SKU: 5969714595

30-803100T1 Transom Seal Kit for MerCruiser Bravo I II III | JLM Marine

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Description

30-803100T1 Transom Seal Kit for MerCruiser Bravo I II III | JLM MarineTransom Seal Kit for MerCruiser Bravo I, II, III Direct Replacement for 30 803100T1 This comprehensive transom seal kit is engineered for MerCruiser Bravo I, II, and III sterndrive applications from 1982 and up. Designed to meet or exceed OEM specifications, this complete reseal repair kit provides all the essential bellows, bearings, gaskets, and hardware needed to restore your transom assembly to peak performance. Direct Replacement for: Mercury 30

Transom Seal Kit for MerCruiser Bravo I, II, III – Direct Replacement for 30-803100T1

This comprehensive transom seal kit is engineered for MerCruiser Bravo I, II, and III sterndrive applications from 1982 and up. Designed to meet or exceed OEM specifications, this complete reseal repair kit provides all the essential bellows, bearings, gaskets, and hardware needed to restore your transom assembly to peak performance.

Direct Replacement for: Mercury 30-803100T1, 8M0095485 | Sierra 18-8219. This aftermarket kit delivers OEM-grade quality at a competitive price, ensuring reliable protection against water intrusion and exhaust leaks.

  • Complete reseal kit with U-joint bellows, exhaust bellows, shift bellows, gimbal bearing, water hose, and all necessary gaskets and clamps
  • Stainless steel bellows clamps included for secure, corrosion-resistant installation
  • Fits MerCruiser Bravo One, Bravo Two, and Bravo Three sterndrives (1982 & up)

Part Number Cross-Reference

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

Brand Part Number
Mercury 30-803100T1
Mercury 8M0095485
Sierra 18-8219

Compatible Engine Models

Confirm your engine model/year in the table below. 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 Years
MerCruiser Bravo One 1982 & UP
MerCruiser Bravo Two 1982 & UP
MerCruiser Bravo Three 1982 & UP

Technical Specifications

Specification Value
OEM Part Number 30-803100T1
Application MerCruiser Bravo I, II, III Sterndrives
Fitment Years 1982 & Up
Clamp Material Stainless Steel

Package Contents

This transom bellow reseal repair kit includes the following components:

  • U-joint Bellows – #86840A05
  • Exhaust Bellows – #78458A1 & 18654A1
  • Shift Bellows – #74639A2
  • Gimbal Bearing – #30-862540A3
  • Water Hose – #32-43437
  • Mounting Gasket & O-rings – #16755Q1
  • Stainless Steel Bellows Clamps

Installation Guide

  1. Disconnect the battery and ensure the engine is off and cool. Remove the drive unit from the transom assembly according to your MerCruiser service manual.
  2. Inspect the transom plate and gimbal housing for corrosion, cracks, or damage. Clean all mating surfaces thoroughly and remove old gasket material.
  3. Remove the old gimbal bearing using a bearing puller or press. Install the new gimbal bearing (#30-862540A3) with a bearing driver, ensuring it is fully seated and aligned.
  4. Install the new mounting gasket and O-rings (#16755Q1) onto the gimbal housing. Apply a light coating of marine grease to the O-rings to aid installation.
  5. Attach the U-joint bellows (#86840A05) to the gimbal housing and driveshaft yoke. Secure both ends with the supplied stainless steel clamps, ensuring they are tight and properly positioned in the grooves.
  6. Install the exhaust bellows (#78458A1 & 18654A1) between the transom plate and drive unit. Route it carefully to avoid kinks or pinching, then secure with clamps.
  7. Attach the shift bellows (#74639A2) over the shift cable assembly. Ensure it is fully seated on both ends and clamp securely.
  8. Connect the water hose (#32-43437) to the fittings on the transom assembly and drive unit. Tighten clamps to prevent leaks.
  9. Reinstall the drive unit onto the transom assembly, aligning the driveshaft and shift cable. Torque all mounting bolts to manufacturer specifications.
  10. Inspect all bellows and connections for proper seating and clamp tightness. Verify that no bellows are twisted or pinched.
  11. Reconnect the battery and perform a visual inspection before launching. Run the engine briefly on a hose or in the water to check for leaks or abnormal operation.
  12. Test the steering, shift, and throttle operation before taking the boat underway. Monitor for leaks during the first few hours of use.

