Jacobsen Serial numbers can be confusing and sometimes
may be incomplete. Each Jacobsen serial number consists of two parts, a
"prefix" and an "item number". The prefix can consist of any number of letters,
spaces, or dashes. The item number will be only a number, and should consist of
only numerical digits. The H & M Models Jacobsen serial number system will
help you determine what part of the serial number is the prefix, and what part
is the item number.
To look up a serial number you first need to select
your product in the large product list box on the left side of the application
below. Once you select a product, the page will reload and you will see your
product listed right above the product picture. Below the product picture you
will see another list box that holds the prefixes for your product. You should
be able to find one of the prefixes listed on your Jacobsen serial number tag.
If you can't find an exact match, pick the one that is closest, as sometimes
Jacobsen did not put the entire prefix on the serial number tag. If there is
only one prefix shown it will be autoselected and that will be the only prefix
for your product. Now if there was more then one prefix select the one that
matchs your tag, and the page will reload again, and under the "Serial Number
item number" input box it will indicate how long the item number will be. To
find your item number look to the right of the prefix on your serial number
tag. You should see a pure numeric value without any letters in it that matches
the length of indicated under the item number input box. Remove any dashes or
spaces from this number, and enter it into the serial number input box. Then
click the "retrieve product" button, and the year that your Jacobsen product
will appear below.
If it did not work check to make sure that you have the
correct prefix number and the correct number of digits in your item number. If
you cannot figure out what your prefix number is, click the reset button and
just enter in what you think your item number will be. If you have a correct
item number the system will display the matching prefixes below.
To make the entire Jacobsen serial number lookup finder
viewable at once, try pressing the "F11" key.
If you unable to figure out your engines year using the tool below, you can try
sending a the serial number and a good quality picture of the engine to
. Be aware that if you do send us a picture of your
engine, we reserve the right to display the image on this site as an example of
that model engine.