1987 mercury 75

[redneck joe]

ok serial number is confirmed as a B. Found on another forum that they stamp the freeze plug.

B218795

 

[redneck joe]

also that the flywheel cover is three, not four wingnuts putting it to an 87.

 

[redneck joe]

and finally, verified here.

Mariner Outboard Serial Range 75 (3 CYL.) 0A996142 THRU 0B240450 [USA] [0A996142 THRU 0B240450 [USA]] - Parts Lookup | Crowley Marine

View parts diagrams and shop online for 0A996142 THRU 0B240450 [USA] : Mariner Outboard Serial Range 75 (3 CYL.) 0A996142 THRU 0B240450 [USA]. Offering discount prices on OEM parts for over 50 years. FAST $4.95 shipping available.

www.crowleymarine.com

Now, just noticed clicking when spinning in neutral so going to disconnect the shift cables and see if that fixes it.

 

[redneck joe]

OK disconnected shift cables and manually shift under the hood and acts just like my running 50 so I think I'm good there?

Side note, the thingies z(little log looking things) that clamps into the trunion (think I got that right) were zip tied into place....

 

[redneck joe]

I know lots of posts, just documenting and asking questions.

We've been turning over the motor with a jump box, no batteries in the boat. I hooked up my batteries and instantly wires got hot. Disconnected the battery and other than a bit of smoke all good.

The solenoid appeard to gave been recently replaced (all shiny and clean).

Thoughts?

 

[redneck joe]

Looks like the solenoid was replaced with one for a trim system. Correct one be here tomorrow.

Speaking of trim... during researching all this I think I can say this motor never had tilt and trim on it. No solenoids for that under the hood and e tra wires on the harness. That actuator add on was just that, an add on.

 

[Mc Tool]

Not sure what you mean?

They are a map of the port windows as they are located in the cylinder wall.

 

[redneck joe]

OK I took a class in high school circa 1080 so I think I know what all this is. Was it to determine what block it was?

 

[Mc Tool]

OK I took a class in high school circa 1080 so I think I know what all this is. Was it to determine what block it was?

Nah more as a recipe for modification or determining if porting has been modified ,which could be a deal breaker if your trying to resto a classic .
Some tuners publish their port maps so others can copy their results , you can now get silicone castings of the actual port runners , both 2 and 4 stroke so you can emulate them as well .