Maintenance Specifications; Engine Block - RedMax GZ25N Workshop Manual

4. MAINTENANCE SPECIFICATIONS

4-1 Engine Block

Maintenance Item
Cylinder
Compression
kg/cm
Bore
mm(in.)
Piston
Piston dia.
mm(in.)
Piston Ring Groove Width mm(in.)
Piston Pin Hole Bore mm(in.)
Clearance between
Piston & Cylinder
Clearance between Groove
and Piston Ring
Fitting between Piston Pin &
Piston Pin Hole
Piston Ring
End Gap mm(in.)
Width mm(in.)
Piston Pin
Diameter mm(in.)
Connecting Rod
Small End Bore mm(in.)
Clearance between Small End Piston
Pin & Needle Bearing mm(in.)
Clearance between Large End Crank
Pin & Needle Bearing mm(in.)
Parallelness of Large/Small
End Bores
Crankshaft
Diameter at Main Bearing
(MAG, PTO)
Diameter at Oil Seal
(MAG, PTO)
Diameter at Clutch Drum
Bearing ( PTO)
Eccentricity
Width between crank webs mm(in.)
Axial Play
Main Bearing (Ball Bearing)
Clutch Drum
Bore at Bearing
Bore at Drum
Standard
8.7(124)
2
(psi)
ø34(1.339)
ø33.96(1.3370)
ø33.975(1.3376)
1.2(0.047)
ø8(0.3150)
0.025(0.0010)
mm(in.) 0.065(0.0026)
0.04 (0.0016)
mm(in.) 0.08(0.0031)
0.005T(0.00020T)
mm(in.) 0.011L(0.00043L)
0.1(0.0038)
0.3(0.0118
1.2(0.0472)
ø8(0.315)
ø11(0.433)
0 0.021(0.0008)
0.005(0.0002)
0.028(0.0011)
–
mm(in.)
ø12(0.4724)
mm(in.)
ø12(0.472)
mm(in.)
ø12(0.4724)
mm(in.)
mm(in.)
–
22
mm(in.) –
–
mm(in.) ø12 (0.472)
mm(in.) ø54(2.126)
STRATO CHARGED ENGINE GZ25N
Limit
Compression
5.5(78)
Peel off of plating or
expose of base met
ø33.86(1.3331)
1.3(0.051) Thickness Gauge
ø8.04(0.3165) Cylinder Gauge
Micrometer /
0.15(0.0059)
Cylinder Gauge
0.1(0.0039)
Micrometer /
0.05L(0.0020L)
Cylinder Gauge
0.5(0.0197) Thickness Gauge
1.1(0.0433)
ø7.98(0.314)
ø11.05(0.435) Cylinder Gauge
Micrometer /
0.045(0.0018)
Cylinder Gauge
Micrometer /
0.05(0.0020)
Cylinder Gauge
0.15/100
ø11.97(0.4713)
ø11.09(0.469)
ø11.97(0.4713) Micrometer
Dial Gauge /
0.07(0.028)
Centre Support
21.9 22.1
0.5(0.020) Thickness Gauge
Flutter, irregular
noise generated
ø12.05(0.474) Cylinder Gauge
ø54.6(2.150) Vernia Calipers
7
Measuring
Remarks
Instrument
Gauge
Cylinder
Gauge
At right angle to
Micrometer
piston pin.
Thickness
Gauge
Measure at
cylinder skirt.
Micrometer
Micrometer No stepwear is allowed
Mandrel
Dial Gauge
Micrometer
Micrometer
Adjust or exchange
Micrometer