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Tillotson 363-518 Nozzle Check Valve
363-518 Tillotson Nozzle Check Valve
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Tillotson 363-518 Nozzle Check Valve

Part Number: 363-518
Online Price: $13.99
Tillotson Nozzle Check Valve – Carburetor Protection from Backfires | Precision Engine Parts
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Description

Tillotson Nozzle Check Valve – Protects Carburetor from Backfire Damage


The Tillotson Nozzle Check Valve is a crucial component designed to protect the internal parts of your carburetor from damage in the event of a backfire. Featuring a precision-engineered check ball, it seals off the carburetor's interior, preventing fuel or debris from causing potential harm to delicate internal components.


While the nozzle shape and length can impact carburetor tuning and signal, the check ball itself is not a tuning mechanism. It primarily serves as a protective feature, ensuring your carburetor's longevity under high-performance conditions.


If you’re dealing with a flooding condition where the high-side fuel is leaking during idle, the check ball is likely not the cause. This issue is typically a result of a leaking seat or a needle valve that is not sealing properly, and should be addressed accordingly.


Key Features:

  • Primary Function: Protects carburetor internals from damage caused by backfires
  • Precision Check Ball: Seals off the carburetor to prevent fuel or debris damage
  • Non-Tuning Mechanism: The check ball does not affect carburetor tune or signal
  • Compatibility: Designed for Tillotson Nozzles; ensure correct nozzle type (press-in or threaded)
  • Easy Installation: When replacing, make sure the adjustment screw is not in the body to avoid needle damage
  • Correct Alignment: Ensure the side hole lines up with the pick-off hole to avoid tuning issues

Specifications:

  • Nozzle Length: 0.352 inches
  • Nozzle Diameter: 0.25 inches

Important Installation Tips:

  • Press-In vs. Threaded Nozzles: Most Tillotson nozzles are press-in, but some carburetors use a threaded nozzle. Be sure to check your carburetor type before replacing.
  • Adjustment Screw Care: When reinstalling, ensure the adjustment screw is not in the carburetor body to prevent damage to the needle.
  • Alignment: Ensure that the nozzle's side hole aligns with the pick-off hole (fuel circuit hole) to avoid tuning issues and ensure optimal carburetor performance.

Always verify the nozzle listing for your specific carburetor model before ordering. If you don't have the listing, measure the length and diameter of your nozzle to ensure compatibility.

FAQ

Q1: What is the function of the Tillotson Nozzle Check Valve?

A: The Tillotson Nozzle Check Valve serves as a protective component inside the carburetor. Its primary function is to seal off the carburetor’s internal parts in the event of a backfire, preventing potential damage to sensitive components, especially the fuel system.


Q2: Can the Tillotson Nozzle Check Valve affect carburetor tuning?

A: No, the check ball inside the nozzle is not a tuning mechanism. While the nozzle's length and shape can influence the carburetor's signal and tuning, the check valve itself is only there for protection during a backfire, not for altering the fuel mixture or tuning.


Q3: My carburetor is flooding and leaking fuel at idle. Is the check valve the problem?

A: The check valve is typically not the cause of flooding conditions or fuel leakage at idle. This issue is usually due to a leaking seat or a needle valve that isn’t sealing properly, which should be addressed separately from the check valve.


Q4: How do I know if my Tillotson carburetor uses a press-in or threaded nozzle?

A: Most Tillotson nozzles are press-in, but some carburetors use a threaded nozzle. Be sure to check your carburetor type before attempting to replace the nozzle to avoid damaging the components. Always refer to your carburetor's manual for the correct nozzle type.


Q5: What should I do if the nozzle is misaligned during installation?

A: It's important to ensure that the side hole of the nozzle lines up with the pick-off hole (fuel circuit hole). Misalignment can lead to tuning issues or poor carburetor performance, so carefully check alignment before fully securing the nozzle.


Q6: What are the dimensions of the Tillotson Nozzle Check Valve?

A: The Tillotson Nozzle Check Valve has the following dimensions:

  • Nozzle Length: 0.352 inches
  • Nozzle Diameter: 0.25 inches

Ensure these measurements match your carburetor's requirements before ordering a replacement.


Q7: How do I install the Tillotson Nozzle Check Valve?

A: When replacing the nozzle, carefully remove it, ensuring the adjustment screw is not inside the body to avoid damaging the needle valve. When reinstalling the nozzle, check that the side hole is properly aligned with the pick-off hole to maintain proper fuel flow and carburetor performance.


Q8: Do I need to replace the Tillotson Nozzle Check Valve regularly?

A: The Tillotson Nozzle Check Valve is designed to last for a long time, but if you're experiencing performance issues like backfires or flooding, it’s worth checking the condition of the valve. Regular maintenance of your carburetor, including checking the nozzle and valve, will help keep your engine performing at its best.


Q9: Can I use the Tillotson Nozzle Check Valve for other carburetor brands?

A: The Tillotson Nozzle Check Valve is specifically designed for Tillotson carburetors. We recommend checking the specifications and compatibility for other carburetor brands before use, as they may not fit or provide the same protective function.

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