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Thread: 4BD1 Knocking

  1. #11
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    Quote Originally Posted by justinc View Post
    Hi Mike, What year of manufacture was the engine? The pre 1988 N/A engines had non turbo spec pistons, and weren't up to big boost levels and EGT's. I have a 9/1984 build 4bd1 at 300,000km example here that has holed a piston, even running low (12psi) boost pressures and conservative fuelling.

    Lots of pressure from the crank case and misfiring/ rough running. Head off and voila, a hole in number 3 and cracks in 2 of the other piston crowns.

    Hope it isn't the case with yours

    JC
    Way to cause an Isuzu endemic paranoia

  2. #12
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    Quote Originally Posted by justinc View Post
    Hi Mike, What year of manufacture was the engine? The pre 1988 N/A engines had non turbo spec pistons, and weren't up to big boost levels and EGT's. I have a 9/1984 build 4bd1 at 300,000km example here that has holed a piston, even running low (12psi) boost pressures and conservative fuelling.

    Lots of pressure from the crank case and misfiring/ rough running. Head off and voila, a hole in number 3 and cracks in 2 of the other piston crowns.

    Hope it isn't the case with yours

    JC
    AAAAARRRRRGGGG
    Now you tell us.

  3. #13
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    one incident out of all the 4bd1 engines I know of certainly isn't a rush of failures

    next you'll all be condemning all the LT95's because I have had my transfer case apart twice in 2 years.

    Like Ben says there are many of these engines that never have a problem, so don't read too much into it.

    JC
    The Isuzu 110. Solid and as dependable as a rock, coming soon with auto box😊
    The Range Rover L322 4.4.TTDV8 ....probably won't bother with the remap..😈

  4. #14
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    Also keep in mind that IIRC Mikes engine had a full overhaul a while back, in which case all bets are off regarding what pistons etc are actually in it.
    The other thing I recall hearing is that the engines have been known to pick up #3 piston if pushed hard when still cold. Not sure how much evidence there is to support that.

    Steve
    1985 County - Isuzu 4bd1 with HX30W turbo, LT95, 255/85-16 KM2's
    1988 120 with rust and potential
    1999 300tdi 130 single cab - "stock as bro"
    2003 D2a Td5 - the boss's daily drive

  5. #15
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    Quote Originally Posted by justinc View Post
    one incident out of all the 4bd1 engines I know of certainly isn't a rush of failures

    next you'll all be condemning all the LT95's because I have had my transfer case apart twice in 2 years.

    Like Ben says there are many of these engines that never have a problem, so don't read too much into it.

    JC
    You've now planted a seed of doubt, I can see people rushing out to wind in their fuel screws now

  6. #16
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    I'm hoping they will all be selling their engines cheap on eBay

    Steve
    1985 County - Isuzu 4bd1 with HX30W turbo, LT95, 255/85-16 KM2's
    1988 120 with rust and potential
    1999 300tdi 130 single cab - "stock as bro"
    2003 D2a Td5 - the boss's daily drive

  7. #17
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    Knew I should have bought a landcruiser

  8. #18
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    Quote Originally Posted by isuzurover View Post
    My engine is an '87 model with ~200k on the clock post turbo fitment running 21 psi Boost and no IC. Maybe I have been lucky???
    More boost and lower EGT is far better than low boost and high EGT.

    Running 700C sustained, at least you know it's a true measurement. Not like running a 900C tune and using the lag in the gauge to pretend that it's only 700.

  9. #19
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    If you run into to much trouble I'm located at lake Macquarie and would happily come and give you a hand or even a tow with my car trailer (yes I'm isuzu crazy aswell) 0404686632 don't hesitate to call mate

  10. #20
    slug_burner is offline TopicToaster Gold Subscriber
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    Quote Originally Posted by isuzurover View Post
    I think that is going too far. There are heaps of turbo'd 4BD1s running NA pistons without a problem.

    Mine in fact did the whole nullarbor sitting on 700+ EGTs before I turned the boost up and reduced them.
    ok I was a bit harsh, I should have qualified the statement. The weakness that sparked my comment was

    The pre 1988 N/A engines had non turbo spec pistons, and weren't up to big boost levels and EGT's.
    A rebuild also places additional questions on the pedigree.
    Quote Originally Posted by benji View Post
    ........

    Maybe we're expecting too much out of what really is a smallish motor allready pushing 2 tonnes. Just because it's a v8 doesn't mean it's powerfull.

    One answer REV IT BABY REV IT!!!

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