SKU: 86661371336

689-11181-00 Cylinder Head Gasket for Yamaha Mercury Mariner C30 30A W30 | JLM Marine

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Description

689-11181-00 Cylinder Head Gasket for Yamaha Mercury Mariner C30 30A W30 | JLM MarineCylinder Head Gasket Fits Yamaha & Mercury Mariner 2 Stroke 2530 HP Outboards This aftermarket cylinder head gasket is engineered for Yamaha and Mercury Mariner 2 stroke outboard engines rated at 2530 HP. It is designed to fit models including Yamaha C30 and 30A, as well as Mercury Mariner 30A and W30 with 2 cylinder, single carburetor configurations. Built to OEM specifications, this gasket ensures a reliable seal between the cylinder head and block,

Cylinder Head Gasket – Fits Yamaha & Mercury Mariner 2-Stroke 25–30 HP Outboards

This aftermarket cylinder head gasket is engineered for Yamaha and Mercury Mariner 2-stroke outboard engines rated at 25–30 HP. It is designed to fit models including Yamaha C30 and 30A, as well as Mercury Mariner 30A and W30 with 2-cylinder, single-carburetor configurations. Built to OEM specifications, this gasket ensures a reliable seal between the cylinder head and block, preventing combustion leaks and maintaining optimal engine performance.

This gasket directly replaces multiple OEM part numbers across Yamaha and Mercury Mariner systems, including Yamaha 689-11181-00 and Mercury 27-19138M. It offers broad compatibility with legacy part numbers, ensuring you can confidently service older or discontinued engine models without sourcing hard-to-find original components.

  • Direct replacement for Yamaha 689-11181-00 and Mercury 27-19138M part numbers
  • Designed for 2-stroke, 2-cylinder engines with single carburetor
  • Ensures proper compression and prevents coolant/oil mixing

Part Number Cross-Reference

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

Brand Part Number
Yamaha 689-11181-00
Yamaha 689-11181-A2-00
Yamaha 689-11181-A1-00
Yamaha 689-11181-A0-00
Yamaha 689-11181-01-00
Yamaha 689-11181-02-00
Mercury Mariner 27-19138M
Mercury Mariner 19138
Mercury Mariner 27-84733M
Sierra 18-3804

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.

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

Brand Model Rated HP Stroke Notes
Yamaha C30 25–30 HP 2-Stroke 2-cylinder, single carburetor, S/N 689...
Yamaha 30A 30 HP 2-Stroke 2-cylinder, single carburetor, S/N 689...
Yamaha W30 30 HP 2-Stroke 2-cylinder, single carburetor, S/N 689...
Mercury Mariner 30A 30 HP 2-Stroke 2-cylinder, single carburetor, Japan models, S/N 689...
Mercury Mariner W30 30 HP 2-Stroke 2-cylinder, single carburetor, Japan models, S/N 689...

Technical Specifications

Specification Value
Part Type Cylinder Head Gasket
Application Yamaha & Mercury Mariner 2-Stroke Outboards
Engine Configuration 2-Cylinder, Single Carburetor
Horsepower Range 25–30 HP
Stroke Type 2-Stroke
OEM Reference 689-11181-00

Package Contents

  • 1 × Outboard Cylinder Head Gasket

Installation Guide

  1. Disconnect the battery and allow the engine to cool completely before beginning work.
  2. Remove the engine cowling and label all electrical connections for easy reassembly.
  3. Detach fuel lines and control cables from the cylinder head area. Cap open fuel lines to prevent spills.
  4. Unbolt and lift off the cylinder head carefully, noting the positions of all fasteners.
  5. Remove the old gasket and thoroughly clean both the cylinder head and block mating surfaces. Use a gasket scraper and solvent; ensure no residue or debris remains.
  6. Inspect the cylinder head for warping or cracks using a straight edge. Replace or resurface if necessary.
  7. Position the new gasket on the block, aligning all bolt holes and coolant passages precisely.
  8. Reinstall the cylinder head and hand-tighten all bolts to ensure proper seating.
  9. Torque the head bolts in a cross-pattern sequence to manufacturer specifications (consult your service manual).
  10. Reconnect fuel lines, control cables, and electrical connections in reverse order of removal.
  11. Refill coolant (if applicable) and check for leaks before starting the engine.
  12. Start the engine and inspect for proper compression, coolant leaks, and smooth operation. Re-torque head bolts after initial run-in if recommended.

