Merc 350 engine knock..help!
#1
Merc 350 engine knock..help!
hey guys,
Little help.. my 350 mercruiser is knocking. Tried pulling each spark plug wire from the distributor to figure out if and which cylinder was causing the problem. Engine kept on knocking.
Here's a video of the sound.
Can anyone tell me where to look and how to fix this?
http://www.youtube.com/watch?v=VaDmeNrxidY
Little help.. my 350 mercruiser is knocking. Tried pulling each spark plug wire from the distributor to figure out if and which cylinder was causing the problem. Engine kept on knocking.
Here's a video of the sound.
Can anyone tell me where to look and how to fix this?
http://www.youtube.com/watch?v=VaDmeNrxidY
#3
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I'd use a stethoscope or large pry bar cupped to the ear. Either way, it's coming out. What color are the flakes in the oil? Copper - rod bearing. Aluminum- Piston issue. Seems to deep of a sound to be valve train related.
#4
Maybe a stuck lifter?
If it was a rod bearing it should have got quiet when you pulled the plug wire (or the 2 wires for a particular main bearing). Hows the oil pressure?
One time I started a 350 not knowing there was water in a cylinder, it hydrolocked bending a rod which caused the piston skirt to hit the crankcounter weight, also sound like that.
Just some other ideas
If it was a rod bearing it should have got quiet when you pulled the plug wire (or the 2 wires for a particular main bearing). Hows the oil pressure?
One time I started a 350 not knowing there was water in a cylinder, it hydrolocked bending a rod which caused the piston skirt to hit the crankcounter weight, also sound like that.
Just some other ideas
#5
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Maybe a stuck lifter?
If it was a rod bearing it should have got quiet when you pulled the plug wire (or the 2 wires for a particular main bearing). Hows the oil pressure?
One time I started a 350 not knowing there was water in a cylinder, it hydrolocked bending a rod which caused the piston skirt to hit the crankcounter weight, also sound like that.
Just some other ideas
If it was a rod bearing it should have got quiet when you pulled the plug wire (or the 2 wires for a particular main bearing). Hows the oil pressure?
One time I started a 350 not knowing there was water in a cylinder, it hydrolocked bending a rod which caused the piston skirt to hit the crankcounter weight, also sound like that.
Just some other ideas
Rod Bearing- of course it would still make that noise. Not under load, it's just flopping around. This isn't a car in gear.
Bent rod- you had water in the oil and still ran the engine?
Dude, pull the engine and stop making it worse.
#7
Stuck lifter- nope wouldn't make that sound.
Rod Bearing- of course it would still make that noise. Not under load, it's just flopping around. This isn't a car in gear.
Bent rod- you had water in the oil and still ran the engine?
Dude, pull the engine and stop making it worse.
Rod Bearing- of course it would still make that noise. Not under load, it's just flopping around. This isn't a car in gear.
Bent rod- you had water in the oil and still ran the engine?
Dude, pull the engine and stop making it worse.
Proceed to bash away.......
#8