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  1. K

    Volvo Penta 5.0 GL Compression Tolerances

    Hi, I didn't use my boat last season and when I winterized my 2001 Monterey with a Volvo 5.0 GL had 85 psi on cyl # 5. I added Marvel Mystery oil in the oil when I changed it then directly in the cylinder right before I stored it. I just tuned it up and have it now at 140 psi so the issue...
  2. K

    OMC Cobra - Engine Stalling

    I'm hopiing someone has a good answer for me. I have a 72 Mako with a 87 OMC 5.0L. At crusing speed and below the engine runs great. At higher RPM & speed she stalls out. I replaced my fuel filter (which was new) and there was some sediment in the one I replaced. 1/2 the gas is new the other...
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