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Old 05-21-2018, 08:45 AM
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Engine Noise Question

I just bought an 89 Laredo a few weeks ago. There is a chirping sound from the engine bay, that speeds up/slows down with the engine speed. I think it might be the bearing in the fan clutch. On a cold engine you can turn the fan by hand, but you can't spin it at all. Anyone know a way to test or confirm?

Also, it is an 89 with 66K miles. I kind of think that I should change the water pump if I have the fan off. Maybe I should just pull it to inspect it. Opinions?

Usually I'd say if it aint broke don't fix it, because then it's usually easier to find the problem. But, my daughter is driving the jeep.

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Old 05-21-2018, 01:03 PM   #2
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If it ain't broke, I can fix it 'till it IS broke.

Are you sure the noise isn't a belt? Spray some water on the belts to see if the noise goes away.
Do you have a mechanics stethoscope? If so, listen to the alternator and possibly the PS pump.

Good Luck, L.M.

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Old 05-21-2018, 02:46 PM   #3
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What Mac said. Although fixing it until it's broke usually only applies to Harley Davidson.
If you don't have a stethoscope use a wooden dowel or long handled screw driver. Just rest it on everything and spinning (except the fan) and you'll hear a bad bearing.
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Old 05-21-2018, 02:54 PM   #4
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What 283 YJ forgot to say is put one end of the dowel on the suspected assembly and lean your ear against the other end.
This is done with the engine running, so if you have long hair, tuck it up under your hat or you might be in for a painful surprise. The same thing goes for loose clothing, although it might not be quite as painful.

Good Luck, L.M.
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"Wrangler....It's not just a vehicle, It's a lifestyle".
.................................................. ........................
1987 YJ-4.2L-Standard Shift- Re-manufactured Carter Carb-2" body Lift-31X10.5X15 BFG KOs-190K Miles No back seat.
HEI distributor with computer and all related relays and wiring removed.
12K Badlands winch with dual batteries.
Warn front bumper. Matching imitation Warn bumper on the rear.
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Old 05-21-2018, 03:05 PM   #5
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Old 05-21-2018, 03:43 PM
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Thanks guys! I'll give that a try.
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Old 05-21-2018, 05:16 PM   #7
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Quote:
Originally Posted by Luckymac View Post
This is done with the engine running, so if you have long hair, tuck it up under your hat or you might be in for a painful surprise.
Good Luck, L.M.
If you see someone with an ugly hairless scar on their head, they might have got their ponytail caught in a fan.
It's been over a hundred years or so since folks scalped one another.

During the '60s and early '70s I had shoulder length hair that I usually kept tied back in a ponytail. I got it wrapped up in a creeper wheel a couple times. It's pretty painful. I can't imagine how bad it'd be if it actually ripped my hair out of my scalp. I finally smartened up and got my hair cut short.

Good Luck, L.M.
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"Wrangler....It's not just a vehicle, It's a lifestyle".
.................................................. ........................
1987 YJ-4.2L-Standard Shift- Re-manufactured Carter Carb-2" body Lift-31X10.5X15 BFG KOs-190K Miles No back seat.
HEI distributor with computer and all related relays and wiring removed.
12K Badlands winch with dual batteries.
Warn front bumper. Matching imitation Warn bumper on the rear.
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Old 05-23-2018, 09:26 AM
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Well, the good news is that it is just a squeaky belt. I tried the screw driver thing and that worked like a charm. You really could hear a different noise from each bearing. Sprayed water on the belt and the noise went away. Guess it's time for a new belt. Here is a video I found to be useful.

Thanks for all the help.

https://www.youtube.com/watch?v=AEUe6uKxTv8

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