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Thread: engine replacement

  1. #1
    Join Date
    Jan 2012
    South East Michigan

    Default engine replacement

    I have a 04 Discovery that came from the factory with secondary air. The only replacement engine I can find that comes with a warranty is without secondary air. So here's my question. Will it fit in my vehicle? I'm guessing that my cat might eventually get plugged,, Does anybody know if I would run into any other problems?

  2. #2
    Join Date
    Oct 2011
    Mountains of Western Pennsy.


    I'd check over on DiscoWeb, since these are their specialty. I have never seen or worked on a Secondary Air engine, so I'm not sure of the differences. But, if I were changing out an engine, I'd go for a 4.6L instead of a 4.0L. I would think that if the whole engine is changed out that wouldn't cause a problem, as the secondary air system would be eliminated in its entirety. Same cats on either engine, (as near as I can find) so that shouldn't be a problem.

    '99 Disco II
    '95 R.R.C. Lwb (Gone...)
    '76 Series III Hybrid 109
    '70 Rover 3500S

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