Engine Mechanical Specifications. Cadillac Concours 1997

For 1990-2009 cars only

Makes 🢒 Cadillac 🢒 1997 🢒 Concours 🢒 Engine 🢒 Engine Mechanical - 4.0L and 4.6L 🢒 Engine Mechanical Specifications

Application	Metric	English
General
VIN ID	RPO LD8-Y RPO L37-9
Piston Displacement	4.6 Liter	279 cu in
Compression Ratio	10.3:1
Compression Pressure at Cranking Speed (Throttle Open)	965-1172 KPa	140-170 psi
Horsepower (RPO LD8)	205 kW @ 5600 RPM	275 hp @ 5600 RPM
Horsepower (RPO L37)	224 kW @ 6000 RPM	300 hp @ 6000 RPM
Torque (RPO LD8)	407 N·m @ 4000 RPM	300 lb ft @ 4000 RPM
Torque (RPO L37)	400 N·m @ 4400 RPM	295 lb ft @ 4400 RPM
Firing Order	1-2-7-3-4-5-6-8
Cylinder Block
Material	Aluminum with Cast-in Grey Iron sleeves
Bore	92.992-93.008 mm @ 41 mm below deck surface	3.6611-3.6617 in @ 1.614 in below deck surface
Stroke	84 mm	3.31 in
Deck Height	224.55 mm	8.84 in
Deck Clearance	0.45 mm above deck surface	0.18 in above deck surface
Length	528.45 mm	20.81 in
Piston Clearance @ 41 mm below deck face	0.020-0.051 mm	0.0008-0.0020 in
Deck Face Flatness -- Maximum Allowed	0.101 mm	0.004 in
Cylinder Bore Out-of-Round -- Maximum	0.100 mm	0.004 in
Cylinder Bore Taper -- Maximum	0.100 mm	0.004 in
Cylinder Head
Type	DOHC -- 4 Valves Per Cylinder
Material	Aluminum
Combustion Chamber Volume	51.8 cc	--
Cylinder Head Flatness Maximum Without Resurfacing	0.05 mm	0.002 in
Worn Limit	0.20 mm	0.008 in
Valves
Clearance Between Stem and Guide, New Limits -- Intake	0.028-0.068 mm	0.001-0.003 in
Clearance Between Stem and Guide, New Limits -- Exhaust	0.05-0.10 mm	0.002-0.004 in
Worn Limits, Not Over	0.12 mm	0.005 in
Head Diameter, Overall -- Intake	33 mm	1.30 in
Exhaust	29 mm	1.14 in
Valve Face Angle	45 degrees
Valve Seat Angle (In Head)	46 degrees
Valve Seat Width -- Intake	0.450-0.650 mm	0.017-0.033 in
Valve Seat Width -- Exhaust	0.700-1.100 mm	0.027-0.043 in
Seat Eccentricity, Not Over (T.I.R.)	0.05 mm	0.002 in
Valve Face Runout	0.05 mm	0.002 in
Stem Diameter	5.9207-5.9411 mm	0.2331-0.2339 in
Valve Guide Diameter (in Head)	5.979 mm	0.235 in
Valve Length -- Intake	105.89 mm	4.169 in
Valve Length -- Exhaust	90.53 mm	3.564 in
Valve Lifters
Type	Direct Acting, Hydraulic
Diameter	32.959-32.975 mm	1.297-1.298 in
Lifter Bore Diameter (In Head)	33 mm	--
Clearance	0.025-0.076 mm	0.001-0.003 in
Free Length	40.4 mm	1.591 in
RPO LD8
Force required to compress (Valve Closed)	205 N @ 30.3 mm	46 lb @ 1.19 in
Force required to compress (Valve Open)	409 N @ 21.7 mm	92 lb @ 0.854 in
RPO L37
Force required to compress (Valve Closed)	236 N @ 30.3 mm	53 lb @ 1.19 in
Force required to compress (Valve Open)	485 N @ 20.9 mm	109 lb @ 0.823 in
Installed Height	30.3 mm	1.19 in
Camshaft
Primary Drive Type	Endless Chain
Adjustment	Hydraulic, Automatic
Pitch	8 mm	0.315 in
Width	Single Row
Secondary Drive Type	Endless Chain
Adjustment	Direct Acting Hydraulic
Pitch	8 mm	0.315 in
Width	Single Row
Camshaft Material	Hardened Cast Grey Iron
Bearing Number	5
Bearing Number on Left Hand Intake	6
Bearing Journal Diameter	26.948-26.972 mm	1.061-1.062 in
Bearing Bore Diameter (In Head)	27.023 mm	1.064 in
Bearing Clearance	0.051-0.076 mm	0.002-0.003 in
New Limits	0.04-0.09 mm	0.002-0.004 in
Worn Limits (Not Over)	0.152 mm	0.006 in
Out-of-Round (Not Over)	0.022 mm	0.0009 in
