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  #1  
Old 12-23-2016, 04:07 PM
jink21 jink21 is offline
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Default Normal Engine Noise? Mazda B2500

Hi everyone.

I recently got a 1998 Mazda B2500 with the 4 cylinder engine and 5 speed transmission, to learn auto mechanics.

I just wanted to ask the more experienced owners on here for their opinion on what my engine should sound like. I find that the engine is pretty noisy and has a constant whirring sound but I am not familiar with these trucks, so I am not completely sure. I took 2 videos to show everyone.




Does this engine sound pretty normal? Or does a component need to be replaced/fixed?

The engine pulls pretty strong and the transmission shifts well. I just want to make sure the truck is in good condition. Thanks everyone.

Last edited by jink21; 01-20-2017 at 01:46 PM.
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  #2  
Old 12-24-2016, 03:38 AM
stateranger stateranger is offline
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Default Re: Normal Engine Noise? Mazda B2500

How's the power steering fluid look? A loud power steering pump is what I think I'm hearing.
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  #3  
Old 12-24-2016, 04:24 AM
ricochet ricochet is offline
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Default Re: Normal Engine Noise? Mazda B2500

Doesn't sound normal. Idler pulley? (Keeps the tension on the belt).

I also thought power steering - noise would get louder when turning the steering wheel...
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Old 12-25-2016, 09:42 AM
sheltonfilms sheltonfilms is offline
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Default Re: Normal Engine Noise? Mazda B2500

Wait for the engine to cool down, remove the serpentine belt and then start it up. Don't run it long (more than a minute) because the water pump wouldn't be pumping without the belt.

If the noise is gone then its a pulley or one of the accessories.
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  #5  
Old 12-27-2016, 09:46 PM
jink21 jink21 is offline
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Default Re: Normal Engine Noise? Mazda B2500

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Originally Posted by sheltonfilms View Post
Wait for the engine to cool down, remove the serpentine belt and then start it up. Don't run it long (more than a minute) because the water pump wouldn't be pumping without the belt.

If the noise is gone then its a pulley or one of the accessories.
Thanks for this advice, I took off the belt and the sound went away, so I'm guessing it's a pulley/accessory. I'm going to check it out after I come back from my winter trip. What should I be looking for in regard to the pulley/accessories?
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  #6  
Old 12-29-2016, 07:11 PM
tomw0 tomw0 is offline
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Default Re: Normal Engine Noise? Mazda B2500

Don't 'look', feel. Leave the serpentine off, and spin the different pieces. If one has a 'rough' feel, it may be bad. Check the idler or tensioner pulley bearings for smooth, easy spinning, along with the alternator pulley, power steering pulley, and possibly the A/C compressor pulley. I did not listen or watch, but that would cover all I can think of. Some tensioner pulleys can be replaced individually, but others require replacement of the pulley and the mount, depending on design.
tom
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Old 01-02-2017, 11:50 AM
jink21 jink21 is offline
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Default Re: Normal Engine Noise? Mazda B2500

Quote:
Originally Posted by tomw0 View Post
Don't 'look', feel. Leave the serpentine off, and spin the different pieces. If one has a 'rough' feel, it may be bad. Check the idler or tensioner pulley bearings for smooth, easy spinning, along with the alternator pulley, power steering pulley, and possibly the A/C compressor pulley. I did not listen or watch, but that would cover all I can think of. Some tensioner pulleys can be replaced individually, but others require replacement of the pulley and the mount, depending on design.
tom
Thanks for the help. I examined the pulleys today and I found that the alternator pulley makes some squeaking noises when I spin it free-hand. I'm trying to find a replacement alternator pulley but I'm not sure which one to purchase. Should I go Mazda specific or is it okay if I purchase one for a 1998 Ranger?
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  #8  
Old 01-03-2017, 07:20 AM
RangerRich96 RangerRich96 is offline
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Default Re: Normal Engine Noise? Mazda B2500

How many miles are on the truck? I'd get the alternator/charging system load tested. You may look into replacing the alternator, going off what you described as the sqeak when spinning the pulley. If it's squeaking then it's the bearings which are inside the unit itself. Replacing the pulley alone won't do you any good.

It's quite difficult to tell where the noise is coming from in the video but here's an old trick just have to BE CAREFUL. With the engine running, take a long handle tool(big screwdriver, piece of pipe, etc) and carefully place one end against the casing of the alternator and hold the other to your ear. If that alternator is suspect you will hear it immediately. Keep your hands, loose clothing away from any moving parts(think fan, belt/pulleys). There are 'mechanic stethescopes' which is the appropriate tool used to pinpoint noises but this is the crude way which works as well.
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  #9  
Old 01-03-2017, 08:21 AM
94mtx 94mtx is offline
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Default Re: Normal Engine Noise? Mazda B2500

It's fair to say that Ranger power steering pumps always whine. It's hard to tell with the audio quality you have.

