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1985 Mariner / Yamaha 8 hp parts compatability

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prairiebuilder

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I have a Mariner/Yamaha which I believe is an 1985 based on the tag which reads 8M 6G1 S 016440. From information I've looked up here and elsewhere, the Yamaha equivalent is likely an 1986-88 8SJ. My outboard came to me with both bolt tabs broken off the lower casing cap (aka bearing carrier) which keeps me from rebuilding it, so I need a new one. I am hoping someone here will know if a Yamaha lower casing cap will fit my Yamariner lower. Yamaha parts are easier to locate and they even offer an assembly with pre-installed bearing and shaft seals. The parts diagrams online for Mariner and Yamaha are nearly identical (except for part numbers). Through my research I have compiled the following information.

The Mariner part number is 11648M which is just the casing cap

The equivalent Yamaha casing cap part numbers are:
6N0-G5361-00-00 (earliest I could find)
60R-G5361-00-4D (this could be a misprint)
6N0-G5361-00-4D
6G1-45361-01-EK
6G1-45361-01-4D
6G1-45361-01-8D (listed as current).

I have seen the Yamaha assembly listed as 6N0-45361-00 .

There is so much misinformation out there, that I figured I'd try and ask someone else who has worked on one of these outboards. Any help would be greatly appreciated.
 
8M 6G1 S 016440
20260416_185740.jpg
 
Yep, that's what I came up with also Bosco.

My question was if anyone had successfully used the Yamaha part instead of the Mercury/Mariner part. Is there even a difference?

Thanks
 
Plenty of folks have successfully used a Yamaha part numbered part in their Mariner. Particularly when Mariner branded parts are no longer available. In some cases, easy to do. In other cases not so easy.

Given that a new Mariner branded part is available for much less than a Yamaha branded part, why would you want to use the Yamaha part?
 
I can get an entire Yamaha assembly which includes the carrier, a bearing, o-rings, and seals for the same cost as the stripped Mariner carrier. In this economy, I'm looking for ways to save money. If you think the Yamaha carrier will fit, I'll give it a shot. I will try to remember to report back with my findings. Thanks again.
 
The Yamaha assembly for the complete lower unit (short shaft) is 6G1-45300-03-Ek. It should plug and play with your motor.

 
As promised, here is the moment some of you (well, maybe only me) were waiting for... The Yamaha numbered part fit my Yamariner lower unit casing perfectly! The assembly I ordered from AliExpress came with the lower casing cap (bearing carrier), the main bearing, the bushing (pre-installed), one thick and one thinner o-ring, and the two shaft seals for $8.40 plus $10 shipping. The shaft seals and bearing were easy to install. The bearing had the same markings as the original Mariner branded part and the seals were, well, like other shaft seals I've installed. One thing of note was that the new carrier has a second groove on the prop end which holds the second skinnier o-ring. I'm guessing it was an improved design to keep the carrier from corroding to the gear housing. Everything matched up and fit perfectly into place with zero binding and normal (expected) seating force. I'd mark this down as a win for us do-it-yourselfers on a budget! Thanks to everyone who provided input on this adventure. Now, on to the next one. James







 
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