jesse - the tell tail temp on 2.0, 2.4, and 2.5l mercs is hot compared to other motors 120+ degrees. You don't want to keep your hand under it. Also it takes a long time for the engine to come up to temp . . . thermostats don't open until block temp hits 143 degrees. you'll get a weak pee stream until the engine heats up. If you live up in New England . . . this time of year it seems to take forever.
If the engine is new to you. do the poppet, tstats, plugs, gear oil, and water pump?
p.s. - if you only found 4 . . . and you got the front, sides, and the one under the zinc . . . you are missing the 2 under cavitation plate.
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