With your belt back on, can you start it and turn the steering wheel from lock to lock and determine if the noise is coming from the same place?


My power steering pump is exceptionally noisy all the time so it's worth looking into.
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  #10  
Old 01-04-2017, 11:04 PM
jink21 jink21 is offline
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Default Re: Normal Engine Noise? Mazda B2500

Thanks everybody for the advice. I used a long torque wrench to listen to the engine components and I found that my alternator and power steering pump are both making noises.

I ordered a new alternator and should be here this Friday. I checked the power steering fluid and it was low so I'm going to be flushing out the old fluid and putting in fresh fluid on Friday as well. I will keep everyone posted on how everything goes, thanks everybody for all the great advice!
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  #11  
Old 01-07-2017, 09:08 PM
jink21 jink21 is offline
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Default Re: Normal Engine Noise? Mazda B2500

Quote:
Originally Posted by 94mtx View Post
It's fair to say that Ranger power steering pumps always whine. It's hard to tell with the audio quality you have.

With your belt back on, can you start it and turn the steering wheel from lock to lock and determine if the noise is coming from the same place?


My power steering pump is exceptionally noisy all the time so it's worth looking into.
I have eliminated the whirring noise from the bad alternator! The new one works perfectly but you were right, my power steering pump is super loud. I can tell because it is pronounced as I turn the wheel, but I am not surprised since the previous owner did not bother to put enough fluid in.

One question, while I was replacing the alternator, I accidentally pulled off a radiator hose and green coolant spilled all over the floor. I think it's the overflow hose. I tried putting it back on but I'm not sure if there is supposed to be a clamp over it, does this look right to you more experienced owners? I circled the hose in yellow.


Last edited by jink21; 01-07-2017 at 09:10 PM.
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  #12  
Old 01-07-2017, 09:43 PM
stateranger stateranger is offline
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Default Re: Normal Engine Noise? Mazda B2500

They usually don't have a clamp but I would add one just for preference.
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  #13  
Old 01-10-2017, 09:57 AM
RangerRich96 RangerRich96 is offline
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Default Re: Normal Engine Noise? Mazda B2500

Noisy p/s pumps are apparently "a Ford thing" as many put it. Seems to be a bit of a wisecrack in many GM forums. All three of my Mustangs I owned in the past had noisy p/s pumps. I remember some years ago I took my first Mustang which was an '86 to a local mechanic to have him look at the p/s pump. He said it's normal and handed me the keys to his Ranger and said start it up and rock the wheel.

Give the P/S flush a shot, I've heard mixed reviews on it but new fluid will only help. If you search around there is a specific method outlined in Ford shop manuals for the p/s flushing procedure to properly flush and remove any air from the system. Good luck
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  #14  
Old 01-20-2017, 01:49 PM
jink21 jink21 is offline
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Default Re: Normal Engine Noise? Mazda B2500

Hey everyone, thanks for all of the help.

I have replaced the alternator successfully and got rid of that horrible sound but alas that is not the end of the issues. I've decided to just live with the power steering pump and deal with it later but I keep hearing a whine/whistling sound when I am idling and accelerating.

Here is what I mean:

The first part shows the whistle at idle and the second part shows the whine when accelerating/revving.


I thought it might be the serpentine belt because it was pretty worn, so I replaced that but alas the sound is still there. Any ideas?

All of the support has been awesome, I truly appreciate it.
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  #15  
Old 01-27-2017, 11:46 AM
94mtx 94mtx is offline
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Default Re: Normal Engine Noise? Mazda B2500

It's a bit more pronounced than I am used to but probably the power steering. Check the fluid and bleed the air out of the system.

To bleed:

Start the motor, turn the wheel all the way to the right and all the way to the left a couple times, shut it off in the middle, and remove the cap on the power steering pump reservoir. You will probably have many really small bubbles make a froth on the surface of the fluid in the reservoir. Replace the cap, and do it over and over again until you get less froth and less noise.

Just one thing worth trying. It does sound about the same pitch as the PS pump...

Otherwise, go to the auto parts store and pick up and automotive scope. It will look like an old stethoscope with a straight metal rod instead of the old circular part (like when they listen to your heart at the doctor) and put it on each component while listening and revving the motor to see where it is loudest.
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