Suzuki Liana RH418, Supplementary Service Manual

Page: 170 / 371

1D-44 Engine Mechanical:
• Check cylinder head for cracks on intake and exhaust
ports, combustion chambers, and head surface. Using
a straightedge and thickness gauge, check flatness of
gasketed surface at a total of 6 locations. If distortion
limit 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 thickness 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 distortion for cylinder head surface on
piston side
0.03 mm (0.001 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 distortion for cylinder head surface on
intake and exhaust manifold
0.05 mm (0.002 in.)
Valve Spring Inspection
S3RH0B1406028
• Referring to data, check to be sure that each spring is
in standard condition, free of any evidence of
breakage or weakening. Remember, weakened valve
springs can cause chatter, not to mention possibility of
reducing power output due to gas leakage caused by
decreased seating pressure.
Valve spring free length
Standard: 36.83 mm (1.450 in.)
Limit: 35.83 mm (1.411 in.)
Valve spring preload
Standard: 107 – 125 N (10.7 – 12.5 kg) for 31.50
mm (23.6 – 27.6 lb/1.240 in.)
Limit: 102 N (10.2 kg) for 31.50 mm (22.5 lb/1.240
in.)
I2RH0B140106-01
I2RH0B140107-01
I3RH0A140014-01