Suzuki WagonR+ RB310 Service Manual page 1907

D 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: 0.10 mm (0.004 in.)
Valve Springs
D Referring to data given below, check to be sure that each spring
is in sound condition, free of any evidence of breakage or weak-
ening. Remember, weakened valve springs can cause chatter,
not to mention possibility of reducing power output due to gas
leakage caused by decreased seating pressure.
Item
Valve spring
free length
Valve spring (20.9 – 23.5 kg) at
preload 32.6 mm (46.1 –
51.8 lb at 1.28 in.)
D Spring squareness:
Use a square and surface plate to check each spring for square-
ness in terms of clearance between end of valve spring and
square. Valve springs found to exhibit a larger clearance than limit
given below must be replaced.
Valve spring squareness limit: 2.0 mm (0.079 in.)
ENGINE MECHANICAL 6A-45
Standard
42.29 mm
(1.6649 in.)
209 – 235 N
187 N (18.7 kg)
(41.2 lb at 1.28 in.)
Limit
41.0 mm
(1.6142 in.)
at 32.6 mm