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Unread 05-25-2015, 06:17 PM   #1
phljeeper
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2004 TJ Wrangler 
 
Join Date: Oct 2013
Posts: 92
04 Rubicon Engine Help

I Have an 04 Rubicon with 88k miles and have an issue with the motor running loud. It is the same sound when I first start the motor and it has a roar sound when going over 2500 or so RPMs except it never goes away. It seems like whatever typically warms up and settles the engine isn't recognizing that it is warm. Oddly it is the first warmer days we have had so I assume the engine is warm. Any suggestions on what to check? What causes the roar when the engine is cold and what triggers to settle the engine/fan?

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Unread 05-25-2015, 06:19 PM   #2
phljeeper
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2004 TJ Wrangler 
 
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Quote:
Originally Posted by phljeeper
I Have an 04 Rubicon with 88k miles and have an issue with the motor running loud. It is the same sound when I first start the motor and it has a roar sound when going over 2500 or so RPMs except it never goes away. It seems like whatever typically warms up and settles the engine isn't recognizing that it is warm. Oddly it is the first warmer days we have had so I assume the engine is warm. Any suggestions on what to check? What causes the roar when the engine is cold and what triggers to settle the engine/fan?
One note, I wheel the jeep so the motor gets a lot of mud in it. Possible something is clogged?



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Unread 05-25-2015, 06:26 PM   #3
Jeepsr4me
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Sounds like the engine driven fan is locked up..

Can you spin it by hand with engine off?



NO WAY IN HELL would you catch me in mud with a rubi.... Mud is the devil..
Buy a beater for mud..
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Unread 05-25-2015, 06:31 PM   #4
phljeeper
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2004 TJ Wrangler 
 
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Posts: 92
Quote:
Originally Posted by Jeepsr4me
Sounds like the engine driven fan is locked up.. Can you spin it by hand with engine off? NO WAY IN HELL would you catch me in mud with a rubi.... Mud is the devil.. Buy a beater for mud..
I thought the same thing. Yes, the fan spins with some resistance with the engine off. It is spinning with the engine on too.

Why wouldn't you take a Rubi TJ in the mud? It was made for rock crawling and mud. I don't take my JK in the mud but my TJ loves it.
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Unread 05-25-2015, 07:08 PM   #5
Jeepsr4me
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With a cold engine it should free wheel about a turn and half if you try to spin it.


Again mud is evil and in no way fun.. It destroys components
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Unread 05-25-2015, 07:30 PM   #6
JFM626
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2004 TJ Wrangler 
 
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Location: Tyee Capital of Canada
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Well all that dried mud will act as an insulator for sure. It might help if you clean the radiators with water. The mud will be caked in between the fins, cutting dwn the air low considerably. You have to be carefull though with your water pressure, or you will bend a lot of fins. The safest way IMO is to hose it down, let the water penetrate the mud for a bit, then hose it down again, repeat untill clean. Or you could just take out the rad to clean it; would also give better access to the air conditioning condenser.
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