarily fix the timing belt “B” tensioner such that
the center of the tensioner pulley is to the left and
above the center of the installation bolt, and temporarilyattach the tensioner pulley so that the flange is toward
the front of the engine.
(2) Holding the timing belt “B” tensioner up with your
finger in the direction of the arrow, place pressure on
the timing belt so that the tension side of the belt is
taut. Now tighten the bolt to fix the tensioner.
Caution
When tightening the bolt, ensure that the tensioner
pulley shaft does not rotate with the bolt. Allowing
it to rotate with the bolt can cause excessive
tension on the belt.
(3) To ensure that the tension is correct, depress the belt
(point A) with a finger. If not, adjust.
Standard value: 5-7 mm
(.20-.28 in.)

9-126ENGINE <2.0L DOHC Engine>- Front Case, Oil Pump and Silent Shaft
6EN0213
w Crank pulley side
Oil pan
from lower side
‘- Apply sealant7LUOOO0
6LUOO49 tBracket side
-----Be
\Apply oil9. INSTALLATION OF OIL PAN
(1) Clean both mating surfaces of oil pan and cylinder
+
block.
(2) Apply a 4 mm (.I 6 in.) wide bead of sealant to the entirecircumference of the oil pan flange.
Specified sealant:
MITSUBISHI GENUINE PART No.
MD9971 10 or
equivalent
(3) The oil pan should be installed in 15 minutes after the
application of sealant.
(4) Note the difference in bolt lengths at the location
shown.8. INSTALLATION OF OIL PRESSURE SWITCH
(1) Coat sealant on the thread area, and using the special
tool, install the pressure switch.
Specified sealant: MOPAR Part No.4318034
orequivalent
Caution
1. Do not let sealant ooze out of the top of the
thread area.
2. Do not overtighten the pressure switch.
(2) Install the oil pressure switch terminals.
5. INSTALLATION OF OIL COOLER
First insert the oil cooler projecting stopper in the oil filter
bracket groove and then tighten the oil cooler bolts.lu3. INSTALLATION OF OIL FILTER
Wipe clean the mounting surface on the filter bracket.
Then, apply a thin coat of engine oil to filter O-ring and
tighten the oil filter by hand.
Caution
-.Never use a wrench to tighten the oil filter.
-i
16LUO26