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I hope not

3

300jk

Well-known Member
Well I had to move my 300 today so I could move our camper. I used it during the week blowing snow. I didn't notice anything then. I started it today and it sounds like I have a nocking noise coming from the front of the engine. My brother was here and he couldn't hear it. I can. Varies in speed with engine rpm. Oil pressure is good. 45 lbs. Hate to run it with the noise so I guess I will bring it in and drop the pan to see if I can tell what's going on. Haven't tried the screwdriver to the ear yet. It also sounds like maybe a bad water pump bearing. Pump isn't leaking though.
 
I am looking at them now. Belts are nice shape. Wish it was
that easy ! Thank you ! At first I thought it sounded like the
water pump. Still kinda does. Can the pump go bad and make
noise without it leaking ? It does not run hot and you can
watch gauge and see it come to temp, then theromstat open and
temp drop. Any info is appreciated. I did go through the
engine a while back and not sure what's going on.
 
Consider a piece of carbon or a screw from the throttle/choke plate getting on top of a piston. Nasty noise, no real problem with the engine parts. Use a bore scope or fiber optic viewer to look at the tops of the pistons through the spark plug holes. Jim
 
Could be lots of things but a camshaft gear with a loose hub will make a noise like that. Noise sometimes changes as you load the hydraulics if so.
 
My M last year had a similar sound at the rear of the engine - turned out to be the manifold gasket leaking at #4 cylinder. I could feel exhaust coming out.
 
(quoted from post at 05:18:54 12/03/18) Consider a piece of carbon or a screw from the throttle/choke plate getting on top of a piston. Nasty noise, no real problem with the engine parts. Use a bore scope or fiber optic viewer to look at the tops of the pistons through the spark plug holes. Jim
Click to expand...

My uncles 300 swallowed its spring loaded back-fire valve that sits in the choke plate a couple months back. Engine is not in real great shape he just revved it up and it must have moved through because it quieted down. I really don’t recommend that approach, just letting you know it is something else to check. I’m not there to hear it but a rod bearing knock is usually louder while the engine is coming up to speed when the throttle is opened. Also you can see if the sound changes when you pull individual plug wires to find which cylinder is the problem. It will be quieter when the offending cylinder is not firing.
 
I had a tractor swallow a choke plate screw once. It was a two banger Deere with horizontal pistons so the characteristics are different. It knocked only when revved up, no knock at idle. It ran this way for maybe ten minutes, then an exhaust valve stuck open for one pop as the screw went out the valve and the knock went away.
 

Oh, I should mention, this knock was very audible even from a tiny screw bouncing around on a big piston.
 
You didn't mention if it was a utility with loader or row crop.

The utility has a front pump with some models of loader.
Could be the pump drive.
Jim
 
Like about 40 yrs ago was mowing pond dam covered with thick Bermuda , 8 inches high. Had in 1st gear with brush hog low. Had to go wide open to kep from stalling. At once tractor started knocking . Got back to barn , found noise in 1st cylinder using 1in. Heater hose to listen with. Took head off, Carb screw imbedded in piston. Removed an back together. Good for abt 40 yrs now . No problems ever since.
 
(quoted from post at 20:31:44 12/04/18) Like about 40 yrs ago was mowing pond dam covered with thick Bermuda , 8 inches high. Had in 1st gear with brush hog low. Had to go wide open to kep from stalling. At once tractor started knocking . Got back to barn , found noise in 1st cylinder using 1in. Heater hose to listen with. Took head off, Carb screw imbedded in piston. Removed an back together. Good for abt 40 yrs now . No problems ever since.
Click to expand...

My brother turned wenches his whole life and he thought the 1" heater hose was the best for pin pointing noises from the engine.
 
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