Troubleshooting & FAQ

Q: How do I confirm this gasket fits my engine?
A: Cross-reference your engine's model number and serial number with the compatibility table above. Verify that your engine is a 2-stroke, 2-cylinder configuration with a single carburetor and matches the listed HP range (25–30 HP).

Q: What are the signs that my cylinder head gasket needs replacement?
A: Common symptoms include loss of compression, overheating, white smoke from the exhaust, coolant mixing with oil, external coolant or oil leaks near the head, and rough idling or misfires.

Q: Can I reuse the old gasket if it looks intact?
A: No. Cylinder head gaskets are designed for single use. Reusing an old gasket—even if it appears undamaged—can result in improper sealing, leaks, and engine damage.

Q: Do I need to resurface the cylinder head before installing this gasket?
A: Inspect the cylinder head with a straight edge. If warping or damage is present, resurfacing is required. Clean, flat mating surfaces are essential for a proper seal.

Q: How often should I replace the cylinder head gasket?
A: Replace the gasket any time the cylinder head is removed for service, repair, or inspection. Regular replacement intervals are not specified, but symptoms of failure (overheating, leaks, compression loss) indicate immediate replacement is needed.

Q: Is this an OEM or aftermarket part?
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.
Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 86661371336

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andrea cicalo
Grantham, US
★★★★★ 4
Perfect for what I needed - getting a 2nd one.
Color: Black, Size: 22" - 4 Panel
Putting it together was a BEE-OTCH!! Yes, one of the tubes had the top cap installed at the wrong end (& getting it off required tools), and yes, stretching the fabric to get the screws in was incredibly hard...but am I buying another one? YES! After all is said and done, this is a great room divider. I opted out of installing the paddle feet & it still works perfect. It won't filter light all that great and even though it stands on its own, it can be blown over easily - but for the price? Excellent. If I wanted a heavy duty, thicker, more expensive one, I would've bought one. The 2nd one is on the way. Perfect height, no weird smell, nice and light and easy to move around.
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Reviewed in the United States on September 30, 2025
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Diana Walls
Los Angeles, US
★★★★★ 5
WHERE HAVE YOU BEEN 😊
Color: Grey, Size: 34" - 3 Panel
I purchased RANTILA 3 Panel Room Divider, 6 Ft Tall Folding Privacy Screen Freestanding Room Partition Wall Dividers, 102''W x 20''D x 71''H, Grey. For outdoor use on my patio is perfect . PRIVACY!!! YAY! It was packaged very carefully. There were no missing parts. Instructions were there but I still had to use the video visually. A few screws would not screw in. So I used a hammer with a few good taps that helped using the screw driver. 😊 It was easy putting it together following the directions. Everything is well made. Love the height, functionality and it’s definitely light it works. Thank you
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Reviewed in the United States on June 7, 2025
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Ellen W.
Louisville, US
★★★★★ 5
I am happy with the room divider. It does what I intended.
Color: Beige, Size: 34" - 3 Panel
Use a power screwdriver.
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Reviewed in the United States on April 25, 2026
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Michele Parkinson
Bozeman, US
★★★★★ 3
It’s really pretty decent except for one thing.
Color: Grey, Size: 34" - 4 Panel, Color: Grey, Size: 34" - 4 Panel
I bought two of these for my basement and they do look great. They were easy to assemble and I’m happy with them. The problem is that the stitching on the fabric panels are almost the size of a machine basting stitch (which for non sewers means large temporary stitches). Because the panels are tight by design, the stitches had already started to come undone before I could finish assembling everything. Fortunately I can sew and I reinforced all the panels. I had to take the first ones back off the poles to do them but I did the second set before assembling. It’s really not a bad product for the money. It’s quality fabric and the design itself looks great. The stitching looks fine but it’s just not substantial enough for the purpose it is supposed to serve. I can’t imagine why it be sewn so insufficiently. I was able to resolve my issue because I can sew. I wasn’t planning on sewing nor did I really have the time. I could have made it myself but I didn’t want to and that is why I purchased this. I ended up using valuable time. The really unfortunate thing is, I have no other complaints. This is a manufacturing problem.
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Mad Jack
Lexington, US
★★★★★ 5
Inexpensive walls.
Color: Grey, Size: 34" - 3 Panel, Color: Grey, Size: 34" - 3 Panel
We had a hot request for a workstation in the warehouse with some privacy. These have worked great. Easy to assemble. They are lightweight and stable. This was an inexpensive solution that looks professional. Our client loved it.
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Reviewed in the United States on August 1, 2025

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