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        General >> Problems >> Humming noise
        
(Message started by: Paulus on Jun 5^th, 2006, 7:26am)

Title: Humming noise
Post by Paulus on Jun 5^th, 2006, 7:26am

I have developed a humming from my rear end :o

When I get to about 30mph, I can hear it clearly, the faster I go, the louder and high pitch the hum goes.

Does this sound like a wheel bearing? I doesn't get any louder/quieter on the bends.

If it does turn out to be a wheel bearing, how dificult are they to change. Is it best left to a garage to sort? I am handy with a spanner, but haven't got much spare time.

Title: Re: Humming noise
Post by martin_rowe on Jun 5^th, 2006, 8:29am

Sounds like wheel bearing.

Title: Re: Humming noise
Post by Baw_Flinger on Jun 5^th, 2006, 8:52am

Could be the bearings but it could be they need tightning up rather than they are on their way out. Mine used to do the same running up to 50mph until I got them done. 10 min job.

Title: Re: Humming noise
Post by Kjelle on Jun 5^th, 2006, 9:17am

Check the oil level in the transmission, I had the same sound. The oilseal where the propshaft goes in did leak
oil so the oil level was to low!

Title: Re: Humming noise
Post by jonnycab on Jun 5^th, 2006, 9:43am

It could be be the diff

Title: Re: Humming noise
Post by Kjelle on Jun 5^th, 2006, 11:37am

Yes the diff is maybe low of oil!

Title: Re: Humming noise
Post by Paulus on Jun 5^th, 2006, 12:35pm

What type of oil does the diff use and how do you check the level?

Title: Re: Humming noise
Post by Kjelle on Jun 5^th, 2006, 3:48pm

Hypoidoil SAE 80-90 I think, Take the oilfillplugs out and look if the oils drain out, If not ,Fill to the oil comes out from the hole! Hope you understand what I meant.

Title: Re: Humming noise
Post by Octavian_P on Jun 5^th, 2006, 4:23pm

If i remember corectly the differential uses SAE 90W oil, and the gearbox uses 75W-90.

I think my scorpio is also producing that hummming noise but at speed over 75 mph and when accelerating a bit harder in 5-th gear :-/

Title: Re: Humming noise
Post by jonnycab on Jun 6^th, 2006, 11:01am

If their is no evidence of oil leaking from the diff.. i.e. oil sprayed on chassis & suspension, then the oil level is probably ok.
If this is the case then it is more likely the diff is on the way out. That's if it is the diff that is humming.

Title: Re: Humming noise
Post by Paulus on Jun 6^th, 2006, 12:26pm

I'm going to try to jack up the back end tonign to give the rear wheels a wiggle to see if there is any play.

If it does turn out to be a wheel bearing, how difficult is a DIY replacement?

Title: Re: Humming noise
Post by jonnycab on Jun 6^th, 2006, 12:49pm

Not too hard, but reasonably time consuming as the bearings fit very tightly over the hub.
The way I got them off & the new ones on was to put the hub (with old bearings on) & the new bearings in the freezer over night. The next day the old ones came off with a bit of tapping & the new ones tapped on quite easily. Be sure to try & do it as quick as you can otherwise the hub will warm up again & then it will nigh on impossible to get the new bearings on without a bearing press.
Also be sure to use a new locking hub nut & do it up as tight as possible..i.e..using a breaker bar with a scaffold pole on it!! ;)
Look here....http://www.fordscorpio.co.uk/rhubs.htm

Title: Re: Humming noise
Post by Paulus on Jun 7^th, 2006, 8:03am

It looks like it's the diff. :'(
I jacked up the back end last night and both wheels are secure - no play whatsoever.

Is it better to drain the diff before re-filling, or should I just top it up. Bear in mind that it has got over 150K on the clock. that means that, potentially, the oil is that old.

Title: Re: Humming noise
Post by Octavian_P on Jun 7^th, 2006, 8:14am

It wouldn't cost a fortune to try first changeing the oil to the diferential. A 10 year old oil with 150 k mile i don't think it's got the right lubrication properties.

Title: Re: Humming noise
Post by Paulus on Jun 7^th, 2006, 6:10pm

There's more...
Whenever I put my foot on or off the gas, I hear a clunk from the rear end. Would this be some kind of cush drive that has worn out? Could this be related to the hum?

Title: Re: Humming noise
Post by jonnycab on Jun 8^th, 2006, 11:27am

The clunk does sound diff related..i.e..worn splines. Or it could just be that the prop shaft bolts have worked loose, I know that there was a Ford recall concerning these bolts.

Title: Re: Humming noise
Post by Paulus on Jun 8^th, 2006, 11:32am

hmmmm. What's wrong with the bolts? Too short? wrong material?

Title: Re: Humming noise
Post by jonnycab on Jun 8^th, 2006, 11:48am

Not sure what the problem was, just rememeber a recall about them.
Best thing to do is check them for tightness anyway, at least it won't cost anything. :)