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  1. J

    Mercruiser 470 crankshaft sprocket play on shaft

    Hi All, I had a knocking sound only at idle over 1200 rpm and you would not hear anything and the engine will run great at 3800 rpm. As soon as I drop it back down to idle. It sounds like someone is in there with a hammer. Sound like it was coming from the front of the engine. I pull the...
  2. J

    1999 mercruiser oil pressure drops bad after 3000 rpm

    Hi All, i have a 1999 mercruiser 4.3 serial #OL319690 i ran the boat first time this season and realized that my riser were bad and that my oil pressure was going down after 3000 rpm. between 5 and 10 psi. so far i replaced manifolds and risers also changed the oil because the level was...
  3. J

    mercruiser 4.3 alpha 1 gen 2 shift issue

    Hi All, i have a 1999 4.3 with alpha 1 gen 2 . it shift really quick into reverse but going in to forward the engine rpm goes up before it clunks into gear. i followed the adjustments of the cable everything was in spec. ( cable was set to 6" from barrel to center hole, slack in cable is...
  4. J

    mercruiser 5.7 fresh watter cooling

    Hi All, Happy new years eve !! just thinking of upgrading to fresh water cooling on my 2002 Mercuiser 5.7 L it has under 400 hours on it. Is it worth to install a new fwc kit (MFH 5320b) at this point ? just trying to figure out how much longevity this would add to the engine or is the...
  5. J

    2002 mercruiser 5.7 head reassembly

    Hello I need to find instruction on putting a head back on a 5.7 l mercruiser. Does anyone have torque specs for head bolts instruction .
  6. J

    Mercruiser 250hp 5.7L rpm drops by it self

    While cruising my engine rpm drops from 3800 to 3200 it never stalls. I putted along at idle for a little while and then got it back up to 3800rpm and everything was good for a while then the same thing happens. I unscrewed the gas cap to make sure my vent line wasn’t clogged up and problem is...
  7. J

    What oil filter ?

    Hello I have a mercruiser 470 which I have been using a ph 5 or the cross over of Napa which I believe is Napa 1060 I have a newer boat with a 2002 mercruiser 5.7 which filter should I use ? Now if I look up the mercruiser part number 35 866340 q3 which this part number fits both engines so...
  8. J

    2002 mercruiser 5.7 clacking sound

    it sounds like this https://youtu.be/HRyOwnhQwgE any help would be greatly appreciated
  9. J

    Mercruiser 5.7 250hp spark plug gap

    Hello any body know the correct gap for plugs head champion plugs new plugs are ngk serial number of engine m623660 thanks
  10. J

    470 knocking noise

    Hi guys the end of last season it starting to make a knocking noise at idle if I throttle it up noise goes away. Motor runs great except for the noise that only happen at idle. I pull one spark plug wire out at a time and the noise never went away. It sound like it coming from the front bottom...
  11. J

    Where can I find part # 68706

    Hello I need a new gasket for mercruiser 470 side cover but when I look it up it's no longer available any body ever just use rtv on this gasket thanks
  12. J

    Motor oil leak into bildge

    Hi guys My engines is leaking oil into the bildge and I really cant see where it is coming from but it's a pretty good leak 1 hour I lost about a quart I fill it back at. The dock did not run it and the next day I was still full so I think that would rule out a rusted oil pan I replace valve...
  13. J

    mercruiser 470 stalling at no wake speed

    hi everyone so I have a 470 with petronix ignition and the boat just started to miss and stall some times at no wake speeds if I throttle up a bit it runs fine at cruising speed fine as well I do have a fuel filter /water separator I just recently started putting in marina gas not sure if...
  14. J

    Mercruiser 470 weep hole

    Hi guys so last time I took the boat out I notice antifreeze in the bilge. Checked the weep hole and it was leaking I just replace the seal the beginning of last season. Wtf. It's a steady drip my club is going to have a boat run like 10 mile total. I was think about dropping the cap down to a...
  15. J

    470 valve cover gasket

    Anybody know the part number for the valve cover gasket and torque specs for 1984 470 also can I use a ford 460 gasket from autozone ?
  16. J

    Mercruiser 470 stalled

    Hi everyone I took the boat out for 16 mile run then while I was trolling in died I checked spark it seemed ok I also pump the throttle and 2 streams of fuel went in to the carb not sure how much or if it is not enough of one or the other any help is greatly appreciated
  17. J

    Oil leak from behind prop not prop shaft

    Hello I changed my prop today and saw oil all on the bottom its not coming from the shaft but further in I think from the carrier bearing from what I tried to find online how hard is that to remove and can I get it off easy
  18. J

    Does lower rpm mean better fuel economy ?

    hello all i just changed my prop to a 4 blade 18 p ( mercruiser 470 engine alpha 1 ) my question is does lower rpm meann better gas economy i now can cruise at 3000 rpm and be at 20 mph . if i go up to 3300 rpm i get 24-25 mph is it what would give me more fuel economy thanks jeff
  19. J

    Mercruiser 470 ignition coil

    Hi guys well on sat my coil let go it only last a year and half cheap coil from napa what is a good coil to replace it with . Iam still running points
  20. J

    Mercruiser 470 charging problem

    Ok guys last year my charging system was working but it would go up to 15 16 volt some time and then back down . This spring I did my cam seals and got a alternator conversion the Wagner kit uses the two bolt holes that the a/f res bottle mounts to . My problem is that I installed it and after...
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