LR4 5.0 (2012) engine bay rattle when cold

D_Walt · Feb 1, 2023

I recently purchased a 2012 LR4 with the 5.0L v8 on original timing chains with 88k miles. While the engine is noisy, I don’t believe there is any timing chain slap. However, a distinct rattle can be heard from the engine bay when cold. It’s not the failed fan clutch tick, this is much quicker and pronounced. Wondering if it’s not the belt tensioner. Any thoughts? Video below.

D_Walt · Feb 1, 2023

One other note, I’ve checked the timing chain slack through the oil cap with a flathead screwdriver and there is no slack in the chain.

Pfunk951 · Feb 1, 2023

PSU,

Sounded pretty good to me.. I heard a couple of knocks that could have been your phone hitting something, but the valvetrain/injectors/fan clutch sounded ok.. Is it rhythmic with the engine?

MP

ryanjl · Feb 1, 2023

The day I became a happier LR4 owner is the day I came to terms with the fact that this is a noisy engine.

djkaosone · Feb 2, 2023

It sounds normal, I wouldn't worry about it.

D_Walt · Feb 2, 2023

Pfunk951 said:
PSU,

Sounded pretty good to me.. I heard a couple of knocks that could have been your phone hitting something, but the valvetrain/injectors/fan clutch sounded ok.. Is it rhythmic with the engine?

MP

It’s the ticking, it’s very faced paced and seems to be somewhat rhythmic with the engine. I’d say after reaching full temp in completely goes away. Seems just to occur after it idles down on cold start, but then goes away on drive.

djkaosone · Feb 2, 2023

PSU_Rover said:
It’s the ticking, it’s very faced paced and seems to be somewhat rhythmic with the engine. I’d say after reaching full temp in completely goes away. Seems just to occur after it idles down on cold start, but then goes away on drive.

I would check for any loose items for the noise. It's possible that the engine doesn't shake as much after it warms up and the noise goes away. The fan shroud, engine cover, side rubber engine covers, and other plastic items could be the culprit.

D_Walt · Mar 26, 2023

I wanted to follow this up for anyone who is experiencing a similar rattle. It was the Idler Pulley Assembly. The bearing failed and was rattling, having it replaced during the timing job.

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LR4 5.0 (2012) engine bay rattle when cold

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