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Valve Seat Recession and LPG - myth or not?

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  • Valve Seat Recession and LPG - myth or not?

    G'day Everyone,

    I was wondering if anyone has ever had trouble with valve seat recession on a 4.0 V6?

    If so were you on LPG?

    The reason I ask is I have been having trouble with O2 sensors in my right bank so I took my car to an Auto Diagnosis specialist who told me that "This is the worst possible engine to put on LPG, they give trouble on petrol and on LPG this will be an ongoing issue". I am struggling to believe this to be honest and keen to hear if other people have had troubles.

    For reference my car has a JTG liquid system on it and has done about 110,000kms with it. 30,000 or so have been fairly hard kms towing 2.5 tonnes.

    Cheers

    Stewart
    2007 120 Series GXL V6 Manual Black
    JTG Liquid LPG, Pacmaker Extractors, Redarc Dual battery system, 120W Solar Panel, Rino HD roof rack, Iron Man Awnings and Roof Top Tent, External LED Lighting, Longeranger 22L Water Tank, Black Widow half barrier, more to come...

  • #2
    Ive put 120,000 on LPG on my FJ with no issues, and know some that have done more.

    Hilux has the same engine as the P120 - Prins Autogas has a Hilux with ~ 500,000 kms on it on LPG.

    https://www.facebook.com/search/top/...ia%20Pty%20Ltd

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    • #3
      Thanks Mate, I compression and leak down tested my car on Saturday. Lowest compression test was 167psi most were 177-183psi and one was 189psi. The leak down test was fine also. I call BS on my car having dead valves.
      2007 120 Series GXL V6 Manual Black
      JTG Liquid LPG, Pacmaker Extractors, Redarc Dual battery system, 120W Solar Panel, Rino HD roof rack, Iron Man Awnings and Roof Top Tent, External LED Lighting, Longeranger 22L Water Tank, Black Widow half barrier, more to come...

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      • #4
        how many kays total?

        fairly big variance in compression.. variance is not a good sign

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        • #5
          Have your tappets adjusted.They use a bucket and shim adjustment. Important on gas vehicles.

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          • #6
            Not sure if this is relevant, but i am doing the timing chain on my 1GR-FE and it has done 266k and not been serviced well at all. It is straight petrol but I was surprised that when i checked the valve clearances they were all within spec. I am sure LPG would take it's toll on guides and valves, but they must be pretty hardy to be still within spec after 266K.

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