Engine noise

pstew96

pstew96

Active member
Member
Joined
Dec 4, 2003
RO Number
12527
Messages
727
Running the engine to get the new oil flowing for winter I noticed a noise, sounds like a loose pully, but it isn't a loose pully. Anyone have that ever?
 
Its only got 100 hours on the motor... it is like a bearing sound also which sounds like a loose pully to me..
 
What year, make and size engine? Otherwise, one guess would be a worn turbo encabulator or spurr bearings connected to the wain shaft....:-)
 
quote:
Originally posted by pstew96

Click to expand...
I assume you had it in the water so burning up the impeller shouldn't be the issue?
Describe the sound is it a repetative squeaking sound or a rattling sound?

Bill
 
It could be a bad alternator bearing, water pump or a steering pump going bad, a better description of the noise is needed also try and localize the noise.
Bill
 
Its a 2004 Maxum 2400 has a 5.0 L engine, got it in August with 60 hours on it, I put 40 hours on it between then and now. I was washing the bilge area and pritzed the engine because it was a bit dirty. As I ran it to circulate the new oil, I hear a cycling kind of rumble sound comming from around the front water pump, probably the problem is what I think. I don't see water leaking from that area.
 
Sounds like water on the belt, V or Serpentine.
My older ’96 with V pulley’s were squeaking and the pulley’s had some rust on the inside of the V. Sanded with 150 grit paper then put on two coats of paint. They have been quiet since and there isn’t any “rubber dust” around the pulley areas.
 
No, no rubber dust, there is some rust though, I might try to sand that off. Thanks
 
What presently is the max deflection you can make on the belt? Usually should be less than 1/2" I believe but too tight will adversely affect longevity of the pulley shaft bearings.

If the source is not internal to the engine or drive, you might loosen or remove the belt to inspect for glazing spots and inspect the pulleys on the crank , alternator, water pumps and any PS pump or idler for rust and turn all pulleys by hand to check for abnormal resistance or "sticky" spots that could squeal at running rpm.
Also look for any wobble.

If the pulleys belt grooves are rusted , diligently clean as much rust off as you possibly can, carefully apply rust neutralizer and dry, and I suggest repainting with coats of hi-temp ceramic engine paint and letting fully dry before reinstalling the belt.

You can also use a stethoscope, dowel or long-handled screwdriver held to your ear and contacting suspect parts and areas to possibly localize the source.
 
Silly question, but were you supplying cooling water to the engine? If not you probably burned up the raw water pump.

meide
 
quote:
Originally posted by meide

Silly question, but were you supplying cooling water to the engine? If not you probably burned up the raw water pump.

meide

Click to expand...
That's the same question I asked earlier as well?
Bill
 
Get a piece of Hard Garden hose, 4' long, and use it for an Ear Trumpet.
Another good 'listening' device is a short piece of hard Wood Broom handle.
 
That sounds like a good idea, I will try a broom handle! Thanks!
 
Engine NOT running, try to wobble the pulley on the circulating water pump. If it wobbles it's probably the source of the noise. Least expensive one I could find back in July was West Marine, around $80.
If you can change a flat tire you can change circ pump on a small block Chevy.
 
You must log in or register to reply here.
Back
Top