Patrol TD42 Cyl Compression after 850 000 km





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  1. #1
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    Default Patrol TD42 Cyl Compression after 850 000 km

    It is May - the month in which I replace glow-plugs...


    This time decided to do a compession test sommer while the glow plugs are out


    I was amazed that all cylinders are (from what I can see) still within spec !!
    More importantly, no sigificant delta between adjacent cylinders.


    Any comments from the experts - am I looking at the correct spec?
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    Last edited by Dungbeetle; 2020/05/17 at 10:19 AM.
    2000 Patrol GU 4.2D(onkey) "old-timer" and wise at 848 000 km
    2014 Patrol GU 3.0CRD "teenager" in puberty at 105 000 km
    2007 Echo3 Trailer "the nest" Braked Axle fitted at +50 000 km
    2012 NP300 YD2.5 D/C 2x4 High Rider "platkar" at 120 000 km

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    Default Re: Patrol TD42 Cyl Compression after 850 000 km

    Why do you replace glowplugs in May?
    Do you just check them every May?

    I only replace them when my vehicle become more difficult to start.

    Impressive for the mieage.

  3. #3
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    Default Re: Patrol TD42 Cyl Compression after 850 000 km

    Quote Originally Posted by Mapog View Post
    Why do you replace glowplugs in May?
    Do you just check them every May?
    May = mornings getting cold

    I remove all glow plugs and do a visual plus 12V connection test - if they look OK and get red hot within seconds then I re-use them

    I often find some that have developed a little "pimpel" near the tip - those I chuck away
    2000 Patrol GU 4.2D(onkey) "old-timer" and wise at 848 000 km
    2014 Patrol GU 3.0CRD "teenager" in puberty at 105 000 km
    2007 Echo3 Trailer "the nest" Braked Axle fitted at +50 000 km
    2012 NP300 YD2.5 D/C 2x4 High Rider "platkar" at 120 000 km

  4. #4
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    Default Re: Patrol TD42 Cyl Compression after 850 000 km

    Self deleted, Waarskynlik praat ek nonsens.
    Last edited by jelo; 2020/05/17 at 12:58 PM.
    2012 Jeep Sahara Unlimited 3.6 V6
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  5. #5
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    Default Re: Patrol TD42 Cyl Compression after 850 000 km

    Quote Originally Posted by jelo View Post
    In Ellisras you don't need glow plugs if your compression is decent.

    It almost never goes below zero there. Lowest average minimum is around 6deg C.
    Hoe goed ken jy nissan diesels? Soos in actualy ondervinding met start en ry met hulle?
    Vrywaring: Niks wat ek hier kwyt raak moet hoegenaamd as feite beskou word nie.

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    Default Re: Patrol TD42 Cyl Compression after 850 000 km

    Quote Originally Posted by Reenen View Post
    Hoe goed ken jy nissan diesels? Soos in actualy ondervinding met start en ry met hulle?
    Glad niks nie. Ek het net gedog die TD42 is 'n bietjie soos my TD27 wat omtrent nooit glow plus nodig gehad het hier in Noordwes nie. En dis kouer as Ellisras.

    Sorry, sal niks verder s nie meneer.
    2012 Jeep Sahara Unlimited 3.6 V6
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  7. #7
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    Default Re: Patrol TD42 Cyl Compression after 850 000 km

    Td27/42 start nie sommer sonder glow plugs nie.

    22 grade nou by my.

    Maar glow hom, en start binne eerste swaai.




    https://youtu.be/10Sg9TaiAT4




    https://youtu.be/QKSJ6lUGbvo
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  8. #8
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    Default Re: Patrol TD42 Cyl Compression after 850 000 km

    Ek het so n paar van hulle, en selfs in somer, tensy engine warm geloop is, start hy nie sommer net so met n no-glo nie.

    Maar, tensy jy nie jou glowplugs op n push button het, sal
    Jy dit nie weet nie. Want al start jybdadelik, sonder om te glow, glow hy in daai tyd wat jy besig is om te swaai. Eers as al 4 dood is, of sisteem glad nie glow, besef jy hoe nodig daai engine n glowplug in sy pre combustion chamber het om te start.
    Vrywaring: Niks wat ek hier kwyt raak moet hoegenaamd as feite beskou word nie.

  9. #9
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    Default Re: Patrol TD42 Cyl Compression after 850 000 km

    Quote Originally Posted by Dungbeetle View Post
    It is May - the month in which I replace glow-plugs...


