LS7 Corvette Mechanical Repair Specs (PDF) - Bakes Online

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Print Preview Version 8.0 PubTeX output 2006.06.15:1036 File: C:\DOCUME~1\PCOMPO~1.IGS\LOCALS~1\Temp\.aptcache\2006LS7/tfa01804.dvi User: PComposer Page: 2522006 Y Car GMX245 Corvette7.0L (LS7) Engine Mechanical1552519The 7.0 Liter V8 engine is identified as RPO LS7 VIN Y/E.Camshaft and Drive SystemA billet steel 1 piece camshaft is supported by 5 bearings pressed into the engine block. The camshaft timing sprocketis mounted to the front of the camshaft and is driven by the crankshaft sprocket through the camshaft timing chain.The camshaft position (CMP) sensor lobes are incorporated into the front face of the camshaft sprocket, with the CMPsensor mounted to the engine front cover. A timing chain dampener is mounted to the front of the engine block abovethe crankshaft sprocket. The externally splined crankshaft sprocket is positioned to the crankshaft by a key and keyway.The crankshaft sprocket external splines drive the oil pump drive gears. A retaining plate mounted to the front of theengine block maintains camshaft location.CrankshaftThe precision-balanced crankshaft is forged steel and is supported by 5 crankshaft bearings. The bearings are retained byforged steel crankshaft bearing caps, which are machined with the engine block for proper alignment and clearance. Thecrankshaft journals are undercut and rolled. The center main journal is the thrust journal. A crankshaft position (CKP)reluctor ring is press-fit mounted at the rear of the crankshaft. The reluctor ring is not serviceable separately.Cylinder HeadsThe cylinder heads are cast aluminum and include pressed-in-place powdered metal valve guides, 56 mm (2.20 in)diameter titanium intake valves, 41 mm (1.61 in) diameter sodium filled stem exhaust valves, and 70 cubic centimetercombustion chambers. Passages for the engine coolant air bleed system are at the front of each cylinder head. The valverocker arm covers are retained to the cylinder heads by 4 center mounted rocker arm cover bolts.Engine BlockThe engine block is a cam-in-block deep skirt 90 degree V configuration with 5 forged steel crankshaft bearing caps. Theengine block is cast aluminum with press-in-place iron cylinder liners. The 5 crankshaft bearing caps each have 4 verticalM10 and 2 horizontal M8 mounting bolts. The engine block and bearing caps are aligned by dowel pins retained in thecaps. The camshaft is supported by 5 press-in-place camshaft bearings.252 of 272
Print Preview Version 8.0 PubTeX output 2006.06.15:1036 File: C:\DOCUME~1\PCOMPO~1.IGS\LOCALS~1\Temp\.aptcache\2006LS7/tfa01804.dvi User: PComposer Page: 2532006 Y Car GMX245 Corvette7.0L (LS7) Engine MechanicalExhaust ManifoldsThe hydro-formed stainless steel exhaust headers are a 1 piece steel design with unique quad flow collector flanges. Theexhaust manifolds direct exhaust gasses from the combustion chambers to the exhaust system. Each manifold also has anexternally mounted heat shield that is retained by bolts.Intake ManifoldThe intake manifold is a friction welded 3 piece composite design that incorporates brass threaded inserts for mountingthe fuel rail, throttle body, and wire harness studs. Each side of the intake manifold is sealed to the cylinder head by4 non-reusable push-in-place silicone sealing gaskets. The 90 mm (3.54 in) electronically actuated throttle body bolts to thefront of the intake manifold. The throttle body is sealed by a 1 piece push-in-place silicone gasket. The fuel rail assembly,with 8 separate fuel injectors, is retained to the intake by 4 bolts. The injectors are seated into their individual manifold boreswith O-ring seals to provide sealing. 2 fuel rail stop brackets are retained to the rear of the intake manifold by mountingbolts. The manifold absolute pressure (MAP) sensor is installed and retained to the top front of the intake manifold andsealed by an O-ring seal. The evaporative (EVAP) emission canister purge solenoid valve is mounted to the front of theright cylinder head. There are no coolant passages within the intake manifold.Oil PanThe structural oil pan is cast aluminum. Incorporated into the design are the oil filter mounting boss, drain plug openingand internal oil passages. The alignment of the structural oil pan to the rear of the engine block and transmissionhousing is critical.Piston and Connecting Rod AssemblyThe pistons are cast aluminum. The pistons use 2 compression rings and 1 oil control ring assembly. The piston is a lowfriction, lightweight design with a recessed top and barrel shaped skirt. The piston pins are chromium steel and are afull-floating design. The connecting rods are forged titanium alloy with press-in-place piston pin bushings. The connectingrods and rod cap are aligned by dowel pins retained in the cap. All applications use a piston with a graphite coated skirt.The piston, pin, and connecting rod are to be serviced as an assembly.Valve Rocker Arm Cover AssembliesThe valve rocker arm covers are cast aluminum and use a pre-molded silicon gasket for sealing. Mounted to each rockercover is a coil and bracket assembly. Positive crankcase ventilation (PCV) fresh air passages are incorporated into both theleft and right side covers. The cap on the right valve cover is not to be used for oil fill.Valve TrainMotion is transmitted from the camshaft, through the hydraulic roller valve lifters and tubular pushrods, to the roller typerocker arms. The nylon valve lifter guides position and retain the valve lifters. The valve rocker arms for each bank ofcylinders are mounted directly to the cylinder heads. Each rocker arm is retained to the cylinder head by a bolt. Valvelash is net build. The exhaust valves have sodium filled valve stems. The intake valves are a titanium design and have arocker arm wear pad at the top of the stem.Description and Operation1674147New Product InformationThe purpose of New Product Information is to highlight, or indicate, important product changes from the previousmodel year.Changes may include 1 or more of the following items:• Torque values and/or fastener tightening strategies• Changed engine specifications• New sealants and/or adhesives• Disassembly and assembly procedure revisions• Engine mechanical diagnostic procedure revisions• New special tools required• A component comparison from the previous yearTorque Values and/or Fastener Tightening Strategies253 of 272
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LS7 Corvette Mechanical Repair Specs (PDF) - Bakes Online

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