Coolant Crossover (front) Bleed Plug Cap LEAK

[weezer]

I've run into a bit of a coolant leak coming from the BLEED PLUG CAP on the front cross over coolant tube. This part is relatively new as I serviced the 5.0l earlier this year by doing the timing chain and full coolant system upgrade. The culprit from what it appears is the o-ring and locking mechanism on this cap. I did some hunting and found parts on Amazon that resemble this but I can not confirm that they can replace this part. Any suggestions on how to FIX/REPLACE this plug or am I facing another crossover replacement? If it's a full replacement has anyone come across a aluminum/metal version of LR018275?

Link to Amazon parts search: Coolant Tube Bleed Drain Plug Cap LR011038

 

[Rover Range]

The part # you listed is the correct part from JLR.
DO NOT use any petroleum based lubricants when installing the cap. The o-ring will swell up.

Sadly, aluminum pipes for the normally aspirated engines.

 

[weezer]

I always tend to add a little silicone grease to o-rings do you think this may cause an issue similar to petroleum lubricants?

 

[Rover Range]

Probably. Best to use coolant as a lubricant.

 

[weezer]

@Rover Range - Will do, thank you.