I have an early 80's model b6100. Months ago when it was much cooler I started my tractor and heard a terrible squealing noise. It scared me and I immediately shut it off. After checking over everything I got my courage up to start it again. I let the glow plugs heat longer this time and it started without any unusual noise and it never happened again until the other day. It was hot /w3tcompact/icons/blush.gif outside and I did my normal start routine when it did it again. This time I fought my instinct and let it run to isolate the sound. The sound is comming from the right side of the engine near the fuel pump. The sound went away after 20-30 seconds. The best way I can describe the sound is like a screeching noise that a belt sometimes makes. It is not my belt however because it is new and tensioned properly. Am I correct to suspect my fuel pump is the culprit to make a noise like that? I can add a conditioner, but since this frightful noise happens so infrequent I'm unsure how to properly diagnose. Any thoughts or comments welcomed.
squealing noise at startup
- Thread starter RickM
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Gerald
Bronze Member
I would try removing the belt and see if anything it turns is
hard to turn. A new belt can make a noise if it's not the
right width for the pulleys, ie riding too low or too high in
a pulley.
The only noise I have ever heard a fuel pump make is a knocking
noise, but anything is possible.
Gerald
hard to turn. A new belt can make a noise if it's not the
right width for the pulleys, ie riding too low or too high in
a pulley.
The only noise I have ever heard a fuel pump make is a knocking
noise, but anything is possible.
Gerald
Hawgee
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I would look at the pulleys like Gerald said. You did say it was a older model. You could have enough metal wear on a pulley so as not to mate perfectly to the new belt.
I found a stethascope from Harbor Frieght Tools for less than $5.00 that can really help you isolate the noise. When the noise shows up again, try a large screwdiver against the side of the block with your ear on the end of the plastic handle. Cheap stethascope.
"What is a weed? A plant whose virtues have not yet been discovered."
Ralph Waldo Emerson (1803-1882)
I found a stethascope from Harbor Frieght Tools for less than $5.00 that can really help you isolate the noise. When the noise shows up again, try a large screwdiver against the side of the block with your ear on the end of the plastic handle. Cheap stethascope.
"What is a weed? A plant whose virtues have not yet been discovered."
Ralph Waldo Emerson (1803-1882)
_RaT_
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Rick, not knowing much about this tractor I will make a few assumptions. If you have a clutch then you probably must push it in, in order to start the engine. Doing so will engage the throwout bearing. The throwout bearing releases the clutch pressure from the pressure plate. In doing so it also must spin at the same RPM as the engine. Many times a temporary squeal can be from this bearing. (they get dry of grease or are worn) There are ways to test that. If it is not that, I would certainly suspect the belts as mentioned by the others. I too have never heard of a fuel pump squealing. For fuel pumps its pretty much they work, or they don't work. Rat...
gordon
Veteran Member
I agree with the others possible belt squeal.
If you have never used a stethascope or put a screwdriver to the side of an engine be prepared---it will sound like the moter is getting ready to come apart at any second. Because every little noise is so clear. Try it out on or when the engine is running proper to get a feel for what you will and or should be hearing.
Gordon
If you have never used a stethascope or put a screwdriver to the side of an engine be prepared---it will sound like the moter is getting ready to come apart at any second. Because every little noise is so clear. Try it out on or when the engine is running proper to get a feel for what you will and or should be hearing.
Gordon
Bud
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For a cheap scope get a piece of wooden dowel. Hold your thumb tight on one end and put your thumb in your ear. Put the other end at different places on the engine. The length of the dowel doesn't matter.
Bud
Bud
roysallis
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Even though it is a new belt you might try some belt conditioner. Also, are your sure it is tensioned properly? If it is too tight the bearings in the pulley may squeal when the pulley first begins to turn.
I hope you find the problem and it is easy and inexpensive to fix. Let us know what you find.
I hope you find the problem and it is easy and inexpensive to fix. Let us know what you find.
Anonymous Poster
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I HAD A B6000 LAST YEAR AND HAD TO REPLACE THE BEARING IN THE IDLER PULLEY. (BELT TENSION PULLEY) IT WAS CHEAP AND EASY TO DO. THIS TOOK CARE OF MY SQUEAL.
Keoke
Gold Member
Rick, if the squeal is ONLY heard at start up, then there is a good chance that it is coming from the belt being to loose for the alternator pulley. To be sure, just unplug the alternator field leads (skinny wires coming out of alt) and see if noise goes away. A cold alt on start up goes to full charge, if it's going to slip a belt, this is when it is most likely to do it.
good luck,
george, keoke
good luck,
george, keoke
Thanks to all those who have lended their thoughts. It has been over 3 weeks now and not another squeal has been heard. The funny thing is I have done nothing except re-examine my belt tension to confirm proper deflection. My tractor has no alternator. The idler pulley and fan/magneto pulley both seem fine. I start my tractor with the hood up now just hoping it will happen again so I can isolate the sound. If dry/worn bearings and and a slipping belt can be ruled out, what is left that might cause such a dreadful noise? Thanks again for any additonal thoughts.