Mercury Mod VP Bridgeport overheating and possibly fake???

**tlwjkw** · 07-21-2019, 05:55 PM

test tha over heat sensor ta see if tha buzzer still works.. should alarm if temps are as high as you think they are...

**mach351** · 07-21-2019, 06:00 PM

Could very well be a modVP. No Oiler and no pulse pump. Nice find.

Those decals aren’t original. Modvp’s with that cowl had the same “mercury” as the Bridgeport’s. Easy to source correct decals on eBay. Or you can keep the blue to match the boat. Just a matter of personal preference

**BUZZIN' DOZEN** · 07-21-2019, 06:29 PM

Before we start high fiving, there's still a heat problem and I notice there's no dump from the poppet?

**ShadowBassBoat** · 07-21-2019, 07:17 PM

Originally Posted by BUZZIN' DOZEN

Before we start high fiving, there's still a heat problem and I notice there's no dump from the poppet?

No dump from the what? Sorry I’m new to outboards. Well. Boats in general.

**tlwjkw** · 07-21-2019, 07:51 PM

0A953136.. should be a build date stamped close to that number on tha block half.. maybe behind tha bend in tha timin' arm..

"Service Literature for MERCURY 2.4L MODVP ELPT"....

from mercury marine site....

site below will give ya some help identifying parts.. only difference is its for a coupla years later than yours.. basically only difference will be tha "two piece heads"..

http://www.marineengine.com/parts/me...rcmar-24l-carb

**pbxcomm** · 07-21-2019, 08:00 PM

My experience with the MODVP's:
Out of the factory they are setup to idle very little to wide open Throttle, no long term mid throttle or mid range. The cooling system is setup for this as is the timing.
You will need to check the heads for thermostats (most likley there are none). if there are none you will been to install a restricter washer where the thermostat would normally be. I think a 3/8' washer fits.
Also you should back the MAX timing off of 25 degrees to around 22.

I went with one peice heads (lower compression) otherwise the two peice heads require 100+ octane. Bring the compression down to no more than 140LBS.

As fas as jetting, I ran .062 high speed with the exception of #4 CYL whoch was .064. The number 4 CYL seems to be historically hotter due to timing.

**pbxcomm** · 07-21-2019, 08:06 PM

The bridges (across the ports) had tendencies to crack, cave in and grab a ring or two. Run it rich, I always ran 1 1/2 oil pints to 6 gallons. This will help keep those bridges cool.
Again, with the heads you have, you will need to run 100+ octane minimum, anything under you will bring that gem of a powerhead home in a bucket.

**ShadowBassBoat** · 07-21-2019, 08:38 PM

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Originally Posted by tlwjkw

0A953136.. should be a build date stamped close to that number on tha block half.. maybe behind tha bend in tha timin' arm..

"Service Literature for MERCURY 2.4L MODVP ELPT"....

from mercury marine site....

site below will give ya some help identifying parts.. only difference is its for a coupla years later than yours.. basically only difference will be tha "two piece heads"..

http://www.marineengine.com/parts/me...rcmar-24l-carb

is that the number im looking for? other than that i didnt see another number. although it got dark on me

**tlwjkw** · 07-21-2019, 08:45 PM

no, its hand stamped 1/8" numbers.. will be m/d/yr.. it will be to tha right of tha serial number on tha block, behind tha advance timing arm..

**ShadowBassBoat** · 07-21-2019, 08:48 PM

Originally Posted by pbxcomm

The bridges (across the ports) had tendencies to crack, cave in and grab a ring or two. Run it rich, I always ran 1 1/2 oil pints to 6 gallons. This will help keep those bridges cool.
Again, with the heads you have, you will need to run 100+ octane minimum, anything under you will bring that gem of a powerhead home in a bucket.

the guy we got it from said to run 87 in it so thats what we did. we've only ran it probably 25 minutes if that. the best we can get is 93, so what do i do?

**ShadowBassBoat** · 07-21-2019, 08:50 PM

dang it. ill have to check again tomorrow. the boat is at my grandmas farm and im already home. ill get back to ya on it tomorrow

**tlwjkw** · 07-21-2019, 08:53 PM

might be hard ta see it.. sometimes they must be a little weak with tha hammer but its there in that general area...

last two numbers may be 84, 85,or 86 (year)

0A is early second gen. block number but tha two piece heads went away in '87 best I remember..

**ShadowBassBoat** · 07-23-2019, 02:57 AM

So if I’m supposed to use 100 octane would using 87 cause it to overheat?

**tlwjkw** · 07-23-2019, 04:15 AM

do a compression check on it.. its not brand new straight outta tha box.. no mater what it looks like or what its "supposed ta be", its an old motor... you have no idea what heads or on it... stop with all tha guessin'..