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| Leamreject Member Since: 19 Dec 2020 Location: Middle Earth - Leamington Spa Posts: 970   
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If it’s literally started at the point of oil change, it could be that the new oil is to thin and you need a higher viscosity?
From my experience older engines can be quieter with thicker oil, which can also be better in warmer environments. Ride like you stole it!! If I’m not on a bike it’s because only a 4x4 will do… 2011 2.4 Puma 90 HT |
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9th May 2023 2:19am |
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| adseybear Member Since: 08 Oct 2009 Location: Vancouver, Canada Posts: 260 
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I went from a 5w30 to a 5w40, so actually slightly thicker but shouldn’t make a difference as the same viscosity when cold. If it knocks when cold but not when hot, it must be an oil flow issue as an oil when warm would be thinnest. 2003 Defender 90 Td5 CSW Belize Green - "Betty"
1958 Series IIA 109 Station Wagon - "Randolph" - Awaiting Restoration 2019 Jeep Wrangler JL Rubicon - SOLD 2006 Volvo V70 D5 - Ocean Race Edition, SOLD 2003 VW Passat Estate 1.9TDI - SOLD 2008 BMW 320D M Sport Estate - SOLD 2001 Defender 90 Td5 Hard Top - SOLD |
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9th May 2023 2:27am |
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| 4RF RDS Member Since: 19 Jul 2015 Location: Ottawa Posts: 942 
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And codes? 2010 Range Rover MkIII Autobiography Super Charged (Idris)
2003 Range Rover Mk III (Desmond FitzWilliam) 2000 Defender 110 CSW TD5 (CTX) 1992 Range Rover Classic (Lizzy) 1972 Series III 300 Tdi (Stanwood) 1967 MGB GT Every normal man must be tempted at times to spit on his hands, hoist the black flag, and begin to slit throats. H. L. Mencken (1880 - 1956) |
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9th May 2023 2:35am |
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| Nuclear Nick Member Since: 21 Aug 2021 Location: Southwest Posts: 284 
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I had this once with a Saab. I had changed to a different make of filter (cheaper!) and it turned out that it was draining back into the sump when the engine was switched off. As a result the engine knocked for a couple of seconds on starting while the filter filled and oil pressure built up. Changed back to original filter make and problem fixed.
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9th May 2023 5:14am |
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| murph81 Member Since: 11 Sep 2022 Location: Ireland Posts: 63  
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I bought my current Defender TD5 15P with the engine knocking, I was convinced it was a top end ratttle but it was the bottom end knocking.
It was a one owner vehicle with 51k miles and full service history. The previous owner had just got it serviced by and indy LR specialist and it started knocking leaving the garage. The oil was like mercury, I ended up putting a used Disco 15P engine in, I have the old engine on a stand now just waiting to get a chance to strip the bottom end to assess the damage. I spoke to a guy in local engine/machine shop and he said injector trouble was the usual cause of bottom end failure. Hopefully this is not the case with your own. |
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9th May 2023 1:26pm |
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| geobloke Member Since: 06 Nov 2012 Location: Nottinghamshire Posts: 4410
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What is your oil pressure like? It is not uncommon for the pressure relief valve to jam in the open position and not allowing any oil pressure to be created. This can lead to a lack of oil pressure at both the timing chain tensioner and lash adjusters in the head. Creating a louder than normal engine knock and rattle. A few seconds of noisier than normal engine noise is possible after an oil change, but it should clear after oil pressure is created. The 5w-40 should if anything increase the oil pressure a little as long as the relief valve is operating properly. Do not take this the wrong way, but when you did the oil change did you do anything else to the engine, replace any other parts? |
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9th May 2023 3:12pm |
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