belt and Idler tensioner
#1
#2
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Cold engine
Pull off the belt from the pullies
Spin each pulley manually to see if one is bad
It can be tensioner or idler or alternator or AC Clutch pulleys making a noise
If you can't tell which one, START THE ENGINE, yes with belt still off
You can run a cold engine without water pump or alternator for 1 to 2 min. but no longer
Listen
Engine bay will be VERY QUIET with no fan noise
If you now hear the noise its coming from the engine
4.0l SOHC engine need to have the timing chain tensioners changed every 100k miles, not hard to do but needs to be done ASAP if there is ANY noise
Pull off the belt from the pullies
Spin each pulley manually to see if one is bad
It can be tensioner or idler or alternator or AC Clutch pulleys making a noise
If you can't tell which one, START THE ENGINE, yes with belt still off
You can run a cold engine without water pump or alternator for 1 to 2 min. but no longer
Listen
Engine bay will be VERY QUIET with no fan noise
If you now hear the noise its coming from the engine
4.0l SOHC engine need to have the timing chain tensioners changed every 100k miles, not hard to do but needs to be done ASAP if there is ANY noise
#4
Cold engine
Pull off the belt from the pullies
Spin each pulley manually to see if one is bad
It can be tensioner or idler or alternator or AC Clutch pulleys making a noise
If you can't tell which one, START THE ENGINE, yes with belt still off
You can run a cold engine without water pump or alternator for 1 to 2 min. but no longer
Listen
Engine bay will be VERY QUIET with no fan noise
If you now hear the noise its coming from the engine
4.0l SOHC engine need to have the timing chain tensioners changed every 100k miles, not hard to do but needs to be done ASAP if there is ANY noise
Pull off the belt from the pullies
Spin each pulley manually to see if one is bad
It can be tensioner or idler or alternator or AC Clutch pulleys making a noise
If you can't tell which one, START THE ENGINE, yes with belt still off
You can run a cold engine without water pump or alternator for 1 to 2 min. but no longer
Listen
Engine bay will be VERY QUIET with no fan noise
If you now hear the noise its coming from the engine
4.0l SOHC engine need to have the timing chain tensioners changed every 100k miles, not hard to do but needs to be done ASAP if there is ANY noise
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