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  1. tpenfield

    Pulled my Mercruiser 7.4L out of the boat today

    I pulled my 20 year old Mercruiser 7.4L (454) out of the boat today. It is in need of a top-end rebuild (valves and head gasket), so I thought it would be easier all-round if I pulled the engine. Here is a photo of the engine safely on the ground ready for tear-down. I did a leak test to see...
  2. tpenfield

    "Preferred" Cylinder Leak Test Procedure . . .

    Not sure if I will start a Holy war by asking this, but . . . I am wondering what the consensus is regarding the way to perform a cylinder leak test? It seems, by checking various publications and forums, that the popular way is to have the cylinder at TDC (top dead center) on the compression...
  3. tpenfield

    Cylinder Leak Test Results . . .

    I have been trying to diagnose an overheating issue with my 1991 Mercruiser 7.4L/Bravo 1 Having Checked all the water circulation issues to no avail, I did a leak-down test today. Here are the results: Cylinder------ Pct Leak L1-----------------8 % L3----------------35 % L5----------------48...
  4. tpenfield

    Finding Right Prop - Merc Revolution 4, Stiletto BP 2, Turbo Ultima 4 ???

    I have been doing lots (and lots) of research regarding a new propeller for my Formula 24 ft cuddy, and I wanted to get any first hand knowledge or expertise before I make a purchase. I currently run a 3-blade and I have been shopping for a 4 blade (stainless steel). Boat = Formula F-242 SS...
  5. tpenfield

    Electrical Terminal Post Disintegrating . . .

    Unusual thing is happening to 1 of the electrical terminal posts on my boat Boat = Formula F-242SS, Mercruiser 7.4L, Bravo1, Mercathode system, SS propeller Dual Battery set up with Group 24 batteries. The batteries are wired to a Perko 4 position battery switch (OFF, #1, Both, #2) normally...
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