RangeRovers.net Forum banner

1 - 9 of 9 Posts

·
Registered
2010-2012 Range Rover MkIII / L322
Joined
·
15 Posts
Discussion Starter #1
I am well aware of the 5.0 SC engine timing chain and guide issues, plus the supercharger coupler that deteriorates but all of the search results point towards the pre-2013 L320 and L322 models, not the 2013+ L405 and L494 models. Did JLR fix these weak points on the newer models or do all 5.0 SC owners have these repairs to look forward to at some point?

From time to time my 2015 5.0 SC with 54k miles makes a knocking noise at idle on warm start-up which sounds to me like the notorious supercharger coupler beginning to fail. The noise goes away after approx 10 seconds or when the engine is revved above 2500rpm. I haven't heard the noise during cold starts.
 

·
Registered
Joined
·
337 Posts
Do a search many threads on this issue, i posted the same noise you're hearing with videos. This issue is alive to this day on all rovers 3.0 sc/5.0 sc. It is not the snout or the guides btw.

Mine has the knocking on warm start for couple years now. Nobody knows what it is. The older models have it too. Jag models have it too. Once i hear it on warm start i just rev it up to make it go away.

Many have replaced the timing chain/snout and the noise is still there.

I've had it for thousands of miles and its always the same. I stopped caring.

I am trying to get the chain/tensioner/guides changed as I hear the rattle upon cold start (totally diff noise than the knocking)
 

·
Registered
Joined
·
258 Posts
I believe the rattle noise upon start-up is from the VVT pistol/actuators (which are very oil pressure sensitive) before they have the optimal amount of pressure pressing up against the guide arms for optimal timing. That is why it goes away after 10 seconds or on RPMs above 2500... Because oil pressure is up and going at correct levels allowing those piston/actuators to manipulate the guide arms against the timing chain for proper timing. It's also why JLR has went to Castrol Pro in 0w20... so the pressure can be up and the oil gets everywhere it needs to quickly upon start up. This came from the Master Mechanic for Range Rover North Atlanta that installed my new JLR V8 Engine btw...
 

·
Registered
Joined
·
258 Posts
Skip to 5:00
that is exactly the spot on the tensioner arms that fails with the older style arms... It's been updated/fixed by JLR since13' I think the Master Mechanic said because I specifically asked about this problem. My engine is an OEM Rover 19' manufactured engine so it has the updated guide arms.... I'd like to know about the supercharger coupler though however!
 

·
Registered
2010-2012 Range Rover MkIII / L322
Joined
·
15 Posts
Discussion Starter #6
I believe the rattle noise upon start-up is from the VVT pistol/actuators (which are very oil pressure sensitive) before they have the optimal amount of pressure pressing up against the guide arms for optimal timing. That is why it goes away after 10 seconds or on RPMs above 2500... Because oil pressure is up and going at correct levels allowing those piston/actuators to manipulate the guide arms against the timing chain for proper timing. It's also why JLR has went to Castrol Pro in 0w20... so the pressure can be up and the oil gets everywhere it needs to quickly upon start up. This came from the Master Mechanic for Range Rover North Atlanta that installed my new JLR V8 Engine btw...
Interesting theory but my rattle/knock is only on warm or hot start, never when the engine is cold. Upon hot restart the oil is thinner than when it is cold, so if the mechanic's theory was right that the engine needs very thin oil to pressurize the VVT actuators the problem would be worse on cold start and less obvious on warm start. Oil pressure comes from resistance to flow so I am planning to experiment with a slightly heavier oil in my engine, probably 0W30, to see if it helps to reduce the noise.
 

·
Registered
Joined
·
2 Posts
Interesting theory but my rattle/knock is only on warm or hot start, never when the engine is cold. Upon hot restart the oil is thinner than when it is cold, so if the mechanic's theory was right that the engine needs very thin oil to pressurize the VVT actuators the problem would be worse on cold start and less obvious on warm start. Oil pressure comes from resistance to flow so I am planning to experiment with a slightly heavier oil in my engine, probably 0W30, to see if it helps to reduce the noise.

I have the same exact issue on my 2012 and I have a similar thought as you that the oil is just too thin when warm and that heavier weight oil would help.

The 0w20 is only for better fuel mileage so I doubt they really focused on the right oil as much as the one to boost MPG ratings as they approached tighter CAFE restrictions with a line up of nothing but thirsty SUVs.

Please LMK your oil change results on the noise!
 

·
Registered
2010-2012 Range Rover MkIII / L322
Joined
·
15 Posts
Discussion Starter #8
No doubt the thin oil is focused on lowering fuel consumption, not extending engine life. That said, most of the engine internals are designed around the low viscosity so deviating too far from the recommended spec is likely unwise. Here is a quote from the LIQUI MOLY JLR press release - I underlined the key comments.

May 2018 – The trend for ever less viscous motor oils as a contribution to lower fuel consumption and emissions can be found in all car markets. The German oil and additive specialist LIQUI MOLY has developed a new oil just for Jaguar and Land Rover: Special Tec LR 0W-20.

Special Tec LR 0W-20 is officially approved by Jaguar Land Rover Ltd. This STJLR 51.5122 approval is required in the latest petrol engines in Jaguars and Land Rovers. "0W-20 is a particularly low viscosity motor oil," says Oliver Kuhn, assistant laboratory manager at LIQUI MOLY. The engineers at Jaguar and Land Rover use this as one of many adjust screws to reduce consumption and minimize emissions. After all, a thin oil can be more easily pumped and has less inside resistance. This means the engine loses less performance. Oliver Kuhn: "The challenge is for such a thin oil to still reliably lubricate the engine even under extreme load."


I did try 5W-30 synthetic in my engine but sadly it didn't have a noticeable effect on the hot start knocking noise so I am back to square one.
 

·
Registered
Joined
·
2 Posts
Hmmm ...thanks for that follow-up. What about a higher grade 0w-20 like Motul Specific that meets the new JLR standard? Have you tried this or heard any reference to it helping here?
 
1 - 9 of 9 Posts
Top