Sick 7.4l

[yeahBUOYbeeeaaaaotch]

With these Starboard engine compression test numbers.... what should I do .. the motor start hard when warm.. but if you goose the throttle a few times it does start.

I have about 1300 hours on these Merc 7.4 Horizons 2001 vintage!


2 165
4 124
6 145
8 120

1 105
3 159
5 150
7 160

 

[Bondo]

the motor start hard when warm.. but if you goose the throttle a few times it does start.

Ayuh,..... Welcome Aboard,..... Don't post in old threads, older than 90 days, much less 8 years old,.....

Is this carbed or Efi,..??

 

[Rick Stephens]

Time for a leak down test.

 

[Scott Danforth]

First.....Welcome aboard

my guess...cylinders 2, 3, 5, 7 still have water in them
cylinders 4 and 8 have rusty valves and rings
cylinder 6 seams to be OK

or your gauge reads 15psi high
then cylinders 2, 3, 5, and 7 are fine and 1, 4, 6, and 8 have rusty valves and rings

is this a new to you boat?

is this a salt water boat?

as Rick mentioned, time for a leakdown test.

 

[tpenfield]

+1 to the leak test