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In your picture, the oring looks stretched and there is no silicone around the water ports. Did you clean the remnants of it? Are the Orings correct for the engine?

I have a '98 60* 150HPV6 Johnny. Although I have never measured the water pressure at the thermostats, the block water pressure is 35PSI at cruise. Water pressure is measured at one of the plugs on the port cylinder head. The thermostat springs are pretty strong and hold the thermostats in...

Often the quick disconnect on those engines goes bad. If you wanted to rewire it like OEM, you would need a suitable waterproof plug with two battery cables and about 7 other wires, that fit or almost fit the quick disconnector hole in the lower cowling. The other choice would be to use marine...

The early electronic FI systems on cars, circa 1980s, were pretty simple. They had a lookup table indexed by throttle position, air temp, RPM etc. The value in the look up table was a time interval to hold the injectors open for the correct amount of fuel. There was also an injector open...

Gee, I always found that boys will be boys and carbs will be carbs. Seriously, keep your fuel fresh, drain or run 'em dry when layup time and they should not need any work for a decade or more. Leave fuel in them or use old fuel and you will have issues. Just my experience.

Gee, prop shops press the hubs on and off all the time. Why not try a press?

Actually, after thinking about it some, I needed to split the brass hub on an alum prop that was seized to the propshaft splines. To do that I had to cut off the prop blades and the rubber hub. Then I split the brass hub with a cold chistle. I never had an impeller seize on me, but I think...

I prefer the decals on my '77 Merc 1500.

Gee, to be clear. You do not need to remove the pin on the upper shift shaft. I recommended you lift up on the upper shift shaft to verify the upper and lower shift shafts separate. It is very likely that the issue is the driveshaft corroded into the crankshaft.

It seems to me that I needed to split a waterpump with a cold chistle, one time. The insert is either brass or fiber, so it was not too tough.

Normally overvoltage would be caused by a low back voltage to the alternator. You might check for clean connections on the wiring from battery to alternator, and wiring harness to alternator.

You look to have 2 inline fuse holders and a circuit breaker (rusty). Not sure I understand the question

There should be other sources. Search on the OEM model number. Sierra used to make one. Surplus unlimited is another place to check.

If you look under the lower carb you should see the top of the upper shift shaft. It should come up, if the shift shaft coupler is not seized. You may need to remove the shift cable to pull the upper shift shaft up to prove it is not the shift shaft coupler. Sometimes the driveshaft rusts...

Actually, The PTT cylinders only attached to the orig. shock lower mounts. The shock upper mount bolts were used to bolt on a PTT cylinder bracket. You can see it in the pictures. The PTT cylinders upper mounts were at the top of the transom, whereas the shocks upper mount was about 1/2 way...

Unfortunately, what I found was that the aluminum alloy of the block was getting softer due to the saltwater exposure. Bolts would strip easier and some of the castings would get some powdered corrosion. I never flushed my engine because I kept it tied to the dock in saltwater, and there was...

Yes, the two ring pistons use a keystone-shaped ring. It is not compatible with the older 3 ring pistons. Most of the 1/4" bolts on the head of my engine could be drilled thru the block casting and a new bolt and nut installed externally. I probably broke 3/4 of them, since my motor was used...

To be fair, my '88 SeaRay had a layer of fiberglass over the stringers and foam that was under the deck. The bolts that held the seats to the deck were set in redwood or cedar blocks under the deck. That part and the stringers below were not rotted. Of course this was a long time ago. The OP...

It is certainly a 90* V4 motor. Does it have removeable transfer port covers? If so, it is a crossflow. If not, it may be a looper. You could search on the block part number. If no action on the web, you could look on crowleymarine at special V4 engines for a match on the block part...