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HairyFool
Member Since: 04 Jan 2023
Location: Essex
Posts: 536
  
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Looking on line at oil pumps I see there are two version subject to VIN, anyone know what was different about the Gen2 pump? A visitor from the dark side, my other vehicle is an MG5 EV
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 8th Jan 2024 8:33 pm |
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Breg90
Member Since: 04 Feb 2017
Location: Falkirk
Posts: 348
 
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The gen 1 oil pump bypass valve (pressure relief) senses the pressure right at the outlet of the pump. Therefore the bypass/relief valve pressure has to be a bit of a compromise when you consider cold viscous oil (high pressure drop across the filter etc) and warm less viscous oil (low filter pressure drop. End result is varying oil gallery pressures at different engine temperatures.
The gen two pump has:
1/. A pressure sensing port (line) from the oil gallery (just above the main bearings) and uses this pressure to control the pump bypass valve, i.e. the main oil gallery pressure is constant - unlike that on Gen 1 pump
2/. It has a separate over pressure relief valve
3/. It has a dump valve that the ECU opens when you are on low load /tick over (I believe from pump & LR manual review). I believe this reduces the load on the engine when idling such that idling fuel consumption is reduced.
Pump rotor size differences:
Gen 1 and Gen have the same size rotor OD
The original rotor on the Gen 1 pumps was 13.5 mm think from memory, the Gen 2 is 15 mm thick, i.e. it pumps a higher volume of oil. However replacement Gen 1 pumps have the 15mm thick rotor and give you the increased oil flow rate.
Can you fit a Gen 2 pump onto a gen 1 block? It will bolt on, but you don't have the oil pressure control port from the main oil gallery. Series one 1949 - in bits, chassis is strapped to the ceiling in my garage (beside the canoe)
LR 90 - In bits
Disco 3 - currently in bits
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| 9th Jan 2024 12:21 am |
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waterbuoy
Member Since: 26 Oct 2013
Location: Argyll
Posts: 2863
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Shortest thread ever? Currently 2009 Disco 3 SE, 2013 MY D4 HSE and 2016 D4 SE
Previously:
TD5 Defender 110 CSW (230k miles)
300TDi Disco 1 (289k)
4 RR Classics (300-350k each, 2 manual, 2 auto)
110 V8 CSW (220k)
S3 109 hi cap pickup (ex RN)
S2A 88 Safari SW with lpg conversion (bloody lethal)
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| 9th Jan 2024 12:57 am |
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