INSPECTION / REPAIR

B2-82prose procedure

(3) If the difference between measurements X and Y exceeds the maximum out-of-round, rebore the cylinder to oversize.

Specification	Value
Out-of-round	0.020 mm {0.0009 in} max.

Out-of-round

0.020 mm {0.0009 in} max.

5. If the upper part of a cylinder wall shows uneven wear, remove the ridge with a ridge reamer.

PISTON, PISTON RING, AND PISTON PIN

1
Inspect the outer circumferences of all pistons for seizing and scoring. Replace as necessary.
2
Measure the outer diameter of each piston at a right angle (90°) to the piston pin, 16.5mm {0.65 in} below the oil ring land lower edge.
3
Measure the piston-to-cylinder clearance.
4
If the clearance exceeds the maximum, replace the piston or rebore the cylinders to fit oversize pistons.
5
If the piston is replaced, the piston rings must also be replaced.

Standard

Diameter74.953–74.985 {2.9509–2.9521}

0.25 {0.01} oversize

Diameter75.203–75.235 {2.9608–2.9620}

0.50 {0.02} oversize

Diameter75.453–75.485 {2.9706–2.9718}

Specification	Value
Clearance	0.028–0.056 mm {0.0011–0.0022 in}
Maximum	0.13 mm {0.005 in}

Clearance

0.028–0.056 mm {0.0011–0.0022 in}

Maximum

0.13 mm {0.005 in}

1
Measure the piston ring-to-ring land clearance around the entire circumference by using a new piston ring.
2
If the clearance exceeds the maximum, replace the piston.
3
Inspect the piston rings for damage, abnormal wear, and breakage. Replace the piston ring if necessary.
4
Insert the piston ring into the cylinder by hand and use the piston to push it to the bottom of the ring travel.

Clearance (Top)

0.020–0.065 mm {0.0008–0.0025 in}

Clearance (Second)

0.030–0.065 mm {0.0012–0.0025 in}

Clearance (Oil)

0.025–0.052 mm {0.0010–0.0020 in}

Maximum

0.15 mm {0.006 in}