Troubleshooting & FAQ

Q: How do I know if my transom bellows need replacement?
A: Inspect bellows regularly for cracks, tears, dry rot, or water intrusion inside the bilge near the transom assembly. If you notice water leaking into the boat, exhaust fumes in the bilge, or visible damage to the rubber, replace the bellows immediately to prevent engine or transom damage.

Q: Can I replace just one bellows instead of the entire kit?
A: While individual bellows can be replaced, it is recommended to replace all bellows, gaskets, and the gimbal bearing together during a transom reseal. This ensures all components are fresh and reduces the likelihood of repeat service calls due to failure of other aging parts.

Q: How often should I replace the transom bellows and gimbal bearing?
A: Inspect bellows annually and replace them every 3–5 years or sooner if cracks or deterioration appear. Gimbal bearings should be replaced if you feel roughness, binding, or hear noise during steering, or as part of a comprehensive transom reseal every 5–7 years.

Q: Will this kit fit my Bravo drive if it was manufactured before 1982?
A: This kit is designed for MerCruiser Bravo I, II, and III drives from 1982 and up. If your drive is older or a different model (e.g., Alpha, R, MR), verify compatibility with your parts manual or contact our support team before purchasing.

Q: Do I need any special tools to install this transom seal kit?
A: You will need basic hand tools, a torque wrench, a bearing puller/driver set for the gimbal bearing, and marine grease. A service manual for your specific MerCruiser model is highly recommended for torque specifications and alignment procedures.

Q: What is the difference between OEM and aftermarket transom seal kits?
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: 5969714595

