At what mileage should the timing belt be replaced on my LR3. I currently have 104K on it.

I have also seen reference to timing belt and timing chain for this model/year. Which one is it. I have found plenty of belts for sale, but have not seen many timing chains.

Do I need to replace the tensioner at the same time?

Is changing the belt/tensioner a DIY or technician level job?

 

comleader
Your LR3 has the 4,4 V8 engine in it which is essentially the Jaguar AJ series engine that has a chain set --well two chain sets running each cam bank with short loop band chain sets driving the other cam shaft since it is a DOHC engine.
Each chain set has a variable cam timing sprocket and hub and an external sensor which you can observe inserted into the valve covers when the sound proof cover is removed from ther top of the engine.
Hence you have NO TIMING BELTS on this engine.

Accessory belts yes and there are clearly visible if you glance down in front of the engine.

These chains are auto adjustable and need no maintenance. Your concern should be regular oil changes using a good spec oil like Castrol semi synthetic at least.
Keeping engine sludge down is the biggest issue with any variable valve timing systems and the earlier BMW power plants in L322's are /were particularly prone to this problem and its Vanos units.
Thankfully the Jag engine is more durable but not immune to neglect and the other is overheating so never neglect the coolant flush and clean intervals as these problems cause sludging of oil as well due to oxidation of lube oils and condensation mixing.
As for changing chains yes you need special tools to align the engine internals and an LR scanner to clear and do adaptions so good reason enough to look after your LR with service schedule adherence.
Hope that is helpful to you.
T/V

 

Thanks T/V. That clears things up. I am very strict about maintenance and generally change things before required.


At what mileage do the accessory belts need to be changed?

 

From Mitchel/ Snap On Shop Key
Basic advised replacement is at 150,000 mls.
That stated I would be inclined to use the free Gates app on belt wear or obtain from them free a plastic finger depth gauge to check the groove depth.
See:-
Belt Wear Diagnosis| Gates Corporation

With this you simply put the gauge into the groove and if it is above the rib its time to change it.
T/V

 

My both belts developed spiderweb like cracks at 75 000 miles , so it is worth to check them earlier than that, depending on the climate you live in , I guess...Spark plugs were not looking good , at that time , as well.

 

Good point. "Garaged in the Pacific NW" seems to be a pretty good place for an LR3 !

 

When replacing chains, be sure to replace the "cogs" as well. Over time the chains stretch and the cogs teeth adapt to this stretch. Putting a new chain on stretched cog teeth could have you opening up the engine again sooner than you think.