Although I have seen a few manual transmission/rear diff DIY's here I haven't seen one with many pictures. I have just changed out my manual transmission fluid and my clutch fluid on my 2006 G35 6MT. My car just hit 30,000 miles and it was time for a flush. The transmission fluid change was VERY simple, the clutch fluid required the help of my 10 year old son.
Here's what I used for the manual transmission change:
4 quarts of Redline MT-90 75w90 Manual Transmission Fluid ($10 per quart)
2 new MT drain/fill plug crush washers from the Nissan Dealership (they are cheaper than the Infiniti dealership for some reason).
Fluid pump from any auto parts store (mine was .5 qt capacity)
10mm allen head socket
onto the process!
Get everything layed out,
Jack the car up and put on jack stands
get your drop light and 10mm allen socket ready and remove the fill plug first. The fill plug is the upper plug and is located on the passenger side of the transmission. The reason to remove this first is you will be in trouble if you remove the drain plug and the fill plug is siezed for some reason.
Fill plug is actually removed in this pic, it's near the top of the 02 sensor wire. I sprayed both plugs with PB Blaster prior to removal.
Now with the fill plug removed you can remove the drain plug. Place your drain pan underneath and remove the drain plug.
Remove the old crush washers, a small flathead screwdriver sometimes helps. Put new crush washers on.
Put the drain plug back in. Torque specs are in the service manual...I'll update the post later with the correct torque specs
Fill your fluid pump with the new tranny fluid and begin pumping into the fill plug. I had to repeat this process 8 times. Do this until the new fluid starts spilling out of the fill plug.
Put the fill plug back in and torque to spec.
Now onto the clutch fluid. I used a Motive pressure pot to aid in this. However, the cap of the pot kept popping off my clutch fluid reservoir....this is where my 10 year old came in.
WARNING: I think we all should know this by now, but if you don't...
DO NOT GET BRAKE FLUID ON YOUR PAINT!!! it is highly corrosive and will eat through your paint quickly.
Tools needed for this.
8mm socket for clutch bleeder screw, can be a short wall or long wall.
1/4" ID hose or larger, about 10 inches long.
a quart or so of DOT 3 brake fluid.
This is very similar to bleeding the brakes with the Motive bleeder. Simply fill the pot with brake fluid, attach cap to clutch fluid reservoir, pump the pot to 8-10psi, get under the car and loosen the bleeder valve, wait until the new fluid is nice and clear with no bubbles and you are done.
Here's a few pics.
The bleeder valve is on the drivers side of the transmission, just between the catalytic converter brace and the crossmember. It's much easier to see if you remove the rear underbody cover (five 10mm bolts and two clips).
Here's the Motive pressure pot.
Old clutch fluid in reservoir
After bleeding (sorry, no in-process pics of this..it was kind of messy)
That's about it. Pick everything up and take the car for a drive now!