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Multi port injection - individual injectors for each cylinder. EFI in mercruiser speak is throttle body injection two injectors for entire engine

IF the current ignition is in good shape why are you replacing? Since you say amplifier I assume you have Thunderbolt 4 ? If so you wont gain anything and likely loose reliability with offshore stuff. Only reason to replace wires is if they dont fit new system or you have high ohms and they...

so it is pushing back to the heat exchanger? is so either exhaust outlet is blocked or elbow is rotted through. Elbow is raw water so if in salt should be a wear item. would be leaning towards blocked exhaust outlet as rotted elbow would probably not create back flow of exhaust. if the...

the hose from the heat exchanger to the riser (elbow) should have water in it not exhaust. this is how the spent cooling water goes over board. there should not be any back pressure from exhaust pushing against thre cooling water discharge - is the exhaust flapper blocking exhaust flow down the...

Doesnt take any longer for water to come in via u joint bellow than shift bellow. there is a drain hole from bellows thru transom housing into bilge at bottom of bellows. Trick will be that depending on where bellows are leaking steering and or tilt position can influence the leak. as others...

As bondo said if it is a qjet off a 4.3 it would just be a matter of rejetting. if it is a 600 cfm webber or mercarb you will be down on power but may run all right otherwise If you want a bolt on replacement a Edlebrock 1410 shoudl work nice but may be some issues to sort through on manifold...

make sure all the water gets out of the bellows and it dries. normally when i have seen water ruin stuff is if its sits over the winter. I really hate the sealed bearings I just replaced my original greaseable one on my 04 alpha gen 2. chasing a slight vibration not even sure if it was bad...

the 14 mm or 9/16" play in cable measures the lower cable for stretch. if too much play you need to replace the cable. This is done my measuring how much it moves by hand. Unless the cable is newer would s this is your issue the slot on the reverse lever is only used if you cannot get into...

Great, your parents must be proud. On a cast block what the op shows is totally normal

Best video I have seen on it.

Typical of any raw water cooling system used in fresh water. Knock off the big stuff and use it.

Easy to miss align the tube. Would think the water would come out the prop exhaust if this were the case... on a gen one you can mess up the plate and gaskets below the pump and have no flow ( remember the key on the shaft...) Also there are some type of restrictor in the T above the thermo...

you might be able to by clamping off the line tot he reservoir. The gasket for the outdrive is like $10-15... pretty cheap to know it holds pressure. if you hadn't done the shift shaft seal I would look closely at that. I got a fishing line in prop seal of my 2004 vintage gen 2. So I re-sealed...

I would think hose clamps on cooling system, exhaust pipe to transom housing, transom seal (housing to hull) , core plug in engine

when you say it was running - this spring or it was running last year and now you are trying to get it water ready? What does the gear oil look like?

I assume every 90 degrees following the firing order?

easiest way is to take off valve covers take out spark plugs and rotate by the balancer. when both the intake and exhaust valves are closed then you can do the leakdown test on that cylinder. Im sure if you look online someone can tell you the orders of cylinders to do it off TDC on number one...

thats pretty normal lean back so you dont mousetrap....

The wires are for the trim gauge and or limit switch. Common they get brittle and break. By gen one alp h drive had a separate pito on the transom for the Speedo. Mor often than not speedos don’t work …

The digram does show what look like metal sealing washers where the jets seat so I would get them this may not be for your exact engine but part 30 is a gasket kit looks like for whole carb...