Sierra Distributor Cap 18-5244-2, Replaces RA108009, Fits MP 5.0L and 5.7L (2002-05)

The Sierra 18-5244-2 is a replacement distributor cap engineered for MP 5.0L and 5.7L engine models (2002-05). Molded from durable plastic in black, the cap uses a twist-on closure design that seats securely over the distributor housing to maintain a reliable ignition connection. As the distributor cap wears, cracks, or develops carbon tracking, spark distribution to the cylinders becomes inconsistent, leading to misfires, hard starting, or rough idle -- installing a fresh 18-5244-2 restores proper high-voltage routing from the ignition coil to each spark plug wire terminal. This cap is a direct equivalent for OEM number RA108009, so it installs in place of the original part without modification. It is built to the same fit and function as the original equipment cap it replaces, making it a straightforward swap during a routine tune-up or ignition system service. Measuring 3.5 x 7 x 4.5 inches, the cap is sized to match the factory distributor assembly on applicable MP 5.0L and 5.7L engines. Keeping the distributor cap in good condition is a core part of marine engine ignition maintenance, since moisture intrusion and vibration in a marine environment accelerate wear on this component compared to automotive use.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-5244-2
• Product Type: Distributor Cap
• Material: Plastic
• Color: Black
• Closure Type: Twist-On
• Item Dimensions: 3.5 x 7 x 4.5 inches
• Weight: 0.8 pounds
• Fitment: Models MP 5.0L and 5.7L (2002-05)
• Replaces: RA108009

Fitment

• Models MP 5.0L and 5.7L (2002-05)

Replaces (OEM)

• RA108009

Frequently Asked Questions

What engines does the Sierra 18-5244-2 distributor cap fit? The 18-5244-2 is designed for MP 5.0L and 5.7L engine models (2002-05), matching the distributor assembly used on those applications.

Is the 18-5244-2 a direct replacement for RA108009? Yes, the Sierra 18-5244-2 replaces OEM number RA108009 and installs as a direct equivalent on MP 5.0L and 5.7L engines (2002-05).

What material is the distributor cap made from? The 18-5244-2 distributor cap is made from black plastic with a twist-on closure that seats securely over the distributor housing.

What are the dimensions of the 18-5244-2 distributor cap? This Sierra distributor cap measures 3.5 x 7 x 4.5 inches.

How much does the 18-5244-2 distributor cap weigh? The 18-5244-2 weighs 0.8 pounds.

How does the cap attach to the distributor? A twist-on closure is used, so the 18-5244-2 turns and locks into place over the distributor body rather than requiring separate fasteners.

What symptoms indicate the distributor cap needs replacement? Misfires, hard starting, or rough idle on an engine running MP 5.0L or 5.7L can indicate the distributor cap is cracked, worn, or carbon-tracked and due for replacement with a part like the 18-5244-2.

What is included when I order this part? The 18-5244-2 order includes one distributor cap; it does not include a rotor or wires unless listed separately.

Is this a genuine Sierra part or a generic aftermarket cap? The 18-5244-2 is a Sierra-branded distributor cap manufactured to fit MP 5.0L and 5.7L engines (2002-05) as a replacement for RA108009.

Can this cap be used for routine tune-up service? Yes, replacing the distributor cap with the 18-5244-2 during a tune-up helps maintain consistent spark distribution on MP 5.0L and 5.7L engines.