j_davis
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 posted on 12/3/06 at 11:14 PM |
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Diff oil colour
While checking the level in my diff (7" Ford LSD 3.62) I found quite a few filings on the filler plug and the oil seemed quite dark.
I have now drained the oil (sucked out via the filler hole) and refilled, but the old oil was quite black.
The diff was supposedly fully reconditioned and it's done 4000 miles since.
Should I seriously be considering opening it up to have a look or am I being paranoid (it's not that noisy, just whines a bit on a trailing
throttle)?
James.
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RazMan
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| posted on 12/3/06 at 11:19 PM |
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Someone once said that gearbox & diff oil is like 'the blood of Satan'  coz it really is horrible stuff - black & gooey and
the smell of it hangs around for weeks.
If your diff is not making any strange whiney noises (most probably demons) it is probably quite normal but worth changing to be on the safe side.
[Edited on 12-3-06 by RazMan]
Cheers,
Raz
When thinking outside the box doesn't work any more, it's time to build a new box
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indykid
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| posted on 13/3/06 at 09:51 AM |
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removed misleading info.
my old gearbox oil was definitely trying to be red though.
sorry all, i stand corrected
cheers
tom
[Edited on 13/3/06 by indykid]
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NS Dev
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| posted on 13/3/06 at 10:26 AM |
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Extreme Pressure (EP) gear oil as used in spiral bevel gearsets like the sierra diff is normally a dark golden colour when new, but will go black very
quickly, this is normal.
It does stink too, like rotten eggs.
I wouldn't worry too much, just use it and see what happens, they all tend to whine a bit on the overrun, recon ones usually more so as the
setup procedure is rarely as good as ford achieved.
[Edited on 13/3/06 by NS Dev]
Retro RWD is the way forward...........automotive fabrication, car restoration, sheetmetal work, engine conversion
retro car restoration and tuning
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oliwb
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| posted on 13/3/06 at 10:33 AM |
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As a series 3 landy owner I feel quite qualified when I say that yes most things above are true you want either EP90 or hypoid there's a
difference in the last numbers tho between 40 and 50 (50 iirc dissolves bronze bushes) and 40 does not....40 is hard to get hold of but most
Agricultural supplies sell it for tractors etc. Do NOT use the red oil it is not an additive it is in fact the oil meant for automatic transmissions!
It will bugger up your gearbox and diff but will seem better for a while....Its an old 2nd hand car sales man trick to disguise the synchromesh that
doesn't work properly! Oli.
If your not living life on the edge you're taking up too much room!
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MikeR
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| posted on 13/3/06 at 01:21 PM |
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not just second hand car salesmen. I beleive it was a standard trick in old BL dealerships when people complained about the cold gearchange in one of
the cars. They knew it would last longer than the warrenty and made the change better.
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j_davis
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| posted on 13/3/06 at 05:36 PM |
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Cheers for the replies. I originally put in Castrol EP80W-90, which was goldy yellow, but I didn't know it changed colour after use (I
understand engine oil going black due to the carbon deposits).
Refilled with Ford's EP90, so I'll see how it goes
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