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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Jason W
Cuba, US
★★★★★ 5
This is one “under the radar” gem!!
Size: Large, Color: Coral
This is one “under the radar” gem!! Very strong internal squeaker and way tougher than it looks. My big 125lb Shepard-Husky mix gave it heck, then made it his new buddy. He’ll occasionally give it the business but on the whole, it’s surprisingly tough and my big boy loves it. Nice price!!
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Reviewed in the United States on May 10, 2026
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H
Cuba, US
★★★★★ 4
Cute but small
Size: Large, Color: Skinny Green
Cute stuffy and has not yet ripped. While my dogs plays with it, the toy is a bit small for him. For reference he is 120lbs.
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Reviewed in the United States on May 27, 2026
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Jenny J
Pawtucket, US
★★★★★ 5
My Puppy Loves this Indestructible Dragon
Size: Large, Color: Pink, Size: Large, Color: Pink
My puppy (8 month old black lab mix) loves, loves, loves her dragon. She has had it for 2 months now. It is one of her favorites and gets daily rough play time. It's her go-to toy for fetch and tug games, as well as just general mouthy play. The squeaker gave out after about 4 weeks, but she would binge squeak for prolonged periods (kind of like chomping on gum) so it was almost a blessing when it went silent. She still chomps on it, but at least now I don't have to hear it. Other than the fact that it's a little grungy and bedraggled from so much loving, it is still in amazing shape. The seams and fur are all still intact. There are no visible holes, rips, or weak spots. I love Chew Guard Technology. This dragon replaced her goDog Iguana (from PetSmart) that developed a tear in the fur after about 4 months of heavy use. (It was superficial, just the outer fur layer and not the innards, but we disposed of it before she could eat more fur.) She can be pretty rough on her toys and I can never predict if any given toy will last minutes or months. The goDog stuffies definitely fall into the "months" category, even with rough daily use. Edit: The dragon lasted about 6 months of intensive, hard play before it developed a small tear in the fur. I patched it a couple times, but once my pup discovers a weak spot, it's the kiss of death for any stuffed item. We had to dispose of the dragon (so sad) to keep her from eating any more of the fur. We replaced the dragon with the goDog Chameleon, which is still going strong. I think we will go back to the dragon for our next toy because it's just so darned cute. We gave the dragon to my niece for her golden retriever puppy who is very chew-happy. That dragon is also doing well. You've just gotta love that chew-guard technology. This is one tough toy.
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Reviewed in the United States on September 26, 2015
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Mother of two
Dallas, US
★★★★★ 5
Precious toy for big dogs too
Size: Large, Color: Skinny Green
Not only is this toy cute and fun, but material is thick and durable even for my crazy GSP who is a destruction artist. This is, the favorite toy his go to in the toy box.
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Reviewed in the United States on May 15, 2026
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VanillaPepper
Phoenix, US
★★★★★ 5
Indestructible Toys My Dobermans ❤️
Size: Large, Color: Mesh Green
Actually Respect! goDog Is a Lifesaver The variety of size and colors are phenomenal 😇 I have two Dobermans — serious, determined power chewers — and I’ve spent years trying to find toys that survive even a few days. I’ve tried the big brands (Kong, Goughnuts, Jolly Ball, you name it) — and while some toys last a little while, almost everything eventually ends up shredded, de-squeaked, or in pieces. goDog toys are the ONLY plush toys my Dobermans won’t destroy. We own multiple goDog toys now — dragons, dinosaurs, lizards — mostly in the large size (perfect for Dobermans), but even a few medium-sized ones hold up surprisingly well. Here’s what’s amazing: • They love them — actually carry them around, toss them, chew them gently, and squeak them happily. • They do not rip them apart — no matter how much tugging, chewing, or wrestling happens. • Large sizes are best for Dobermans (and other big breeds) — but even mediums survive for calmer play sessions. • No ripped seams, no stuffing everywhere, and no destroyed squeakers after months of use. What makes goDog toys different? The secret is their Chew Guard Technology — • A reinforced, high-strength inner mesh layer under the soft plush • Double-stitched seams • Durable yet flexible material that somehow resists punctures, tears, and brutal shaking The outside stays soft and fun, but the inside is built like armor. It’s NOT a super hard rubber or rough canvas — it still feels like a cuddle toy, but it’s engineered to survive serious chewing. Materials include: • Durable polyester plush • Chew Guard inner lining (high-tensile mesh fabric) • Reinforced stitching • Non-toxic squeakers • Safe for dogs to play with long-term Real Owner Advice: • Always size up if you have a heavy chewer — large sizes are a must for Dobermans or similarly strong breeds. • Medium sizes are fine if you supervise or your dog is more moderate with toys, but the large toys are built tougher overall. Final Thoughts: If you have big dogs, strong jaws, or just tired of wasting money on destroyed toys — goDog toys are a must. No other plush-style toy even comes close. My Dobermans will destroy almost anything… but they treat their goDog toys like treasured companions. No holes, no rips, just happy dogs. Follow me here on Amazon for more honest, dog-tested reviews! Like this review if it helped — I’ll be uploading even more proven tough toys and pet essentials soon!
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Reviewed in the United States on April 29, 2025

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