1974 Mustang Engine Information & Specs – 140 Lima Inline 4 Engine (2.3 L)

140 Inline 4 Technical Specs & Data

1974 Mustang Engine Information – 140 cubic inch I4 (2.3 L Lima Inline 4)

The Lima Inline 4 Engine

The 140 ci engine was used from 1974 to 1979, it was then renamed a 2.3 liter engine and was used from 1979 to 1993 when it was dropped at year end. It has not been revived since (up to 2015). Specifications change from year to year, so use the appropriate years engine specs if you are rebuilding or working on an engine.

Engine Basics

Year 1974
Cylinders 4
Displacement 140 cu / 2.3 liters
Power (hp) 88 hp @ 5,000 RPM
Torque (lb/ft) 116 lb/ft @ 2,600 RPM
Compression 8.4:1
Bore x Stroke 3.781 x 3.126

2.3 liter engine 140 Cubic Inch Firing Order

Firing Order Inline 4 140

  • 2.3 liter engine 140 ci
  • Firing Order: 1-3-4-2
  • Cylinders front to rear: 1, 2, 3, 4
  • Valve order in head front to rear: I-E-I-E-I-E-I-E
  • Cylinder compression pressure: 101 PSI minimum
  • 1983 & 1984 Oil pressure at 2500 rpm and warm: 55-60 PSI
  • 1985 Oil pressure at 2500 rpm and warm: 40-60 PSI
  • Spark plugs: AWSF42-C @0.044″
  • Spark plugs turbo model: AWSF32C @0.034″
  • Thermostat starts to open: 193-200 degrees
  • Thermostat fully open: 221 degrees
  • Radiator cap pressure: 16
  • Cylinder head warp limit: .007 “

Engine & Other Torque Specifications

All torque specifications provided in this table are those recommended by FORD. If you use special bolts, follow the torque specifications provided by the manufacturer. I recommend that you use the 3 step torque technique where you torque down the bolts in three equal steps. Once you have reached the maximum recommended torque setting, go around one more time. Do not torque in a circular pattern. Always torque cross to cross.

Cylinder head bolts 50-60 then 80-90
Flywheel bolts 56-64
Intake manifold bolts 1979- 1986 5-7 then 14-21
Intake manifold bolts 1987-1988 15-22
Intake manifold bolts 1989 & on 20-29
Exhaust manifold bolts 1979- 1986 60-84 in lbs, then 16-23
Exhaust manifold bolts 1987 – 1990 16-18, then 20-30
Exhaust manifold bolts 1991 on Regular bolts 15-17, then 20-30
Exhaust manifold bolts 1991 on Stud type bolts 20-33
Heat shield nuts 20-29
Oil pan to engine block bolts 1979 – 1986 small bolts 72-96 in lbs
Oil pan to engine block bolts 1979 – 1986 large bolts 96-120 in-lbs
Oil pan to engine block bolts 1987-1990, 1992-1993 120-160 in lbs
Oil pan to engine block bolts 1991 120-144
Oil pan to transmission bolts 1991 30-36, then 30-39
Camshaft sprocket bolt 50-71
Crankshaft pulley to sprocket bolt 1979-1986 100-120
Crankshaft pulley to sprocket bolt 1987-1990 103-133
Crankshaft pulley to sprocket bolt 1991-1993 114-151
Camshaft retaining plate bolt 6-9
Auxillary shaft sprocket bolt 28-40
Timing belt cover bolts 6-9
Timing belt tensioner adj. screw 14-21
timing belt tensioner pivot bolt & camshaft cover shield bolt 28-40
neutral start switch C3 1979-1981 12-15
neutral start switch C3 1982 – 1986 7-10
neutral start switch C4 6-8
neutral start switch C5 55-75 “/lbs
neutral start switch C3 1982 – 1986 84-120 “/lbs
neutral start switch AOD 8-11 lbs
Auto transmission pan bolts C3 12-17
Auto transmission pan bolts C4 & C5 12-16
Auto transmission pan bolts A4LD 8-10
Auto transmission pan bolts AOD
Engine mount to block bolts 1979 – 1981 35-60
Engine mount to block bolts 1982 40-55
Engine mount to block bolts 1983-1987 33-45
Engine mount to block bolts 1988 on except convert. 33-45
Engine mount to block bolts 1988 on convertible. 25-35
Engine mount to frame nuts & bolts 1979-1981 40-60
Engine mount to frame nuts & bolts 1982 70-90
Engine mount to frame nuts & bolts 1983 57-65
Engine mount to frame nuts & bolts 1984 50-65
Engine mount to frame nuts & bolts 1985 80-106
Engine mount to frame nuts & bolts 1985 turbo bolt 33-45
Engine mount to frame nuts & bolts 1985 turbo nut 50-65
Engine mount to frame nuts & bolts 1986 45-55
Engine mount to frame nuts & bolts 1987 on bolt 45-63
Engine mount to frame nuts & bolts 1987 on nut 80-106
Engine mount to bracket bolts 1985 65-85
Carb to intake 2150 2V 14-16
Carb to intake model 7200 VV 12-15
Carb to intake 4180-C 4V 14-20
Driveshaft flange bolts 70-95
Pedal support brake bracket 13-25
Clutch self adjuster bolt 17-26
Wheel lug nuts 80-105
Front hub nut 17-25, back off then to 10-15 lbs

