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hard to say not seeing it apart. May have been a bad rebuild. I guess had they done a compression test after install you would know. Possible you have a bad injector and cylinder is running lean? What does plug look like in that cylinder. looking at your photos you have dry exhaust which i have...

This is the mecury marine cast 6.2 not the older GM made 6.2. these newer marine specific engines were never used in cars or truck

Would also think these were sitting on the shelf before you got them or they got nicked installing them with the bellows expander tool. no issue using it with torn exhaust bellows as the exhaust is full of water at rest anyways.

Would put compressed air into low cylinder and determine if low compression is out the valves, crankcase ,or into the cooling jacket. if you have blowby the rings into crankcase the whole engine needs to come out. If its through the valves probably just the head. would look in exhaust and see...

the 470 and the rest of the engines in its 3.7 L family produced from 1976 thru 1989 would have been paired with MC1, R, MR, and alpha gen one drives. All use pretty much the same water pump, probably why they were prone to overheat

I would think a 17 or 19 would work with that application. Quite possible a 17 works well Especially if its a fiber glass boat ( heavier than aluminum). If i recall my neighbors growing up had a 17” on their startcraft bowrider that had a 120. You could have the pitch verified by taking it to...

Did not think the 3.7 tgat he is talking about came with belt driven pumps

Check the condition of your bellows while u are in there. if your bellows are close to needing it the oil line is real easy once the bellows are out of the way.

On an alpha drive there is no need to split the drive and remove the impeller for winterizing . to the OP i would check the water flow to the heat exchanger when in the water. Also use OEM impellers they last much longer than the aftermarket ones. i would suspect if u have low water flow u lost...

Did u test for 12 v on positive side of coil when this happens ? Could be the kill switch or key intermittently dropping out edit didnt see your last post, looks like u got a bad sensor then . Hopefully u get your money back.

You will likely have trouble getting out of gear especially when docking without the interrupt switch. It makes the ignition stumble when coming out of gear to unload the back cut dog clutch engagement teeth. With water putting pressure on the prop you may find that it will hang up in gear when...

If you are talking about locally sourcing a carb 1406 is the edlebrock automotive carb not rated for marine use you need a 1409 which is the marine version. if you are talking about locally sourcing a carb kit yes the kit that fits the 1406 is the same for the marine carbs and is commonly on the...

Those are exhaust flappers go in the top of the exhaust wye pipe . They do wear out but also get damaged by lack of water flow due to lack of impeller maintenance or blockage in raw water system.

Judging by the picture it is not the older GM / chevy 6.2 but rather the newer Merc made 6.2. if that is accurate then you can only get parts through merc or a marine salvage yard used engine i would call michigan motorz go over exactly what have they likely can get you set up with new and...

Send it. I had the same situation on when I repowered in 2016. Could never get the makes 100% textbook but tool goes in and out easily, went up and down adjusting mounts for hours. In the years since it has never changed and I have the drive sliding on and off like butter....

What boat model and year and approximate location? Do you have hull coverage on the boat yourself? If so I would talk to your insurance company as if you file a claim with them they will engage the other insurance company. I would start by looking up the blue book value of your boat and...

that should be the newer MC-1 drive. This drive would be compatible with the R/MR/Alpha GEN 1 drives if you need a replacement. Kenny gives great advice on what to check

You move the front of the engine up or down on the threaded mount on front of engine. Raise it up to get more grease on bottom side of alignment bar. #13 in the attached link is the adjustment stud https://www.marineengine.com/parts/mercury_marine_parts/sn/0B599492/%2001651337/908_180

You can only spin the prop CCW when in forward otherwise it will drop out of gear that way u can line up the splines

Yes on the grease witness marks Also forward gear for both controller and drive. You need to hold the prop CCW with a bungee etc to keep it locked in gear. You are turning the drive so it meshes with the splines on the coupler ?