Troy-Bilt TB415CS, TB465SS Fig, Fig, Fig, Fig, Stem, N•m), Slot, NOTE:, INTAKE, in.•lb, EXHAUST, Exhaust, Exhaust, Exhaust, Muffler, STORAGE, TabScrew, CLEANING, 0.025 in, Rocker Arm

MAINTENANCE AND REPAIR INSTRUCTIONS

Rocker Arms	Adjusting Nuts
	INTAKE
	EXHAUST

Feeler Gauge

Fig. 34

The recommended clearance for the intake and exhaust is .003 – .006 in. (.076 – 0.152 mm). Use a standard automotive feeler gauge at .005 (0.127mm). The feeler gauge should slide between the rocker arm and valve stem with a slight amount of resistance, without binding. Figure 35 shows how to measure the clearance.

10.If the clearance is not within specification:

a.Turn the adjusting nut using a 5/16 inch (8 mm) wrench or nut driver (Fig. 35).

•To increase clearance, turn the adjusting nut counterclockwise.

•To decrease clearance, turn the adjusting nut clockwise.

b.Recheck both clearances, and adjust as necessary.

Exhaust	Exhaust
Adjusting Nut	Rocker Arm

ExhaustClearance:.003-.006 in.(.076-0.152 mm)

Intake Valve
Stem	Feeler Gauge
Intake Clearance:
.003–.006 in.
(.076–0.152 mm)	Exhaust Valve Stem

Fig. 35

11.Reinstall the rocker arm cover using a new gasket. Torque the screw to 20–30 in•lb (2.2–3.4 N•m).

12.Reinstall the engine cover. Check alignment of the cover before tightening the screws. Tighten screws.

13.Reinstall the muffler cover. Slip the rear tab on the muffler cover into the engine cover rear slot. Then slide the remaining slots into the tabs until they snap into place (Fig. 31).

14.Check the spark plug and reinstall. See Replacing the Spark Plug.

15.Replace the spark plug wire.

REPLACING THE SPARK PLUG

Use a replacement part number 180890 spark plug. The correct air gap is 0.025 in. (0.655 mm.). Remove the plug after every 25 hours of operation and check its condition.

1.Stop the engine and allow it to cool. Grasp the plug wire firmly and pull the cap from the spark plug.

If using a torque wrench torque to: 110-120 in.•lb. (12.3-13.5 N•m)

Do not over tighten.

SPARK ARRESTOR MAINTENANCE

1.Remove the muffler cover. See Rocker Arm Clearance.

2.With a flat blade screwdriver or Torx T-20 bit, remove the screw attaching the spark arrestor cover to the muffler (Fig. 37).

Muffler Spark Arrestor Screen

TabScrewSpark Arrestor CoverSlot

Fig. 37

3.Pull the tab on the spark arrestor cover out of the muffler. Remove the spark arrestor cover.

4.Remove the spark arrestor screen from the spark arrestor cover.

5.Clean the spark arrestor screen with a wire brush or replace it.

6.Reinstall the spark arrestor screen, spark arrestor cover and screw.

CLEANING

Use a small brush to clean off the outside of the unit. Do not use strong detergents. Household cleaners that contain aromatic oils such as pine and lemon, and solvents such as kerosene, can damage plastic housing or handle. Wipe off any moisture with a soft cloth.

WARNING: Do not sand blast, scrape or clean electrodes. Grit in the engine could damage the cylinder.

STORAGE

•Never store the unit with fuel in the tank where fumes may reach an open flame or spark.

•Allow the engine to cool before storing.

•Lock up the unit to prevent unauthorized use or damage.

•Store the unit in a dry, well-ventilated area.

•Store the unit out of the reach of children.

LONG TERM STORAGE

1.Drain all gasoline from the gas tank into a container. Do not use gas that has been stored for more than 60 days. Dispose of the old gasoline in accordance to Federal, State, and Local regulations.

2.Start the engine and allow it to run until it stalls. This ensures that all gasoline has been drained from the carburetor.

3.Allow the engine to cool. Remove the spark plug and put 1 oz. (30 ml) of high quality motor oil into the cylinder. Pull the starter rope slowly to distribute the oil. Reinstall the spark plug.

NOTE: Remove the spark plug and drain all of the oil from the cylinder before attempting to start the trimmer after storage.

4.	Change the oil, referring to Changing the Oil. Dispose of the old oil
	in accordance to Federal, State and Local regulations.
5.	Thoroughly clean the unit and inspect for any loose or damaged
	parts. Repair or replace damaged parts and tighten loose screws,
	nuts or bolts. The unit is ready for storage.

2.Clean dirt from around the spark plug. Remove the spark plug from the cylinder head by turning a 5/8 in. socket counterclockwise.

3.Replace cracked, fouled or dirty spark plug. Set the air gap at 0.025 in. (0.655 mm.) using a feeler gauge (Fig. 36).

4.Install a correctly-gapped spark plug in the cylinder head. Turn the 5/8 in. socket clockwise until snug.

0.025 in.(0.655 mm.)

Fig. 36

TRANSPORTING

•Allow the engine to cool before transporting.

•Secure the unit while transporting.

•Drain the gas tank before transporting.

•Tighten gas cap before transporting.

WARNING: To avoid serious personal injury, always turn your unit off and allow it to cool before you clean or service it.

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