California Air Tools 3010 Service Manual download pdf (Page 157)

ENGINE BOTTOM END 8-11

Cylinders and Pistons

Piston Ring, Piston Ring Groove Wear

•

Check for uneven groove wear by inspecting the ring seat-

ing.

The rings should fit perfectly parallel to the groove sur-

faces. If not, the piston must be replaced.

•

With the piston rings in their grooves, make several mea-

surements w ith a thickness gauge [A] to determine piston

ring/groove clearance.

Piston Ring/Groove Clearance (Top, Second)

Standard

Top

0.04 ∼ 0.08 mm(0.0016 ∼ 0.0031 in.)

Second 0.03 ∼ 0.07 mm(0.0011 ∼ 0.0028 in.)

Service Limit

Top

0.18 m m(0.0070 in.)

Second 0.17 mm(0.0067 in.)

Piston Ring End Gap

•

Place the piston ring inside the cylinder, using the piston

to locate the ring squarely in place. Set it close to the

bottom of the cylinder, where cylinder were is low.

•

Measure the gap between the ends of the ring with a thick-

ness gauge.

Piston Ring End G ap (Top, Second)

Standard: 0.2 ∼ 0.4 m m (0.008 ∼ 0.016 in.)

Service Limit: 0.7 mm (0.028 in .)

Cylinder Inside Diameter

•

Take a side-to-side and a front-to-back measurement at

each of the 3 locations (total of 6 measurements) shown

in the figure.

If any of the measurements exceeds the service limit, the

cylinder will have to be bored to oversize and then honed.

Cylinder I ns id e Diameter

Standard: 75.980 ∼ 76.000 mm (2.9913 ∼ 2.9921

in.) and less than 0.01 mm (0.0004

in.) difference between any two

measurements

Service Limit: 76.10 mm (2.996 in.) or more than 0.05

mm (0.002 in.) difference between any

two measurements

Piston Diameter

•

Measure the outside diameter [A] of the piston 10 mm (0.4

in.) [B] up from the bottom of the piston at right angles to

the direction of the piston pin.

If the measurement is under the service limit, replace the

piston.

Piston D iam eter

Standard:

75.935 ∼ 75.950 mm (2.9896 ∼ 2. 9902

in.)

Service L imit: 75.80 m m (2.984 in.)

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California Air Tools 3010 Service Manual Page 157

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