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Other periodic maintenance:
• Connecting rod: The connecting rod should be replaced when the
piston and sleeve are replaced. Also replace the piston wrist pin and
G-clip whenever the connecting rod is replaced. As with other internal
engine components, connecting rod life depends on engine usage
and the quality and frequency of engine maintenance. Inspect the
connecting rod after three gallons of fuel have been used.
• Slipper clutch pegs (friction material): The slipper clutch pegs will wear
over time and require replacement. The life of the pegs depends on
how the slipper clutch was adjusted and how the Nitro Stampede was
used. If the slipper will not tighten or you are seeing signs of wear on
the face of the gear, then the pegs should be replaced.
• Piston/sleeve: The life of the piston and sleeve will vary greatly with
how the engine was used and maintained. The piston and sleeve
should be replaced when they no longer seal effectively (loss of
compression). Symptoms include the engine being difficult to start
when warm, stalling when warm, and stalling when throttle is suddenly
closed to idle. Replace the wrist pin and G-clip whenever the piston
and sleeve are replaced.
After-run Procedure
You must perform after-run maintenance on your Traxxas engine
whenever the model will be stored for longer than a few hours. Taking the
time to prepare your engine for storage will reward you with longer engine
life, easier starting, and better performance.
When a nitro engine is shut off, some excess unburned fuel remains in
the engine. The methanol in model engine fuel is hygroscopic, which
means it easily attracts and absorbs moisture. This moisture can cause
rust and corrosion on the steel engine parts (crankshaft, bearings, wrist
pin and starter shaft) if the fuel is not removed from the engine. There are
after run oil products available from your hobby dealer or you can use a
water-displacing spray lubricant. To ensure your TRX 3.3 Racing Engine is
protected from internal corrosion, use the following procedure:
1. Whenever possible, shut off the engine by pinching the fuel line closed.
This allows most of the excess fuel to be consumed by the engine. Be
sure the throttle is in the idle position. You may have to pinch the fuel
line closed for several seconds before the engine stops.
2. Completely empty the fuel tank. Use your fuel-dispensing bottle to
suck out the old fuel. Do not mix the old fuel with your fresh fuel
supply. If you leave fuel in the tank, transporting or handling your
Slayer Pro 4x4 may cause fuel to run into the engine.
3. With the fuel tank empty and the throttle at the idle position, try to
start the engine. The engine will most likely start and run for a few
seconds as it uses up any fuel remaining in the engine and fuel lines.
4. Once the engine stops, clean the outside of the engine with
compressed air or spray motor cleaner. Once the engine is clean and
dry, remove the glow plug power wire, glow plug, and air filter.
5. Open the throttle fully and spray a one-second burst of WD-40 into the
carburetor and into the glow plug hole (Caution! Wear safety glasses to
prevent spray from getting into your eyes). If you are using after-run oil,
follow the manufacturer's instructions.
6. Place a rag or paper towel over the engine to catch any WD-40 or after-
run oil that may come out the carburetor or glow plug hole.
7. Connect the EZ-Start controller to the model and spin the engine for 10
seconds.
8. Remove the rag or paper towel and repeat steps 5–7 two
more times.
9. Clean and re-oil the air filter so it will be ready for use next time. See
page 6 for air filter maintenance instructions.
10. Replace the glow plug, reconnect the glow plug power wire, and
reinstall the air filter.
Clearing a Flooded Engine
If the engine is primed for too long during startup, then it can become
flooded with fuel. When the engine is flooded it will no longer turn due to
excess fuel in the combustion chamber preventing upward movement of
the piston. Use the following procedure to clear a flooded engine:
1. Remove the blue glow plug wire.
2. Remove the glow plug and gasket with the glow plug wrench supplied
with your model. A 5/16 or 8mm nut driver will also work.
3. Turn the model upside down and plug in the EZ-Start controller.
4. Push the EZ-Start button for several seconds to clear the engine
of excess fuel. Do not look into the glow plug hole while the
engine is spinning or you could spray fuel into your face!
5. Turn the model over and reinstall the glow plug and gasket.
6. Reconnect the blue glow plug wire to the glow plug.
7. Reconnect the EZ-Start controller.
8. Do not prime the engine. Pull the throttle to 1/2 throttle and push the
EZ-Start button. The engine should start immediately.
Piston stuck at "top dead center" (TDC)
"Top dead center" is the position where the piston is at the very top of
the tapered sleeve. Occasionally an engine can get "stuck" at this position.
This is most likely to happen on new engines during break-in, but can
also happen at other times. If the engine is stuck at TDC, use the following
procedure to release the piston from the sleeve:
1. Remove the glow plug using the included tool or 8mm (5/16") nut
driver and verify that the piston is at the top of its stroke.
2. Turn the Slayer Pro 4x4 over and locate the flywheel through the cutout
in the chassis. Insert a flat blade screwdriver as shown between the
chassis and flywheel. Using the chassis for leverage, rotate the flywheel
counterclockwise by pressing down on the screwdriver. The flywheel
will turn, unsticking the piston from the sleeve.
3. Put two or three drops of light machine oil into the glow plug hole to
lubricate the piston and sleeve. Do not use too much oil. It will hydro-
lock the engine. Verify the starter will spin the engine with the glow
plug out.
4. Rotate the flywheel so the piston is at bottom dead center and replace
the glow plug and gasket. Reconnect the blue glow plug wire.
5. You should now be able to start the engine with the
EZ-Start.
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