finlay
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| posted on 1/2/08 at 09:25 AM |
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oil fill for ford 3.14 diff
hello all
i m struggling to remove the oil fill plug on my diff, just want to double check that it is actually the oil fill point, the plug with the allen key
in it,
i have tried a moderate heat with a 14" shifter on the end of the allen key with no luck, and was wondering how much heat is it safe to put on
the diff as its only cast,
also
what is the little plastic plug on the top right of the diff, is it a breather of some sort ?
any suggesstions ?
cheers
Finlay
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andyace
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| posted on 1/2/08 at 09:30 AM |
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The top small pipe is a breather, I believe you could fill it from there however it is quite small and could be very tricky.
I filled mine through the side where the drive shafts attach, fortunately mine were off when I had to fill mine.
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bonzoronnie
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 posted on 1/2/08 at 09:39 AM |
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Diff
Yes that is the oil fill plug you have the allen key in. 
Yes the rubber tube at the top is a vent pipe.
Carefull with the heat though. If you give it too much you may soften the alloy & cause some damage uppon removal of the plug.. 
Have you tried giving the head of the plug a few sharp taps with a hammer. This will often shock the bond that is holding the plug so tight. (not too
hard mind)
If you have to resort to heat. Get it fairly hot then quench with cold water, this will also quite often break the bond.
Ronnie
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02GF74
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| posted on 1/2/08 at 09:51 AM |
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that is the filler and oil level plug.
as you know the ideal situation is to be able to remove it and then fill up to the level of the hole.
.... but these can be extremely difficult to get out.
the plug is gonna be way chepaer than a nerw cover palte so I would suggest removing it and drilling out the plug.
use a scriber to scrape between the alloy casing and plug and spray releasing oil. Repeat this a few times.
then try heating the case - it will be quite hard to do with a blow torch as you have a lot of alloy whcih is a very good conductor; then throw cold
water onto the plug only and try to undo.
at some point one of the following will happen
1. the plug comes undone
2. the plug hex socket rounds off
3. the allen key snaps
4. the alloy casing breaks
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finlay
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| posted on 1/2/08 at 09:59 AM |
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cheers Gents
02GF74 -
i like the the little points at the bottom
at some point one of the following will happen
1. the plug comes undone
2. the plug hex socket rounds off
3. the allen key snaps
4. the alloy casing breaks
you need a sense of humour sometimes when car building lol
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Rosco
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| posted on 1/2/08 at 11:57 AM |
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How about scraping the paint off arounf the plug and giving it a liberal spray of WD40, then leave it for a couple fo days. The odd tap with a hammer
will help as well.
I used WD40 when stipping down my doner car. Just sprayed everying and then left it for a week - it came apart without any trouble at all (no broken
bolts, no need for a blow torch, no damage bolt heads). Not bad on a 15yr old car.
I know it's a little different on a alloy casing but it's still worth a try.
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stuart_g
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| posted on 1/2/08 at 12:20 PM |
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my diff oil plug had a torx head so I used an air gun with the appropriate sized torx driver as nothing else would undo it.
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trikerneil
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| posted on 1/2/08 at 01:06 PM |
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If as above...
2. the plug hex socket rounds off
Try welding a bolt into the hole, this gives a new hex to work with and the heat usually loosens things off.
It's worked for me before.
Neil
ACE Cafe - Just say No.
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dan__wright
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| posted on 1/2/08 at 01:32 PM |
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2ft bar on the allen key got mine out, would of used the impact gun but didnt have correct size bit for it.
FREE THE ROADSTER ONE…!!
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Schrodinger
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| posted on 1/2/08 at 01:48 PM |
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Try using Plus Gas I find that better than WD40 for penetrating threads and you can get it in a can so you don't have to spray it.
Keith
Aviemore
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robinj66
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| posted on 1/2/08 at 02:19 PM |
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These things do seem to be a b*st*rd to get out. I ended up fitting a replacement and even that tried to seize up after a couple of days on the
bench.
I found an air impact wrench to be best
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delboy
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| posted on 1/2/08 at 02:51 PM |
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don't worry about the plug, if it or the back plate get damaged when you are removing it simply put a new back plate and plug onto your diff
from another one. The diff you've got is rare, but the back plate from any ratio of sierra diff will fit.
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finlay
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| posted on 3/2/08 at 05:28 PM |
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got it eventually !!!
abit of heat and a 14" wrench on the end of the allen key, managed to rake my knuckles off of the chassis in the process
cheers
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