5.7 Mercruiser Lifter or Exhaust Noise and Power Loss

[ewpvic]

I was showing my old boat to a potential buyer, when I noticed what sounded like a noisy lifter as I throttled up. The noise got louder and more "throaty" sounding and the boat wanted to lose power at around 2600 rpms. Oil pressure and temp were normal. I limped it back to the dock at "no wake" speed.

Everything I have seen and read makes me think exhaust manifold gasket, but........??

Any help appreciated. This guy really wants the boat.

 

[Bondo]

Re: 5.7 Mercruiser Lifter or Exhaust Noise and Power Loss

Ayuh,.... Welcome Aboard,.... Did ya check the oil,..?? the level Ok,..?? color,..??

How old is this old boat,... Vintage matters,...

What carb on the motor,..??

Got a serial number,..??

 

[ewpvic]

Re: 5.7 Mercruiser Lifter or Exhaust Noise and Power Loss

1982 Mercruiser 5.7, Rochester 4 bbl. Oil is fine. SN on Title is incorrect. Don't have the one off the engine. This ticking just started all of a sudden. I never run it above 3200.

 

[alldodge]

Re: 5.7 Mercruiser Lifter or Exhaust Noise and Power Loss

May want to do a compression test. If you don't have a serial number (look starboar side above the starter) how about a year

Edit starboard

 

[ewpvic]

Re: 5.7 Mercruiser Lifter or Exhaust Noise and Power Loss

It's a 1982 Mercruiser 5.7. I won't get down to the boat until tomorrow afternoon.

 

[alldodge]

Re: 5.7 Mercruiser Lifter or Exhaust Noise and Power Loss

It's a 1982 Mercruiser 5.7. I won't get down to the boat until tomorrow afternoon.

Your correct starboard