Topic: 195? Mercury Mark 5 questions – Antique Outboard Motor Club,Inc

This topic has 10 replies, 6 voices, and was last updated 1 month ago by dave-bernard.

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May 9, 2025 at 6:15 am #296282
MHarrington
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Hello everyone,

I am working on a 195? mercury mark 5 for a family member that hasn’t ran in a while. I don’t really know anything about mercury outboards, never worked on one till now. So far, I have got the engine free, worked on the rewind starter some, got spark, and got it to pop out the water. I am working on the carb right now. But I removed the propeller because I believe the neutral needs adjusted because it doesn’t go into neutral. Does anyone have any advice on how to do that (I can see someone tried and failed)? Also is the hub of the prop supposed to come out with these little gears not inside of the prop (see pic)? One last question for now, I believe the ID tag is supposed to be between the 2 transom clamps. If this is true, I don’t have an ID tag. Is there an alternative spot to find the model number and serial number? I don’t see a welch plug like OMC or anything that is too obvious to me at least.
May 9, 2025 at 6:25 am #296283
MHarrington
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I think I got the picture of the prop this time.
May 9, 2025 at 7:43 am #296285
seakaye12
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On those engines…..I don’t think neutral will work unless the engine is running. Others can correct me if I am wrong.

That is the friction clutch mechanism in the prop hub. Mercury was trying to eliminate the need for a shear pin.
May 9, 2025 at 9:17 am #296287
Buccaneer
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1955-59-Mark-5-6-6a

Prepare to be boarded!

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MHarrington
May 9, 2025 at 9:21 am #296289
green-thumbs
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If you can access the 1965 and priot Mercury Models Service Manual and the Parts Manual specific to your model and serial
number life will be easier. Keep
women and children out of earl shot when working on this series,
Best i can say agout them is they
are Green and Dull Aluminum,
Louis
The powerhead seems to be OK, but lower end was something Mercury
was not happy with.They changed
design several timnes,
Good Luck
May 9, 2025 at 9:22 am #296290
Buccaneer
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Prepare to be boarded!

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MHarrington
May 9, 2025 at 10:30 am #296296
dave-bernard
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serial # is on the front plate on the tank. Yes the motor must be running toget neutral. without running just put in neutral ant pull the starter a few tines and the prop will stop spinning.

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MHarrington
May 9, 2025 at 2:43 pm #296298
MHarrington
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I don’t see anything on the gas tank it self except the remanence of a old decal. But on the bracket it mounts to I see Pat. Off. 766012. Is that the serial#?
May 9, 2025 at 3:36 pm #296299
dave-bernard
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It is on the front of the gas tank band ( start stop directions) held on by 4 pins. Sorry.

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MHarrington
June 3, 2025 at 3:33 pm #297006
Eric McNett
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MHarrington wrote:

I don’t see anything on the gas tank it self except the remanence of a old decal. But on the bracket it mounts to I see Pat. Off. 766012. Is that the serial#?

Do you have a photo of the engine in question? Mk5s didnt have a decal on the tank, they had a metal lower wrap cowl, chrome trim/tank ring with MERCURY molded into it and the model,hp and lubrication instructions on a large metal tag riveted to the front of it.

Eric McNett
"I love a challenge!"
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