Mariner 1977 - 80cc help :D

adam92

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Joined
Jun 23, 2022
Messages
5
Hey there, all of a sudden i decided to finalize the renovation of this outboard engine which i did pull apart two summers ago and of course it ended up 90% finished, i documented some of the disassembly (i never took apart any engine before)

I took it apart because of the lower bearing by the power output had completely fallen apart as seen in picture 3

I did order ALL new gaskets for every surface as well as a new timing coil(?) as the old one was difficult to mend

I was very thorough except i neglected to do anything to the cylinder walls or the cylinders, it seemed too scary to deal with but they had some scoring,(stupidly i didnt photograph it, i included a picture in which a part of a cylinder and ring is visible i you reckon i should de-assemble and hone the bores/change the consumables before finalizing the assembly?

There is compression, i am able to spin the flywheel by hand and there is some resistance but as i said, i dont know what im doing really, i dont have any special tools, shoot me some tips
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adam92

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Joined
Jun 23, 2022
Messages
5
The engine will be mounted to this 4,7meter glassfiber boat from which i have removed all the foam between the keels and done lots of epoxy fixes to the bottom hull
20220623_174809.jpg
 

jimmbo

Supreme Mariner
Joined
May 24, 2004
Messages
13,463
Welcome to iboats

Your engine is either of the 1968 thru 1972 vintage, or 1978 thru 1983 vintage. The Grooves/Knurls on the Piston Skirt, are post 72, so I suspect your engine to be in the Latter

If the Cylinders are scored, you should address that, as it will just get worse.
Looking at the pic taken from the Exhaust ports shows on Piston Skirt looking good but minor scuffing near the rings. Of course that is not showing all the Skirts, Rings.
Lower Bearing Failures aren't all that common, as that bearing is usually very well lubricated
 

adam92

Recruit
Joined
Jun 23, 2022
Messages
5
Thanks yea i suppose it'd be foolish not to adress the pistons when doing a full renovation, perhaps ill wire the thing up first and check how it runs/what kind of compression i can get out of it

Do i need to re-time the coil thingy after this job i've done?

Also, should i be worried about the reduced rigididy of the hull/deck on the boat as i've removed all the foam?
 
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jimmbo

Supreme Mariner
Joined
May 24, 2004
Messages
13,463
If the Foam was waterlogged, the odds are that the Stringers between the Hull and the Floor are rotted as well
 
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