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Thread: Filler tube with breather

  1. 24th February 2013, 03:21 PM #1
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    Filler tube with breather

    My 2.25D has always seemed to have quite high crankcase pressure at higher revs and suffered from oil blowing out through the breather on the rocker cover and a number of other places.

    The oil filler tube has what basically looks like a radiator cap on it; when it's turned down it seals. If I could convert to the (I think earlier) type of filler tube with a breather in the cap, it might help keep the crankcase pressure down.

    So...two questions: Is there likely to be any problem in converting to the breather cap and, if not, has anybody got a filler tube and breather cap which they might be able to spare?


    Cheers,

    John

    P.S. By the way, I am also converting to a 200Tdi aircleaner and will be modifying the breather on the rocker cover to take a much-larger breather tube to run to the aircleaner.
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  2. 28th February 2013, 07:45 PM #2
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    Well, in the complete absence of a cacophony of "No, don't do it!!" replies, I guess I will convert the engine to the breather-type filler tube....
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  3. 1st March 2013, 09:31 AM #3
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    be interesting...
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  4. 1st March 2013, 08:58 PM #4
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    Quote Originally Posted by incisor View Post
    be interesting...
    Yep, well... it'll be interesting to see if the 2.25 spits out less oil as a result...
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  5. 5th March 2013, 10:51 PM #5
    schuy1 Guest
    The "radiator" type oil filler cap is part of the later PCV system Land Rover fitted towards the end of the '70s. It worked in conjunction with a sealed rocker cover breather that was vented into the air intake b4 the carby . I dont recall seeing diesels being fitted with it, only petrols but then the oil burners of that vintage have always been thin on the ground!
    Cheers Scott
    Last edited by schuy1; 5th March 2013 at 10:53 PM. Reason: corrected a sentence
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  6. 6th March 2013, 04:48 PM #6
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    Quote Originally Posted by schuy1 View Post
    The "radiator" type oil filler cap is part of the later PCV system Land Rover fitted towards the end of the '70s. It worked in conjunction with a sealed rocker cover breather that was vented into the air intake b4 the carby . I dont recall seeing diesels being fitted with it, only petrols but then the oil burners of that vintage have always been thin on the ground!
    Cheers Scott
    Thanks Scott,

    That makes sense, as the engine dates, I am pretty sure, from 1978 and I put it in my IIA some time back. It has the sealed rocker cover breather with the tiny wee connection that vents to the air intake. I am keen to convert to the earlier type of filler tube cap and modify the rocker cover breather as it does seem to build up a lot of pressure.

    Cheers,

    John
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  7. 7th March 2013, 05:54 PM #7
    schuy1 Guest
    yes retro fitting is perfectly doable With the sort of pressure that is overcoming intake suction, particularly on a diesel you may have more issues there though. Implementation will tell though.

    Cheers Scott
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  8. 7th March 2013, 07:15 PM #8
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    Quote Originally Posted by Johnno1969 View Post
    Yep, well... it'll be interesting to see if the 2.25 spits out less oil as a result...
    be careful what you wish for.....

    but it should be positive imho
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  9. 7th March 2013, 07:58 PM #9
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    return the oil to the sump

    I would be careful of introducing a situation where the engine could run away, make sure that the oil is returned to the sump and only the sump gas is fed into the air intake.
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  10. 7th March 2013, 08:33 PM #10
    schuy1 Guest
    Quote Originally Posted by wrinklearthur View Post
    I would be careful of introducing a situation where the engine could run away, make sure that the oil is returned to the sump and only the sump gas is fed into the air intake.

    Maybe that is why I have never seen that setup on a S3 L/R Diesel?
    I dont have a diesel manual for a S3 only 2A's but that would be a problem if it did :/. I think john is going to fit the gauze rocker cover breather in conjunction with the gauze filler breather as per an early setup and not vent into the motor at all?

    Cheers Scott
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