1987 merc 3.0 litre problem????

Shawn79

Cadet
Joined
May 22, 2005
Messages
13
i have a 1987 merc 3.0 litre with a recent rebuild on the motor, have have been hearing a ticking sound wich i thought at first was exhaust related so i had the exhaust manifold and arm cheked out all is good . so now i open my valve cover and ajust my rocker arms, but when i put it back on the water the ticking sound is almost gone butt still there if i hit the throttle hard but it goes away!!!now the other fdasy i had it on the water running just great shut it down and it never fires back up, i am thinking that ping noise may have bean a spark ticking sound now cause when i started looking at the wires and they where very worn looked to be very old could bad wires cause this, p.s they carb was leting fuel into the barrels
 

oxbowman

Cadet
Joined
Jun 7, 2005
Messages
8
Re: 1987 merc 3.0 litre problem????

Could also have a bad coil. Start a night and check for spark jumping around the coil or plug wires.
 
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