Valve information

Minimum valve margin width 1/32″
Intake & exhaust valve seat angle 45 degrees
Intake & exhaust valve face angle 44 degrees
Intake valve seat width 0.060-0.080
Intake & exhaust valve face runout limit 0.0016″
exhaust valve seat width 0.070 – 0.090
Intake & exhaust valve seat runout limit 0.003
Intake stem diameter Standard 0.3416-0.3423
Intake stem diameter – 0.015 oversized 0.3566-0.3573
Intake stem diameter – 0.030 oversized 0.3376-0.3723
Exhaust stem diameter – standard 0.3411-0.3418
Exhaust stem diameter – 0.015 oversized 0.3561-0.3568
Exhaust stem diameter – 0.030 oversized 0.3711-0.3718
Intake valve stem to guide clearance 0.0010-0.0027
Exhaust valve stem to guide clearance 0.0015-0.0032
Int % Exh valve stem to guide clearance svc. limit 0.0055
Valve spring out of square limit 5/16″
1979-1983 Valve spring pressure, valve open 71-79 lbs @1.56″
1984 & up Valve spring pressure, valve open 71-79 lbs @ 1.52″
1979-1982 Valve spring pressure, service limit 10% loss
1983-on Valve spring pressure, service limit 5% loss”
Installed height 1 17/32 – 1 19/32
Hydraulic valve lash adjuster diameter 0.8422 – 0.8427
Hydraulic valve lash clearance in borer 0.0007 – 0.0027
Service limit 0.005″

Crankshaft Specifications

Connecting rod journal diameter 1979 2.0464-2.0472″
Connecting rod journal diameter 1980-1982 2.0462-2.0472″
Connecting rod journal diameter 1983-on 2.0465-2.0472″
Connecting rod journal out-of-round 0.0006″
Connecting rod journal taper limit 0.0006″
Connecting rod Bearing oil clearance desired 0.0008-0.0015″
Connecting rod Bearing oil clearance allowed 0.0008-0.0026″
Connecting rod side clearance std. 0.0035-0.0105″
Connecting rod side clearance allowed 0.014
Main Bearing journal diameter 1979 – 1990 2.399-2.3982″
Main Bearing journal diameter 1991 on 2.2059-2.2051
Main Bearing journal taper limit 0.0006″
Main Bearing journal runout limit 1979 – 1990 2.399-2.3982
Main Bearing journal runout limit 1991 & up 2.2059-2.2051
Main bearing taper limit 0.0006″ per inch
Main Bearing journal runout limit 1979-1990 0.005″
Main Bearing journal runout limit 1991 & up 0.002
Main Bearing journal oil clearance desired 0.0008-0.0015″
Main Bearing journal oil clearance allowed 0.0008-0.0026″
Crankshaft endplay 0.004-0.008″
Crankshaft endplay service limit 0.012″
Cylinder bore diameter 3.7795″
Cylinder bore out-ofround limit 0.005″
Cylinder bore taper limit 0.010″
1979 Piston diameter coded red 3.7780-3.7786″
1979 Piston diameter coded blue 3.7792-37798″
1980-1982 Turbo Piston diameter coded red 3.7760-3.7766″
1980-1982 Turbo Piston diameter coded blue 3.7772-3.7778″
1980-1982 non-Turbo Piston diameter coded red 3.7780-3.7786″
1980-1982 non-Turbo Piston diameter coded blue 3.7792-3.7798″
1983 on Piston diameter red 3.7764-3.7770″
1983 on Piston diameter blue 3.7776-3.7782″
1979-1982 piston to bore clearance limit Turbo 0.0034-0.0042″
1979-1982 piston to bore clearance limit non-Turbo 0.0014-0.0022″
1983-1990 piston to bore clearance limit 0.0033-0.0038″
1991 piston to bore clearance limit 0.0024-0.0038″
1992 and uppiston to bore clearance limit 0.0018-0.0029″
Piston ring end gap compression rings 1979-1991 top & bottom 0.010-0.020″
1992 Piston ring end gap compression rings -top ring 0.010-0.020″
1992 Piston ring end gap compression rings -bottom ring 0.015-0.025″
Piston ring end gap oil ring 0.015-0.055″
Piston ring side clearance, compression rings 1979-1990 std. 0.002-0.004″
Piston ring side clearance, compression rings 1991 & up. 0.016-0.0033″
Piston ring side clearance service limit 0.006″
Oil ring snug fit
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