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Online pics give me the impression transom should be able to be done without removing cap. These are just exterior pics

Normal operating temp's are what ever thermostat temp is installed in the motors. Gauges can be off compare the actual temps of the motors with a IR temp gun at the thermostat housings. What are the water temps you running in?

How is compression?

Welcome There are a lot of different wellcraft's might want to tell us which one? And a rebuild thread without pics is worthless (n)

This would keep power to the coil even with key off, needs to be removed Suggest remove every wire that is not in the drawing.

Being a 1978 and seeing one relay the wiring should be like this There should be no connection between the top larger terminals (Red and Blue in pic) I see a fuse across those and that should not be there (was able to enlarge) No that is not happening

I'm not able to zoom in on pic so not clear of all the connections

Something is miswired. The brown wire should have no connection to the trim pump

If the bearing gets cocked even slightly it will dig into the housing. Sometimes its best to hammer it back in and see if there is a ridge I know this would be older transom then 1980, but does yours have a snap ring holding the bearing in?

Most boats come with the 1.5 unless their real heavy. Props would be in the 19 and 21 pitch. The 302 not being a power house and a 25foot boat, I would go with the 19

Sounds like you have it centered Put some grease on the end of the tool. Push in until it stops, pull it out and see if it's high or low

Yes, Merc is the only place and it takes someone with access the the data base to get the info of ratio.

You didn't mention which drive but I'll guess it's a R or MR but motor needs to come out, and while your at it check the transom https://www.mercruiserparts.com/bam/subassembly/30872/2203/40

Then you should be good to go

Does the timing advance when rpm's increase?

Welcome Moved you to OMC Have never seen a belt driven water pump on a 3.0, can you post a pic?

From you Remove drive, put in gear Rotate drive 10 times counting drive shaft and prop shaft rotations. This will give ratio

Oh you have 3 strand and that's different Might need a long splice

Welcome I'm having a problem with Should be one brown going to interruptor Other goes to the Tach The interruptor has nothing to do with the trim pump

Everyone will need to know what drive, Alpha G1, G2, Bravo Hey @Bt Doctur might be up your alley