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adseybear



Member Since: 08 Oct 2009
Location: Vancouver, Canada
Posts: 260

Canada 
Td5 knocking after oil change
Left it with a mechanic, hopefully it’s not terminal.

Changed the oil in my td5 and thought I heard a knock for a few seconds while I was letting it idle before checking level again. Didn’t think much of it, but now 3 times on cold start, it knocks for a few seconds then goes away. Not a light knock, the kind of, a rod is going to shoot out the side any second, kind of knock.

Oil level is good, oil was a good quality 5w40 so doubt there’s an issue there. Confused why it goes away after a few seconds, is there any explanation? I left the full size filter and only changed the centrifugal with an OEM this time. Is there a possibility the oil change has loosened something up and blocked an oil path?

Not sure at this point, just needed somewhere to vent more than anything! 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
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2008 BMW 320D M Sport Estate - SOLD
2001 Defender 90 Td5 Hard Top - SOLD
Post #991892 9th May 2023 1:09am
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Leamreject



Member Since: 19 Dec 2020
Location: Middle Earth - Leamington Spa
Posts: 950

Italy 2011 Defender 90 Puma 2.4 HT Fuji White
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
Post #991893 9th May 2023 2:19am
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adseybear



Member Since: 08 Oct 2009
Location: Vancouver, Canada
Posts: 260

Canada 
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
Post #991894 9th May 2023 2:27am
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4RF RDS



Member Since: 19 Jul 2015
Location: Ottawa
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Canada 2000 Defender 110 Td5 XS CSW Epsom Green
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2000 Defender 110 CSW TD5 (CTX)
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Post #991895 9th May 2023 2:35am
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Nuclear Nick



Member Since: 21 Aug 2021
Location: Southwest
Posts: 243

United Kingdom 
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.
Post #991897 9th May 2023 5:14am
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murph81



Member Since: 11 Sep 2022
Location: Ireland
Posts: 63

Ireland 2007 Defender 110 Td5 PU Belize Green
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.
Post #991953 9th May 2023 1:26pm
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geobloke



Member Since: 06 Nov 2012
Location: Nottinghamshire
Posts: 4348

United Kingdom 
Re: Td5 knocking after oil change
adseybear wrote:
Left it with a mechanic, hopefully it’s not terminal.

Changed the oil in my td5 and thought I heard a knock for a few seconds while I was letting it idle before checking level again. Didn’t think much of it, but now 3 times on cold start, it knocks for a few seconds then goes away. Not a light knock, the kind of, a rod is going to shoot out the side any second, kind of knock.

Oil level is good, oil was a good quality 5w40 so doubt there’s an issue there. Confused why it goes away after a few seconds, is there any explanation? I left the full size filter and only changed the centrifugal with an OEM this time. Is there a possibility the oil change has loosened something up and blocked an oil path?

Not sure at this point, just needed somewhere to vent more than anything!


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?
Post #991971 9th May 2023 3:12pm
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