6H3-W0001-02 Gasket Repair Kit for Yamaha 60HP 70HP C70 P60 | JLM Marine

Gasket Repair Kit for Yamaha 60HP 70HP C70 P60 | JLM Marine

This comprehensive Powerhead Gasket Kit is designed for Yamaha outboard engines ranging from 60 HP to 70 HP, including models C70 and P60. It provides a complete seal solution for powerhead rebuilds and routine maintenance, ensuring optimal compression and preventing leaks across all critical engine surfaces.

This kit directly replaces Yamaha OEM part number 6H3-W0001-02-00 and Sierra part number 18-99176, offering a cost-effective aftermarket alternative without sacrificing quality or performance.

• Complete gasket set for comprehensive powerhead service
• Includes head gasket, intake/exhaust gaskets, seals, and O-rings
• Suitable for professional rebuilds and DIY maintenance

Part Number Cross-Reference

Use this table to confirm equivalent part numbers across OEM and aftermarket brands.

Compatible Engine Models

Confirm your engine model/year in the table below. For Yamaha owners, here's a guide to help you identify your engine's serial/model: Yamaha Serial Number Guide. You can also review exploded diagrams to verify part numbers: Yamaha Parts Diagrams & Catalog.

Technical Specifications

Package Contents

This complete gasket repair kit includes the following components:

• 1 × Head Gasket (6H3-11181-00)
• 1 × Intake Gasket (6H3-13622-00)
• 1 × Exhaust Outer Cover Gasket (6H3-41114-00)
• 1 × Exhaust Inner Cover Gasket (6H3-41112-00)
• 1 × Thermostat Cover Gasket (62Y-12414-00)
• 1 × Upper Casing Gasket (6H3-45113-00)
• 1 × Fuel Pump Mounting Gasket (650-24431-00)
• 1 × Valve Seal Gasket (6H3-13621-00)
• 1 × Cylinder Cover Gasket (6H3-11193-00)
• 1 × Drain Screw Gasket (90430-14115)
• 3 × Gasket, Float Chamber
• 4 types of O-rings
• 3 types of Oil Seals

Installation Guide

1. Preparation: Disconnect the battery and drain all fluids from the powerhead. Remove the cowling and any components obstructing access to the powerhead.
2. Disassembly: Carefully remove the cylinder head, exhaust covers, thermostat housing, and upper casing following your engine's service manual torque sequence in reverse.
3. Surface Cleaning: Thoroughly clean all mating surfaces using a gasket scraper and solvent. Ensure no old gasket material, carbon deposits, or debris remain.
4. Inspection: Check all surfaces for warping, cracks, or damage. Resurface or replace components as needed before proceeding.
5. Gasket Placement: Position the new head gasket on the block, aligning all bolt holes and water passages carefully. Do not use sealant unless specified by the manufacturer.
6. Head Installation: Install the cylinder head and torque bolts to specification in the correct sequence (consult your service manual). Work in multiple passes from center outward.
7. Seals & O-rings: Replace all O-rings and oil seals included in the kit, lubricating them lightly with engine oil before installation.
8. Cover Assembly: Install intake, exhaust, and thermostat cover gaskets, ensuring proper alignment. Torque fasteners to specification.
9. Upper Casing: Position the upper casing gasket and reassemble the lower unit connection, following torque specifications.
10. Fuel System: Install the fuel pump mounting gasket and float chamber gaskets, ensuring a proper seal to prevent fuel leaks.
11. Final Assembly: Reinstall all removed components, refill fluids, and reconnect the battery.
12. Testing: Start the engine and check for leaks, proper compression, and smooth operation. Monitor for any abnormal sounds or leaks during the first few hours of operation.

Troubleshooting & FAQ

Q: How do I confirm this gasket kit fits my specific Yamaha engine?
A: Verify your engine model and year against the compatibility table above. Cross-reference the OEM part number 6H3-W0001-02-00 with your engine's parts diagram to ensure exact fitment before ordering.

Q: How often should I replace the powerhead gaskets?
A: Replace gaskets whenever you perform a powerhead rebuild, cylinder head removal, or if you notice compression loss, coolant leaks, or oil mixing with water. Routine replacement is typically during major engine overhauls or every 5-10 years depending on usage.

Q: What are the signs that my powerhead gaskets are failing?
A: Common symptoms include loss of power, overheating, white smoke from the exhaust, coolant in the oil, oil in the coolant, external coolant or oil leaks around the head or covers, and difficulty starting.

Q: Do I need to use sealant with these gaskets?
A: Most gaskets in this kit are designed to seal without additional sealant. However, consult your Yamaha service manual for specific recommendations—some applications may require a thin coat of marine-grade sealant on certain surfaces.

Q: Can I reuse gaskets if I'm just inspecting the powerhead?
A: No, gaskets should never be reused once removed. They compress and conform to mating surfaces during installation and will not seal properly if reinstalled, leading to leaks and potential engine damage.

Q: OEM vs. Aftermarket?
A: This listing is an aftermarket replacement part (not an OEM component). We build to OEM specifications using comparable-grade materials. Production is done in an ISO9002-certified facility, and each batch is inspected for consistent performance.

Q: How fast do you ship and how much does it cost?
A: We offer fast global shipping—typically 5–15 days worldwide—and standard shipping is free. Expedited options are available at checkout depending on your location.

Q: What is your warranty and return policy?
A: This product includes a 1-year warranty against manufacturing defects under normal use. If something goes wrong, contact our support team with your order details. Returns are accepted within our standard return window (unused & in original condition); please see our policy page or reach out for instructions.

Important Notes

• Verify that the product images and specifications match your original part. If discrepancies exist—even if your model is listed—do not proceed with the purchase.
• This product is an aftermarket replacement part and is not an OEM component.
• Professional installation is recommended to ensure safety and optimal performance.

Why Choose JLM MARINE?

• Quality Assured: As a trusted manufacturer for over 20 years, we supply top marine brands globally.
• Fast Global Shipping: Free delivery worldwide in 5–15 days.
• Direct from Manufacturer: Competitive pricing without compromising quality.