500SEC (140.070) V8-5.0L (119.970) (1993)
Valve: Service and Repair
Replacement
Preparation
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Camshafts removed. See: Camshaft, Lifters and Push Rods/Camshaft/Service and Repair
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Cylinder head removed. See: Service and Repair/Procedures
Overview
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Place cylinder head (87) on assembly base (24), special tool 111589 02 59 00.
NOTE: Place insert (26) Ill 589 02 59 09 into assembly base (24) with the direction of travel arrow (26) facing forward and with the appropriate
side.
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Bolt cylinder head (87) on to assembly bass (24).
NOTE:
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Bolt cylinder head (87) onto the assembly base (24) with a cylinder head bolt (23) at the front and rear and with its front end facing toward the
direction of travel arrow (26).
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The cylinder head (67) can be installed with the exhaust manifold.
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Fit supporting bar special tool 111 589 01 59 00 (2) with slide (7), onto the relevant cylinder head off-centered, take off.
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Bolt supporting bar (2) on with two M7 X 35 bolts (camshaft bearing cap bolts), unbolt.
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Remove bucket tappet (3) of the relevant cylinder, install.
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Attach lever depressor (9) with thrust piece (6) to slide (7), special tools 111 589 18 61 00 and 111 589 26 63 00.
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Attach thrust piece (5) vertically to valve spring retainer (16).
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Fix slide (7) in position with bolt (8).
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Compress valve spring (17).
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Remove/install valve collets (14), with tweezers, special tool 116 589 06 63 00 (6), magnetic finger.
Installation Note: Coat valve spring retainer (15) with grease in order to fix collets (14) in position.
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Remove/install valve spring retainer (15) together with valve spring (17).
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Replace valve stem seal (19). See: Seals and Gaskets/Valve Guide Seal/Service and Repair
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Remove bottom valve spring retainer (20) and inspect for pitting, install.
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Remove cylinder head (87) from assembly base (24), remove valves (21).
NOTE:
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Valve springs, top and bottom valve spring retainers with pitting must be replaced.
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The valve springs of the inlet and exhaust valves are identical.
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As of 01/1993 conical-shaped valve springs have been installed together with modified valve spring retainers and weight-optimized bucket
tappets.
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The inner valve spring is eliminated.