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  1. J

    Mercruiser 470. Overflow tank

    Hi guys as many of you know I did my cam seals and upgraded to alternator on my 470 . My question is I filled the riser /res. with a/f. And left nothing in the over flow tank I took the boat out and the over flow tank has a/f in it now . The next day I open the radiator cap and I was a little...
  2. J

    Flushing engine to get antifreeze out of oil

    Hi guys I have fix me mercruiser 470 but I have some frothy areas in my valve cover Is there some thing I should do before i launch the boat? I change the oil. Do I just run it a little then change oil again or do I use a flush in a bottle to help clean the inside of the engine ? I read of...
  3. J

    mercruiser 470 cam seals repair

    Hello Guys still dealing with this 470 i have been have a/f getting into my oil after finding out that my e/m riser was gasket was leaking i removed and fixed that pressure tested and that is ready to go back on the engine thanks to all the help i received from this site. Now i pressure tested...
  4. J

    mercruiser 470 riser gasket

    hello Iam having problems getting my riser gasket to seal up right i put a new gasket and it still leaks i even tried two gasket has anybody ever tried rtv sealant or any other kind ? And had good luck. I know merc says dry but thats not working for me thanks in advance
  5. J

    Mercruiser 470 pressure test

    Hello guys iam trying to find out why a/f is getting in my oil I took the exhuast manifold off .caped off the front hose coming from the head hooked up pressure tester to the hose coming from the intake manifold pressure tested and it holds 15 psi Aim I safe to say that my engine I.e head...
  6. J

    mercruiser 470 a/f in oil

    hello everybody Ive been dealing with this problem since last season a/f getting in to my oil i pressure tested the system and it loses pressure. last season i changed the exhuast manifold to aluminium one because i could not get the old cast one to seal up at the riser gasket. so i upgraded...
  7. J

    mercruiser 470 loosing a/f

    hi guys iam posting a new post because the other one was getting to long . any way iam losing a/f i changed my exhuast manifold and before i put it on it held 15 psi on the test bench . also I pressure tested the engine it held 15 psi for over an hour until i took the pressure test off . my oil...
  8. J

    alpha one water pump

    hello everbody wondering if any body ever used sierra of glm water pump kits of should i stick with mercruiser brand /alpha thanks in advance
  9. J

    Mercruiser 470 witerizing

    Hello. I have read that all I have to do is pull the after plug and drain the raw water and iam done . Is this true ? Last year my friend helped we did 5 gal of antifreeze thru muffs thanks again.
  10. J

    1984 mecruiser 470

    Hi guys ive been dealing with A/f in my oil for a while which i switched to sraight water instead of a/f changing oil alot !!! checked weep hole a few times a ran paper clip thru and never and water /a/f came out . it has a new riser my next step is headgasket any tips would be great thanks.
  11. J

    470 riser gasket

    hello guys has anyone ever use a sierra riser gasket on the riser of a 470 ? the one i pulled off was like steel in the middle and new one was green fiber material . i still am losing coalant and i dont know if its because of this thanks for help guys
  12. J

    a/f in oil 470

    Hey guys just want to make sure iam heading in the right direction iam losing coalant and my oil isnt milky on the dip stick but its getting higher i drain some oil out and it is milky . i checked weep hole and ran a paper clip thru nothing coming out . compression test came back good 135 to...
  13. 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.
  14. 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...
  15. 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...
  16. 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
  17. 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...
  18. 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
  19. 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...
  20. 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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