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Thread: Level Ground - Oil Checks.

  1. #1
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    Level Ground - Oil Checks.

    When we read the manuals they all say that fluid levels 'should be checked with the vehicle standing on level ground', which is really common sense.

    That maybe in a perfect world where we have concrete slab garages but 100% level ground is not always guaranteed. Also if you have to check it roadside you cannot always be on level ground. My garage does not have a slab and when I place a digital spirit level on the running boards it measures a forward slope of 2.6 degrees which for me is level enough to change gearbox oils etc. I wonder where the cut-off is when it comes to the degree of slope?

  2. #2
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    You could work it out...
    basic rule is called a 1 in 60, meaning that a 1 degree offset will have a 1 unit offset over a 60 unit distance.

    By example: at a guess the oil sump is about 300mm long in the meat of it (300tdi) and I think the dipstick is near the front. Let's say it is just for a giggle. So your floor is 2.6 degrees off level, so this would equate to a 2.6mm height difference over a length of 60mm. The actual length we are interested in is only 150mm, at worst, because the fluid level will still be correct in the middle. So that's 60 x 2.5 equals 150, therefore 2.6mm x 2.5 equals... 6.5mm up or down your dipstick depending on which way the nose is pointed. The dipstick is a lot closer to the middle so the error is even smaller.

    A gearbox, well, my gearbox, is filled from the side near the middle, so as long as it's not on a side slope... diffs are filled from front/back, but a diff is only very short too. Similar to above, you are looking at a few mm difference. It's not going to matter that much. I give you the numbers and how I arrive there just by way of explanation. I happen to like working stuff like that out, oddly enough.

    Short version is, put oil in, drive it, oil leaks out, don't stress about a few degrees on your driveway.

    Rod

  3. #3
    Eevo's Avatar
    Eevo is offline OldBushie Gold Subscriber
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    told you the earth was flat
    Quote Originally Posted by DazzaTD5 View Post
    Its a land Rover Defender... you need a real mechanic

  4. #4
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    My shed has a slopping dirt floor, if I fill engine oil to full mark there, then take it to flat ground and check again, good 1/4 overfull Level Ground - Oil Checks.
    '93 D1 V8 auto
    '93 D1 200Tdi 2-door, ARB's, MD transfer, sill tanks, winch, 2"lift.......
    '95 D1 V8 auto......gone
    '86 V8 RRC.....gone

  5. #5
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    You could work it out...
    basic rule is called a 1 in 60, meaning that a 1 degree offset will have a 1 unit offset over a 60 unit distance.
    You been flying aeroplanes, mate?

  6. #6
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    Side slope is usually more of an issue - many (most?) engines have the dipstick at the side. For example, the Isuzu has the dipstick on the LH side, and it is nearly vertical. The 2.25 also has the stick on the LH side, but it is on a slight slope where it is in the sump.

    This can be a serious error when pulled up at the side of a road.
    John

    JDNSW
    1986 110 County 3.9 diesel
    1970 2a 109 2.25 petrol

  7. #7
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    Quote Originally Posted by Old Farang View Post
    You been flying aeroplanes, mate?
    Just a little...

    Never actually used that rule for navigation. Lots of other stuff though

  8. #8
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    Quote Originally Posted by BigBlackDog View Post
    Just a little...

    Never actually used that rule for navigation. Lots of other stuff though
    I have. Commonplace for solo pilots with no electronic navigation assistance.
    John

    JDNSW
    1986 110 County 3.9 diesel
    1970 2a 109 2.25 petrol

  9. #9
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    The trick is not to get off course in the first place.

  10. #10
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    Eevo is offline OldBushie Gold Subscriber
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    Quote Originally Posted by BigBlackDog View Post
    The trick is not to get off course in the first place.
    tower: what was your last known positition
    lost pilot: on the runway...
    Quote Originally Posted by DazzaTD5 View Post
    Its a land Rover Defender... you need a real mechanic

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