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140 hp
pounds of compression per cylinder
The rod bearing torque spec from mercruiser is 45 lb there is no spec that i can find for the main bearing caps.
3 - 4 per cylinder.
Around 230psi. Minimum is 170psi. I have the same exact car.
Mine is about 150
The year and engine size would help but you may have a bent valve or bent pushrod for # 4 cylinder if that is the only cylinder that has 0 for compression.
A compression check and cylinder leak-down test should tell you the condition of your engine.
On your Ford Ranger with the 2.3 or 2.5 liter four cylinder engine , with Fords twin plug ignition system : The compression plugs are on the DRIVERS side of the engine
Timing for Mercruiser 470 is 8 BTDC at idle speed. Mercruiser Service Bulletin specifies 4 degrees BTDC, due to new gasoline formulation.
Firing order is 1-8-4-3-6-5-7-2. Move #1 cylinder to where piston is up, and on the compression stroke (TDC). Easiest way to do this is with a compression tester on the #1 cylinder - rotor cap OFF. When you see the pressure build...you're on the compression stroke. The rotor cap should be at the #1 cylinder firing position...simply re-install the rotor cap at this time - noting which button is #1. Starting at #1 install the wire for the #1 cylinder onto the rotor cap...the next button (clockwise) on the cap should correlate to #8; the third button on the rotor cap is, cylinder #4..and so on. work your way around the rotor cap until you have all 8 cylinder wires in place...ignition coil wire in the middle button. Engine should start and run.
run a compression test on it should read about 150 i think bad head gasket or crack in head.