1987 Mercedes 560SL Service Repair Manual 87

4.2L V8 & 5.6L V8 Article Text 1987 Mercedes-Benz 560SL For 1 Copyright © 1998 Mitchell Repair Information Company, LLC Friday, July 13, 2012 03:57PM ARTICLE BEGINNING 1987 MERCEDES-BENZ ENGINES 4.2L & 5.6L V8 420SEL, 560SEC, 560SEL, 560SL * PLEASE READ THIS FIRST * NOTE: For engine repair procedures not covered in this article, see ENGINE OVERHAUL PROCEDURES - GENERAL INFORMATION article in the GENERAL INFORMATION section. ENGINE CODING ENGINE IDENTIFICATION The engine family designation is shown on the emission control information plate (attached to radiator crossmember). The 1st character identifies the model year ("H" for 1987) while the 4th and 5th characters identify the engine displacement. ENGINE IDENTIFICATION CODES TABLE Application (1) Engine Designation Engine Code 4.2L V8 420SEL ............... 116.965 ........... HMB4.2V6FA10 5.6L V8 560SEC ............... 117.968 ........... HMB5.6V6FA1X 560SEL ............... 117.968 ........... HMB5.6V6FA1X 560SL ................ 117.967 ........... HMB5.6V6FA20 (1) - The engine designation code but must be used when ordering parts or when obtaining technical information. This number identifies specific engine. ENGINE, MANIFOLDS & CYLINDER HEADS ENGINE Removal 1) On 560SL remove engine hood. Remove complete exhaust system. 2) On other models, move engine hood to vertical position. Remove exhaust pipe at manifolds. Drain cooling system, using both left and right engine block drains. Disconnect and remove battery and bracket. Discharge air conditioning system and disconnect hose lines at compressor. 3) Disconnect coolant hoses. Remove radiator and engine

4.2L V8 & 5.6L V8 Article Text (p. 2) 1987 Merced cooling fan. Remove all vacuum, fuel and electrical lines leading to engine. Remove right drag link end from ball stud. 4) Drain power steering reservoir and disconnect hoses. Remove TDC test socket, and remove cable from TDC transmitter. Disconnect regulating shaft. Remove left and right engine shock absorbers. 5) Attach engine sling and hoist to engine and support engine. Remove engine mount bolts. Remove rear engine carrier with engine mount. Remove drive shaft. 6) Remove transmission linkage at transmission. Lift engine/transmission assembly to a 45 degree angle and carefully remove assembly from vehicle. Separate transmission from engine. Installation 1) Ensure oil cooler and all hoses have been flushed and are free from contamination. Replace engine mounts and components as necessary. 2) Reverse removal procedure to complete installation. Recharge air conditioning system and check for leaks. Adjust engine idle speed as necessary. INTAKE MANIFOLD Removal & Installation 1) Disconnect negative battery cable. Partially drain coolant at cylinder block drain plug. Disconnect injection lines and fuel lines. Remove all vacuum hoses. Remove shift cable from automatic transmission. 2) Remove bearing bracket from throttle linkage and bearing bracket from throttle shaft. Disconnect cables and spark plug wiring. Disconnect vacuum lines from automatic transmission and power brake unit. 3) Remove cooling system hoses. Remove intake manifold. Clean intake manifold and check flange surfaces for warpage with straightedge. To install, reverse removal procedure. EXHAUST MANIFOLD Removal & Installation Disconnect negative battery cable. Disconnect exhaust pipe from manifold and EGR line at 90 degree fitting. Remove exhaust manifold retaining bolts and remove exhaust manifold. To install, reverse removal procedure. CYLINDER HEAD NOTE: Allow engine to cool before removing cylinder head. Several specially shaped Allen wrenches are required for cylinder head bolt removal and replacement. Removal 1) Remove left and right cylinder block drain plugs and drain

