Crowley Marine: serving boaters for over 40 years Crowley Marine: serving boaters for over 40 years
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Connector, Thumbwheel & Jam-Nut Kit P/N 397129

Safety Considerations

These instructions will alter you to certain things you should do very carefully. If you don't, you could...

  • hurt yourself or bystanders
  • hurt boat operator, passengers
  • damage the machinery

Safety symbol, , appears next to information important to prevent you and others from being hurt.

Note symbol, Note, appears next to information important to keep machinery from being damaged.

IMPORTANT: The important safeguards and instructions appearing in these directions cannot cover all possible conditions or situations that occur. The person following these directions must use common sense, caution and care.

Product Reference & Illustration

When reference is made to brand name, product or specific tool, an equivalent product may be used in place of the referred to product. Substitute products used must have equivalent characteristics, including type, strength, and material. Incorrect substitution may result in product malfunction and possible injury to the operator and/or passengers.

All photographs and illustrations used may not necessarily depict actual models or equipment, but are intended only for reference. Specifications used are based on the latest product information available at the time of publication.



The connector, thumbwheel, jam-nut kit is designed to make throttle cable adjustment easier. This kit can be installed on CR through CD - 40, 45, 50, 55, 65 and 100 tiller steered models.

Check contents of kit:

Ref. Name of Part Qty.
1 Jam Nut 1
2 Thumbwheel 1
3 Throttle Cable Connector 1

Remove screw and spacer washer that secures throttle lever connector (A) to the spark control cam (B). Remove throttle lever connector from end of throttle cable (C).

Before removing throttle cable connector, notice whether arm (D) is above or below throttle cable. Remove screw and spacer washer that secures throttle cable connector. Remove throttle cable connector from throttle cable.

Insert thumbwheel into slot in throttle cable connector. Slide new throttle cable connector over throttle cable until it reaches the threaded area of the cable. Turn thumbwheel until throttle cable connector is centered on threaded area.

Slide jam-nut (1) over throttle cable until it reaches threaded area of cable. Turn nut until threads are engaged. Do not tighten against throttle cable connector.

On 2-cylinder models - place throttle cable connector (3) with thumbwheel (2) down. Install screw in mounting hole (E) on throttle cable connector.

On 3-cylinder and V-4 models - place throttle cable connector (3) with thumbwheel (2) up. Install screw in mounting hole (F) in throttle cable connector. Install spacer washer between throttle cable connector and mounting boss. Tighten screw securely.

Install throttle lever connector on end of throttle cable. Push screw through hole in throttle lever connector and install spacer washer. Tighten screw securely into spark control cam.

Throttle cable adjustment can be made without removing the throttle cable connector. After adjustments are made, tighten jam-nut against throttle cable connector.

Use the service manual for the model engine to be serviced. Check synchronization of engine before returning it to the customer.

0397129 - Connector Assembly

Flat $3.95 Shipping on ALL parts orders

We offer shipping flat $3.95 shipping on ALL parts orders. (Complete Engines, Lower Units and Sterndrives excluded). In addition orders over $89 have reduced cost express shipping available in checkout.

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