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Description
Full Flow Dry Joint Exhaust Elbow Gasket – Fits MerCruiser V6 & V8 (Replaces 27-864547A02, 864547A1)Full Flow Dry Joint Exhaust Elbow Gasket Fits MerCruiser V6 & V8 This full flow dry joint exhaust gasket is designed for MerCruiser 4. 3L, 5. 0L, 5. 7L, 6. 2L, and 6. 3L V6 and V8 stern drive and inboard engines manufactured in 2002 and newer. It provides a reliable seal between the exhaust manifold and the elbow riser. This part is a direct replacement for MerCruiser part numbers 27 864547A02 and 864547A1, as well as Sierra 18 0721. Gasket Style:
Full Flow Dry Joint Exhaust Elbow Gasket – Fits MerCruiser V6 & V8
This full flow dry joint exhaust gasket is designed for MerCruiser 4.3L, 5.0L, 5.7L, 6.2L, and 6.3L V6 and V8 stern drive and inboard engines manufactured in 2002 and newer. It provides a reliable seal between the exhaust manifold and the elbow/riser.
This part is a direct replacement for MerCruiser part numbers 27-864547A02 and 864547A1, as well as Sierra 18-0721.
- Gasket Style: Full Flow (Open) for standard cooling systems.
- Installation Type: Designed specifically for dry joint exhaust systems.
- Material: Constructed from durable metal to withstand the harsh marine environment.
Part Number Cross-Reference
Use this table to confirm equivalent part numbers across OEM and aftermarket brands.
| Brand | Part Number |
|---|---|
| MerCruiser | 27-864547A02 |
| MerCruiser | 864547A1 |
| Sierra | 18-0721 |
Compatible Engine Models
Confirm your engine model/year in the table below.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| MerCruiser | 350 MAG | Various | 4-Stroke | 2002 and newer | 27-864547A02 | Dry joint exhaust manifolds only |
| MerCruiser | 4.3L | Various | 4-Stroke | 2002 and newer | 27-864547A02 | Dry joint exhaust manifolds only |
| MerCruiser | 5.0L | Various | 4-Stroke | 2002 and newer | 27-864547A02 | Dry joint exhaust manifolds only |
| MerCruiser | 5.7L | Various | 4-Stroke | 2002 and newer | 27-864547A02 | Dry joint exhaust manifolds only |
| MerCruiser | 6.2L | Various | 4-Stroke | 2002 and newer | 27-864547A02 | Dry joint exhaust manifolds only |
| MerCruiser | 6.3L | Various | 4-Stroke | 2002 and newer | 27-864547A02 | Dry joint exhaust manifolds only |
Technical Specifications
| Specification | Value |
|---|---|
| Product Type | Exhaust Elbow/Riser Gasket |
| Installation | Dry Joint Type |
| Gasket Style | Full Flow (Open) |
| Material | Metal |
| Shape | Rectangular |
| Application | Exhaust Manifold to Elbow/Riser |
| Engine Type | V6 & V8 MerCruiser Stern Drive and Inboard Engines |
| Engine Compatibility | 4.3L, 5.0L, 5.7L, 6.2L, 6.3L |
| Engine Year Range | 2002 and newer |
| Warranty | Varies by manufacturer (typically 1-2 years) |
Package Contents
- 1 x Dry Joint Gasket Open (27-864547A02)
Installation Guide
- Ensure the engine is completely cool and disconnect the battery.
- Drain the engine coolant from the exhaust manifold to a level below the riser joint.
- Unbolt and carefully remove the exhaust elbow/riser from the manifold.
- Thoroughly clean both mating surfaces. Remove all traces of old gasket material, rust, and debris until the surfaces are smooth and bare.
- Position the new dry joint gasket onto the manifold, ensuring it is correctly aligned with the bolt holes and passages.
- Reinstall the exhaust elbow/riser. Hand-tighten the bolts first, then torque them to the manufacturer's specified sequence and values.
