Engine Mechanical: For J20 Engine 1D-107
• 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.
Distortion for cylinder head surface on intake and
exhaust manifold
Limit: 0.05 mm (0.002 in.)
Valve Spring Inspection
S5JB0A1426048
Valve Spring Free Length and Preload
Referring to data, check to be sure that each spring is in
sound 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: 51.13 mm (2.013 in.)
Limit: 50.13 mm (1.974 in.)
Valve spring preload
Standard: 219 – 241 N (21.9 – 24.1 kg) for 37.60 mm
(48.3 – 53.1 lb/1.480 in.)
Limit: 208 N (20.8 kg) for 37.60 mm (45.9 lb/1.480 in.)
Spring Squareness
Use a square and surface plate to check each spring for
squareness in terms of clearance between end of valve
spring and square. Valve springs found to exhibit a
larger clearance than limit must be replaced.
Valve spring squareness
Limit: 1.6 mm (0.063 in.)
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I2RH0B140107-01
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