RPO L37
Valve Timing (With Ramp at 0.100 mm Lift), Intake Opens	13 degrees BTDC
Intake Closes	73 degrees ABDC
Exhaust Opens	51 degrees BBDC
Exhaust Closes	13 degrees ATDC
Valve Lift, Intake	9.4 mm	0.370 in
Exhaust	8.6 mm	0.339 in
Duration (@0.100 mm Lift), Intake	266 degrees
Exhaust	244 degrees
Valve Overlap (@ 0.100 mm Lift)	26 degrees
RPO LD8
Valve Timing (With Ramp at 0.100 mm Lift), Intake Opens	9 degrees BTDC
Intake Closes	55 degrees ABDC
Exhaust Opens	51 degrees BBDC
Exhaust Closes	13 degrees ATDC
Valve Lift, Intake	8.6 mm	0.339 in
Exhaust	8.6 mm	0.339 in
Duration (@ 0.100 mm Lift), Intake	244 degrees
Exhaust	244 degrees
Valve Overlap (@ 0.100 mm Lift)	22 degrees
Connecting Rods
Bearing Material	Aluminum
Clearance Between Bearing and Crankshaft -- New Limits	0.025-0.076 mm	0.001-0.003 in
Worn Limits (Not Over)	0.076 mm	0.003 in
Diameter, Lower End (Without Bearing)	57.144 mm	2.249 in
Piston Pin Hole	22.022-22.008 mm	0.8662-0.866 in
Length, Center to Center	151 mm	5.94 in
End Play of Rods on Crank Pin	0.20-0.50 mm	0.008-0.020 in
Piston Rings
Side Clearance -- Top and Second Compression Ring	0.040-0.095 mm	0.0016-0.0037 in
Side Clearance -- Oil Rings	None--Side Sealing
Ring End gap -- Top Compression Ring	0.25-0.40 mm	0.010-0.016 in
Ring End Gap -- Second Compression Ring	0.35-0.50 mm	0.014-0.020 in
Ring End Gap -- Oil Rings	0.25-0.76 mm	0.010-0.030 in
Number of Compression Rings	2
Number of Oil Rings	2 Rings -- 1 Expander
Width of Compression Ring Groove -- Top Ring	1.230-1.255 mm	0.048-0.049 in
Width of Compression Ring Groove -- Second Ring	1.530-1.555 mm	0.060-0.061 in
Width of Compression Ring Groove -- Oil Ring	3.030-3.055 mm	0.119-0.120 in
Pistons
Piston Material	Aluminum
Piston Diameter @ 40 mm from Top of Piston	92.957-92.972 mm	3.6597-3.6603 in
Piston Pin Diameter	21.995-22.000 mm	0.865-0.866 in
Piston Pin Bore Diameter	22.002-22.008 mm	0.8662-0.8665 in
Pin Retention	Snap Rings (2)
Piston Taper	No Piston Taper Measurement
Oil System
Oil Pump Type	Gerotor
Minimum Pressure at Normal Operating Temperature @ Idle	35 kPa	5 psi
Minimum Pressure at Normal Operating Temperature @ 2000 RPM	250 kPa	35 psi
Oil Pressure Recirculation	Internal Piston Valve
Oil Filter Type	PF 58
Oil Capacity with Filter	--	7.5 Quarts
Without Filter	--	7 Quarts
Crankshaft and Main Bearings
Main Bearing Clearance Limit -- New Limit	0.015-0.055 mm	0.0006-0.002 in
Main Bearing Clearance Limit -- Worn Limit	0.0635 mm	0.0025 in
Main Bearing Journal Diameter	64.352-64.346 mm	2.5335-2.5337 in
Main Bearing Journal Out-of-Round (Not Over)	0.004 mm	0.00016 in
Main Bearing Journal Taper	0.004 mm	0.00016 in
Main Bearing Journal Length -- No. 1	24.6 mm	0.969 in
Main Bearing Journal Length -- No. 2	24.6 mm	0.969 in
Main Bearing Journal Length -- No. 3	25.2 mm	0.992 in
Main Bearing Journal Length -- No. 4	24.6 mm	0.969 in
Main Bearing Journal Length -- No. 5	24.6 mm	0.969 in
Crankpin Journal Diameter	53.948-53.962 mm	2.1239-2.1245 in
Crankpin Journal Out-of-Round (Not Over)	0.004 mm	0.00016 in
Crankpin Journal Taper	0.005 mm	0.0002 in
End Play in Crankshaft -- New Limits	0.05-0.5 mm	0.002-0.019 in
End Play in Crankshaft -- Worn Limits	0.5 mm	0.020 in
Flywheel Flange Face Runout	0.025 mm	0.001 in
Rear Main Seal Diameter	95.76-95.98 mm	3.77-3.78 in