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Old 06-14-2014, 10:15 PM   #1
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4.0TJ (video) - Raspy/Rattle noise from engine

Gents,

For some reason I thought I had an account here but there's nothing linked to my email.. I have a wrangler I've been fixing up and am through all of the regular maintenance and real problems. I'm trying to fix the little things now that I didn't really notice before.

1) Raspy/rattle noise from engine when running. Mileage is 73K but the jeep is a 98' so maybe age has something to do with it. I think this is valve noise due to an out of tolerance timing chain. Is this a good conclusion? The timing chain has never been changed. It had a cracked exhaust manifold but I fixed that and there's no exhaust leak now.

Raspy 4.0 wrangler 1998 - YouTube

2) Ticking noise on shutdown. I believe this is coming from the hydraulic lifters from the youtube consensus but I don't know that this needs to be fixed? On shutdown I also hear a draining fluid noise that I believe is oil draining into the oil pan, also nothing to worry about?

Sound at shutdown 4.0 wrangler 1998 - YouTube

Oil was just changed with M1 FS 10w30 and twice prior with conventional 10w30 (various brands) and I believe these noises were present the whole time.

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Old 06-14-2014, 10:21 PM   #2
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Using Bose ear pieces sounded good second vid didn't here nothing. The transmission on sticks makes noise in neutral if ya got one.

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Old 06-14-2014, 10:54 PM   #3
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It is a manual. The engine sounds and runs good, just a constant rattly sound when it's running. The transmission might be making this noise?
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Old 06-14-2014, 11:11 PM   #4
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You can try using a piece of wood and "listening" to various areas of the motor to pinpoint where it's coming from. Think of it as a poor man' stethoscope. A Small 1x1, wood dowel, or something of that nature. To me it sounded like valve train noise. But my speakers are old and could be fooling me on sound.
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Old 06-15-2014, 12:14 AM   #5
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Could be the audio, but I didn't hear anything out of the ordinary. Nothing obnoxious anyway.
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Old 06-15-2014, 01:14 AM   #6
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Sounds normal to me. The lifters make more noise than most cars and it will make some grinding/tapping noises as the engine stops depending on transmission as mentioned above.

The dripping sound is oil draining back into the oil pan and the creaking is probably just hot parts cooling down and shrinking.
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Old 06-15-2014, 11:08 AM   #7
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Well I appreciate the input. The noise isn't that bad (can't hear it with the hood shut), but my DOHC/SOHC engines only produce the purring/humming noise while the 4.0 sounds rattly/raspy as well. I'll go ahead and consider it normal operating noise until I find out otherwise.

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