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Thread: P38 4.6 What would you do?

  1. 28th October 2008, 06:36 PM #1
    81stubee
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    P38 4.6 What would you do?

    Need your thoughts. She started using more water than usual last week, so i pulled the heads off on sunday. Its a 97 HSE 4.6

    Heres what I found:
    - Trumpets in plenum chamber loose, could not push it back in, has been loose for a long time, judging by the rub marks on top of the chamber.
    - Carboned up, everything is black, I have only ever pulled down gas engines which are clean, but this appears real dirty.
    - Valley cover was seized on, and had to be prized off, so i guess its never been off.
    - HEad gaskets carboned around firing ring
    - No.4 is washed nice and clean
    - Some of the lifters are slightly concave.
    - Evidence of water on the edge of No.4 Liner

    What should I do?
    - Put back together new gaskets and hope it lasts a bit longer
    - Flanged Liners etc
    - Complete new motor

    Car has done 260000kms and body/interior are perfect.

    Stu
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  2. 28th October 2008, 06:52 PM #2
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    p38arover
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    Stu, to put it back together with just new gaskets would be a waste of time and money.

    At that mileage, it could use a new cam and lifters.

    Check the top of all liners, especially no.4, to see if there has been any movement of the liner, even a poopteenth.

    This is a pic of a bad 3.9 I photographed:



    You could get top-hat liners fitted with your existing pistons.

    Scouse said:
    Quote Originally Posted by Scouse View Post
    For the top hat liners, give Balmain Engineering a call. You might be pleasantly surprised.
    They were cheaper than the two quotes I received (from Davis Performance Landys and Triumph Rover Spares who were almost the same). George130 said he knew of someone in Canberra - see Recommendations Please

    Give me a call if you want to talk about it.

    Ron
    Ron B.
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    2007 Yamaha XJR1300
    Previous: 1983, 1986 RRC; 1995, 1996 P38A; 1995 Disco1; 1984 V8 County 110; Series IIA



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  3. 28th October 2008, 07:42 PM #3
    big guy's Avatar
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    Have the block checked also.
    i had a slipped liner and water escaped through a cracked block.

    Did total rebuild and was great car.

    Sold it to a guy that really wanted it.

    sadly, the problem re-occured. Not sure why though.

    Best of luck.
    do it properly once.
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  4. 28th October 2008, 07:57 PM #4
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    p38arover
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    big guy, had yours been fitted with top hat liners?
    Ron B.
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    2003 L322 Range Rover Vogue 4.4 V8 Auto
    2007 Yamaha XJR1300
    Previous: 1983, 1986 RRC; 1995, 1996 P38A; 1995 Disco1; 1984 V8 County 110; Series IIA



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  5. 28th October 2008, 08:02 PM #5
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    No.
    New short motor.
    just bolted rest of gear back on after clean and polish.
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  6. 28th October 2008, 08:47 PM #6
    PhilipA
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    What should I do?
    - Put back together new gaskets and hope it lasts a bit longer
    - Flanged Liners etc
    - Complete new motor
    I go for 2.
    Regards Philip A
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  7. 28th October 2008, 09:16 PM #7
    Rangier Rover Guest
    You have done well to get this far with a 4.6. They are very prone to shifting liners if ever warmed. As others suggest.... In a 4.6 Top hats.
    A band-aid job will only bite you worse by destroying the engine completely
    Tony
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  8. 28th October 2008, 09:38 PM #8
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    LOVEMYRANGIE
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    Quote Originally Posted by Rangier Rover View Post
    You have done well to get this far with a 4.6. They are very prone to shifting liners if ever warmed. As others suggest.... In a 4.6 Top hats.
    A band-aid job will only bite you worse by destroying the engine completely
    Tony
    As above. Another option is to step the block at the base so the liner sits on top. Have a customer who has had no comebacks when doing this for 2 local LR mechanics here in WA.
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  9. 28th October 2008, 09:45 PM #9
    Rangier Rover Guest
    Quote Originally Posted by LOVEMYRANGIE View Post
    As above. Another option is to step the block at the base so the liner sits on top. Have a customer who has had no comebacks when doing this for 2 local LR mechanics here in WA.
    I've not seen this done with Rover but sounds like it would work. May be cheaper than T sleeves.
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  10. 28th October 2008, 10:12 PM #10
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    LOVEMYRANGIE
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    Think its easier than trying to get the flange faces to meet. If I ask him nicely, he may let me take pics of what he does.
    If I remember correctly, the liners also have a small flange at the top, but are slightly thicker and a bit shorter. It allows for the step to be machined at the bottom.

    Personally, I prefer the flange method as you are not counterboring the whole parent bore which is thin enough already IMHO and the fire ring crushes against the flange providing a seal that does allow gas to cross the liner/deckface contact point, but the above method allows for support at both ends of the liner.
    You see this done a bit in large capacity diesels, but is normally in wet liner engines more so than dry liner.
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