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Author Topic:   Old Mercury What year? S/N?
bang4dabuck posted 05-14-2003 12:28 AM ET (US)   Profile for bang4dabuck   Send Email to bang4dabuck  
Would like to know what year and find the serial number before I turn it over to a pro to work on. 70HP with blue lettering. i think late 70's to early 80's ...just a guess. Anybody know where the vital markings are on this motor ? Any help appreciated.


jimh posted 05-14-2003 09:28 AM ET (US)     Profile for jimh  Send Email to jimh     
Not an expert opinion, but my 1976 Mercury has blue trim and lettering.
NWflyfisher posted 05-14-2003 11:47 PM ET (US)     Profile for NWflyfisher    

I've got a '78 Mercury 700...70hp measured at the powerhead back then. I'm certainly no authority on any of this, but maybe something I offer will help you.

1. In my owners manual, it states "Serial Number: The serial number is stamped into the serial number plate on swivel bracket..." The swivel bracket is located just above the Tilt Tube. So, if you stand in the stern of your boat and look where the engine clamps onto the transom, you'll see the swivel tube that allows the engine to "tilt." Just above that should be the serial number plate.

2. Once you have the serial number, you can go to to cross reference the serial number to the year of your engine.

1. Contact Mercury with your serial number and they'll be happy to send you a copy of the owner's manual for $15.00 (or at least that's what it cost 3 years ago when I bought mine.)

2. Go to the Reference section of your local library once you determine the engine's year and you should find outboard maintenance and repair manuals (Clymer??)that cover it; mine did and I live in a small town of about 6,000 albeit known as a "fishing villiage" on Puget Sound.

ALSO: I'll be happy to scan whatever materials I have on hand regarding my engine and email them to you if you determine your engine is a 3 Cyl 1978 Mercury 700.

BY THE WAY: My marine mechanic tells me this 25 year old engine "runs like a clock" and " well as anything new." I thank the previous owners for the preventive maintenance they gave her.


bang4dabuck posted 05-16-2003 02:38 AM ET (US)     Profile for bang4dabuck  Send Email to bang4dabuck     
Thanks. I'll try looking again. Whalertown told me it was back somewhere near the mounting plate. Didn't see it. Maybe this time. i saw a 50Hp that looked like it on one of those video shows (about pets turning on humans) and it looked just like mine not an old clip either.
Dick posted 05-16-2003 09:33 AM ET (US)     Profile for Dick  Send Email to Dick     

Welcome back.


Bigshot posted 05-16-2003 12:41 PM ET (US)     Profile for Bigshot  Send Email to Bigshot     
if it does not say 700 then it is a 79-83 with blue decals.....assuming it is a 3 cyl.
bang4dabuck posted 05-17-2003 03:06 PM ET (US)     Profile for bang4dabuck  Send Email to bang4dabuck     
I don't think it is a 700 because I don't see it anywhere. Where would that be marked ?


NWflyfisher posted 05-17-2003 07:09 PM ET (US)     Profile for NWflyfisher    

Never left...check in about once a week or so. Just don't usually have anything intelligent or useful to add to the dialogue.

Hope all is well with you.


NWflyfisher posted 05-17-2003 07:16 PM ET (US)     Profile for NWflyfisher    
Stand 5 feet behind your boat. Look at the engine cowlingeng. You would see
running down the center of the cowling.


NWflyfisher posted 05-17-2003 07:18 PM ET (US)     Profile for NWflyfisher    
Uhhh, "cowlingeng" would be a variation of the word least according to my nimble fingers.


murph1 posted 03-19-2006 07:54 PM ET (US)     Profile for murph1  Send Email to murph1     
Hi, I know this is an old post, but I was going through the same thing as the original poster. Using everyones advice I determined my boat's engine to be a Merc 700 1978. This is my first boat and it was the best i could afford for the time being. The engine however is in need of some work.

I noticed NWflyfisher, that you have the same motor! I was wondering if your offer to scan the information you have on the motor is still on the table? Again, i know this is an old post, but I figured i'd atleast try....


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