Low oil pressure 407 2.7 Hdi solved

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407
Donor 2021
Posts: 86
Joined: 20 Apr 2021, 08:55
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Low oil pressure 407 2.7 Hdi solved

Post by 407 »

A few days ago I posted a parts request for a oil sensor for a 407 Hdi 2.7 (which marc kindly moved to the Citroen Parts request thread)

After getting some price sticker shot and postage wait time, I invested in a oil pressure gauge and discovered the oil pressure was indeed low at idle (around 2 psi - if fact, the needle hardly moved) but was around 1.6 bar / 23 psi at 2000 rpm (well within specs) - eg sensor was fine

I then decided to take the oil filter off (cartridge type) and discovered that I had mis fitted the spigot and so the oil cartridge was crushed and the spigot blocked.

Put a new cartridge in first (ensure the spigot was firmly in place), then screwed the plastic cap back on and like magic, we have 1.1 bar / 18 psi at idle.

I also found this video (albeit of a Ford 2.7 Territory with the same 2.7 hdi engine) that makes it look easy (start at 6 mins) -

Some happy snaps
Attachments
oil sensor 1131H8 location
oil sensor 1131H8 location
nice oil pressure at idle
nice oil pressure at idle
fit the filter first and ensure spigot is located in hole
fit the filter first and ensure spigot is located in hole
crushed oil filter the cause of low pressure
crushed oil filter the cause of low pressure
the hole you need to find and fit cartridge spigot intol
the hole you need to find and fit cartridge spigot intol
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GiveMeABreak
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Re: Low oil pressure 407 2.7 Hdi solved

Post by GiveMeABreak »

Glad you found that in time - well done and a potential disaster avoided!
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Huskyxantia
Donor 2021
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Joined: 30 Jul 2018, 22:11
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Re: Low oil pressure 407 2.7 Hdi solved

Post by Huskyxantia »

Great job , no sensor will tell you that , a good old fashioned look and poke around sometimes is the best way , well done.