Too much crank end float!!?
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  1. #1
    Official RnS Addict zephyr's Avatar
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    QuestionToo much crank end float!!?

    Today I measured the endfloat on the crank in a Rover V8 I'm building. It's 0.010" which is too much - it's supposed to be 0.004" to 0.008". I positioned a dial guage on the snout of the crank and levered the crank forwards and then backwards. The dial swept out 0.010" from being pushed forwards to being pushed backwards.

    Now what do I do???!?!

    (This on my engine build thread in the Garage section https://www.rodsnsods.co.uk/forum/showthread.php?t=3287 - I'm duplicating it here so it'll get a wider audience)
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    `The normal way to sort it would be to fit a main bearing with slightly thicker thrust faces.

    You will have to see what is available, but +0.005" would bring it in range, if you can get them.

    If you can only get say +0.010 then you can either get a bit taken off the crank, or just thin the FRONT thrust face of the bearing to give the correct clearance.

    Hope this helps.

  4. #3
    I'm Not Jed Clampett stueeee's Avatar
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    You can try to get hold of an oversize thrust main bearing pair for your particular crank's undersize; But these will probablly be stored riight behind the pile of hens teeth at your local motor factor.

    010" of endfloat isn't a huge deal on a Rover motor which doesn't have loose thrusts, I would leave it. But if it really bugs you, you could tin the front of the two thrust faces with soft solder, then scrape them back if you find you have insufficient endfloat. I did this during a rebuild on a vintage Morris motor umpteen years ago because new thrust bearings weren't available.

    HTH
    Last edited by stueeee; 21-12-2009 at 10:54. Reason: punctuation!
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    Official RnS Addict WB54's Avatar
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    unrelated to rovers, but I put a Mini 1071 Cooper S crank into a 1275 block and needed thrust shims made up. I got oversize thrust bearings and had them ground down to size, might be an option ?

    Just remebered a company down in Devon that had a load of NOS bearing, called Thorntons ? They had probably the last set of last grind undersize bearings for a cooper S crank. Might be worth trying them ?
    Last edited by WB54; 21-12-2009 at 13:04.

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    Off the Xmas card list kapri's Avatar
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    0.002" ? I wouldn't lose too much sleep over it but I think you'll struggle to find oversize thrust bearings. Try looking on the TRW site to check if they even exist .

    Try 0.030" odd float ( on a 3.8 oddfire Buick ) had to get another engine as couldn't source a secondhand crank.!!

    Are you sure when you were levering the crank that the block itself didn't move , that sort of movement is easy to miss.

  8. #6
    I'm Not Jed Clampett stueeee's Avatar
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    Quote Originally Posted by WB54 View Post
    unrelated to rovers, but I put a Mini 1071 Cooper S crank into a 1275 block and needed thrust shims made up. I got oversize thrust bearings and had them ground down to size, might be an option ?
    Unfortunately the Rover V8 thrusts are integral to the centre main bearing. This makes getting hold of oversize thrusts potentially more difficult as he'd need the correct undersize of main bearing journal size along with the correct oversize of thrust face. This might be something of a J R Hartley quest.

    As Kev says, 002" extra endfloat isn't a big deal, and even if it gets larger with wear, there isn't any risk of the thrusts falling out like the Mini etc loose half moon style thrusts would.

    If he really can't live with that 002" then tinning bearing face with solder is easy, the bearing material has always got tin and/or lead in it, so getting solder to take is simply a matter of blacking the bits (the journal surface) where you don't want the solder to go.
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    Official RnS Addict WB54's Avatar
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    looks like they have a website now http://www.fwthornton.co.uk/7.html

    worth a try.

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    Got salt Briz's Avatar
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    The other option is to get the crank metal-sprayed & ground back to spec, but for .002" I wouldn't bother.

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    Official RnS Addict zephyr's Avatar
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    Thanks for all the suggestions. I'll make enquiries about parts. Soldering sounds like fun. But to help me make a decision could I just ask what's the downside of too much endfloat? What happens?
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    Rods 'n' Sods Junkie
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    It seems the guys that do more with Rovers than me, think the bearings are 'kin rare.

    I would ask a local engine reconditioner to look through the books to see if there are any available, and also try some of the Land Rover specialists that deal in Military surplus parts. From experience the army are usually supplied with stuff that they will not use in a month of Sundays, as part of their spares packs from the manufacturers, so they have stacks of parts that you would never expect to see.

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