TimC
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 posted on 20/8/07 at 07:09 AM |
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Sierra diff backplate leaking.
Morning all.
I bolted the backplate onto my diff and filled with oil yesterday. I'd read somewhere that you shouldn't use any form of gasket so I just
checked that the surfaces were square and bolted the thing on. Unfortunately I've got a small amount of 'seepage.' It's
going to be a pain to empty and re-do but can anyone offer advice on what to do to make sure that the seal is good 2nd time around?
I've searched but can't find the answer I need.
Thanks in advance.
TC
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speedyxjs
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| posted on 20/8/07 at 07:26 AM |
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When i first rebuilt an engine (1.5hp lawnmower  ) it had no gasket on the sump so i put a small amount of oil round the edges and that worked really
well.
Might work on your diff but it means having to take it out again 
How long can i resist the temptation to drop a V8 in?
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The Great Fandango
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| posted on 20/8/07 at 08:06 AM |
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Most diffs I have owned (already in the kit cars I bought) had had some kind of gasket between the main body and the back casing.
I believe the stuff on mine at present is that sikoflex stuff people use to bond cycle wings on.
He Who Dies With The Most Toys Dies The Happiest
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mookaloid
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| posted on 20/8/07 at 08:30 AM |
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I used a light smear of instant gasket - works a treat
Cheers
Mark
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nick205
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| posted on 20/8/07 at 08:30 AM |
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I'd avoid Sikaflex (or other PU sealants) as they don't fare too well with oil and pterol. I'd either get a sheet of gasket paper
and make one to fit or run a bead of instant gasket around the edge before re-fitting the back plate. There shouldn't be any pressure in side
the diff casing, but the oil will get pretty warm/thin.
Never actually looked before, but the Haynes manual has a distinct lack of info on the diff. It describes replacing the pinion and driveshaft oil
seals and then says any other repairs/overhaul work should be entrusted toa Ford dealer!
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coozer
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| posted on 20/8/07 at 08:32 AM |
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Better idea, don't take it off, why would you want to? Keep it simple.
1972 V8 Jago
1980 Z750
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worX
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| posted on 20/8/07 at 09:46 AM |
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EBAY LINK
Steve
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aerobrick
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| posted on 20/8/07 at 09:48 AM |
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Having refurbed a few diffs now and the Haynes manual is lacking but after working things out the back plates do have a gasket sealant/jointing
compound on them,you may have seen a very light brown film on both surfaces when you took it apart, this needs to be scraped off then wiped clean.
As stated use a good silcone sealant just smear one surface putting the sealant around both sides of the bolt holes bolt up job done.
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