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  1. J

    470 head gasket

    well after hoping it was just the riser i found that iam getting a/f in the oil Is a head gasket from serria or mallory good or should i buy the mercruiser one. Also is it made by mercruiser or vict. thanks in advance for all the help jeff.
  2. J

    Mercruiser 470 exhaust manifold cracked

    Hello. I was losing antifreeze so I took off the riser/res. and found the divider in the manifold. Was cracked does any body know where antifreeze is suppose to be and exhaust . To me it looks like both side of that divider both go out the riser and o the leg into the river . So why is it...
  3. J

    470 head gasket

    Hello does anybody have instruction on doing a head gasket with pics . I took my boat out and when I got back I check the oil and it looks milky and my antifreeze was empty but was full when I left the dock and oil was normally . Also I never over heated the day was 96 degrees and temp never...
  4. J

    470 valve cover gasket

    Does anyone know if the 460 gasket will work or should I use a mercruiser one ? Also what is the torque spec for the valve cover
  5. J

    470. Oil coming from valve breather tube

    Hello. I have oil coming from valve tube to carb when I run the boat . oil level is just passed the last L of full . So it's a over filled by 1/4 inch on the dip stick . Can this cause this ? Also when I take the oil fill plug out there is a lot of pressure coming out of it . And inside looks...
  6. J

    470 pressure in valve cover breather tube

    Ok so I pulled off the hose to the spark arrester and there is a lot of air flowing out of valve cover if I open the oil fill same thing also looks like some moisture was on the cap compression test was good all cyl are 145 to 155 Anybody know if this is normally thanks in advance
  7. J

    470 idle problem

    Hello. My 470 will runs good but does not idle good if I throttle it up it runs good but when I go in to neutral the rpm is between 750 to 800. For about 2 min then goes down like 400 500 rpm engines shakes . If I rev it up a couple of times it idles good for 2 to 3 min then back down any ideas...
  8. J

    470 idles rough but runs good

    Hi guys my 470 started to shake after running on plane at 3500 rpm got back to the dock and at idle it shakes and moves a lot if I trottle up then back in to neutral it's fine for little bit then starts to shake and idle rough some times stalls I changed plugs wires coil cap rotor all before...
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