Piston Pins; Piston Ring Side Clearance; Piston Ring End Gap - Hyundai Seasall S250S Workshop Manual

Engine Mechanical System
4. Inspect the piston ring side clearance. Using a
feeler gauge, measure the clearance between new
piston ring and the wall of ring groove.

Piston ring side clearance

No.1: 0.102 ~ 0.146mm (0.0040 ~ 0.0057in.)
No.2: 0.08 ~ 0.12mm (0.0031 ~ 0.0047in.)
Oil ring: 0.03 ~ 0.07mm (0.0012 ~ 0.0028in.)
If the clearance is out of the specification above
replace the piston.
5. Inspect the piston ring end gap. To measure the
piston ring end gap, insert a piston ring into the
cylinder bore. Position the ring at right angles to the
cylinder wall by gently pressing it down with a piston.
Measure the gap with a feeler gauge. If the gap
exceeds the service limit, replace the piston rings. If
the gap is too large, recheck the Cylinder bore inner
diameter. If the bore is over the service limit, the
cylinder block must be re boring

Piston ring end gap

No.1: 0.20 ~ 0.35mm (0.0079 ~ 0.0138in.)
No.2: 0.40 ~ 0.60mm (0.0157 ~ 0.0236in.)
Oil ring: 0.25 ~ 0.50mm (0.0098 ~ 0.0197in.)
47

Piston Pins

Measure the outer diameter of piston pin.
Piston pin diameter:
30.994 ~ 31.000mm (1.2202 ~ 1.2205in)
Measure the piston pin-to-piston clearance.
Piston pin-to-piston clearance:
0.014 ~ 0.027mm (0.0006 ~ 0.0011in)
Cylinder block