Suzuki Engine 2002 GRAND VITARA SQ625, Руководство по обслуживанию

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ENGINE MECHANICAL (J20 ENGINE) 6A4-57
• Check cylinder head for cracks on intake and exhaust ports,
combustion chambers, and head surface.
Using straightedge and thickness gauge, check flatness of
gasketed surface at a total of 6 locations. If distortion limit,
given below, is exceeded, correct gasketed surface with a
surface plate and abrasive paper of about #400 (Waterproof
silicon carbide abrasive paper) : Place abrasive paper on
and over surface plate, and rub gasketed surface against
paper to grind off high spots. Should this fail to reduce thick-
ness gauge readings to within limit, replace cylinder head.
Leakage of combustion gases from this gasketed joint is
often due to warped gasketed surface : such leakage results
in reduced power output.
Limit of cylinder head gasketed surface distortion
0.05 mm (0.002 in.)
• Distortion of manifold seating faces :
Check seating faces of cylinder head for manifolds, using a
straightedge and thickness gauge, in order to determine
whether these faces should be corrected or cylinder head
replaced.
Limit of manifold seating face distortion
0.10 mm (0.004 in.)