1978 merc compression test after sitting 8 years

[stevehendo34]

Turns over, what should i do before taking compression check.

Have not bought it yet, $150 for motor and controls was set up for pontoon which I need.

I know how to check for spark and oil in lower unit and bent prop shaft.

 

[Scott Danforth]

Pull plugs, squirt a bit of oil in the cylinders. Take compression, then rebuild carb

 

[tommarvin]

Take all the plugs out, we have to ground our plug wires to block if you turn the key, what I just learned, you can do a compression with key off, and use a pull rope, you cant break anything this way, because you didn't buy it yet maybe.

How do you check for a bent prop shaft ?

They say all cylinders should be within 10psi.

Was there water in the LU, if so don't buy it. or low compression.

 

[Chris1956]

Gee, if that motor is an inline 6. it will have a distributor. Ign parts for it are expensive. Anyway to check to see if it has spark?