4.2L V8 & 5.6L V8 Article Text (p. 3) 1987 Merc cooling system. Remove air cleaner and battery. Remove fuel line and injectors. Disconnect fuel injection linkage. 2) Disconnect all fuel and electrical lines leading to intake manifold and remove intake manifold. Remove A/T fluid filler pipe from attachment to cylinder head. Remove alternator and mounting bracket. Remove distributor and power steering pump with mounting bracket. 3) On right cylinder head, disconnect power steering pump hoses and set aside. Remove ignition distributor. Remove slide rail after removing camshaft sprocket. 4) On left cylinder head, disconnect exhaust pipe from manifold and EGR line at 90 degree fitting. Remove chain tensioner and slide rails. Mark camshaft sprocket and timing chain position for reassembly reference. Remove sprocket from camshaft. Using specially shaped Allen wrenches, remove head bolts and lift off cylinder head. Fig. 1: Cylinder Head Tightening Sequence Courtesy of Mercedes-Benz of North America. Installation 1) Ensure all mating surfaces are clean. Install new cylinder head gaskets. Ensure mating surfaces are not damaged. Install cylinder head bolt in rear camshaft bearing bracket before installing head. Tighten cylinder head bolts. See Fig. 1. 2) To complete installation, reverse removal procedure. Run engine at normal operating temperature. Slightly loosen head bolts individually, and retighten to specification. CAMSHAFTS TIMING CHAIN Removal & Installation 1) A split link timing chain is available for repairs without dismantling engine. Set No. 1 piston at TDC. DO NOT use camshaft sprocket bolts to rotate engine. Remove spark plugs and camshaft covers. Remove air cleaner adapter. Cover chain guard and grind open both pins of a link in the timing chain. 2) Remove old link and install new spit link with new chain

4.2L V8 & 5.6L V8 Article Text (p. 4) 1987 Merced attached. Turn crankshaft slowly in normal direction while feeding in new chain and removing old chain. Ensure that chain does not slip on sprockets. Install master link from rear of chain so retaining clip faces front of engine. 3) Install retaining clip with closed end facing direction of rotation. Rotate crankshaft one complete revolution and check for proper alignment of timing marks. To complete installation, reverse removal procedure. Check cam timing. Set distributor rotor alignment. CHAIN TENSIONER 1) Remove air injector pipe and 3 bolts fastening chain tensioner. Remove chain tensioner. See Fig. 2. 2) To check tensioner, place vertically in container of oil with oil covering flange. Actuate plunger to fill tensioner with oil. After filling with oil and venting air, plunger should allow slow and even compression. 3) To install, reverse removal procedure. Use new gasket and tighten bolts evenly. Pressure pin of tensioner must press against lug of tensioning rail. Fig. 2: Timing Chain & Sprockets Courtesy of Mercedes-Benz of North America. VALVE TIMING

4.2L V8 & 5.6L V8 Article Text (p. 5) 1987 Mercedes-Benz 560SLFor 1 Copyright © 1998 Mitchell Repair Information Co Checking 1) Valve timing is measured at intake valves No. 1 and 6. Remove hydraulic valve lifters and replace with Adjustable Rocker Arms (116 050 11 20). Adjust to zero clearance against base circle of camshaft lobe. 2) Attach dial indicator with pointer resting vertically on valve spring retainer. Indicator must have .120" (3.00 mm) preload and dial should be set at "0". 3) Rotate engine in direction of normal rotation until pointer moves .080" (2.00 mm), leaving a preload of .040" (1.0 mm). Readings should be in accordance with valve timing chart. Repeat procedure for No. 6 intake valve. Adjusting 1) If timing requires correction, install an offset Woodruff key or new timing chain. See Fig. 3. An offset by one tooth on camshaft sprocket results in about 18 degrees at crankshaft. 2) An offset Woodruff key will advance or retard camshaft timing depending on the direction of installation. Mark camshaft sprockets and timing chain in relation to each other. Remove respective camshaft sprocket. Place rag under camshaft and remove Woodruff key. 3) Insert selected Woodruff key. Install camshaft sprocket and align with marks. Wide collar on camshaft sprocket should face camshaft. Do not tighten mounting bolt at this time. Mount opposite camshaft sprocket. 4) Tighten mounting bolt to 74 ft. lbs. (100 N.m). After checking and adjusting valve timing, reinstall hydraulic lifters and adjust for proper base setting. Fig. 3: Offset Woodruff Key Location CAMSHAFT & BEARINGS Removal 1) Remove valve covers. Remove fuel pump relay. Set No. 1 piston at TDC on compression stroke and remove rocker arms. DO NOT use camshaft sprocket bolt to rotate engine. Mark sprockets and timing chain for reassembly.

1987 Mercedes 560SL Service Repair Manual 87

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