how to tell a merc 2.0, 2.4, 2.5 apart visually ...

bsteckel · #1 07-14-2008, 01:34 PM

going to look at another motor on the way home today. how can i tell visually if it is a 2.0 or 2.5 motor?

is there anything i can look for so i am sure what motor it is?

thanks

bsteckel · #2 07-22-2008, 11:34 AM

Shrimpin ..... any way to tell them apart?

thanks

bigshrimpin · #3 07-22-2008, 06:56 PM

yeah . . . I could write a book here. What years are you talking about? It should be pretty obvious.

Heads, carbs, intake, serial number, decals, block difference 2.0L vs. 2.5L (buldge . . . 92 and later).
Search screamandfly.com or get a factory manual. Can't the owner tell you what he's selling???

bsteckel · #4 07-22-2008, 08:13 PM

no .. all owner knows is that it is an 89 mariner 150 25"

it seems that most people out there do not know what they are selling. i am finding it very common. i have had people give me the wrong year ... some off by as much as 10 years .. maybe that was on purpose

the only number i can find on the motor is very hard to read .. i think it reads 06139606

these numbers were on a tag that is sort of worn off.

bigshrimpin · #5 07-22-2008, 09:10 PM

serial number is also on a freeze plug on the powerhead . . . also check the date on the starter (keep in mind some starters have been replaced). 92 (serial begins with "0D") was the first year of the 2.5L and 91 was the last of the 2.4L. 1988 and later 2.4L should have 1pc heads. Generally speaking the 150's were 2.0L except xr4, xr6, Mariner Magnum II/ III. 2pc top hat style heads (1983 - 1988) 135/150's will have a stamp 3 1/8 and 2.4L will have 3 3/8.

bigshrimpin · #6 07-22-2008, 09:16 PM

OC would be around 89 or 90.

bigshrimpin · #7 07-22-2008, 09:22 PM

92 and newer carbs will have a stamp on the side WMH carbs.

16's are 200hp carbs :)

wmh - 12 and 13 are 2.0L motors

wmh - 14, 15, 16's are 2.5L motors

Old style wh- carbs . . . the stamp is on the top . . . 1990 and earlier.

wh-20 were the fastest . . . I have 2 sets off 2.4L v225's ;)
wh-22's are the second best 200hp carbs.

Diamond shaped heads are pre-83 motors . . . head bolts on the cylinder walls . . . no oil injection.

bigshrimpin · #8 07-22-2008, 10:05 PM

Quote:

Originally Posted by bsteckel

no .. all owner knows is that it is an 89 mariner 150 25"

it seems that most people out there do not know what they are selling. i am finding it very common. i have had people give me the wrong year ... some off by as much as 10 years ..

That's right on par for the course . . . Welcome to my world. You'll learn to ask the right questions and save yourself the gas money and time.

bsteckel · #9 07-23-2008, 06:40 PM

ok .. here are some numbers ..

one the top freeze plug C139606

on the carburetor 1374-5427-0 or C then WH these numbers are on the top of the carbs

bigshrimpin · #10 07-24-2008, 07:04 PM

There are more numbers on the carbs . . . the carbs on C's are funny. The numbers aren't next to the "wh-". I'm almost 100% sure it's a 2.0L . . . I don't think merc made a 2.4L 150 in 89 except for the XR4 which I think was only 88. I don't have my book here, but I'd bet you it's a 2.0L. Did you buy it?