1991 LEXUS SC400 Service Repair Manual

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Page 2289 of 4087

LEXUS SC400 1991 Service Repair Manual 16. IF NECESSARY, REPLACE SPARK PLUG TUBEGASKETS (a) Bend the ventilation case claw installed on the cylinderhead cover to an angle of 905 or more. (b) Using SST and a hammer, tap out the gasket. S

Page 2290 of 4087

LEXUS SC400 1991 Service Repair Manual 2. INSTALL VALVES(a) Using SST, push in a new oil seal. SST 09201±41020 (b) Install the following parts:(1) Valve (2) Spring seat (3) Valve spring (4) Spring retainer (c) Using SST, compress the

Page 2291 of 4087

LEXUS SC400 1991 Service Repair Manual INSTALLATION OF CYLINDER HEADS (See Components on pages EM±58 and 59) 1. INSTALL RH EXHAUST MANIFOLD TO RH CYLINDER HEAD (a) Place a new gasket on the cylinder head with the white painted marks f

Page 2292 of 4087

LEXUS SC400 1991 Service Repair Manual (b) Install the exhaust manifold with the eight new nuts.Uniformly tighten the nuts in several passes. Torque: 39 N Vm (400 kgf Vcm, 29 ft Vlbf) (c) Install the main oxygen sensor. Torque: 44 N Vm

Page 2293 of 4087

LEXUS SC400 1991 Service Repair Manual B. Install cylinder head boltsHINT: wThe cylinder head bolts are tighten in two progressive steps (steps (c) and (e)). w If any one of the cylinder head bolts broken or deformed, replace it. (a) Appl

Page 2294 of 4087

LEXUS SC400 1991 Service Repair Manual (b) Remove any old packing (FIPG) material. (c) Apply seal packing to the bearing caps as shown. Seal packing: Part No. 08826±00080 or equivalent (d) (RH Cylinder Head)Install the bearing cap (ma

Page 2295 of 4087

LEXUS SC400 1991 Service Repair Manual (d) Insert a service bolt (A) into the service hole of thecamshaft sub±gear. (e) Using a screwdriver, align the service holes and teeth of the camshaft driven gear and sub±gear by turning camshaf

Page 2296 of 4087

LEXUS SC400 1991 Service Repair Manual (f) Install the other bearing caps in the sequence shownwith the arrow mark facing rearward. HINT: Align the arrow marks at front and rear of the cylinder head with the mark on the bearing cap. (g)
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