Piston & Ring Kit, Standard (3.50 inch) – Fits Evinrude/Johnson 85-300 HP (Replaces 5006658)
Piston & Ring Kit, Standard (3.50 inch) – Fits Evinrude/Johnson 85-300 HP (Replaces 5006658) is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
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Piston & Ring Kit, Standard (3.50 inch) – Fits Evinrude/Johnson...
Product Details
This is a complete Piston & Ring Kit, Standard (3.50 inch) – Fits Evinrude/Johnson 85-300 HP (Replaces 5006658), designed for various Evinrude/Johnson V4 and V6 engines that utilize a 3.500" standard bore. It serves as a high-quality aftermarket replacement to restore compression and performance.
This kit provides a direct interchange for BRP/OMC part numbers 393271, 393924, 5006658, and 5006661, as well as aftermarket equivalents from Sierra (18-4120), GLM (24010), Wiseco (3073PS, 3173PS), and Mallory (9-53420).
- Engineered for V4/V6 models requiring a standard 3.500-inch bore.
- Features a C=4 (4-ring) configuration for reliable sealing.
- Includes the essential piston, ring set, wrist pin, and circlips for a complete overhaul.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| BRP/OMC | 5006658 |
| BRP/OMC | 393271 |
| BRP/OMC | 393924 |
| BRP/OMC | 778348 |
| BRP/OMC | 5006661 |
| Sierra | 18-4120 |
| GLM | 24010 |
| Wiseco | 3073PS |
| Wiseco | 3173PS |
| Mallory | 9-53420 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
| Brand | Model | Rated HP | Notes |
|---|---|---|---|
| Evinrude/Johnson | V4 Engines | 85–140 HP | For engines with 3.500" bore |
| Evinrude/Johnson | V6 Engines | 150–300 HP | For engines with 3.500" bore |
Technical Specs
- Product Type
- Piston & Ring Kit, Standard Size
- Bore Size
- 3.500 inches (88.9 mm)
- Compression Ring Configuration
- C=4 (4 ring configuration)
- Dimensions
- 5.63" L x 5.5" W x 5.38" H
- Weight
- 1.88 lbs (0.85 kg)
- UPC
- 745419331399
- OEM Part Number
- 5006658
- Alternative OEM Numbers
- 393271, 393924, 778348
- Warranty
- Standard manufacturer warranty
What’s in the Box
- 1 x Piston (Replaces OMC 393271/393924)
- 1 x Ring Set (Replaces OMC 394930)
- 1 x Wrist Pin (Replaces OMC 327861)
- 2 x Circlips (Replaces OMC 317831)
Installation Notes
- Disconnect the battery and safely access the engine's powerhead.
- Drain necessary fluids and remove the cylinder head(s) covering the target piston.
- Rotate the crankshaft to access and remove the connecting rod cap from the old piston.
- Carefully push the old piston assembly out through the top of the cylinder.
- Thoroughly clean the cylinder bore and inspect for any scoring or out-of-round conditions.
- Install the new rings onto the new piston, following the placement instructions for the C=4 configuration.
- Liberally lubricate the new piston, rings, and cylinder wall with fresh engine oil.
- Using a piston ring compressor, carefully guide the new piston assembly into the cylinder bore, ensuring correct orientation.
- Reattach the connecting rod, torque bolts to manufacturer specifications, and reinstall the cylinder head with a new gasket.
- Refill all fluids, reconnect components, and manually turn the engine over to check for binding before attempting to start.
Troubleshooting & FAQ
How do I confirm this piston kit fits my specific engine?
This kit is for Evinrude/Johnson 85-300 HP V4/V6 engines with a standard 3.500-inch cylinder bore. The best way to confirm fitment is to check your service manual for the original part number and cross-reference it with the numbers in our Part Number Matrix. Measuring your cylinder bore is also a reliable verification method.
What are the signs of a failing piston or rings?
Common symptoms include a noticeable loss of power, excessive blue or white smoke from the exhaust, increased oil consumption between changes, poor engine compression test results, or a persistent metallic "knocking" sound during operation.
What is a "C=4" ring configuration?
C=4 refers to a piston that uses a four-ring setup (typically three compression rings and one oil control ring). This design is specific to certain engine models and is critical for proper combustion sealing and oil management. Ensure this matches your original piston's design.
Do I need special tools for this installation?
Yes. A piston ring compressor is required to safely compress the rings and insert the piston into the cylinder without causing damage. A calibrated torque wrench is also essential for tightening connecting rod and cylinder head bolts to precise OEM specifications.
Is it necessary to hone the cylinder when replacing a piston?
Yes, it is highly recommended to hone the cylinder bore when installing a new piston and rings. Honing creates a cross-hatch pattern on the cylinder wall that helps the new rings seat properly, ensuring optimal compression and longevity.
Should I replace all pistons at the same time?
While you can replace a single failed piston, it is best practice to replace them as a complete set. This ensures balanced performance, weight, and compression across all cylinders, preventing future issues and maximizing engine reliability.
OEM vs. Aftermarket?
This listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.
Shipping speed & cost
We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.
Warranty & returns
Covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused & in original condition). See our policy page or reach out for instructions.
Safety & Important Info
- Verify images/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement, not an OEM component.
- Professional installation is recommended for safety and performance.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
- Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
- Manufacturer-Direct Value — Fair pricing without compromising on materials or QC.
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