Mazda B2500 Whirring Engine Sound - Ranger-Forums - The Ultimate Ford Ranger Resource

DOHC - 2.3L Duratec / Mazda L Engines Discussions and Topics specific to the Duratec 4 cylinder engines

LinkBack Thread Tools Search this Thread
Old 12-23-2016
Thread Starter
Join Date: Dec 2016
Location: Oregon
Posts: 2
Mazda B2500 Whirring Engine Sound

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? The belts seemed pretty tight, could it possibly be misaligned?

The engine pulls pretty strong and the transmission shifts well. I just want to make sure the truck is in good condition. Thanks everyone.
Reply With Quote
Old 12-23-2016
RF Veteran
iTrader: (1)
Join Date: Jan 2014
Location: Vancouver, BC
Posts: 7,257
Simplest test is to remove fan belt on cold engine and start it up, if sound is gone then check all the accessory pulleys, one is causing the noise.
You can only run the engine for 2 minutes without the water pump, but that's more than long enough to tell if noise is engine or pulley issue.

If you have mechanical radiator fan then it's fan clutch can also make that noise if it is stuck on full lock all the time.
Normal operation of fan clutch on cold start would be to make a "whirring" noise for 5 to 10 second then it will unlock and noise goes away.
To test start cold engine, then shut it off after 1 minute, open the hood and spin the fan blade should spin easily and when released it will continue about a 1/4 revolution.
If it is hard to spin and stops when released then fan clutch is bad
Reply With Quote

Related Topics
Thread Thread Starter Forum Replies Last Post
Whistling in the vents, mazda b2500 deddhead General Technical & Electrical 5 03-25-2011 09:46 AM
1998 Mazda b2500 - $2800 blnkstare Ranger Based Vehicles 3 02-11-2011 06:52 PM
Strange whirring sound when cruising. t0x1k General Technical & Electrical 0 11-20-2009 10:03 PM
Grinding "whirring" sound DanOzSTX General Ford Ranger Discussion 3 12-22-2007 08:02 PM
Whirring sound in engine compartment... Wertzy 2.9L & 3.0L V6 Tech 20 03-13-2007 11:35 AM

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

All times are GMT -6. The time now is 10:03 AM.