Hi LandyZone 2.5 NA Team:
I live and work in Morocco and the 2.5 NA is fairly common over here. In the past four years I have rebuilt five of these hunks of iron. All turned out to run very happily with zero problems….even when abused by their owners. You know….run on a Palm oil diesel mix of undefined ratio, mix 1qt of 10 wt hydraulic oil (or what ever you can find that is oil-like) with every gallon of gasoline, and the ever popular mixing of kerosene with diesel (also you just have to “feel” the correct amount to mix correctly). Anyway, solid motors that can take years and tears of abuse. To the story: I rebuilt my personal 2.5 NA and took meticulous care to do it correctly. Dropped it in and after it heated up…it dropped oil pressure till the light came on. Gage showed 50 psi at cold start, 5-ish psi when slightly warm! Pulled the motor, pulled it apart, checked the bearings, rings, torque specs, seals, read every post by James Martin and other Defender motor legends on this forum, reinstalled and the same issue, low oil pressure after about 10-15 minutes of running. Then found the problem after reading an obscure chapter in one of my motor manuals. See the pictures attached but the do-hicky that runs the vacuum pump had two “O” rings on it. (RTC 6167 and RTC 6168). In the event they are worn out (to the point of almost missing like mine) you get low oil pressure after a few minutes. Change those “O” rings when the motor is out every time. It is a pain to do it in situ. Put in the 1£ worth of “O” rings and all will be well…P.S. One motor I rebuilt had 514000 Kilometers on the clock! I did not change those “O” rings and three years later it has another 85000 Kilometers on the clock, no issues. Your results like mine may vary. Not a totally idiot proof motor (as I am the Grad Master of all Idiots). Based on my last pull check and reinstall a few times trouble shooting event…but close, just a good all around designed motor.
I live and work in Morocco and the 2.5 NA is fairly common over here. In the past four years I have rebuilt five of these hunks of iron. All turned out to run very happily with zero problems….even when abused by their owners. You know….run on a Palm oil diesel mix of undefined ratio, mix 1qt of 10 wt hydraulic oil (or what ever you can find that is oil-like) with every gallon of gasoline, and the ever popular mixing of kerosene with diesel (also you just have to “feel” the correct amount to mix correctly). Anyway, solid motors that can take years and tears of abuse. To the story: I rebuilt my personal 2.5 NA and took meticulous care to do it correctly. Dropped it in and after it heated up…it dropped oil pressure till the light came on. Gage showed 50 psi at cold start, 5-ish psi when slightly warm! Pulled the motor, pulled it apart, checked the bearings, rings, torque specs, seals, read every post by James Martin and other Defender motor legends on this forum, reinstalled and the same issue, low oil pressure after about 10-15 minutes of running. Then found the problem after reading an obscure chapter in one of my motor manuals. See the pictures attached but the do-hicky that runs the vacuum pump had two “O” rings on it. (RTC 6167 and RTC 6168). In the event they are worn out (to the point of almost missing like mine) you get low oil pressure after a few minutes. Change those “O” rings when the motor is out every time. It is a pain to do it in situ. Put in the 1£ worth of “O” rings and all will be well…P.S. One motor I rebuilt had 514000 Kilometers on the clock! I did not change those “O” rings and three years later it has another 85000 Kilometers on the clock, no issues. Your results like mine may vary. Not a totally idiot proof motor (as I am the Grad Master of all Idiots). Based on my last pull check and reinstall a few times trouble shooting event…but close, just a good all around designed motor.
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