7 years 6 months ago - 11 months 4 weeks ago#211by cjj
The gearbox oil should be checked for level occasionally, especially if you have a leak. Otherwise it should be changed every 105,000 miles or 7 years.
I have just filled mine up as I have just fitted a new gearbox and drained it to fit a magnetic drain plug.
The oil I used was Castrol SMX-S.
Filling from empty takes around the 2.4 litre mark, so you will need 3 x 1 litre bottles.
The bottles usually have a filler tube built in. In this case you simply break the seal and pull the centre cap outwards.
The filler hole is also where you check for the level. It is above the drain plug and to the right, looking from the nearside.
You can see them on this pic of my old gearbox with the driveshaft removed.
If you are checking the level, then it should be just below the threaded hole with the filler plug removed.
Unfortunately, in real life, the filler is a pain in the but to get to.
Remove the filler plug from underneath the engine bay (17mm socket). You will need the car up on axle stands or ramps to do this, but the car must be level when checking or filling the oil. If any oil comes out then the level is OK (should only be a slight weep).
I found the easiest way to fill the gearbox was to remove the engine inspection cover and the airbox. I also used a length of tube, one end pushed into the filler
You can also see the drain plug on the above photo, it is the shiny one as it is an aftermarket magnetic plug fitted on mine. If you are changing the oil then you will need to remove this and drain the oil into a suitable container, refitting the plug afterwards.
In standard form the drain plug has a 3/8 square hole into which a 3/8 socket wrench fits perfectly.
The other end of the tube is accessible through the top of the engine bay. Simply fill the gearbox from here.
Now, just keep filling the gearbox until the oil starts flowing out of the filler hole. Remember to put a container underneath to catch the oil otherwise your drive takes a hit.
Once the oil has stopped dribbling out, refit the filler plug and the gearbox is done.
Now refit the airbox and engine cover.
Another method that some people use to fill the gearbox is to use a large hypodermic syringe and a length of tube. This allows you to fill from underneath without taking the engine inspection cover.
Hi i am going to change the gear box oil on my mgf next weekend,i am going to attempt to do it from under the car.I have made a gadget from an old thinners bottle,length of hose,cycle pump,and two old cycle valves.I have tried it with water & it works fine with no effort at all, it pumps to well over a meter high.So it should be fine to reach the filler hole,i know it will be different with the oil & i may have to change the tube to a slightly larger diameter.I am going to try to put some photos on here to show how it looks made up.This is my first time doing this.It would be great to hear what others think, & weather it will work.I will let you know next week when i have tried it out.
Hi i have now changed the gear box oil using the cycle pump.The oil i used was MTF-94.I drained old oil there was only just over 2 LTR so it was low anyway.I wont go into all the details which have been mentioned before.I poured 3ltr of oil into the plastic container put tube into filler hole & pumped it into gear box until oil flowed from filler.It really was that easy,no effort at all, it used nearly all of the 3 ltrs but not quite.Here are a couple of photos.
Rather than fill from the top, or from underneath for that matter, just remove the nearside wheel so that you can get a length of tubing more or less straight to the filler hole. I also fitted a funnel to the hose to facilate pouring from the plastic bottle.