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Whining Noise From A Wheel Down The Bottom Of The Engine

XY33

By XY33,
in Engines & Forced Induction

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XY33 Apprentice

XY33

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Hi, everyone, my r33 gts25 got the problem recently which the title described it, the noise is so loud, seems warning me to pay attention to it all the time, especially at low rpm.

When we look down at the front of the engine, there are two wheels connecting to the engine output wheel with belts, I guess the one at the top relates to the power steering pump and it's always working when the engine works, the wheel below it only works at a passage of time when the engine is working, sometimes it turns on for a while, then it stops (...I'm not sure whether this one is for the power steering pump...:rolleyes: )... and I noticed the whining sound is just made by it when it spins, also it sounds like something's stucked when it stops...

I can see the wheel spins and stops while idling, but I don't know what's it for and whether there's a big problem with it, does anyone know about it and how can I solve the problem? Thanks!

SargeRX8 Grand Master

SargeRX8

Posted
Posted

AC Compressor. Its a clutch driven system. It is on, then off, then on again etc to keep the car cool and remain economical. Its normal, they clunk as the clutch engages allowing it to spin the belt on the compressor and create the cool wind. You can often hear them engaging and disengaging even in the cabin.

Switch your air condition off and it wont engage.

From the front of the R33 going down from top to bottom, on the right you have the power steering pump, always spinning. Then abit lower to the left side of the car you have the alternator, also always spinning, I think this one also drives the clutch fan/water pump too. To the bottom on the right, under the power steering unit you've got the AC compressor. RIGHT at the bottom is the tensioner for the AC belt.

XY33 Apprentice

XY33

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  • Author
Posted

AC Compressor. Its a clutch driven system. It is on, then off, then on again etc to keep the car cool and remain economical. Its normal, they clunk as the clutch engages allowing it to spin the belt on the compressor and create the cool wind. You can often hear them engaging and disengaging even in the cabin.

Switch your air condition off and it wont engage.

From the front of the R33 going down from top to bottom, on the right you have the power steering pump, always spinning. Then abit lower to the left side of the car you have the alternator, also always spinning, I think this one also drives the clutch fan/water pump too. To the bottom on the right, under the power steering unit you've got the AC compressor. RIGHT at the bottom is the tensioner for the AC belt.

Thanks a lot man! I made some research from the type of the belt to know about it as well, I can always get some knowledge from this forum!!:thumbsup:

Btw, is your R33 making such noticeable noise while your A/C is on either? I'm just wondering how come I didn't notice it earlier as I've already owned it for one year...lol

Also, my R33 S2's power steering belt type is 3PK, I heard from someone that for S2, it should be 4PK which is wider than the belt on S1, is it true? Just confused about it, perhaps the PS pump had been changed before...

StevenCJR31 Veteran

StevenCJR31

Posted
Posted

Thanks a lot man! I made some research from the type of the belt to know about it as well, I can always get some knowledge from this forum!!:thumbsup:

Btw, is your R33 making such noticeable noise while your A/C is on either? I'm just wondering how come I didn't notice it earlier as I've already owned it for one year...lol

Also, my R33 S2's power steering belt type is 3PK, I heard from someone that for S2, it should be 4PK which is wider than the belt on S1, is it true? Just confused about it, perhaps the PS pump had been changed before...

sounds like your air con compressor could be worn out

XY33 Apprentice

XY33

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sounds like your air con compressor could be worn out

Could be...... I found when the day was cold, the heater worked very slow. eg: If I set the temprature to 32 at a cold day, it takes like 5 mins to start its job. during the 5 mins, sometimes I would suffering cold air coming out, sometimes it could be nothing.....lol

Today I drove my car the whole day, I found the whining sound was not only made by A/C compressor, there must be sth wrong with one of the other belts. I'm not sure whether it could be sth wrong with the new timing belt, as before I got the new one on, the creepy sound seems never existed... The sound was killing me especially everytime the car was idling...

I'd better go back to nissan dealer again to check it out, if it's the timing belt issue, must let them to fix it.

89CAL Grand Master

89CAL

Posted
Posted

Heater relies on the car being warm so it will only be warm when your temp gauge shows the water temp is getting near half way on the gauge

Better to test the A/C on cold settings

It could be the bearing in your A/C compressor. Or the Bearing in your idler (at the very bottom, it's where the adjustment is)

Remember that the A/C belt spins all the time but it may only make the noise when your A/C compressor clutch kicks in and there is load on everything. It may make the noise all the time however

Take the bottom cover off under the engine and get under there and try and listen where the noise is coming from.

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