Why do the old mercury v6 has green paint on the top of the block

**killerpirate** · 12-03-2020, 04:27 PM

Hello.
I noticed that the older mercury racing outboards have a green or blue paint on the top of the block. Why is this?
I saw multiple engines with this paint

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Oh and also why is there a bolt on top between the cylinderbanks on the second image? Is this a place for some kind of pressure sensor?

**mach351** · 12-03-2020, 04:44 PM

Green paint means 225 promax....might have been how they kept them straight on the assembly line. The “bolt” in that pic is a plug. Sometimes that plug has a bolt in it for the top pin to keep the cowling from shaking to death

**killerpirate** · 12-03-2020, 05:14 PM

Originally Posted by mach351

Green paint means 225 promax....might have been how they kept them straight on the assembly line. The “bolt” in that pic is a plug. Sometimes that plug has a bolt in it for the top pin to keep the cowling from shaking to death

Really? So the top motor is a 225 hp engine? It is an xr2, i thought xr2 were 150 hp. So the paint is from factory?
Thnks for the bolt answer

**Capt.Insane-o** · 12-03-2020, 05:29 PM

green..pink..blue...yellow..

**mach351** · 12-03-2020, 06:29 PM

Originally Posted by killerpirate

Really? So the top motor is a 225 hp engine? It is an xr2, i thought xr2 were 150 hp. So the paint is from factory?
Thnks for the bolt answer

Your XR2 is different than our XR2 so idk about paint color. Your XR2 I thought was rated at 200hp....ours is a 150 and nowhere near as cool

**tlwjkw** · 12-04-2020, 05:23 AM

Originally Posted by mach351

Green paint means 225 promax....might have been how they kept them straight on the assembly line. The “bolt” in that pic is a plug. Sometimes that plug has a bolt in it for the top pin to keep the cowling from shaking to death

take a closer look.. top picture not a 225 block... its his XR2... have never heard "exactly" what tha paint means but i don't think designates a particular motor... jmo.

bet FUJIMO can tell us or find out.

**Merc 2.5** · 12-04-2020, 06:04 AM

The 2nd pic of the bolt , being a promax ,it should have a fitting with hose goin to poppet , unless someone did away with it for single adapter

**tlwjkw** · 12-04-2020, 06:16 AM

Originally Posted by Merc 2.5

The 2nd pic of the bolt , being a promax ,it should have a fitting with hose goin to poppet , unless someone did away with it for single adapter

agree.. don't remember ANY promax having that bracket set up.. jus tha hi perf. on a one piece adapter..... jmo.

**TEXAS20225** · 12-04-2020, 03:59 PM

right on TDub hose bibs mean 200

**25two.stroke** · 12-04-2020, 07:34 PM

One of my 2.4s has purple paint spot on it...I wanna know what that was...and the block has no serial number that I can find.

And yeah, there were different xr2s. The black max XR2 (150) is not the same as the racing XR2 (2.0 choked down 2.5 block I think).... but that is not the point of this thread.

**Markus** · 12-07-2020, 09:32 AM

Originally Posted by killerpirate

Really? So the top motor is a 225 hp engine? It is an xr2, i thought xr2 were 150 hp. So the paint is from factory?
Thnks for the bolt answer

The European race XR2 (which you showed in the gear case thread) is a different engine from the American XR2, which was a bass fishing engine.

Both were based on the 2 liter block, but the race XR2 made just below 200 hp in stock form, while the bass XR2 made roughly as much power as a 150hp engine was allowed to make, i.e. 165 hp in the center of the recommended WOT rpm range, and probably a bit more at the the top of the range.__PRESENT

**WaterZebra** · 12-07-2020, 10:20 AM

Originally Posted by killerpirate

Hello.
I noticed that the older mercury racing outboards have a green or blue paint on the top of the block. Why is this?
I saw multiple engines with this paint

Oh and also why is there a bolt on top between the cylinderbanks on the second image? Is this a place for some kind of pressure sensor?

Merc also used little animal icons on their engines like elephants and mice...........

**roadkill636** · 12-07-2020, 11:15 AM

Originally Posted by WaterZebra

Merc also used little animal icons on their engines like elephants and mice...........

Yep. My Promax has a bunny on it

**Dave S** · 12-08-2020, 09:49 AM

Merc put leaky paint cans on setting power heads I was there..... really......from the paint shop thu the door........REALLY........It was just a Glitch.......1987........I was just looking at the prices of 2.4 race power heads....$7635.......no dealer mark up disscount.......#6 /4 cases..... in the range $7500 stock 3.4 cases 5000......1962 sporty.....$162......Things were cheeper back then.