Re: I KNOW, I KNOW, there's a Bible about serial numbers but I'm cunfused.
There are 3 different serial numbers associated with a Mercruiser stern drive power package. One for the engine, one for the drive, and one for the bit in between the engine and the drive, the transom housing...
One of the numbers you have there (A609197) is the engine number for a 1986, 140hp, 3.0 litre (181 cubic inch)....
Three serial number stickers are supplied with each assembly. Part of the installation process is to apply one of the serial number stickers for the transom housing and the drive to the engine cover. This is to make it easier for subsequent techs to find the numbers should they become difficult to read on the drive or transom assembly. The last of each of the stickers should be put in the owners handbook. I am yet to see the correct procedure carried out on any boat! Bloody slack I call it...
Chris......