    This time decided to do a compession test sommer while the glow plugs are out


    I was amazed that all cylinders are (from what I can see) still within spec !!
    More importantly, no sigificant delta between adjacent cylinders.


    Any comments from the experts - am I looking at the correct spec?
    30 bar?
    Bietjie hoog. Is daar olie in cylinders gegooi, of brand hy olie?

    Turbo is gewoontlik so rondom 18-21 bar, non turbo tds so 23-26bar.
    Vrywaring: Niks wat ek hier kwyt raak moet hoegenaamd as feite beskou word nie.

  10. #10
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    Default Re: Patrol TD42 Cyl Compression after 850 000 km

    Quote Originally Posted by Reenen View Post
    30 bar?
    Bietjie hoog. Is daar olie in cylinders gegooi, of brand hy olie?

    Turbo is gewoontlik so rondom 18-21 bar, non turbo td’s so 23-26bar.
    Geen olie bygegooi, engin was warm maar nie heeltemal op temperatuur nie (het effens afgekoel tydens my gefroetel)
    Het wel al so bietjie oileverbruik - ongeveer 1 liter per 2000 km

    ...........

    Non turbo - die spec wat ek het verwys na 29.4 Bar teen 200rpm

    Ek het geen idee hoe vinning my starter die engine swaai nie
    Ek het elke keer die starter vir so 10-12 sekondes laat draai

    My hoogste is 30.5 tot 31 Bar
    Last edited by Dungbeetle; 2020/05/17 at 05:58 PM.
    2000 Patrol GU 4.2D(onkey) "old-timer" and wise at 848 000 km
    2014 Patrol GU 3.0CRD "teenager" in puberty at 105 000 km
    2007 Echo3 Trailer "the nest" Braked Axle fitted at +50 000 km
    2012 NP300 YD2.5 D/C 2x4 High Rider "platkar" at 120 000 km

  11. #11
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    Default Re: Patrol TD42 Cyl Compression after 850 000 km

    Quote Originally Posted by Dungbeetle View Post
    It is May - the month in which I replace glow-plugs...


    This time decided to do a compession test sommer while the glow plugs are out


    I was amazed that all cylinders are (from what I can see) still within spec !!
    More importantly, no sigificant delta between adjacent cylinders.


    Any comments from the experts - am I looking at the correct spec?
    Your readings are inline with the manual I have. Remember to do Altitude Correction on the readings you have taken.
    It is not what you buy its what you build.

  12. #12
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    Default Re: Patrol TD42 Cyl Compression after 850 000 km

    Quote Originally Posted by grips View Post
    Your readings are inline with the manual I have. Remember to do Altitude Correction on the readings you have taken.
    If I assume the gauge is correct and have to adjust for 900m above sea level then I need to add about 9% to those values

    Then it means my altitude corrected compression was testing a bit high.....33Bar in stead of 30Bar ??

    Now the comment Reenen made in post #9 about burning oil is starting to concern me

    things to take in account:
    - The engine was not cold but way under normal operating temp when I did the test
    - I do see some white/blue smoke at startup after the vehicle stood for a while (few hours)
    - the vehicle does not noticeably smoke while driving
    - Uses some oil but not much for that type of engine - about 1 liter / 2500 km

    Now - the above high compression makes me start suspecting leaking valve stem seals that left some residual oil in the cylinders, causing higher than actual dry cylinder compression ?
    Last edited by Dungbeetle; 2020/05/18 at 12:41 PM.
    2000 Patrol GU 4.2D(onkey) "old-timer" and wise at 848 000 km
    2014 Patrol GU 3.0CRD "teenager" in puberty at 105 000 km
    2007 Echo3 Trailer "the nest" Braked Axle fitted at +50 000 km
    2012 NP300 YD2.5 D/C 2x4 High Rider "platkar" at 120 000 km

  13. #13
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    Default Re: Patrol TD42 Cyl Compression after 850 000 km

    Al die nissan td non turbos wat ek het, toets 23-26. Ek lees nie die 30 bar specs raak nie. Ek lees seker op verkeerde plek.
    Vrywaring: Niks wat ek hier kwyt raak moet hoegenaamd as feite beskou word nie.

  14. #14
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    Default Re: Patrol TD42 Cyl Compression after 850 000 km

    According to my calculation taking altitude in account your reading were 26.9bar

    Specs from my manual.
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    Last edited by grips; 2020/05/18 at 12:29 PM.
    It is not what you buy its what you build.

