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Piston, Piston Rings, and Piston Pin cont.
Top and Center Compression Ring End Gap
New Bore
CH18/CH620,CH20/CH640,CH22 (624 cc) ...................................................0.25/0.45 mm (0.0098/0.0177 in.)
CH22/CH670,CH23/CH680 (674 cc) ..............................................................0.18/0.46 mm (0.0071/0.0181 in.)
CH25,CH26/CH735,CH730,CH740,CH745 ..................................................0.25/0.56 mm (0.0100/0.0224 in.)
Used Bore (Max)
CH18/CH620,CH20/CH640,CH22 (624 cc) ...................................................0.77 mm (0.030 in.)
CH22/CH670,CH23/CH680 (674 cc) ..............................................................0.80 mm (0.0315 in.)
CH25,CH26/CH735,CH730,CH740,CH745,CH750 ....................................0.94 mm (0.037 in.)
Piston Thrust Face O.D.²
New
CH18/CH620,CH20/CH640,CH22 (624 cc) ...................................................76.967/76.985 mm (3.0302/3.0309 in.)
CH22/CH670,CH23/CH680 (674 cc) ..............................................................79.963/79.979 mm (3.1481/3.1488 in.)
CH25,CH26/CH735,CH730,CH740,CH745,CH750 .....................................82.986 mm (3.2671 in.)
Max. Wear Limit
CH18/CH620,CH20/CH640,CH22 (624 cc) ...................................................76.840 mm (3.0252 in.)
CH22/CH670 (674 cc) ......................................................................................79.831 mm (3.1430 in.)
CH25,CH26/CH735,CH730,CH740,CH745,CH750..... ................................82.841 mm (3.2614 in.)
Piston Thrust Face-to-Cylinder Bore² Running Clearance
New
CH18/CH620,CH20/CH640,CH22 (624 cc) ...................................................0.014/0.057 mm (0.0005/0.0022 in.)
CH22/CH670,CH23/CH680 (674 cc) ..............................................................0.021/0.062 mm (0.0008/0.0024 in.)
CH25,CH26/CH735,CH730,CH740,CH745,CH750 .....................................0.001/0.045 mm (0.039/0.0018 in.)
Speed Control Bracket
Fastener Torque ........................................................................................................10.7 N·m (95 in. lb.) into new holes
Starter Assembly
Thru Bolt Torque
UTE/Johnson Electric, Eaton (Inertia Drive) ................................................4.5-5.7 N·m (40-50 in. lb.)
Nippondenso (Solenoid Shift) .......................................................................4.5-7.5 N·m (40-84 in. lb.)
Delco-Remy (Solenoid Shift) ..........................................................................5.6-9.0 N·m (49-79 in. lb.)
Mounting Screw Torque (All).................................................................................15.3 N·m (135 in. lb.)
Brush Holder Mounting Screw Torque
Delco-Remy Starter ..........................................................................................2.5-3.3 N·m (22-29 in. lb.)
Solenoid (Starter)
Mounting Hardware Torque
Nippondenso Starter .......................................................................................6.0-9.0 N·m (53-79 in. lb.)
Delco-Remy Starter ..........................................................................................4.0-6.0 N·m (35-53 in. lb.)
Nut, Positive (+) Brush Lead Torque
Nippondenso Starter .......................................................................................8.0-12.0 N·m (71-106 in. lb.)
Delco-Remy Starter ..........................................................................................8.0-11.0 N·m (71-97 in. lb.)
Stator
Mounting Screw Torque ..........................................................................................6.2 N·m (55 in. lb.)
² Measure 6 mm (0.236 in.) above the bottom of the piston skirt at right angles to the piston pin.
Safety and General Information
7.3 N·m (65 in. lb.) into used holes
Section 1
1
1.13
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