XF 3.0D Timing Belt
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  1. #1
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    XF 3.0D Timing Belt

    I bought my beloved XF (2011 3.0 Diesel) 6 years ago, at 12 months old with 12,000 miles on the clock. It is now 7 years old, with almost 90,000 miles (hasn't been used much for the past 3 years). I intend to keep it for a few more years yet, so being a responsible owner, I just had a new timing belt fitted at the local dealership (£625 "deal" from Jaguar). Jag recommend replacing it at 7 years or 112,000 miles.

    I'm convinced the (3-litre V6 diesel) engine sounds a little bit smoother now (always felt good, still does), but that must be placebo effect, surely? Replacing the timing belt is just avoiding a problem in the future, isn't it?

    I've never had a new timing belt fitted before, not sure what to expect. All the pistons and cylinders are the same 7-year-old kit, so I must be imagining it?

    Please tell me if I'm wrong
    '61 XF 3.0D Luxury, Ultimate Black, Charcoal Leather

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  3. #2
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    In 1979 I bought a new Rover SD 1 and after a few weeks I noticed that the engine was noisy, not accepted by Hartwells of Abingdon at the outset. I continued to complain and fortunately on the last occasion a technical adviser from Rover was on the premises. He was asked to give his view. After a few minutes he took the Service Manager in to an office and I could see that they were looking through a file of technical bulletins. After a few more minutes I was told by the Service Manager that they were going to replace the belt. Afterwards the car was beautifully smooth and silent, that wasn’t my imagination

  4. #3
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    Quote Originally Posted by steveparker View Post

    I'm convinced the (3-litre V6 diesel) engine sounds a little bit smoother now (always felt good, still does), but that must be placebo effect, surely? Replacing the timing belt is just avoiding a problem in the future, isn't it?
    Worn timing belts or (more likely) the tensioner can cause rough running and/or suboptimal valve lift timing. So, you may very well be noticing something real.




    P.S. I have no idea why Jaguar/LR/PSA use timing belts on their V6 diesels, vs using the much better/more durable/more reliable timing chains as they use them on the 3.0V6 Petrol. Prob because those derived from the AJV8 petrol, I guess.
    Hailing from: New England, USA
    Jaguar XF Ownership History: 2009 XF-SC(SV8), 2010 XFR, 2012 V8 Portfolio
    Looking For: Good Handling/Light Jaguar Sports Car and Off-Road Capable Land Rover

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  6. #4
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    Quote Originally Posted by Baron95 View Post
    Worn timing belts or (more likely) the tensioner can cause rough running and/or suboptimal valve lift timing. So, you may very well be noticing something real.

    P.S. I have no idea why Jaguar/LR/PSA use timing belts on their V6 diesels, vs using the much better/more durable/more reliable timing chains as they use them on the 3.0V6 Petrol. Prob because those derived from the AJV8 petrol, I guess.
    I did a search on the net. The short version is:

    Timing belts are lighter and run smoother - resulting in better fuel economy and less noise. Also a lot cheaper to make. Only disadvantage is that they're less durable and need to be changed more frequently than timing chains. The process of changing timing belts or chains is time consuming and laborious.
    There is also a longer version:

    Timing Belt - Advantages

    • Precision registration and timing with no loss of high torque carrying capability
    • Minimal vibration and chordal effect
    • Positive slip proof engagement
    • Wide speed range, especially important when the entire speed range is developed from a single source
    • Virtually no elongation (stretching) due to wear
    • High mechanical efficiency, as much as 98% when properly maintained. By contrast, chain drives are in the 91-98% efficiency range, while V-Belts average in the 93-98% range.
    • Power transmission efficiency is not lost with use
    • Clean operation, no need for lubrication
    • Reduced noise
    • Long, dependable trouble-free service
    • Excellent abrasion resistance
    • Rust resistant
    • Resists chemicals and contaminants
    • Increased drive design options
    • Weight savings
    • Safety issues
    • Economical operations:
      • No need for expensive drive enclosures
      • No need for lubrication systems
      • No need for tensioning devices
      • No adjustment needed due to stretch or wear
      • No cost for lubricant or disposal fees
      • No worn sprocket replacement
      • No ongoing maintenance costs for roller chain
      • Energy savings
      • Reduced costs associated with "downtime" on top of lost productivity

    Timing Belt - Disadvantages

    Our own experience has shown that the timing belt is not perfect in every situation when comparing it against a chain drive. Being able to recognize timing belt limitations helps us to educate our customers in making the right decisions on their particular applications needs.

