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Thread: Why do 2.7 cranks break?

  1. #111
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    Quote Originally Posted by DiscoDB View Post
    From what is known they did redesign the crank and bearings, and changed the oil spec. But they may have potentially also made other changes to the lubrication system and even the crankshaft damper/balancing to mitigate the weaknesses of the 2.7/3.0.

    So most, if not all, of the contributing factors sound like they should have been addressed. Would be good to see the full details on the design changes made. I bet it is a long list.

    Good news is the 3.0 Powerstroke has been confirmed for the new Ranger so we may yet find out more on what Ford did to improve the reliability of the engine. Ford will still need to explain more to address any reliability concerns given the same engine was discontinued for the F-150 after only 3 years.
    Yes they simply made the journals a couple of mm thicker so it is now strong enough so it doesn't break.
    REMLR 243

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  2. #112
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    Quote Originally Posted by Homestar View Post
    The Ford badge screwed to the rocker cover provides superior reinforcement than the Land Rover badgeÖ Why do 2.7 cranks break?
    Why? They're both oval....
    ​JayTee

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  3. #113
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    Quote Originally Posted by 101RRS View Post
    Yes they simply made the journals a couple of mm thicker so it is now strong enough so it doesn't break.
    I keep bashing on about this and maybe Iím wrong but I propose that the crank breaks after the bearings shag out and maybe rotate but only sometimes as many just get the death rattle. I guess 8/10 owners donít pick up on change of note and drive on till it seizes at a bearing and snaps the crank. Or if it happens at 100kph itís pretty instantaneous.

  4. #114
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    Someone said something about inherent weakness in V6 engines....

    Really? How many V6 engines are pulling road trains around this country? I've not heard of any exploding.

    Truckies comments welcome.

  5. #115
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    Quote Originally Posted by ramblingboy42 View Post
    Someone said something about inherent weakness in V6 engines....

    Really? How many V6 engines are pulling road trains around this country? I've not heard of any exploding.

    Truckies comments welcome.
    V6 absolutely can be built tough. But they are just one of the worse for harmonics and balancing which induces flexing of the crank. All of this can be designed out - Ford/PSA just pushed the boundaries too far.

  6. #116
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    Quote Originally Posted by PerthDisco View Post
    I keep bashing on about this and maybe Iím wrong but I propose that the crank breaks after the bearings shag out and maybe rotate but only sometimes as many just get the death rattle. I guess 8/10 owners donít pick up on change of note and drive on till it seizes at a bearing and snaps the crank. Or if it happens at 100kph itís pretty instantaneous.
    Given we canít just change the crank, the spun bearing induced failure is probably the one failure mode that we can be most alert to.

  7. #117
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    No one has brought up the suggestion that the broken cranks are subject to a manufacturing problem/defect such as machining/heat treatment etc which was recognised/remedied and LR is aware of the range of engine Serial numbers which are applicable?

    No doubt there'd be an LR Service News relating to this if in fact it was the problem.
    MY13 TDV6. "e" rear diff, I-Drive throttle controller, otherwise bog standard.

  8. #118
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    Quote Originally Posted by Discodicky View Post

    No doubt there'd be an LR Service News relating to this if in fact it was the problem.
    Maybe not,I can guarantee they know a lot more about the issue than anyone else,apart from the engine manufacturer.

    If itís not a safety issue,and itís going to cost huge $$ to sort,wouldnít they stay quiet ,which is what they have done?
    Paul

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  9. #119
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    Quote Originally Posted by DiscoDB View Post
    When you change the oil and filter it feels like an eternity waiting for the oil pressure light to go out.
    Really?

    Mines out in under a second.
    Cheers
    Tombie

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  10. #120
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    Quote Originally Posted by Tombie View Post
    Really?

    Mines out in under a second.
    For sure itís double the time of a normal start up after an oil and filter change for me but measured in seconds though.

    Through this learning curve Iíve been conscious of how much cranking on startup. With the latest battery I put in itís semi-instantaneous. In the darkest coldest winter morning I maybe sense it cranking before starting.

    I do think for those in colder parts of Vic would be advised to change glow plugs on older cars.

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