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Engine: Specifications Mercury Montego III

Mechanical ~185 words

GENERAL SPECIFICATIONS

ItemSpecification
Lubricants and Sealants
Motorcraft SAE 5W-20 Premium Synthetic Blend Motor Oil XO-5W20-QSP (in Canada Motorcraft SAE 5W-20 Super Premium Motor Oil CXO-5W20-LSP12) or equivalentWSS-M2C930-A
Silicone Gasket Remover ZC-30
Motorcraft Metal Surface Prep ZC-31
Silicone Gasket and Sealant TA-30WSE-M4G323-A4
Silicone Brake Caliper Grease and Dielectric Compound XG-3-AESE-M1C171-A
Motorcraft Metal Surface Cleaner ZC-21WSE-M5B392-A
Threadlock and Sealer TA-25WSK-M2G351-A5
Engine
Displacement3.0L (4V) (182 CID)
Number of cylinders6
Bore89.0 mm (3.50 in)
Stroke79.5 mm (3.13 in)
Firing order1-4-2-5-3-6
Oil pressure (minimum at 1,500 RPM with engine warmed up after 10 minutes of idling.)76kPa(11 psi)
Oil capacity (1)5.7 L (6.0 qts)
Compression ratio10:1
Cylinder Head and Valve Train
Cylinder head distortion (2)
Combustion chamber volume52 cc (3.17 CI)
Valve arrangement (front to rear)LH intake I-I-I-I-I-I, LH exhaust E-E-E-E-E-E, RH intake I-I-I-I-I-I, RH exhaust E-E-E-E-E-E
Valve guide bore diameter6.015-6.044 mm (0.236-0.237 in)
Valve stem diameter - intake5.975-5.995 mm (0.2350-0.2358 in)
Valve stem diameter - exhaust5.950-5.970 mm (0.2343-0.2350 in)
Valve stem-to-guide clearance - intake0.019-0.069 mm (0.0007-0.0027 in)
Valve stem-to-guide clearance - exhaust0.046-0.095 mm (0.0018-0.0037 in)
Valve head diameter - intake35 mm (1.38 in)
Valve head diameter - exhaust30 mm (1.18 in)
Valve head diameter (intake) - gauge diameter33.5 mm (1.3189 in)
Valve head diameter (exhaust) - gauge diameter28.0 mm (1.10236 in)
Valve face runout0.04 mm (0.001 in)
Valve face angle45.25-45.75 degrees
Valve seat width - intake1.1-1.4 mm (0.043-0.055 in)
Valve seat width - exhaust1.4-1.7 mm (0.055-0.066 in)
Valve seat runout0.04 mm (0.001 in)
Valve seat angle44.5-45.0 degrees
Valve spring free length (approx.)46.6 mm (1.84 in)
Valve spring squareness2.5%
Valve spring compression pressure (N @ spec, length)693 N @ 30.09 mm (156 lbs @ 1.18 in)
Valve spring installed height (N @ spec, length)39.89 mm +/-0.2 mm (1.57 in +/- 0.0078 in)
Valve spring installed pressure240 N +/- 12 N@ 39.89 mm (53.95 lbs +/- 2.69 lbs@ 1.57 in)
Valve spring installed pressure - service limit10% force loss @ specified height
Roller follower ratio @ max. lift2.0:1
Hydraulic Lash Adjuster
Diameter (standard)16-15.988 mm (0.6290-0.6294 in)
Clearance-to-bore0.018-0.069 mm (0.0007-0.0027 in)
Hydraulic leakdown rate5-25 seconds
Collapsed lash adjuster gap0.50-1.11 mm (0.019-0.043 in)
Camshaft
Theoretical valve lift @ 0 lash9.80 mm (0.388 in)
Lobe lift-intake4.29 mm (0.16 in)
Lobe lift-exhaust4.68 mm (0.18 in)
Allowable lobe lift loss0.76 mm (0.003 in)
Journal diameter (all)26.962-26.936 mm (1.061-1.060 in)
Camshaft journal bore inside diameter27.012-26.987 mm (1.063-1.062 in)
Camshaft journal-to-bearing clearance - standard0.028-0.074 mm (0.001-0.0029 in)
Camshaft journal-to-bearing clearance - service limit0.121 mm (0.0047 in)
Runout
End play - service limit0.025-0.165 mm (0.0009-0.0064 in)
Cylinder Block
Cylinder bore diameter - grade 189.000-89.010 mm (3.5039-3.5043 in)
Cylinder bore diameter - grade 289.011-89.020 mm (3.5043-3.5047) in)