- Refill the cooling system, reconnect the battery, and start the engine.
- Carefully inspect the gasket area for any signs of water or exhaust leaks.
Troubleshooting & FAQ
Q: Is this gasket for catalyzed or non-catalyzed engines?
A: This is a full flow (open) gasket, typically used on engines without catalytic converters. Engines with catalytic converters often require a restricted gasket (with a smaller opening) to create appropriate backpressure. Always match the new gasket to your original part.
Q: What are the signs my exhaust elbow gasket has failed?
A: Common symptoms of a failed gasket include external water leaks from the joint between the manifold and riser, engine overheating, or a loss of performance. In severe cases, it can lead to water intrusion into the cylinders, causing significant engine damage.
Q: Do I need to use sealant with this gasket?
A: No. Dry joint gaskets are designed to be installed dry. The use of sealant can interfere with the seal and may cause premature failure. Ensure both mating surfaces are perfectly clean and flat before installation.
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.
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- 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
4.4 ★★★★★
Based on 12 reviews
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Product Reviews
★★★★★ 5
Replacement unit working better than the original
Size: C20, Size: C20
EDIT: Replacement unit working better than the original! The seller offered a full refund, and since I had another vacuum of there's (different model) that didn't have any of the same problems, I asked for a replacement instead. The other vacuum has been great! Replacement was in hand shortly after returning the defective unit. None of the same issues as the original. It's not like this is the greatest robot vacuum ever invented, but for the price this is a rock solid vacuum and mop that's now been keeping our floor spotless for more than 2 months! I feel bad for the old vacuum... :-( I've worked in manufacturing before, so I know you'll have a dud unit every so often. Unfortunately, I received one of those. Fortunately, Eufy seems to be a company that stands by it's products. I'm very pleased with the quality of their customer service and of the replacement unit.
ORIGINAL: No longer runs: Laser sensor malfunction after just 5 months. This product was maybe 3 out of 5 to begin with. It didn't do a very good job at avoiding cables or animals. Nor did it do a good job at getting corners, but it did run when scheduled. After just 5 months, it rolls out from the station and stops. I get a notification that the Laser sensor may be blocked. There's nothing blocking the sensor. I've cleaned the lens, and the issue still persists.
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Reviewed in the United States on October 17, 2025
★★★★★ 3
My Experience With The C20
Size: C20
Initial Performance (First 3–4 Months)
For the first three to four months, the Eufy C20 worked exactly as advertised. It kept the entire first floor of my home—100% tile—spotless. Navigation was smooth, battery life was consistent, and it completed full cleaning cycles without issues. During this period, I was very satisfied with its performance.
Battery & Performance Decline
After about four months, the battery life and overall reliability started to decline noticeably. The robot began dying in random locations instead of returning to the dock when the battery was low. At times, it would simply stop in the middle of a cleaning cycle and remain in place until the battery was completely drained, forcing me to manually pick it up and return it to the dock.
Navigation & Software Issues
The navigation system also became unreliable over time. The robot would occasionally lose track of where it was, run headfirst into walls or corners, and fail to properly reroute itself. Pressing the home or power button to resume a task was inconsistent—sometimes it would restart, other times it would just sit there unresponsive.
Home Environment & Maintenance
My home does not have large carpets or difficult obstacles, so there’s no clear environmental reason for these issues. I also perform weekly to bi-weekly maintenance on the robot, including cleaning sensors and components, but this has not resolved the ongoing problems.
Overall Verdict
Overall, the Eufy C20 is a decent robot vacuum/mop for short-term use, but based on my experience, it does not hold up well long-term. I expected at least a full year of reliable performance, but the noticeable decline after only four months was disappointing, especially when paying over $400 for the product. It’s a good option for temporary or light use, but I would hesitate to rely on it as a long-term cleaning solution. Hopefully the warranty will cover whatever malfunctions the device is going through.
