mercruiser 7.4

Hello all, I have a 1996, made December 1995, Sea Ray 270 Sundancer fitted with a single engine that is a 7.4 LX MPI EFI with the Bravo 3 outdrive. (Engine serial OF764XXX) The issue I am having right now is a bit of a rough idle and when put into gear it will not rev past 1300 RPM’s. If I...

Hi All, I am new to Clubsearay, but from what I've seen in my short time browsing different subjects, it seems like there is no better place to go for trouble shooting. I purchased a 1999 34' Sundancer this past fall. It came with twin rebuilt (raw water cooled) Mercruiser 7.4 MPI engines. When...

With these Starboard engine compression test numbers.... what should I do??? .. the motor start hard when warm.. but if you goose the throttle a few times it does start and runs well. I have about 1300 hours on these Merc 7.4 Horizons 2001 vintage! 2 165 4 124 6 145 8 120 1 105 3 159 5 150 7 160

We bought her in June and don't have the engine manuals for our 7.4 Mercruisers - any idea where to get them? Thanks in advance!!!

I have a 4 season old (approx 200hrs) Mercruiser 7.4 L MPI that is currently in my 33' Sundancer. It is in drop in & turn key condition Fresh water cooled, New raw water pump (maybe 5 hours on it), 1 season on new Oil Cooler. Engine was purchased as a re-manufactured long long block with new...

I just blew my 1996 7.4 liter MPI/ 330hp and am looking for guidance. My mechanic told me I can buy a long block 7.4 liter or replace it with a brand new 383/ 350HP drop in. the 7.4 is a big block and the 383 is a small block and 150 ibs lighter. Would anyone know what is recommended or have...