New to mercs - what exactly do I have here?

**JoshKeller** · 10-20-2019, 11:49 AM

Hey guys, took a boat on a trade and it has a merc/mariner motor on it. Serial number for transom bracket is 6637220 - 150 hp.

The intake manifold has the number 969-9078-c1. The heads are 18787-c2 for both. Carburetors are wh-39-1,2,3 with the top and bottom being 1626 and the middle 1346.

What exactly do I have here? Is it a 2.0, 2.4, 2.5 block? Is this thing safe to run with the jumble assortment of parts? Approx year and true horsepower? Thanks so much!

**gotboostedvr6** · 10-20-2019, 12:06 PM

Old 2.0

They are good motors.

**JoshKeller** · 10-20-2019, 12:11 PM

If it has been bored over before, will the pistons be stamped with the oversize amount?

**JoshKeller** · 10-20-2019, 12:42 PM

To add - not sure if its pertinent info, but the bore on all 6 is 3.375" +/- .001 according to my digital caliper

**gotboostedvr6** · 10-20-2019, 12:43 PM

Mercury Piston Standard 2.0L Bore Size is 3.125

**gotboostedvr6** · 10-20-2019, 12:45 PM

Mercury Piston Standard 2.5L Bore Size is 3.5"

**gotboostedvr6** · 10-20-2019, 12:46 PM

Mercury Piston Standard 2.4L Bore Size is 3.377

**gotboostedvr6** · 10-20-2019, 12:47 PM

Take several pictures of the intake manifold behind the carbs.

Also put a magnet on the cylinder and see if it sticks.

**JoshKeller** · 10-20-2019, 12:58 PM

All 6 are 3.375" and a magnet does not stick.

**JoshKeller** · 10-20-2019, 12:59 PM

**gotboostedvr6** · 10-20-2019, 01:04 PM

It's a 2.4 liter 175 or 200hp with late model one peice heads.

**vnemous** · 10-20-2019, 01:35 PM

1985 2.0 150 ELPTO sold in 1987 per serial number given

**JoshKeller** · 10-20-2019, 02:12 PM

Originally Posted by vnemous

1985 2.0 150 ELPTO sold in 1987 per serial number given

Is that off the motor bracket serial or off the powerhead?

**vnemous** · 10-20-2019, 02:46 PM

6637220 Even starter has manufacture date on 1985

**Merc 2.5** · 10-20-2019, 03:10 PM

Originally Posted by JoshKeller

All 6 are 3.375" and a magnet does not stick.

I'd say chrome bore 200. It has 200 on welch plug. I had 2 ,2.4 200 with that 200 on plug,, also the air box is fir 200 also , the 150 had diff air box
But then again a vertical 150 clam shell wont fit horiz 200 without mods. Does it have turnbuckle latches? Or 1 big one in front?