Hot Diff after 35km drive

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Hot Diff after 35km drive

Post by Hoeha on Wed Aug 27, 2014 7:41 am

Hi All, i present to you, my first issue.

I have made my first (slightly) longer trip yesterday (35 + 35km in a pickup porter 1.3 2007) and i noticed the rear axle or diff makes a lot more noise when i've driven furher than, say, 20km. The diff cover gets pretty hot too. The noise it makes sounds like dry bearings, or even dry rack and pinion. The outside of the axle and diff is completely clean and dry. So either it has been dry for a long time, or there is oil, and the problem lies somewhere else. Wheel bearing maybe.

Now i am going to see if i can get my hands on some thick oil today at work. (industrial gearbox oil)
Reason for the thicker oil is that i hope to reduce the inner tyre spinning a little.
Do any of you know how much oil i need? And what is the standard recommended oil viscosity?
O and what is the allen key size for the plug in the diff cover? I forgot to measure it this morning and i need to borrow one at work, as my set only goes up to 10mm...

Thanks in advance for the helps!

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Re: Hot Diff after 35km drive

Post by HighlyJetted on Wed Aug 27, 2014 8:22 am

Oil isn't going to change the wheel spin.

But I would prioritise seeing if there is oil in there at all.
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Re: Hot Diff after 35km drive

Post by Timosaki on Wed Aug 27, 2014 10:48 am

Of course, but when i open it up, i might as wel change the oil right? I just need to know beforehand how much...

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Re: Hot Diff after 35km drive

Post by Timosaki on Wed Aug 27, 2014 10:49 am

O, and the allen key size, does antone know which i need?

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Re: Hot Diff after 35km drive

Post by Hoeha on Wed Aug 27, 2014 7:26 pm

Okay, there is oil and it looks okay.
Aaand i know what makes the noise... Gearbox. Sounds dry and rattle-ish...
I'm uploading a video now.

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Re: Hot Diff after 35km drive

Post by Hoeha on Wed Aug 27, 2014 7:27 pm


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Re: Hot Diff after 35km drive

Post by Hoeha on Wed Aug 27, 2014 7:28 pm

Is the oil level plug on the right hand side of the gearbox? Small Allen screw?

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Re: Hot Diff after 35km drive

Post by HighlyJetted on Thu Aug 28, 2014 12:01 am

I bet your propshaft is shafted Wink

Unbolt it and feel the UJ's

It's a really common fault on hijets
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Re: Hot Diff after 35km drive

Post by Timosaki on Thu Aug 28, 2014 6:30 am

Forgive me for being a newbe, but what are uj's.
I couldn't feel any play on the shaft, but that might be because it was parked in gear.
I will check it out! I hope it is the shaft and not the gearbox...

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Re: Hot Diff after 35km drive

Post by Hoeha on Thu Aug 28, 2014 7:52 am

I've been looking in the workshop manual, but can't seem to find the procedure to remove the drive shaft. Does the front just slide out of the gearbox after i unbolt the rear of the shaft?

Thanks a lot HJ, for putting up with my rain of questions...

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Re: Hot Diff after 35km drive

Post by HighlyJetted on Thu Aug 28, 2014 8:05 am

Timosaki wrote:Forgive me for being a newbe, but what are uj's.
I couldn't feel any play on the shaft, but that might be because it was parked in gear.
I will check it out! I hope it is the shaft and not the gearbox...

They don't get play, they go tight/stiff.

Hoeha wrote:I've been looking in the workshop manual, but can't seem to find the procedure to remove the drive shaft. Does the front just slide out of the gearbox after i unbolt the rear of the shaft?

Thanks a lot HJ, for putting up with my rain of questions...

Yes 4 x nut/bolts - think they are 14mm.

Pull shaft out of gearbox, then stuff a cloth into the gearbox to stop oil dripping.
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Re: Hot Diff after 35km drive

Post by Timosaki on Thu Aug 28, 2014 11:21 am

Cool, thanks! It'll have to wait till the weekend, but i will let you know the findings.

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Re: Hot Diff after 35km drive

Post by Timosaki on Sun Aug 31, 2014 11:02 am

Okay, so unfortunately the prop shaft is fine...
Guess the gear box is all thats left...

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Re: Hot Diff after 35km drive

Post by harrythehamster on Tue Oct 20, 2015 8:17 pm

Timosaki wrote:O, and the allen key size, does antone know which i need?

Hex socket/allen wrench size for rear diff oil cap - anyone know the answer to this one looks like 12 or 14mm?
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Re: Hot Diff after 35km drive

Post by harrythehamster on Thu Oct 22, 2015 9:16 pm

Okay so 12mm too large, 10mm sort of fits but just spins round - I don't (yet) have an 11mm to try but can't say I think it would fit - the cap is corroded and looks like its never been off yet -  seems to be rounded. Surely someone has had a rear diff filler cap off a 1.3 S85?
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Re: Hot Diff after 35km drive

Post by harrythehamster on Sat Nov 14, 2015 3:15 pm

So I got an 11mm hex bit, it wasn't a snug fit as expected but did have some purchase on the wrench. I couldn't budge it. Got breaker bar out and rounded the diff cap nicely, almost a perfect circle now. I guess the diff oil is not getting changed anytime soon.
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