23170-ZY6-000ZA Honda CASE, MOUNT *NH8* (Honda Code 7634439). (DARK GRAY)

Introduction
The information in this instruction is for the on-engine adjustment of a 3161 Governor on the 3500 Family of Engines.Specific tools that will be needed for the adjustment procedure are also given in a Tools Needed chart.Tools Needed
Governor Preparation
Because of the clearance between the fuel control linkage cover and governor, the upper left side bolt at location (A) must be installed before the cover (1) is put on the terminal shaft, and before the governor is fastened to the drive adapter housing. The other bolts can be installed after the governor is positioned on the engine.Install a new 2W9063 Washer and a new 4H1722 Seal (lip type) in the Fuel Control Linkage Cover.Put clean engine oil on the lip of the seal, and install the cover over the governor terminal shaft. There are two control levers for the 3161 Governor used on 3500 Engines. Lever (2) has a fixed pin and lever (3) has an adjustable pin. Lever (2), with the fixed pin, is used on the 3161 Generator Set and earlier Standard Governors.Lever (3), with the adjustable pin, is used on 3161 Governors with fuel air ratio control adjustment and torque rise features. Lever (3) is used to synchronize governor fuel air ratio control adjustment and torque rise schedules to engine fuel zero reference position. Lever (3), with the adjustable pin, can be used on a right side or left side mounted commercial governor. To convert the lever from right side use to left side use, remove the lock bolt and lock from the adjustable pin.Remove the adjustable pin from the lever, turn it around, and install it into the lever the opposite way. Install the lock and bolt into the adjustable pin and tighten just enough to hold in position. The lever can now be used on the other end of the terminal shaft for left side mounted governors. The lever and pin (fixed or adjustable) connect the governor terminal shaft to the fuel control linkage stop lever. The lever pin moves in notch (4) of the stop lever. This causes the two to move together. The 3161 Generator Set and earlier Standard Governors with fixed pin control levers do not require special adjustments when installed on the engine.
Some industrial units were sold with fuel air ratio control adjustment without the adjustable lever. These units require setting the fuel air ratio control adjustment after governor installation.
After fuel control linkage cover (1) is in position, install lever (2) on the governor terminal shaft. Tighten the bolt to a torque of 25 7 N m (18 5 lb ft). Control levers can only be installed the correct way, because of the flat and groove of the terminal shaft and the lever pin.This control lever is for right-side mounted governors. On control levers for left-side mounted governors, the pin is reversed. For those 3161 Governors with fuel air ratio control adjustment and torque rise features, the adjustable pin control lever is installed on the terminal shaft. Bolt (5) is then tightened to a torque of 25 7 N m (18 5 lb ft).Before the governor is installed, tighten the pin lock bolt (6) so it will hold the pin in position when the governor is installed on the engine.After the governor is installed on an engine, the adjustable pin is turned to synchronize the governor travel to the fuel control linkage. For correct adjustment and setting of these governors, refer the topic entitled Governor Installation in this publication.
Before the governor is installed on an engine, make sure the pin of adjustable control lever (3) is at the bottom of the lever as shown. If the pin is not in this position, the control lever can bind or become disconnected from the engine fuel control linkage. Engine overspeed can be the result.
Governor Installation
To prevent damage to the governor, do not drop it and do not set it on the drive shaft, the terminal shaft or the speed adjusting shaft.
3161 Generator Set and Earlier Standard Governors
1. Make sure four O-ring seals (8), are in position on the governor drive housing. Install the seal on the governor oil pump housing. Put clean engine oil on all seals. 2. Put the governor and cover gasket in position. Make sure the governor drive shaft and the spline drive are in correct alignment. The pin on the governor lever must engage in the slot in the fuel control linkage stop lever.
Cover removed for illustrative purposes only. Be sure there is no binding, side load on the drive shaft, or looseness in the drive coupling. The maximum runout of the governor drive shaft and coupling must be less than 0.15 mm (0.006"). Parts that do not fit correctly or are not in alignment, can cause early wear, shaft seizure, or governor drive shaft failure. 3. Move the governor to put cover (1) in correct alignment (square) with the front housing of the engine. With the governor in alignment, install and tighten bolts (9) to hold the governor to the drive housing.
Tighten governor to base by initially tightening each bolt lightly to seat the governor. Finish by tightening each bolt to standard torque.This procedure will preserve the base gasket integrity and vertical governor alignment.
4. Put cover (1) against the front drive housing and make sure the gasket is in alignment. Install and tighten the bolts. Check the governor terminal shaft for free movement, refer to Step 6.5. Install bracket (10) as follows:* Install two bolts in the side of the governor.* Slide bracket (10) in place on the bolts. Tighten the bolts enough to hold bracket (10) in position. The bracket must be free enough to move.* Install and tighten the two bolts that hold bracket (10) to the top of cover (2). This puts the bracket in correct alignment.* Tighten the two bolts that hold bracket (10) to the governor.* Check the governor terminal shaft for free movement, refer to Step 6. 6. Move the governor terminal shaft several times in