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Jack & Ann Kenny
Waukegan, US
★★★★★ 5
Nice Product and Customer Service
I ordered this BlastIR Wireless Pro IR Repeater from Sewell to replace a wired version of an IR repeater from another company. We have moved our TV on to a wall location and are in the process of hiding all the wiring out of sight behind walls and/or in a cabinet. We still have some wires to go, but this product has enabled us to eliminate the IR wiring all together. It's a real improvement in both looks and performance over the cheaper, wired version we originally tried. The BlasterIR's Receiver is the component that faces the room and receives the IR signal from our remote controls. It's small enough to fit in the space between our sound bar and the bottom of the TV. It's range is great for our room size (about 22' long and 18' wide) and picks up the remotes signal from a side angle that's almost parallel to the TV itself. The receiver is powered through one of the USB ports integrated into the TV (although the device itself supports either a USB or regular plug-in option). I haven't used them yet but Sewell appears to have provided a few options to help with affixing the IR devices in their final positions including some adhesive pads and a magnetic pad option as well. I'm still playing around with the permanent placement of the IR Blaster Emitter. It sits inside a closed cabinet and faces the concealed cable box receiver, router and DVR components. It retransmits the various IR signals it receives from the IR receiver by blasting that signal to anything it faces. I just placed it in the cabinet about 5" away from the devices I wanted to control, plugged it in and it worked with no other set up. So far the BlastIR is working seamlessly and with much better function response time than the cheaper IR version we'd tried at first. The lag time between when a button is pressed on the remote control and the action taking place on the device I'm communicating with is minimal. The emitter itself is plugged into an outlet on a surge protector powering the other in-cabinet devices, although it too could be powered via the provided USB connection if desired. As a note, we did experience a shipping issue during our ordering process. The order it self was processed quickly and shipped in a timely manner. However, there was an issue with our actual receipt of the product and the USPS who reported it delivered to our mailbox when in fact it had not been. Regardless, we reached out to Sewell directly and they quickly resolved the issue for us with no problems and in a timely manner. I would recommend both this IR Blaster Pro product as well as Sewell as a trusted company itself.
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Reviewed in the United States on February 8, 2021
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Scott C
Draper, US
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Does NOT Transmit Through Walls
Quick and easy setup! Works great within the room. However, will not work effectively between walls (i.e. - AV closet to living room).
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Reviewed in the United States on February 8, 2026
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HSNYC
Lake Worth, US
★★★★★ 5
Works perfectly - great product
My MBR TV set-up incorporates a cable box set up in a closet about 50 feet from the TV (hung over a fireplace). When it was set up the A/V used a wired infra-red set up that was wired thru the walls, under the floor, into the closet. Unfortunately some mice nibbled on the wiring and it does not work. I have tried everything including the Next Generation extender (over the years bought 6 of them for different TV's) and most recently the Startech. The Next Generation have not been updated in years and over time completely lose their ability to operate. No customer service at all; emails go into a black hole. I had high hopes for the Startech. Easy to set up and worked out of the box. The problem is the lag time. I could live with it when watching live TV, but it was totally impossible when it came to playing back programs from the DVR (which is cloud based). I was losing hope until I tried the Sewell Blaster. Took me less then 5 minutes to set up and it worked instantly. Little or no lag to speak of and I couldn't be happier. NB. Speaking of Sewell, the absolutely BEST way to control your HDMI based TV is the Sewell Direct SW-30062 Dual Band InjectIR sold by Amazon for $55. This is truly plug 'n play and operates with absolutely no lag. Bought 2 of these to operate TV's in my apartment where I had to hide boxes in closets. Well made, great instructions (coordinated with the devices) and I just love this product. I bought mine direct from Sewell ) same price) because I couldn't find them on Amazon when I needed them, but they have a great return policy and I'm told great C/S. If you can't use these then go for the Blaster.
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Reviewed in the United States on November 30, 2018
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Battle Creek, US
★★★★★ 5
This vacuum is totally worth the extra money! I LOVE MY YELLOW VAC!
Configuration: Vacuum
Don't hesitate to spend a few more dollars on this vacuum, because you won't be sorry over time. I had done extensive research on purchasing my next vacuum when I came across this model. A friend owns one of the dark green limited edition models and had great things to say about it. I tried hers out and that was that. I loved it. She also bought the floor attachment for wood or flat surface flooring that is already included with this model. I loved that attachment when I tried hers out. It glides across the floor and sucks everything up in it’s path. The Calima had everything I wanted in one package and I really loved the cheerful yellow color. The only thing I didn't like was the price of course. However, in this case I do believe you get what you pay for. Luckily, I was able to get an Amazon Warehouse like new Calima with the floor attachment for ever so slightly more than my friend’s vac plus the extra floor attachment