  15. #15
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    Default Re: Patrol TD42 Cyl Compression after 850 000 km

    Quote Originally Posted by grips View Post
    According to my calculation taking altitude in account your reading were 26.9bar
    Help us with that calc...
    2000 Patrol GU 4.2D(onkey) "old-timer" and wise at 848 000 km
    2014 Patrol GU 3.0CRD "teenager" in puberty at 105 000 km
    2007 Echo3 Trailer "the nest" Braked Axle fitted at +50 000 km
    2012 NP300 YD2.5 D/C 2x4 High Rider "platkar" at 120 000 km

  16. #16
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    Default Re: Patrol TD42 Cyl Compression after 850 000 km

    Quote Originally Posted by Reenen View Post
    Al die nissan td non turbos wat ek het, toets 23-26. Ek lees nie die 30 bar specs raak nie. Ek lees seker op verkeerde plek.
    Hoe hoog bo seevlak is jou plek....?

    Sien spec :
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    Last edited by Dungbeetle; 2020/05/18 at 12:45 PM.
    2000 Patrol GU 4.2D(onkey) "old-timer" and wise at 848 000 km
    2014 Patrol GU 3.0CRD "teenager" in puberty at 105 000 km
    2007 Echo3 Trailer "the nest" Braked Axle fitted at +50 000 km
    2012 NP300 YD2.5 D/C 2x4 High Rider "platkar" at 120 000 km

  17. #17
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    Default Re: Patrol TD42 Cyl Compression after 850 000 km

    Quote Originally Posted by Dungbeetle View Post
    Help us with that calc...
    Altitude = 3000ft correction factor (psi x .915) = psi
    (426.41 X .915) = 390.165psi = 26.9bar.

    Chart
    Ft above sea level.

    1000′ = .9711
    2000′ = .9428
    3000′ = .9151
    4000′ = .8881
    5000′ = .8617
    6000′ = .8359
    7000′ = .8106
    8000′ = .7860

    Sorry for the formulas being in psi but that comes from many hours spend on Yank v8`s
    Last edited by grips; 2020/05/18 at 12:43 PM.
    It is not what you buy its what you build.

  18. #18
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    Default Re: Patrol TD42 Cyl Compression after 850 000 km

    Quote Originally Posted by grips View Post
    Altitude = 3000ft correction factor (psi x .915) = psi
    (426.41 X .915) = 390.165psi = 26.9bar.

    Chart
    Ft above sea level.

    1000′ = .9711
    2000′ = .9428
    3000′ = .9151
    4000′ = .8881
    5000′ = .8617
    6000′ = .8359
    7000′ = .8106
    8000′ = .7860

    Sorry for the formulas being in psi but that comes from many hours spend on Yank v8`s
    I have it the other way round, meaning at 900m (3000ft) I only have to measure 30x.9151=27.45 Bar on the gauge to be in spec - therefor I am way above spec?

    Who agrees with Grips and who with me ?
    2000 Patrol GU 4.2D(onkey) "old-timer" and wise at 848 000 km
    2014 Patrol GU 3.0CRD "teenager" in puberty at 105 000 km
    2007 Echo3 Trailer "the nest" Braked Axle fitted at +50 000 km
    2012 NP300 YD2.5 D/C 2x4 High Rider "platkar" at 120 000 km

  19. #19
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    Default Re: Patrol TD42 Cyl Compression after 850 000 km

    After some surfing on the web I found a Youtube test that is almost exactly the same values as mine..

    It seems to be a TD42 with a hairdryer fitted after market - not a factory TD42T

    https://www.youtube.com/watch?v=fqeXttFYlh8
    Last edited by Dungbeetle; 2020/05/18 at 01:03 PM.
    2000 Patrol GU 4.2D(onkey) "old-timer" and wise at 848 000 km
    2014 Patrol GU 3.0CRD "teenager" in puberty at 105 000 km
    2007 Echo3 Trailer "the nest" Braked Axle fitted at +50 000 km
    2012 NP300 YD2.5 D/C 2x4 High Rider "platkar" at 120 000 km

  20. #20
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    Default Re: Patrol TD42 Cyl Compression after 850 000 km

    Quote Originally Posted by Dungbeetle View Post
    I have it the other way round, meaning at 900m (3000ft) I only have to measure 30x.9151=27.45 Bar on the gauge to be in spec - therefor I am way above spec?

    Who agrees with Grips and who with me ?
    The internet seems to agree with Grips, although it seems the wrong way around to me too, and I haven't been able to find anything that explains the calculation.
    1996 Patrol 4.2SGL with lots of stuff to make it heavier and thus increase traction?

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