454

  1. DreamstateSeven

    1990 7.4 / 454 - Coolant / Heat Exchanger Mystery

    Hi CSRs! Been lurking on here for a while, and this community has already helped me figure out a bunch of stuff for my 1990 270 DA and 1980 260 DA. But now the 1990 7.4 L Mercruiser is having a strange coolant issue that has me stumped. When the engine runs up to temp, the coolant recovery...
  2. Harborite88

    7.4 Horizon 380hp V drive noises

    Hey guys, this is my first post but I've been looking for a boat for a while and I think I finally found one, it is a long ways away so I've been doing everything without physically seeing the boat yet. It is a 1998 330 Sundancer with less than 500 hrs and I had the survey done today. I haven't...
  3. O

    Old ZF/Hurth transmission

    Hi, Quick question. My old transmission on my 1989 Merc 454 I think is low on oil but I just need to know when I put the dipstick in should I screw it all the way in and than measure it or just put it in and pull it out without threading it in. And also do you have a recommended oil to use in...
  4. O

    454's Rebuilt with White Smoke and Low Oil?

    Hi there, I bought this boat with 15 hours on Rebuilt engines, and was confident as I got to see the entire invoice leaving the previous owner paying $20000 in the end. So far have had no issues and have about 100 hours on them since rebuild but when I checked the oil yesterday I noticed...
  5. O

    340 Sedan Bridge

    Hey there, I Have a 89 340 Sedan bridge and am just looking to see if anybody out here has my boat (an 88 or an 89) or even if you would have a 340 ec in my year it would have similar things. Or a 305 SB (88 or 89) Send me a message here or just comment on the post and I'll message you...
  6. O

    7.4 Rochester Carb Choke Issue

    Hello CSR! Hoping somebody would be able to help me with this... I have a choke issue I believe in my twin 1989 7.4 454's with I think Rochester carbs. If you look at the photo I'm pretty sure the choke flap is supposed to be completely closed not half way like mine is. Is there a adjustment...
  7. O

    7.4 454 Throttle stiffness adjustment!

    Hi there, Quick question. Just seeing if anybody knows how to adjust the stiffness on my throttle as it backs off slowly while on plane so I have to keep my hand on it all the time. It's a 1989 Sea Ray 345 with twin mercruiser 454's with the generic separate throttle and shift. Thanks!
  8. O

    Sea Ray 345

    I am looking at a 1989 sea ray 345 for sale on yacht world. I went and looked at the boat and had a really really thorough look through the boat and I couldn't find anything too bad. Only problem was the door to the master stateroom would clip the frame on the top and would not close. Its easy...
  9. Wardy549

    89 268 w/single 454 Merc Carb help please

    Ok, so in the beginning my boat would fire right up idle great and at around 2000 rpm it would fall sputter choke etc. I took the carb apart and it was clogged up and rusty spring and ball within. I bought a rebuild kit and installed. Then I could not get it to fire. So thinking I messed it up...
  10. Wardy549

    Wot falls on its face

    Fellow classics, my 454 falls on its face at higher rpms. Running quadrajet carb. Cleaned, new cap wires plugs etc. timing set at 8*. im scratching my head as to what it could be. any pointers. fires up quick idles and runs great. So i dont know. thank you!
  11. A

    MCM 454 to MIE 454 compatibility

    Hi, I have a sea ray sundancer 290 - 1996. Last year my engine, Mercruiser Bravo-II, MCM 454 7.4l gave up and I am now looking at replacing it. I managed to find a Mercruiser MIE 454 Magnum MPI 7.4l (385 hp) that was recently renovated/serviced at a good price. However, as I realized that...
  12. R

    Engine temp question

    Hello all, hope someone can help me, I have a 1990 350 sea ray EC with 454 mercs, raw water cooled, are my engine temps ok??, I am attaching pics of my port and starboard engines, running at 2500 rpm. The boat have been running great for almost 90 hours at those temps, since I bought her last...
  13. B

    1994 SeaRay 290 SD Single versus Twins Advice Needed

    My wife and I are/were in the market for a early model 290 for Lake of the Ozarks. We have found a boat we both love that is in amazing condition. 1994 SeaRay 290 Sundancer with 450hrs Our only hesitation is with the Single 454 W/Bravo III. We were thinking for this size boat we would...
  14. T

    Need help on 1997 370 motor replacement

    Hi , my name is Tom and i am was just lucky enough to purcahse a 1997 370 sundancer that needs new engines. The former owner started to dismantle the old ones so really not even a good core between the two. The trannys seem ok. These were Generation 6 454 7.4 carb motors. My question is...
  15. S

    7.4L 454 Engine Start-up... Is this Normal?

    I purchased a '96 270 Sundancer a few weeks ago and it has a 7.4L motor in it with low hours (about 300 original hours). I'm curious to hear your feedback on these two questions: (a) What is the "proper" start-up procedure for a big ol' carbureted V8 with electronic ignition? (b) How long...
Back
Top