What year model is my Mercury 6hp. Serial number is OD016308

Product Line Year H.P. Model Number Model Description MERCURY 1978 115 1115628 MERC 115

Only things I could find ...

1. S/N beginning with 8075603 , 2.2 Hp was 1984
2. There was a different reference that different countries could have different serial number series which complicates matters.
3. But there was also a reference indicating for outboard motors ... that the nameplate which has the model and serial number ALSO had the year written down ... the last 2 digits of the year in a box in the lower right hand corner

go google and type in--- mercury outboard serial numbers -- there are sites that listhp against serial numbers against year of manufacture
while you serial number may not be listed they state that the beginning of the number to the next changing number is the year of make
for example ---4261012 to 4302999 ( next number 48103665,year 2002) may be year 1999 so your number would be a 1999 model
The information provided will take a bit of understanding as it appears that the manufacturer changed the method a number of times
talk with a mercury / mariner service shop as they will have the information on hand

Hello,

Mariner 4hp are identical to Yamaha engines.
You should find a sticker on the port bracket with serial and model number.
If that sticker has disappeard, an aluminum piece is stamped in the side of the cilinder. The numbervstamped in that round pieceis the serial number. I can convert that serial number in a year/model number...

According to i-Boats, "Nothing in the Mercury Mariner Outboard engine model numbers or serial numbers provides year information directly.
The first serial number sold in a year becomes the beginning serial number. Serial numbers between that year's beginning serial number and the next fall into the same year. Search for your engine horsepower on the Mercury Mariner serial number year chart located here to find the beginning serial number for the range that includes your engine." Your other option is to take the serial number to an authorized Merc marine eager and they can look it up for you.

call mercury outboard they can tell you the answer to your question

I was able to find the following information regarding 6 HP manufactured by Mercury. You can find more information on the boating forums.

http://forums.iboats.com/mercury-mariner-outboards-25/

HP

Cyl.

Beginning Serial #

Year

6214086111961621485612196262155144319636216075131964621745521196562195827819666220961711967622284857196862A910596198662B114231198762B233200198862B3855001989

According to marineengine.com, it looks like it could be in the 1983 sequence of serial numbers.
http://www.marineengine.com/mfr/mercury_models.html