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That makes sense. I'll start with these easily accessible ones, and then do a vacuum and pressure test.

I've seen several posts that this motor has issues with overheating. I was just asking if there was a "fix" to prevent that.

Yes, mine had a gasket also. Using a couple flat head screwdrivers with more force got it. Thanks! . I'm leaning towards just doing all the seals, o-rings, and gaskets for the lower unit now. I'm in this far; might as well...

Okay, I started with a couple flat head screwdrivers, when it resisted, I figured I had better ask here.

1978 Mercury 70hp - Serial # 4979486 I'm trying to figure out how to remove the water pump base so I can replace the seal around the shaft.

It's tough because less and less know what they are talking about. And oddly, unlike you and others here, many talk in absolutes - spouting like they know what they are talking about. I can't figure why moderated forums are losing popularity and Facebook Iz Da Place.

I read somewhere that this 700 only used poppet valves, but I've gotten much more conflicting information on this motor doing research than any of the other motors I've had. I've only owned a 84 Mercury 7.5, a 2010 Yamaha 9.9, a 1984 Suzuki dt75, and the recent 1994 Johnson 90hp.

Is there a fix for the possible overheat issue? . I'm thinking for the undersized lower unit to just not oversize the prop and to not floor it - just let it get up to speed gradually. This will just be a casual fishing boat and motor.

I'm thinking the Stator and Trigger were original. The wires just crumbled away as I removed them. I didn't want to risk it. I bought a new Sierra Stator and Trigger. They should be here Saturday. I'm building a new Wiring Harness. I stripped the motor down then degreased cleaned the motor. I'm...

I'm reading that finding a balanced fixed setting is good enough. This will be a fishing boat. No water sports.

I've been digging into this and cleaning things up. As mentioned earlier, it has good compression - 130+/- at each cylinder. Mechanically it's looking good, and cosmetically it is nice also. Sometimes you have to determine at what point is the teeter point between it's too old to be worth it and...

Okay, so Ai is an idiot! Are there later models that I can harvest power trim tilt?

Ha! "Artificially" Intelligent.

Google Ai tells me the 1978 Mercury 70hp didn't have a Power Trim option. But I'm reading that it came on later models. . Does anyone know if there are newer models that have Power Tilt Trim that can be modified to work with a 1978? I know I can buy a CMC, but I was wondering if there are power...

Okay, yep, the boat has a speedometer. Thanks

The line going to it appears to be a small hose line.

I put one of the bolts back in hand tight so when I hit, it didn't go flying. Does things look good?

1978 Mercury 70hp I've been pulling on it, hitting it with a rubber mallet, and it's stuck good. I sprayed some PB Blaster around the outside to see if that might loosen it. . Any Tips for getting it off without breaking it?

My shopping for a new one I'm noticing they all have BLK/YEL where mine has ORN for Orange. . Mine might likely be a pretty old one. . Mercury switched from the solid orange (or salmon) kill/stop wire to the standard industry black/yellow stripe wire around 1978–1979, coinciding with the...