Suzuki 2000 Grand Vitara SQ625 Service Manual page 471

6A4-52 ENGINE MECHANICAL (J20 ENGINE)
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
Inner
Valve spring g
free length
Outer
Inner
Valve spring g
preload
Outer
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.)
Standard
36.08 mm
(1.4204 in.)
40.44 mm
(1.5921 in.)
6.9 – 7.9 kg for
27.5 mm
(15.2 – 17.4 lb/
1.08 in.)
15.4 – 17.8 kg for
31.7 mm
(33.9 – 39.2 lb/
1.25 in.)
Limit
35.00 mm
(1.3780 in.)
39.22 mm
(1.5441 in.)
6.2 kg for
27.5 mm
(13.6 lb/
1.08 in.)
13.8 kg for
31.7 mm
(30.4 lb/
1.25 in.)