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  1. M

    Mercruiser 470 low compression on cylinder #4

    I had water in oil of my Merc 470. After some diagnosis and tests decided to change the head gasket and service the head. Machine shop resurfaced the head, and said no crack or other issues found. Put the head back on with a new marine head gasket (put Sierra gasket not Merc!). Had a little...
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    Valve lash adjustment on Mercruiser 470

    I am in the process of servicing my Merc 470s head. Got the head back from the machine shop where they tested it for crack and resurfaced it. Installed the head as per service manual. My question is do I have to adjust the valve lash since I disassembled the rocker arms and push rods? or in...
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    Exhaust manifold port corroded (Merc 470)

    Hi I am in process of servicing the head on my Mercruiser 470 and consequently had to remove the exhaust manifold which is an aluminum type. Once out, I found some corrosion on the port number 4 of the manifold. Basically after sanding the corroded flakes, now less than half of the diameter of...
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    Mercruiser 470 head and gasket inspection

    Hi everyone I am in a Merc 470 water in oil situation. I get water or coolant (not sure yet) when running engine on muffs. Since I knew at least one case of engine overheat event had taken place, I decided to service the head anyway. Can someone have a look at the attached 2 photos of the head...
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    Mercruiser 470 raw water in oil

    Hi, My dad got a 1987 Searay with Mercruiser 470 (165hp closed cooling - Serial# B624565) that been sitting for a few years. Couple of weeks a go we decided to run it. We put fresh gas and it started right up! after burning all the fogging crap (lots of white smoke) engine was running very...
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