Help: Identify this mariner - no serial number

[Amott1989]

I have attached pictures my guess from doing research online is it's a 1988 or 87 2.4 l Mariner Magnum EFI 220 horsepower. This came on a big 26-ft Bayliner deck boat that I recently purchased there doesn't seem to be too many of these still left out there that people are posting about or working on.

[mach351]

That’s your date code behind the timing arm....December of 90, so it’s a 91 model year block at least. Probably just a hodgepodge 2.4 - nothing wrong with that.

[TEXAS20225]

cowl is laser 220 stuff ecu is off of a late model 2.5 200 efi its A30 according to sticker

[Amott1989]

cowl is laser 220 stuff ecu is off of a late model 2.5 200 efi its A30 according to sticker

Sorry to ask this but could you elaborate .. ecu? What do you mean by A30?.

[roadkill636]

You also have a 5" extension on your mid section.

Ecu electronic control unit. Is the computer that fires the injectors.
A30 is the exact programming of the ecu.

[Amott1989]

Yeah I know about the 5-in extension it's too long for my boat so I have to install jack plates on it to lift it up. And thank you for clarification on the others

[Aaronhl]

Near that timing arm what letters do you see cast into the bock where the top meets the bottom?

[Amott1989]

Near that timing arm what letters do you see cast into the bock where the top meets the bottom?

Where about is that timing arm you're talking about?

[Amott1989]

Where about is that timing arm you're talking about?

On the same side as the shift cable and throttle?

[Amott1989]

On the same side as the shift cable and throttle?

Look at the newest pic

[Amott1989]

This one

[Aaronhl]

Here is an example of where to look for the two letters
UPLOADING PIC NOW

[Aaronhl]

[Amott1989]

Can you get that picture zoomed out a little bit?

[tlwjkw]

here is your own pic.. stamped 12 20 90.