Piston; Piston Diameter; Piston And Piston Ring - Mazda 626 1989 Workshop Manual

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INSPECTION AND REPAIR

Piston

1. Inspect the outer circumferences of all pistons for

seizure or scoring. Replace if necessary.

2. Measure the outer diameter of each piston at a right

angle (90°) to the piston pin, 18 mm (0.709 in)

below the oil ring land lower edge.

0.25 (0.010) oversize 86.194— 86.214 (3.3935—3.3942)

0.50 (0.020) oversize 86.444— 86.464 (3.4033—3.4041)

3. Check the piston to cylinder clearance.

0.036—0.075 mm (0.0014—0.0030 in)

Maximum: 0.15 mm (0.0059 in)

4. If the clearance exceeds the maximum, replace the

piston or rebore the cylinders to fit oversize pistons.

If the piston is replaced, replace the piston

1. Measure the piston ring to ring land clearance

around the entire circumference using a new pis

Clearance (Top and Second):

0.03—0.07 mm (0.001—0.003 in)

Maximum: 0.15 mm (0.006 in)

2. If the clearance exceeds the maximum, replace the

3. Inspect the piston rings for damage, abnormal

wear, or breakage. Replace if necessary.

4. Insert the piston ring into the cylinder by hand and

push it to the bottom of the ring travel in using the

85,944—85.964 (3 .3 83 6-3.384 4)

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