General Motors — Electronic Governor Actuator Installation (225 Series)
Installation
From a General Motors operator's manual covering: 181 CID, 3.0L L4, GMG-430, LW6. Check it applies to your exact model before use.
Applies to: General Motors 3.0L L4 (181 CID) engine
Procedure
- Drill actuator mounting holes in pre-fabricated bracket. Mount so linkage misalignment is minimal; ball bearing rod ends tolerate max 10 degrees misalignment.
- Affix actuator bracket to selected location on engine.
- Attach actuator securely to mounting bracket.
- Adjust and secure linkage rod and rod end bearings. For linear control, obtain linear relationship between actuator stroke and fuel delivery.
- For diesel fuel systems, linkage typically linear. Actuator lever nearly parallel to fuel control lever and perpendicular to linkage rod at mid fuel position.
- For carbureted fuel systems, linkage typically non-linear. Carburetor butterfly valve lever parallel with actuator lever and linkage rod perpendicular to actuator lever at maximum fuel position.
- Fabricate cable harness to connect speed control unit to actuator. Recommended wire size at least #16 gauge (1.5 mm) for 12V and #18 (1.0 mm) for 24V. Must handle 8 amps for 12V, 4 amps for 24V.
- For 32V operation, wire as for 24V and add 1.5 ohm, 25 Watt resistor in series with pin A of actuator and output terminal of speed control unit.
- Connect A and D of military connector or 2 pin connector harness to speed control unit.
- Push actuator lever to maximum full fuel position. Upon release, linkage should return smoothly to minimum fuel position. Recheck linkage for secure fastening and no binding.
Specs & values
- Max misalignment 10 degrees
- Wire size #16 AWG (12V), #18 AWG (24V)
- Current 8 amps (12V), 4 amps (24V)
- 32V: 1.5 ohm, 25 Watt resistor
Source: General Motors operator's manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.