Document ID: 3745810

Engine Mechanical Specifications (LFX)

Engine Mechanical Specifications (LFX)
Application	Specification
Application	Metric	English
General
Engine Type	V-6
Displacement	3.6 Liter	220 cu in
RPO	LFX
VIN	3
Bore	94 mm	3.7008 in
Stroke	85.6 mm	3.37 in
Compression Ratio	11.5:1
Firing Order	1-2-3-4-5-6
Spark Plug Gap	0.95–1.10 mm	0.0375–0.0433 in
Block
Crankshaft Main Bearing Bore Diameter	72.867–72.881 mm	2.8688–2.8693 in
Cylinder Bore Diameter	93.992–94.008 mm	3.7005–3.7011 in
Cylinder Bore Out-of-Round – Production Max.	0.026 mm	0.001 in
Cylinder Bore Taper	0.020 mm	0.0008 in
Camshaft
Camshaft Bearing Inside Diameter – Front Number 1	35.000–35.020 mm	1.3779–1.3787 in
Camshaft Bearing Inside Diameter – Middle and Rear Number 2–4	27.000–27.020 mm	1.0630–1.0638 in
Camshaft End Play	0.072–0.490 mm	0.0028–0.0190 in
Camshaft Journal Diameter – Front Number 1	34.936–34.960 mm	1.3754–1.3764 in
Camshaft Journal Diameter – Middle and Rear Number 2–4	26.936–26.960 mm	1.0605–1.0614 in
Camshaft Journal Out-of-Round	0.006 mm	0.0002 in
Camshaft Journal to Bore Clearance	0.040–0.084 mm	0.0016–0.0033 in
Camshaft Lobe Lift – Exhaust	42.425–42.725 mm	1.6703–1.6821 in
Camshaft Lobe Lift – Intake	42.385–42.685 mm	1.6687–1.6805 in
Camshaft Runout – Front and Rear Number 1 and 4	0.025 mm	0.0010 in
Camshaft Runout – Middle 2 and 3	0.050 mm	0.0020 in
Valve Lift – Exhaust	10.8 mm	0.4252 in
Valve Lift – Intake	10.8 mm	0.4252 in
Connecting Rod
Connecting Rod Bearing Clearance	0.010–0.070 mm	0.0004–0.0026 in
Connecting Rod Bore Diameter – Bearing End	59.620–59.636 mm	2.3472–2.3479 in
Connecting Rod Bore Diameter – Pin End – Production	24.009–24.019 mm	0.9452–0.9456 in
Connecting Rod Bore Diameter – Pin End – Service Maximum	24.021 mm	0.9457 in
Connecting Rod Length – Center to Center	152.400 mm	6.0000 in
Connecting Rod Side Clearance	0.095–0.355 mm	0.00037–0.0140 in
Connecting Rod Width – Bearing End
Production	21.775 mm	0.8573 in
Service	21.725–21.825 mm	0.8553–0.8593 in
Connecting Rod Width – Pin End
Production	21.775 mm	0.8573 in
Service	21.725–21.825 mm	0.8553–0.8593 in
Crankshaft
Connecting Rod Journal Diameter	55.992–56.008 mm	2.2044–2.2050 in
Connecting Rod Journal Out-of-Round	0.005 mm	0.0002 in
Connecting Rod Journal Taper	0.005 mm	0.0002 in
Connecting Rod Journal Width
Production	22.000 mm	0.8661 in
Service	21.920–22.080 mm	0.8630–0.8693 in
Crankshaft End Play	0.100–0.330 mm	0.0039–0.0130 in
Crankshaft Main Bearing Clearance	0.031–0.069 mm	0.0012–0.0027 in
Crankshaft Main Journal Diameter	67.992–68.008 mm	2.6768–2.6775 in
Crankshaft Main Journal Out-of-Round	0.005 mm	0.0002 in
Crankshaft Main Journal Taper	0.005 mm	0.0002 in
Crankshaft Main Journal Thrust Wall
Runout	0.000–0.040 mm	0.0000–0.0016 in
Square	0.000–0.010 mm	0.0000–0.0004 in
Crankshaft Main Journal Width, #2, 4
Production	24.000 mm	0.9449 in
Service	23.900–24.100 mm	0.9409–0.9488 in
Crankshaft Main Journal Width, #3
Production	24.400 mm	0.9606 in
Service	24.360–24.440 mm	0.9591–0.9622 in
Crankshaft Pilot Bearing Bore Diameter	20.965–20.995 mm	0.8254–0.8266 in
Crankshaft Rear Flange Runout	0.025 mm	0.0010 in
Crankshaft Reluctor Ring Runout – Maximum	1.500 mm	0.0591 in
Crankshaft Runout	0.030 mm	0.0012 in
Crankshaft Thrust Bearing Clearance	0.076–0.305 mm	0.0030–0.0120 in
Crankshaft Thrust Surface – Height Diameter	95.000 mm	3.7401 in
Crankshaft Thrust Surface Runout	0.040 mm	0.0016 in
Cylinder Head
Valve Guide Bore – Exhaust	6.000–6.020 mm	0.2362–0.2370 in
Valve Guide Bore – Intake	6.000–6.020 mm	0.2362–0.2370 in
Valve Guide Installed Height	14.050–14.550 mm	0.5531–0.5728 in
Valve Lifter Bore Diameter	12.008–12.030 mm	0.4728–0.4736 in
Lubrication System
Oil Pressure – Minimum @ Idle	69 kPa	10 psi
Oil Pressure – Minimum @ 2,000 RPM	138 kPa	20 psi
Piston Cooling Jet Valve Opening Pressure	1.7–2.3 bar	25–33 psi
Piston Rings
Piston Ring End Gap
First Compression Ring – Nominal	0.150–0.250 mm	0.0059–0.0098 in
