Isuzu A-4JB1 - Piston Ring and Piston Ring Groove Clearance; Piston Ring and Piston Ring Groove

ENGINE ASSEMBLY ( 2 )
Piston Ring Gap mm(in)
Standard Limit
1st Compression Ring
0.20 – 0.40
2nd Compression Ring
(0.008 – 0.016)
Oil Ring
0.10 – 0.30
(0.004 – 0.012)
Piston Ring and Piston Ring Groove Clearance
Use a feeler gauge to measure the clearance between
the piston ring and the piston ring groove at several
points around the piston.
If the clearance between the piston ring and the piston
ring groove exceeds the specified limit, the piston ring
must be replaced.
Piston Ring and Piston Ring Groove
Clearance mm(in)
Standard Limit
1st
Compression Ring
0.090 – 0.125
(0.0035 – 0.0049)
2nd Compression Ring
0.050 – 0.075 0.15
(0.002 – 0.003) (0.006)
Oil Ring
0.030 – 0.070
(0.0012 – 0.0028)
Visually inspect the piston. If a piston ring groove is
damaged or distorted, the piston must be replaced.
74
1.5
(0.059)