would've cost me. YES!!! In my 16 years married life, I have bought and used a Panasonic, a Dyson and most recently a Sears Progressive (discontinued red model). Their life span has been 4-6 years each. I vowed this time to do some research up front, so I can stop my side job of buying new vacuum cleaners. I found I loved canister vacs thanks to the Progressive, so that was my number one priority. Proven longevity was the next priority. When my vac arrived, I immeditely took it out of the box and started vacuuming away. I have family members with allergies and one with allergies and asthma. My old vacuums never did the cleaning job of this little, lightweight yellow sunshine! I enjoy vacuuming again. It is so quiet that every time I use it, my daughter comments on it. It turns on a dime and is so easy to maneuver. The cord is a perfect length and winds up in a snap. I do like the digital features (that can be touched with your toes-no need to bend down) of changing the suction power. I considered other models with the manual dial and even saw one at Bed Bath and Beyond. It wasn't difficult, but the digital is better in my opinion. Compartments open and close with such ease unlike my Progressive, which I had to wrench open every time I needed to change the bag or get an attachment out. I actually broke the clasp off that allows you to change the bag within months of first getting the Progressive. The Progressive and my other vacs for that matter, were all made of cheap plastic. The Miele surpasses all of my other vacs by leaps and bounds! This company makes great vacuums! Thank you Miele and thank you Amazon!
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Reviewed in the United States on September 25, 2016
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Verified Purchase
artgirl
Port Orchard, US
★★★★★ 5
It will change your mind about vacuuming
Configuration: Vacuum
I have Persian carpets, hardwood floors, brick, and tile and this vacuum works well on all of them. I also have short haired dogs and cats and live in the woods so there is a lot to vacuum up here. I have always had Kenmore canister vacuums that lasted forever and I wanted to get a vacuum cleaner that I wouldn't have to replace every few years so spent the extra money to hopefully get what they promise in that regard. I also spent the extra money on this C3 model because it is made in Germany. The body is heavy plastic but lightweight and has a great little rubber bumper around it so it won't mark your walls or break the plastic when you crash into something. The accessories are well made with no strange plastic seams that catch dirt. The hose and tube are made of heavy materials. I have to carry the canister up three different types of stairs including a narrow spiral staircase and it is very easy to do this. The body is slim enough so that it isn't awkward to carry up stairs while holding the hose and tube too. The machine is well designed, something I look for in everything I purchase. It is easy to change speeds, and turn on and off with your foot so you don't have to bend over everytime you want to turn it off or change the speed. The retractable cord is super nice, and something I was used to with the Kenmore. It keeps the cord safe from nicks and also makes it easier to transport and store. A couple of things I miss from my old Kenmore that I didn't get on this model was the on/off switch on the handle, the ability to go from floor to carpet with the beater brush, and 360 degree swivel hose at the attachment to the canister. This machine does come with the parquet twister attachment, which I read from many reviews was a great tool and can agree wholly that it is, and you can certainly leave it on to vacuum your carpets, but the turbo brush which comes with it too, is a much better cleaning tool for low pile rugs. So I vacuum all of my non-carpeted areas first, then switch the tool and go back and vacuum the rugs. It is a bit of a pain but not terrible. The biggest issue is that you have to carry the extra floor tool with you when you climb the stairs holding the vacuum. Again, not really terrible just a bit of a pain. I have had no issues with the turbo brush getting clogged with hair, but then I have short haired pets. I did choose to get the complete mainly because the canister holds the other attachments (crevice, upholstery, and wall brushes) inside making it easy to transport and less likely to lose the tools. The variable speed motor is soooo much quieter than any vacuum I've ever owned. My pets don't freak out when I vacuum now. The turbo tool has a switch on it which allows the suction to be reduced if you are pulling the rug off the floor. There is also a cool little metal strip down the back of the handle to discharge static electricity. You just have to keep your hand on it while you vacuum. This is a good example of thoughtful design. Because I was replacing a nearly defunct vacuum cleaner I was a vacuuming maniac for the first week I had the Miele. My children thought I had lost my mind and wondered how I could possibly be so excited about a vacuum cleaner...it was a change from my focus on other things, like riding bikes and stuff like that. But my house had become a dust bomb and after vacuuming one rug and watching the dull red change to bright red with a beautiful pattern that I guess I had gotten used to not seeing anymore...I started vacuuming everything in sight (that you could vacuum of course). Almost everything returned to its original color and I filled the vacuum cleaner bag quickly. I also love that the bag and filters keep the dust from reentering the house...so you aren't just moving it around to vacuum up again next week. And probably, most of all, even above the excellent job the machine does on removing dirt from carpets and upholstery, cleaning floors (the parquet twister is awesome for getting right up next to the baseboard at weird angles), is the yellow color. How can you not like vacuuming with a bright yellow vacuum?
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Reviewed in the United States on December 10, 2017

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