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Changing gearbox oil. t25

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Changing gearbox oil. t25

Postby george_s » Fri May 21, 2010 12:40 pm

Have a air cooled 2l t25 and thinking of changing the gearbox oil.
Wouldn’t be surprised if the oil in my machine is the very same as left the assembly line 1982.

First of all, does it make any sense changing the oil?
Wich type of oil should I use,. GL-4?
Is there any useful tips out there that would make the operation easier?

BR
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Re: Changing gearbox oil. t25

Postby schnecke » Fri May 21, 2010 4:13 pm

like you I suspect my oil is from when the van was built and this has been on my list of jobs to do for several years now.

The only advice I can give is ENSURE you can remove the top filler plug before attempting to remove the lower drain plug.
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Re: Changing gearbox oil. t25

Postby williamkay_hotmail_com » Mon Jul 19, 2010 1:58 pm

Hi there,

Sorry to piggyback but could you please confirm that the bottom pic shows the filler plu and the top one shows the drain plug?

Or is the top picture of something entirely different?

Are they the same size socket piece?

thanks, Will

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Re: Changing gearbox oil. t25

Postby jivedubbin » Mon Jul 19, 2010 4:39 pm

been trying to undo mine this morning.. it no wanna shift so i intend to give it squirt of wd40 every couple of days..on mine they are the same size
why is it everything we have one of is down the middle and everything we have two of is down the outside ?Image
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Re: Changing gearbox oil. t25

Postby williamkay_hotmail_com » Tue Jul 20, 2010 9:21 am

thanks jivedubbin, so the things I have circled are the right things then yes?
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Re: Changing gearbox oil. t25

Postby jivedubbin » Wed Jul 21, 2010 10:48 am

yes the only other thing i can see is the reversing light switch . a thought crossed my mind,,..........
could you use the hole where the switch is to fill up with oil its about the same level , i fitted the switch in mine , and a dribble of oil came out when i did it , the blanking plug came out with out a problem.
why is it everything we have one of is down the middle and everything we have two of is down the outside ?Image
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Re: Changing gearbox oil. t25

Postby Fogg » Thu Jul 22, 2010 10:31 pm

jivedubbin wrote:been trying to undo mine this morning.. it no wanna shift so i intend to give it squirt of wd40 every couple of days..on mine they are the same size


JD you'd be better using PlusGas or make your own (machine oil/paraffin) - WD40 is only a moisture repellant
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Re: Changing gearbox oil. t25

Postby john1 » Fri Jul 23, 2010 9:47 am

What oil you using?

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Re: Changing gearbox oil. t25

Postby Fogg » Fri Jul 23, 2010 9:20 pm

Gearbox - no idea, though it should be hypoid SAE80. Level is OK, I checked that when I changed the rev. light switch a bit back.
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Re: Changing gearbox oil. t25

Postby williamkay_hotmail_com » Mon Jul 26, 2010 9:35 am

thanks for replies

I want to do a full oil change which really means doing it twice so get the old oil out and use new oil to flush it properly and then finally top up with new oil again. I have read on here that this is the best thing to do, its prob been 20 years since it was done ;)

However that gets v expensive while spending £7 per litre! Is there a cheaper oil I could use for the flush and then use JK's more expensive for the second fill? Or should I always use the same oil?

thanks
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Re: Changing gearbox oil. t25

Postby williamkay_hotmail_com » Tue Jul 27, 2010 3:04 pm

Anyone got an answer on this one? Same oil? Cheaper oil? Just managed to loosen the 2 plugs, had to take it to a garage and use their ramps to get enough purchase on the nuts with a scaffold pole, damn they were tight.
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Re: Changing gearbox oil. t25

Postby Fogg » Tue Jul 27, 2010 4:52 pm

I personally would just drop the old oil and refill with new - if you feel its necessary then do again next year or so. I have looked and cannot find any reference to manual transmission oil changes so I dont know what the recommended frequency is - I'm sure someone will know if there is one. When you put the plugs back, torque them up to 20Nm (15ft/lbs) then you will get them out again (though they may have got stuck after so long).
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Re: Changing gearbox oil. t25

Postby williamkay_hotmail_com » Tue Jul 27, 2010 10:19 pm

thanks Fogg, Ill do that.

If it helps anyone in future, It seems the amount of oil needed is around 3.5 litres.
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