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Arsath



Member Since: 20 May 2015
Location: Sri Lanka
Posts: 133

United Arab Emirates 2010 Defender 110 Puma 2.4 CSW Fuji White
One of the pistons failed need advice
Hi Folks,

One of my pistons failed, my mechanic is recommending to change the oil pump as well while changing the pistons. Is this the recommended practice, there is no issue at all with my current oil pump..

I need a quick answer as there is a parts scarcity where I am and there is only one known oil pump available for the Puma 2.4 .. Embarassed

Thanks
Post #935406 28th Dec 2021 4:06pm
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htb2



Member Since: 02 Nov 2018
Location: Carmarthenshire
Posts: 524

Wales 
Why did piston fail? Leaking injector? From what I hear the engines do not rebuild well.
Post #935409 28th Dec 2021 4:21pm
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geobloke



Member Since: 06 Nov 2012
Location: Nottinghamshire
Posts: 4410

United Kingdom 
Has the mechanic found metal scarf in the oil pump or is he just assuming it needs replacing? Mind you if there is piston metal in the oil where else has it gotten to, worn or blocked up?!
Post #935413 28th Dec 2021 4:44pm
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Co1



Member Since: 19 Aug 2018
Location: North Yorkshire
Posts: 3662

United Kingdom 2013 Defender 90 Puma 2.2 HT Loire Blue
You will need to remove the pump anyway, and if a piston has failed there is a good chance that swarf will have been sucked up into the pump. You might as well buy it and get yours inspected when he takes it out and then either fit the new one or return it based on what he finds.
Post #935432 28th Dec 2021 6:29pm
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Arsath



Member Since: 20 May 2015
Location: Sri Lanka
Posts: 133

United Arab Emirates 2010 Defender 110 Puma 2.4 CSW Fuji White
geobloke wrote:
Has the mechanic found metal scarf in the oil pump or is he just assuming it needs replacing? Mind you if there is piston metal in the oil where else has it gotten to, worn or blocked up?!


He is just assuming that there is a good chance that it can fail. He is saying that if that happens engine can sieze again and will have to go through this again.
Post #935469 29th Dec 2021 1:07am
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Dinnu



Member Since: 24 Dec 2019
Location: Lija
Posts: 3392

Malta 2012 Defender 90 Puma 2.2 CSW Santorini Black
Maybe there is a mixup with the oil pump recall that was on the 2.2?
But as others mentioned, debris from the broken piston could get in the oil pump. The filter should prevent them going further. 1988 90 Hard Top, 19J Diesel Turbo, Shire Blue - Restoration ongoing
2012 90 CSW, 2.2TDCI, Santorini Black
Post #935475 29th Dec 2021 6:38am
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JPE



Member Since: 19 Nov 2018
Location: South West England
Posts: 331

United Kingdom 2013 Defender 110 Puma 2.2 XS CSW Firenze Red
We’re second guessing the mechanic’s reasoning. I’d suggest ask the mechanic why he’s recommending changing the oil pump. It will probably be for the reasons above.
Post #935482 29th Dec 2021 9:09am
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MK



Member Since: 28 Aug 2008
Location: Santiago
Posts: 2400

Chile 2007 Defender 110 Puma 2.4 SW Chawton White
I hope he knows the cylinder needs honing before assembling new piston rings etc. Perhaps new conrod and crankshaft bolts. I would also look at the cooling jets. Puma 110" SW

.............................................................
Earth first. Other planets later
Post #935497 29th Dec 2021 10:51am
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blackwolf



Member Since: 03 Nov 2009
Location: South West England
Posts: 17305

United Kingdom 2007 Defender 110 Puma 2.4 DCPU Stornoway Grey
I'm not entirely sure what "one of my pistons has failed" means but I have to say that I cannot conceive of any situation which required a new piston where I would be happy with anything short of a full strip and rebuild of the engine.

Virtually any sort of piston failure will have resulted in debris loose in the engine, and it will potentially have got everywhere. That means every component of the lubrication system is now compromised (which includes the block, crank, PCJs, turbo, all pipes and galleries, in short anything which has or provides an oil supply). As noted above the bore will need honing, and that will also produce highly abrasive debris.

If it was my vehicle, unless I planned to sell it within minutes of being repaired and wanted a guilty conscience after the sale, I would be looking either for a replacement used engine or a fully-rebuilt complete (not short) engine.

I do however recognise that the OP's location may limit options, and also that that continent is much better that Europe for improvising repairs to an extremely high standard.
Post #935520 29th Dec 2021 1:32pm
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