    • Availability of numerous chain sizes allows for the use of smaller pitch diameters and/or number of teeth while achieving the desired ratio
    • Higher speeds and power capacities
    • Detachable chain links make installation easier in some instances
    • Need for accurate initial alignment of drive components
    • No slippage
    • Higher drive ratios at shorter center distances
    • Lower bearing loads
    • Less affected by temperature or humidity
    • Less affected by oil and grease
    Kind regards
    Henrik Münster, Denmark
    MY2009 XF Premium Luxury 4.2 V8 petrol, lunar gray, dove leather.
    Previous: MY2012 XF Luxury 2.2 (190 ps) diesel, azurite blue, barley leather.

  7. #5
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    My timing belt will be changed at my cars next service. It's being done on the 10 year anniversary at jaguars recommendation, not 7. Car is 2009 model.
    2009 3.0d preimum luxury

  8. #6
    Senior Member
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    Nov 2016
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    Quote Originally Posted by pekem View Post
    In 1979 I bought a new Rover SD 1 and after a few weeks I noticed that the engine was noisy, not accepted by Hartwells of Abingdon at the outset. I continued to complain and fortunately on the last occasion a technical adviser from Rover was on the premises. He was asked to give his view. After a few minutes he took the Service Manager in to an office and I could see that they were looking through a file of technical bulletins. After a few more minutes I was told by the Service Manager that they were going to replace the belt. Afterwards the car was beautifully smooth and silent, that wasn’t my imagination
    Similar tale, I had the first SD1 V8 sold in Worcestershire 1976 that was fine but when I part ex'd it in 1978 the new one had a rattle. I had to get very assertive with the dealer to sort it however Rover did replace the belt and it was fine after that
    64 Plate RSport 3.0D All Black, Ceramic coated, self healing front car wrap, 19" alloys

  9. #7
    Junior Member
    Join Date
    May 2014
    Posts
    5
    I’ve just had the cambelt changed on my 2009 3.0 v6 diesel along with and service and a number of other fixes. After about 60 miles the auxiliary drive belt failed and the water pump collapsed, not a great Friday night! The jaguar dealer initially said they didn’t touch anything in the area, but then said they did remove the auxiliary belt, the RAC recovery people suggested over tightening the belt could have broken the pump pulley. Jaguar then said that they usually replace the water pump at the same time at the cambelt, but this was never mentioned to me.

    Has anyone that has used the 3+ servicing offer of a cambelt replacement for £625 had the water pump changed at the same time? Was is recommended or even included in the £625? It seems very strange that if that part is normally changed at the same time that they would do it without... Any advice or experiences would be useful thanks.

  10. #8
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    Quote Originally Posted by DCSH100 View Post
    I’ve just had the cambelt changed on my 2009 3.0 v6 diesel along with and service and a number of other fixes. After about 60 miles the auxiliary drive belt failed and the water pump collapsed, not a great Friday night! The jaguar dealer initially said they didn’t touch anything in the area, but then said they did remove the auxiliary belt, the RAC recovery people suggested over tightening the belt could have broken the pump pulley. Jaguar then said that they usually replace the water pump at the same time at the cambelt, but this was never mentioned to me.

    Has anyone that has used the 3+ servicing offer of a cambelt replacement for £625 had the water pump changed at the same time? Was is recommended or even included in the £625? It seems very strange that if that part is normally changed at the same time that they would do it without... Any advice or experiences would be useful thanks.
    When I took my car to Jaguar (Stratford Tottenham, serves the Mayfair customers) I asked them to change any other belts in the area. Which they did, and charged extra £40 or so. I used the fixed price servicing. No mention of changing the water pump. However, their service was shocking. I had to go make 4 trips in total to get the service I'd originally asked for. I would suggest finding a local Jaguar specialist. In fact, I'd be happier taking my car to the local kwik fit rather than jaguar again.
    2009 3.0d preimum luxury

 

 

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