Diff Filler Plug

border · Feb 17, 2019

Hit another problem today. I filled both diffs up with new oil. the rear filler plug does not tighten up, it threads right in but just keeps turning. I've had it on and off over the last few months when refurbing axle and its been fine until today.
Any Ideas ??

mick 1986 · Feb 17, 2019

border said:
Hit another problem today. I filled both diffs up with new oil. the rear filler plug does not tighten up, it threads right in but just keeps turning. I've had it on and off over the last few months when refurbing axle and its been fine until today.
Any Ideas ??

Sounds like it has stripped the threads. Try a few wraps of PTFE tape and see if it helps.

border · Feb 17, 2019

mick 1986 said:
Sounds like it has stripped the threads. Try a few wraps of PTFE tape and see if it helps.

Must remember to get some tomorrow. If threads are stripped can it be fixed?

Wimblowdriver · Feb 17, 2019

Try the front plug in the rear diff. If it tightens up ok, buy a new one for the front.

mick 1986 · Feb 17, 2019

border said:
Must remember to get some tomorrow. If threads are stripped can it be fixed?

Yes it can be fixed, but I would think the easiest way of fixing the problem would be to replace the diff pan. I’m sure you can get new pans for the Salisbury still.

mick 1986 · Feb 17, 2019

border said:
Must remember to get some tomorrow. If threads are stripped can it be fixed?

New cover. Try the front plug first though. It will be cheaper than the cover!

https://www.island-4x4.co.uk/diff-axle-back-plate-britpart-rtc844-p-371.html

Scooby22 · Feb 17, 2019

Looks like it may be just the filler plug has lost its stop so winding on, do as suggested and try the front one in it. Easiest thing to try first.

border · Feb 17, 2019

Will try front one first. Hope it works don't fancy changing the Pan knowing my track record

jamesmartin · Feb 17, 2019

flanged plug and washer or new covers as already suggested

border · Feb 17, 2019

jamesmartin said:
flanged plug and washer or new covers as already suggested

Where will I get Flanged plug from James ?

Al2O3 · Feb 17, 2019

You might have over tightened it and pushed the seat, that the taper sits on, in over.
As said ^^ PTFE, getting thicker towards the outer threads, might be enough for it to tighten.

border · Feb 17, 2019

Al2O3 said:
You might have over tightened it and pushed the seat, that the taper sits on, in over.
As said ^^ PTFE, getting thicker towards the outer threads, might be enough for it to tighten.

Will give that a go tomorrow Mate. Thanks

Al2O3 · Feb 17, 2019

jamesmartin said:
flanged plug and washer or new covers as already suggested

A flange plug is always handy to keep in your pocket

jamesmartin · Feb 17, 2019

border said:
Where will I get Flanged plug from James ?

google 3/4 bsp flanged plug

mick 1986 · Feb 17, 2019

Al2O3 said:
You might have over tightened it and pushed the seat, that the taper sits on, in over.
As said ^^ PTFE, getting thicker towards the outer threads, might be enough for it to tighten.

If that’s the case, will the seat now be loose in the diff housing?

Al2O3 · Feb 17, 2019

border said:
Will give that a go tomorrow Mate. Thanks

Once it’s back on the road I’d check it regularly until your confident it’s not going to vibrate out. I suppose it depends on how tight it feels when you are putting it in too. I was going to suggest a sawn off bolt and washer, but didn’t know what the thread would be. Didn’t know flanged plugs were available. If they’re easy to get, that would be a better bet.

border · Feb 17, 2019

jamesmartin said:
google 3/4 bsp flanged plug

Are these a Temporary fix or will it solve the problem ?? https://www.screwfix.com/p/male-fla...50&gclid=CIrv5-fCw-ACFYWNhQodTMAIsw&gclsrc=ds

Al2O3 · Feb 17, 2019

mick 1986 said:
If that’s the case, will the seat now be loose in the diff housing?

No idea, but what else could have happened. I should imagine it’s just been flared in over.

jamesmartin · Feb 17, 2019

border said:
Are these a Temporary fix or will it solve the problem ?? https://www.screwfix.com/p/male-flanged-plug-x/22863?kpid=22863&ds_kid=92700031524345190&utm_source=bing&utm_medium=cpc&utm_campaign=PX | Shopping | Heating & Plumbing&utm_term=4583520379908380&utm_content=G - Plumbing&ds_rl=1245250&gclid=CIrv5-fCw-ACFYWNhQodTMAIsw&gclsrc=ds

with a fibre washer or similar, presuming your threads are good but just stretched too much for the taper its a common fail

Al2O3 · Feb 17, 2019

jamesmartin said:
with a fibre washer or similar, presuming your threads are good but just stretched too much for the taper its a common fail

Ahh, is the thread on a taper! I thought there was a chamfer on the end of the plug that hit a seat. That makes sense

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