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  1. ukstu

    1st time out, boggy?

    I had this just recently. Had put one of the plug leads on the wrong plug by mistake when I fogged the cylinders. Ran fine on idle when running up, only showed a problem when trying to put power on under load. Maybe worth a check..??
  2. ukstu

    Leaking carb

    Hi, Yes thanks for the reply, the leak is coming from between the gasket between the intake and the carb. I suppose I was wondering if this could just be a bad gasket or whether the is a leak internal in the carb. Is there anyway of testing the carb now I have it off to see if fuel is escaping...
  3. ukstu

    Leaking carb

    Hi all, I have a fuel leak from my carb. Enough to form a small pool in the top of the manifold. My initial thought is it will just be a poorly fitted gasket, however, you will no doubt know better than me. move attsched a picture to show where it seems to be leaking from (No’s 1&2, and pooling...
  4. ukstu

    Merc 5.7 bogged down under load

    Solved ( where’s that embarrassed emoji..?) HT leads for cylinder 1 & 3 round wrong way. where I had fogged the cylinders I had obviously mixed them up putting back on. Thanks as always for info and advice.
  5. ukstu

    Merc 5.7 bogged down under load

    I think I’m heading towards a carb issue to be honest. Think I might take it off, strip it, clean and rebuild. Not been done for a few years and may have some old fuel clogged up from sitting foe the winter. Going to go back down in the morning and re check all the basics first. only thing I do...
  6. ukstu

    Merc 5.7 bogged down under load

    Thanks for all the replies. yes it’s a vortec engine, and the choke has been mounted on a makeshift bracket. carb is 4bbl quadrajet. Fuel filter was new last week. Oil good, correct level and clean. I’ve not yet got my head around this new choke that is fitted, could you please point me in the...
  7. ukstu

    Merc 5.7 bogged down under load

    Hi all, I hope you may be able to offer some advice please. Engine is a Thunderbolt 5.7. Just lunched the boat for the start of the year. Took for a quick run and it’s really bogged down, no power. It rev’s freely in neutral and ram up on the muffs no problem. If i coached it up through the...
  8. ukstu

    Alternator belt screeching

    All removed and done today! 👍
  9. ukstu

    Alternator belt screeching

    I have yes, used a metal rule. However I didn’t check all three pulleys, will recheck all of them and that they all align, tht said, it could only be the alternator tht wouldn’t be straight wouldn’t it?
  10. ukstu

    Alternator belt screeching

    Hi all, Some advice if possible from your knowledgable selves. I have a 5.7 Alpha one. I’m getting the screeching noise from the alternator belt, one chewed up last year and threw itself off. ive tried adjusting and re-aligning but can’t seem to stop the noise ( and the fact that it is clearly...
  11. ukstu

    New engine run in

    Hi All, I have just had a new engine fitted as a blocked drive leg killed the last. Anyway,.. could anyone please advise on what the run in procedure for a new engine is please? ie. running hours at what revs and so on. Engine is a Merc 5.7 Vortec. ( So far, i do not know what the vortec means...
  12. ukstu

    Mercruiser 5.7 Alpha 1 overheat

    Hi All, I'd appreciate some of your advice if possible please. I have a 1991 Mercruiser Alpha 1 with approx 700 hours on that is used on salt water in the UK. I went out today and about half hour into our journey it overheated. I shut the engine down and awaited a tow back in. After about 2...
  13. ukstu

    Mercruiser Alpha one 5.7 Valve adjustment

    I'd like some advice from you that know better if possible please. I've had both heads off and am in the process of rebuilding. In the past, i have had problems setting the valves, no matter how i follow instructions etc.. I am under no illusion i am doing something wrong but can't figure out...
  14. ukstu

    Mercruiser 5.7 problems

    Hi all, I have read this forum for some time but never registered so first off, apologies for the first post being to ask for help. I currently have a Mercruiser 5.7 V8 with Alpha one (1989-92). I have had this engine for coming up 5 years. I have had an issue with moisture in the oil for a...
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