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Tillotson Throttle Shaft Clip Screw (Big)
15C-18 Tillotson Throttle Shaft Clip Screw (Big)
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Tillotson Throttle Shaft Clip Screw (Big)

Part Number: 15C-18
Online Price: $0.99
15C-18 OEM Tillotson Throttle Shaft Clip Screw (0.168" Hole)
Availability: In Stock.

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Description

15C-18 Tillotson OEM Throttle Shaft Clip Screw (Large Hole – 0.168")


Secures Throttle Shaft Clip | Prevents Shaft Movement | Fits Select HL Models

The 15C-18 Tillotson Throttle Shaft Clip Screw is a genuine OEM screw designed to secure the throttle shaft retaining clip to the carburetor body, ensuring the throttle shaft stays properly aligned and doesn’t slide side to side during operation.


This version of the screw is specifically made for throttle shaft clips with a larger 0.168-inch hole. Using the correct clip and screw combination is essential for maintaining carburetor integrity and performance.


Key Features:

  • OEM Tillotson Part #15C-18
  • Compatible with clips using a 0.168" (large) hole
  • Prevents throttle shaft lateral movement
  • Ensures secure throttle shaft retention
  • Ideal for rebuilds and high-performance applications


Fitment Notice:

This screw is for larger-hole throttle shaft clips. If your clip has a smaller hole, use the 15C-19 screw instead. Always check your clip’s size or refer to your carburetor’s parts diagram before ordering.


Confirmed Fitment:

The 15C-18 screw is compatible with the following Tillotson carburetors:

HL-129E, HL-132H, HL-166B, HL-166C, HL-229A, HL-324A, HL-339A, HL-352A, HL-366A, HL-371A, HL-382A

These models commonly use the large-hole throttle shaft clip.


Applications:

  • Racing and high-performance engines
  • Routine carburetor rebuilds or maintenance
  • Vintage or legacy small engine restorations
  • Replacing stripped, worn, or missing shaft clip screws


Installation Tip:

Apply a medium-strength thread locker (blue) during installation to prevent the screw from backing out due to engine vibration.

FAQ

Q1: What does the 15C-18 screw do in a Tillotson carburetor?
A: It secures the throttle shaft clip to the carburetor body, preventing the throttle shaft from moving side to side, which helps maintain consistent throttle control.


Q2: What size clip hole does this screw fit?
A: The 15C-18 screw is designed for throttle shaft clips with a 0.168-inch (large) hole.


Q3: What happens if I use the wrong size screw or clip?
A: Using the wrong screw can lead to poor engagement, stripped threads, or a loose clip—resulting in throttle misalignment and performance issues.


Q4: What models does the 15C-18 fit?
A: It fits select Tillotson HL models, including:
HL-129E, HL-132H, HL-166B, HL-166C, HL-229A, HL-324A, HL-339A, HL-352A, HL-366A, HL-371A, HL-382A


Q5: Should I use thread locker on this screw?
A: Yes. We recommend applying a blue (medium strength) thread locker during installation to prevent loosening from vibration.


Q6: Can I reuse this screw during a rebuild?
A: If the threads and head are in good condition, yes. However, if there's any wear or damage, it's best to replace it to ensure proper throttle shaft retention.


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