2010 LR4 5.0 V8 intermittent driver-side ticking — exhaust leak?

[weinerthedog]

I have a 2010 LR4 5.0 NA with about 230,000 km. I’m chasing an intermittent tick that I’m starting to think is exhaust-related, but wanted opinions from people familiar with the AJ133/LR4.

The noise is a fairly even, mechanical-sounding tick from the driver side. It is most noticeable from the driver-side wheel well. I can’t seem to pinpoint it with a stethoscope — it seems to transmit everywhere, from the valve cover bolts to the exhaust and front accessory/bracket area. Passenger side has a faint normal tick, but the driver side is definitely louder.

The odd part is the heat-cycle behaviour:

* On startup or after sitting briefly, the tick can be noticeable.
* After about 5 minutes of running, it fades away or becomes barely audible.
* I can drive the truck for hours with no noticeable noise.
* If I shut it off hot and restart after about 5 minutes, the tick comes back.
* Then after another 5 minutes of running, it fades away again.

Oil filter was clean, oil analysis was good, VVT/cam values look good, and there are no codes. Engine sounds normal once the tick fades. No heavy knock, no obvious chain rattle, and it does not sound like the common timing chain/tensioner clatter videos I’ve heard.

I’m not really thinking cam follower/bucket tappet because I would not expect that type of mechanical tick to disappear after 5 minutes of running, then come back after only a 5-minute hot soak/rest.

Because it is louder in the driver-side wheel well and changes with heat, I’m wondering about a small driver-side exhaust manifold leak, manifold gasket/port leak, cracked manifold, broken/corroded manifold bolt, downpipe/cat flange leak, or heat shield/bracket issue.

Does this heat-soak pattern sound familiar to anyone? Can a small manifold/downpipe leak on these transmit through the engine/brackets enough to sound like a mechanical tick at the front/top of the engine?

Any known common spots to check on the LR4/Range Rover/Jaguar 5.0 driver-side exhaust would be appreciated.

Second video after 5 mins. Will stay that way all day until I shutoff the engine. Noise has been there for a while with no ill effects.

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[powershift]

My 5.0L has that problem too, maybe worse sometimes. It was 100% reproducable before I had the chains done. Now at operating temperature and then park at the store then leave I'll hear it. Give it revs to 2K and it will smooth out in a couple minutes. Not sure *** but I know I'm not paying another dime after getting *****. If it leaves me stranded then that is what it will do. Planning a trip to Colorado mountains right now, not worried about it because flogging it up the grades its fine. Seems like an oiling issue.

 

[weinerthedog]

I can’t see oil pressure or something bleeding down that quick and then coming back right away when Ike oil still thin and hot. Seems like
Thermal expansion as goes away when warm. You said your made a noise when warm? If you listen closely near the end I swear I her a few more ticks once I shutoff the engine. Either way has never caused an issue. It’s. It as bad as it sounds as had the phone jammed up in the wheel well.