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Reviewed in the United States on December 9, 2025
★★★★★ 2
Not worth it
Size: C20
In the beginning I thought this vacuum was great. The longer I use it the more annoyed I am. At this point I often find myself using my old cannister vacuum or broom and manually mopping despite having a several hundred dollar appliance that is supposedly nearly autonomous in these tasks. Customer service has been mostly useless and often concludes the vacuum is working as it should. If this is the best it is intended to work, that's an issue.
Here are the problems I've noticed:
1. Many moving parts on the underside of the robot end up winding up human hair and other debris. In most of these places, it isn't possible to disassemble to the point of easily pulling out the hair. I desire to run the vacuum once weekly for a ~1400 sq ft apartment and at this rate, once or twice a month I need to be picking at the component parts with the tip of a knife to try to wrestle the hair tourniquets off of where its wound up. If I don't do that, the vacuum is incredibly squeaky and loud.
2. Debris accumulates in the base station tray and clogs it up such that base station needs to be cleaned regularly or else the mops stay too wet and do not dry. Again this is a once or twice per month task. Otherwise you could run an entire dry cycle on the mops and still come out with soaking wet mops. Do I remember to check the mops every time to make sure they did indeed dry? No, so then soggy nasty mops sit there for a long time. Kind of defeats the purpose of self washing and drying.
3. Possibly related to the above or not, I really can't tell -- the mops start out too wet and leave little puddles that dry into unsightly water spots on the floor when it first begins mopping. Then it quickly loses all water and seems to be doing basically nothing. Adjusting the frequency of return helps slightly with the second problem but not the first, and I end up passing over with a manual mop every time to clear standing water and eliminate water spot stains.
4. Poor emptying of dustbin resulting in poor suction and accumulation of debris at the site of the base station. Seriously, half the time even on turbo suction this vacuum LEAVES more dust on rugs in its wake than it picks up. I can clean my doormat better with a quick sweep with the broom. When it gets back to the base station to empty, half the time it flings debris out from the base station at high speed and I have to sweep up its mess. Manually emptying the on-board dust bin helps, but isn't supposed to be necessary -- this thing is allegedly self emptying and certainly makes quite enough sound during the emptying phase to have you believe it is emptying the dustbin. Add one more once or twice monthly maintenance requirement that isn't supposed to be needed.
5. Dustbunnies, rather than getting sucked up, attach to various parts of the bottom of the vacuum contributing to other problems described above. As soon as it goes over a rug, the rug pulls all the dustbunnies off, now they are on your rug instead of the wood floor. If the vacuum makes it back to the base station with the dustbunnies attached, now they are clogging up the mop tray.
6. Sometimes cannot figure out how to reseat itself at home base. It finds the base station, then just gets stuck in a loop of rearing up and heading towards it and missing. I have to sometimes out it back to charge manually.
All in all, it really needs a lot of attention for what is meant to be a pretty independent machine. Customer service flat out told me the mopping is functioning as expected. Gross, I don't know why you would think any customer wants puddles of water left behind that can damage wood floors or leave unsightly stains, but ok. Only ever offered to send a replacement vacuum if I pack this one up to return. If it's working properly, I don't want a replacement, I want a refund! Let me go back to my old cannister vacuum and hand mop in peace. Maybe the models at higher price points are better without these issue; I wouldn't know.
Edited to add, the manufacturer reached out to me and was able to set me up to try out the S1 ad an alternative due to these concerns. I am bumping the review from one star to 2 for the strong customer service. In my opinion, the S1 is a much stronger performing vacuum/mop combo.
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Reviewed in the United States on September 28, 2025
★★★★★ 5
Good buy
Works well with my Eufy C10, very easy to install
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Reviewed in the United States on March 26, 2026
★★★★★ 1
Filter is too small for full coverage
Filters are not the correct size, too small. Not worth the risk.
Brush arm bristles were also all bent up.
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Reviewed in the United States on May 13, 2026
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