Cylinder bore diameter - grade 389.021-89.030 mm (3.5047-3.5051 in)
Cylinder bore maximum taper0.020 mm (0.008 in)
Cylinder bore maximum out-of-round0.015 mm (0.0005 in)
Cylinder bore maximum out-of-round - service limit0.020 mm (0.0007 in)
Main bearing bore inside diameter67.998-68.022 mm (2.677-2.678 in)
Head gasket surface flatness
Crankshaft
Main bearing journal diameter62.968-62.992 mm (2.479-2.480 in)
Main bearing journal maximum taper0.008 mm (0.0003 in)
Main bearing journal maximum out-of-round0.006 mm (0.0082 in)
Main bearing journal-to-cylinder block clearance0.026 mm-0.042 mm (0.0010-0.0016 in)
Connecting rod journal diameter49.969-49.991 mm (1.967-1.968 in)
Connecting rod journal maximum taper0.008 mm (0.0003 in)
Connecting rod journal maximum out-of-round0.006 mm (0.0002 in)
Crankshaft maximum end play0.135-0.255 mm (0.005-0.010 in)
Piston and Connecting Rod
Piston diameter - coated, grade 188.990-89.010 mm (3.5035-3.5043 in)
Piston diameter - coated, grade 288.998-89.022 mm (3.5039-3.5048 in)
Piston diameter - coated, grade 389.010-89.030 mm (3.5043-3.5051 in)
Piston diameter - uncoated, grade 188.970-88.980 mm (3.5027-3.5031 in)
Piston diameter - uncoated, grade 288.978-88.992 mm (3.5030-3.5036 in)
Piston diameter - uncoated, grade 388.990-89.000 mm (3.5035-3.5039 in)
Piston-to-cylinder bore clearance - uncoated0.018 to 0.042 mm (0.0007-0.0016 in)
Piston ring end gap - compression (top, gauge diameter) (3)0.100-0.250 mm (0.0039-0.0098 in)
Piston ring end gap - compression (bottom, gauge diameter)0.27-0.42 mm (0.0106-0.0165 in)
Piston ring end gap - oil ring (steel rail, gauge diameter)0.15-0.65 mm (0.0059-0.0255 in)
Piston ring end gap - compression (top, service limit)0.50 mm max. (0.0196 in)
Piston ring end gap - compression (bottom, service limit)0.65 mm max. (0.0255 in)
Piston ring end gap - oil ring (steel rail, service limit)0.90 mm max. (0.0354 in)
Piston ring groove width - compression (top)1.230-1.245 mm (0.0484-0.0490 in)
Piston ring groove width - compression (bottom)1.530-1.545 mm (0.0602-0.0608 in)
Piston ring groove width - oil ring2.530-2.555 mm (0.0996-0.1005 in)
Piston ring width
Piston ring-to-groove clearance
Piston pin bore diameter21.015-21.020 mm (0.8273-0.8275 in)
Piston pin diameter21.011-21.013 mm (0.8271-0.8273 in)
Piston pin length60.51-60.08 mm (2.382-2.365 in)
Piston pin-to-piston fit0.002 to 0.009 mm (0.00007-0.00003 in)
Piston-to-connecting rod clearance
Connecting rod-to-pin clearance - standard0.004-0.0201 mm (0.0001-0.0008 in)
Connecting rod-to-pin clearance - service limit0.035 mm (0.0013 in)
Connecting rod pin bore diameter21.017-21.031 mm (0.827-0.828 in)
Connecting rod length (center-to-center)138.06-138.14 mm (5.435-5.438 in)
Connecting rod maximum allowed bend0.038 mm (0.0015 in) per 25 mm (0.984 in)
Connecting rod maximum allowed twist0.050 mm (0.0019 in) per 25 mm (0.984 in)
Connecting rod bearing bore diameter53.015-53.035 mm (2.0872-2.0879 in)
Connecting rod bearing-to-crankshaft clearance0.028-0.066 mm (0.001-0.0025 in)
Connecting rod side clearance0.100-0.30 mm (0.0039-0.0118 in)
(1) With filter change. (2) Refer to the procedure for specifications. (3) Specification 82.4 mm (3.2441 in) diameter gauge.
(1)With filter change.
(2)Refer to the procedure for specifications.
(3)Specification 82.4 mm (3.2441 in) diameter gauge.

