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  1. #1
    My Boats:
    96 Scarab 26
    Join Date
    Jan 2009

    502 Gen VI Block Oil Bypass Valve

    502 gen 6 block with OME remote filter and cooler.

    If I changed to a hi volume oil pump do I need to run a 30LB bypass relive valve? Is there already a 30 # in a marine block; are there 2 valves in the block? The reason I ask is I found bearing material in the pan but not in the filter...was it being bypass????

    I found this and I thought UMMM.

    Detailed Description
    Used on Gen V & VI engines when running an external oil cooler with a sandwich adapter between the block & oil filter. The 30 Lb valve compensates for the restriction caused by running an external cooler. Used in the location adjacent to the oil filter nipple on the oil filter pad. For standard non-sandwich adapter applications use GM # 25013759

  2. #2
    Gold Member Gold Member Turbojack's Avatar
    My Boats:
    2003 Eliminator 30' Daytona
    Join Date
    Sep 2001
    Houston, TX, USA
    There are a lot of threads on this. I had added to one where I had taken pictures of a block and had wires going thru the passages to show how the oil would go.

    I would bet you do not have the 30lb valve.

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