XJ-S V12-5.3L (1982)
Sprocket Bolts And Retaining Tool
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Remove the remaining two camshaft sprocket bolts and fit JD 40.
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Gradually loosen each camshaft cap securing nut two turns at a time until the valve springs are fully relaxed.
L/H Camshaft
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Note the cap to carrier relationship. Remove the nuts and washers and lift-off the bearing caps.
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Remove the camshaft.
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Clean all components thoroughly.
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Examine all component parts for wear and damage. Replace worn or damaged components as necessary.
REFIT
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Be sure that all oilways are clear.
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Lubricate the camshaft journals with clean engine oil.
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Fit the replacement camshaft to the camshaft carrier, using C 3993 to position the camshaft correctly.
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Fit the bearing caps, washers and securing nuts. Progressively tighten the securing nuts to the correct torque, working from the center outwards.
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Check that Timing Gauge C 3993 is in position. Engage the camshaft sprocket to the camshaft, fit and tighten one retaining bolt.
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Remove JD 40 and C 3993.
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Rotate the engine and fit the remaining sprocket retaining bolts. Lock over the tabs.
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Repeat the procedure for the RH camshaft.
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Fit JD 50 (Chain Tension Retainer) and raise the timing chain tensioner slightly.
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Insert JD 50 (Release Tool) through the timing cover. Release the locking catch and allow the tensioner to expand.
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Remove both Service Tools and refit the rubber grommet to the front of the timing cover.
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Adjust the valve clearances. Refit the cam covers and induction manifolds. Evacuate and charge the air conditioning system.
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Refit the air cleaner.
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Reconnect the battery.
VALVE CLEARANCE
Inlet .............................................................................................................................................................................. 0.031 to 0.036 mm (0.012-014 in)
Exhaust ........................................................................................................................................................................ 0.031 to 0.036 mm (0.012-O14 in)
SERVICE TOOLS
Timing Gauge ......................................................................................................................................................................................................... C 3993
Camshaft Sprocket Retainer ..................................................................................................................................................................................... JD 40
Chain Tension Retainer/Release Tool ...................................................................................................................................................................... JD 50
TORQUE FIGURES
Bearing caps to carrier .................................................................................................................................................................................... 11-13.5 Nm
Camshaft sprocket to camshaft ........................................................................................................................................................................... 23-27 Nm
Camshaft cover ........................................................................................................................................................................................................ 77 Nm
EGR valve to throttle housing ........................................................................................................................................................................... 9.5-12 Nm
Elbow to inlet manifold ........................................................................................................................................................................................ 12.2 Nm
Hose clips ............................................................................................................................................................................................................... 2.5 Nm
Inlet manifold to cylinder head (nuts) ................................................................................................................................................................ 23-27 Nm
Inlet manifold to cylinder head (bolts) ............................................................................................................................................................... 23-27 Nm
Silencer to compressor union .................................................................................................................................................................................. 34 Nm