GENERAL SPECIFICATIONS

TORQUE SPECIFICATIONS

DescriptionNmLb-ftLb-in
Accessory drive belt tensioner bolt4533
Air conditioning compressor bolts and nuts2518
Air conditioning compressor bracket bolts2518
Battery B+ nut544
Block heater1410
Camshaft journal cap bolts1089
Camshaft oil seal retainer bolts1089
Camshaft position (CMP) sensor bolt1089
Coolant bypass tube bolts1089
Coolant pump bolts (1)
Crankshaft position (CKP) sensor bolt1089
Crankshaft damper bolt (1)
Crankcase vent cover bolts1089
Cylinder head bolts (1)
Driveshaft bolts2518
Exhaust gas recirculation (EGR) system module bolts2518
EGR system module tube nuts4030
Engine front cover bolts and stud (1)
Engine support insulator nuts7052
Exhaust manifold heat shield bolts118
Exhaust manifold nuts2015
Exhaust manifold stud129
Exhaust manifold-to-catalytic converter bolts4030
Flexplate bolts8059
Front transaxle stabilizer mount nut and bolt4030
Fuel rail bolts1089
Generator bolts and nuts4835
Generator-to-engine front cover studs871
Generator B+ terminal nut (W705790-S901)871
Ground strap bolts1089
Ground cable-to-transaxle housing bolt129
Halfshaft support bracket bolts4835
Ignition coil-on-plug bolts653
Intermediate shaft-to-steering gear bolt (N808349-S439)2317
Knock sensor (KS) bolt2015
Oil filter adapter bolts (1)
Oil filter1612
Oil level indicator and tube stud bolt980
Oil pan baffle nuts (1)
Oil pan bolts2518
Oil pan drain plug2619
Oil pan-to-transaxle bolts4030
Oil pressure sender1410
Oil pump bolts1089
Oil pump screen and pickup tube bolts1089
Outer tie-rod end nuts9066
Power steering fluid reservoir nuts980
Power steering fluid reservoir bracket nut980
Power steering pump nuts2518
Power steering pump bracket bolts2518
Power steering pressure (PSP) tube bracket-to-cylinder head bolts762
PSP tube bracket-to-fluid reservoir bracket bolt762
PSP tube bracket-to-crossmember bolt2518
Power steering tube-to-steering gear bolt2518
Radio ignition interference capacitor bolt871
Rear transaxle mount bracket-to- transaxle bolts (2)5541
RH engine support insulator bracket bolts5541
RH valve cover-to power steering fluid reservoir stud bolts762
Shifter cable bracket bolts2518
Spark plugs1511
Stabilizer bar link nuts5541
Starter motor ground cable bolt2518
Starter cable positive nut129
Thermostat housing-to-coolant pump bolts1089
Timing chain guide bolts2518
Timing chain tensioner bolts2518
Torque converter-to-flexplate nuts3627
Transaxle-to-engine bolts4030
Transaxle roll restrictor cross brace-to-body bolts (2)5541
Transaxle roll restrictor cross brace-to-roll restrictor bolt (2)4835
Transaxle roll restrictor bracket-to-roll restrictor bolts (2)5541
Transaxle roll restrictor-to-transaxle bolts (2)5541
Upper and lower intake manifold bolts1089
Valve cover bolts and stud bolts1089
Wiring harness shield-to-valve cover stud bolt nuts653
(1) Refer to the procedure below. (2) When reinstalling fasteners originally coated with threadlock, clean with a wire brush prior to applying new threadlock. Apply threadlock to the threads of the bolt(s).
(1)Refer to the procedure below.
(2)When reinstalling fasteners originally coated with threadlock, clean with a wire brush prior to applying new threadlock. Apply threadlock to the threads of the bolt(s).

TORQUE SPECIFICATIONS

WARNINGThe 3.0L Duratec engine is equipped with a composite intake manifold and fabricated exhaust manifolds. The engine should not be supported by these manifolds during repair procedures. Failure to follow these instructions can result in personal injury.

The 3.0L Duratec is a 4-valve-per-cylinder, dual overhead camshaft engine. The engine uses a distributorless ignition system. The cylinder block is a 2-piece design with the upper portion housing the cylinders, and a separate lower cylinder block containing the main bearing caps. Both sections are made of aluminum, with inserts for the bearing areas and caps. An aluminum oil pan bolts to the bottom of the lower cylinder block and to the transaxle to provide greater strength.

The camshafts are mounted in the cylinder heads and act against a roller follower to open and close the valves. A hydraulic lash adjuster is located on one side of the roller follower and the valve tip on the opposite end. The camshafts are driven off the front of each cylinder head by 2 chains (one each side). Both of the chains are driven by sprockets that are located on the crankshaft, just in front of the oil pump.

Refer to ENGINE SYSTEM-GENERAL INFORMATION for basic mechanical concerns.

Refer to the INTRODUCTION - GASOLINE article for driveability concerns.

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