First Compression Ring – Maximum, Ring in Bore	0.290 mm	0.0114 in
Second Compression Ring – Nominal	0.300–0.450 mm	0.0118–0.0177 in
Second Compression Ring – Maximum, Ring in Bore	0.490 mm	0.0193 in
Oil Control Ring	0.150–0.350 mm	0.0059–0.0138 in
Piston Ring to Groove Clearance
First Compression Ring	0.030–0.075 mm	0.0012–0.0030 in
Second Compression Ring	0.015–0.060 mm	0.0006–0.0024 in
Oil Control Ring	0.030–0.170 mm	0.0012–0.0067 in
Piston Ring Thickness
First Compression Ring	0.975–0.990 mm	0.0384–0.0390 in
Second Compression Ring	1.170–1.195 mm	0.0461–0.0470 in
Oil Control Ring	1.360–1.480 mm	0.0535–0.0583 in
Pistons and Pins
Piston
Piston Diameter – Measured Over Skirt Coating	93.976–94.014 mm	3.6998–3.7013 in
Piston Diameter – Service Limit Minimum w/more than 10K miles	93.926 mm	3.6979 in
Piston Pin Bore Diameter	24.004–24.009 mm	0.9450–0.9452 in
Piston Ring Groove Width – First Compression Ring	1.020–1.050 mm	0.0402–0.0413 in
Piston Ring Groove Width − Second Compression Ring	1.210–1.230 mm	0.0476–0.0484 in
Piston Ring Groove Width – Oil Control Ring	1.510–1.530 mm	0.0594–0.0602 in
Piston to Bore Clearance – Production; Measured at Skirt Coating	0.022–0.032 mm	0.0009–0.0013 in
Piston to Bore Clearance – Service Limit Maximum, w/more than 10k miles	0.050 mm	0.0020 in
Pin
Piston Pin Clearance to Connecting Rod Bore – Production	0.009–0.022 mm	0.0004–0.0009 in
Piston Pin Clearance to Connecting Rod Bore – Service Maximum	0.030 mm	0.0012 in
Piston Pin Clearance to Piston Pin Bore – Production	0.004–0.012 mm	0.0002–0.0005 in
Piston Pin Clearance to Piston Pin Bore – Service Maximum	0.015 mm	0.0006 in
Piston Pin Diameter	23.997–24.000 mm	0.9448–0.9449 in
Piston Pin Length	52.600–53.100 mm	2.0709–2.0906 in
Valve System
Valves
Valve Face Angle	44.25 degrees
Valve Face Runout	0.0500 mm	0.0020 in
Valve Face Width – Exhaust	DO NOT GRIND, REPLACE VALVE	DO NOT GRIND, REPLACE VALVE
Valve Face Width – Intake	DO NOT GRIND, REPLACE VALVE	DO NOT GRIND, REPLACE VALVE
Valve Head Diameter – Exhaust	30.470–30.730 mm	1.1996–1.2098 in
Valve Head Diameter – Intake	38.170–38.430 mm	1.5028–1.5130 in
Valve Installed Height	35.23–36.69 mm	1.3870–1.4445 in
Valve Length – Exhaust	95.11 mm	3.74 in
Valve Length – Intake	100.630 mm	3.9618 in
Valve Seat Angle – Seating Surface	45 degrees
Valve Seat Angle – Relief Surface	30 degrees
Valve Seat Angle – Undercut Surface	60 degrees
Valve Seat Roundness– Maximum	0.025 mm	0.0010 in
Valve Seat Runout – Maximum	0.080 mm	0.0031 in
Valve Seat Width – Exhaust Seating Surface	1.400–1.800 mm	0.0551–0.0709 in
Valve Seat Width – Exhaust Relief Surface	0.700–0.900 mm	0.0276–0.0354 in
Valve Seat Width – Intake Seating Surface	1.000–1.400 mm	0.0394–0.0551 in
Valve Seat Width – Intake Relief Surface	0.500–0.700 mm	0.0197–0.0276 in
Valve Stem Diameter – Exhaust	5.945–5.965 mm	0.2341–0.2348 in
Valve Stem Diameter – Intake	5.945–5.965 mm	0.2341–0.2348 in
Valve Stem-to-Guide Clearance – Exhaust	0.035–0.075 mm	0.0014–0.0030 in
Valve Stem-to-Guide Clearance – Intake	0.035–0.075 mm	0.0014–0.0030 in
Valve Lifters – Stationary Hydraulic Lash Adjuster (SHLA)
Valve Lifter (SHLA) Diameter	11.989–12.000 mm	0.4720–0.4724 in
Valve Lifter (SHLA)-to-Bore Clearance	0.008–0.041 mm	0.0003–0.0016 in
Rocker Arms
Valve Rocker Arm Ratio	1.68 to 1
Valve Rocker Arm Roller Diameter	17.750–17.800 mm	0.6988–0.7008 in
Valve Springs
Valve Spring Coil Thickness	3.250 x 3.900 mm	0.1280 x 0.1535 in
Valve Spring Diameter – Inside Top	12.200–12.700 mm	0.4803–0.5000 in
Valve Spring Diameter – Outside Top	20.250 mm	0.7972 in
Valve Spring Diameter – Inside Bottom	17.950–18.450 mm	0.7067–0.7264 in
Valve Spring Diameter – Outside Bottom	26.000 mm	1.0236 in
Valve Spring Free Length	42.500–45.500 mm	1.6732–1.7913 in
Valve Spring Installed Height – Closed	35.000 mm	1.3779 in
Valve Spring Installed Height – Open	24.000 mm	0.9449 in
Valve Spring Load – Closed	247–273 N	56–61 lb
Valve Spring Load – Open	598–662 N	134–149 lb