Changes

NG 900/9-3 Changing Manual Transmission

666 bytes added, 10:07, 14 February 2010
Tube of thread lock
1.8ltr of Transmission oil
[[file:Tranny_Change_01.jpg|thumbnail|none|Wood Sill Block]]
==Notes==
Once the two blocks are made you're ready to begin a duel to the death. Set your car where you want to work on it and place the transmission in 4th gear. Go round to the engine and remove the lock plug from the top of the transmission. Using a 4mm Allen or Hex key slip it into the hole what ever you use it must be 4mm and have someway of not slipping through the hole and into the nest of cogs that waits below. As the transmission in now locked slacken of the 13mm pinch bolt on the shifter linkage that is found by the bulkhead behind the transmission.
[[file:Tranny_Change_02.jpg|thumbnail|none|Rear Mount and Linkage]]
Inside the car lift the shifter boot exposing the unknowns of the shifter mount. You will see another hole in the rod and mount move the stick into 3rd gear and remember you don't have a gate the stick is now free pushing the stick forward line up the holes in the mount and rod drop another suitable 4mm item in there and we are ready to go.
Open the bonnet and remove the battery and the intercooler charge carrier pipe. These are not an absolute requirement but if you wish to fight around them so be it. Don't forget to block the pipe end and the throttle body inlet with clean cloth. No need to get anything unwanted into the engine.
[[file:Tranny_Change_03.jpg|thumbnail|none|Ancillary Items]]
Now move to jack up the car. Use a hydraulic jack placed under the hard points of the sub-frame. Go from the door side of the wheels face the jack towards the front of the car and pump away. Lift the car and use stands and the pre-cut blocks under the normal points you would use if changing a wheel. Remove the road wheels in turn so that the car's front is accessible all round.
Once all the above is complete, slacken off the 3 front pipe nuts that secure the pipe to the beloved turbo. Don't remove the nuts, as you will require the pipe to be held secure whilst you remove the rear joint on the pipe and the Lambda sensor. When removing the sensor first undo the torx bolt that holds the sensor wire. This will allow the sensor to be unscrewed from the pipe with out twisting the wire to the point of breakage.
[[file:Tranny_Change_04.jpg|thumbnail|none|Lambda Sensor]]
Move back under the car and split the clamp that holds the pipe to the rest of the system. Do not throw this clamp away I was told by the exhaust dealer that they are expensive and hard to come by. Don't worry about shearing the bolts on the clamp although it is better not to if possible use a blowtorch. Get the clamp to an exhaust dealer and ask them to refurbish it. They should clean it up and rethread the bolt holes and give you a couple of shiny new bolts. If they charge you for it then that would be harsh.
[[file:Tranny_Change_05.jpg|thumbnail|none|Intermediate Joint]]
Finally remove the cat support rubber this is located behind the engine you will see it no problem.
[[file:Tranny_Change_06.jpg|thumbnail|none|Catalytic Converter Rubber Support]]
Now find the lower transmission cover plate and remove it. The plate is held in place via 2 12mm bolts.
[[file:Tranny_Change_07.jpg|thumbnail|none|Lower Transmission Cover]]
==Part 2 - Removal of the Sub-frame==
The engine must now be braced. Remove the rubber grommet from the transmission end-lifting eye. Set-up your support beam and put in place. With my draper beam I did not need the chain I set the lifting hook directly in the eye on the engine. Only tighten the lifting thread don't let it take the weight of the engine yet.
[[file:Tranny_Change_08.jpg|thumbnail|none|Engine Support Beam Hook]][[file:Tranny_Change_09.jpg|thumbnail|none|Engine Support Beam]]
Place a hydraulic jack, with a plank of wood, under the sump. Pump the jack and, as you see the engine start to move, wind up the lifting hook. The brace now has the engine under tension. Remove the jack.
[[file:Tranny_Change_10.jpg|thumbnail|none|Engine Left]]
The sub-frame is very cumbersome. Using a 16mm socket, a breaker bar, and a blow-torch if things are seized, loosen the front 2 bolts on the frame
[[file:Tranny_Change_11.jpg|thumbnail|none|Subframe Diagram]]
Work back and do the same, using a standard 18mm socket for the mid pair and 16mm for the rear pair.
'''Note: If the hub nuts are off you can tap the driveshaft in a little, using a soft faced hammer, to allow access to the nut with a ring spanner. Alternatively use a 18mm open ended spanner. Tapping in the driveshaft also allows you to remove this nut. It is recommended that this nut and the hub nut be replaced as they are of the self locking type and should not be re-used.'''
[[file:Tranny_Change_12.jpg|thumbnail|none|Lower Ball Joint]]
With the jacks holding the frame in place and the engine braced securely. Begin to remove the frame bolts and nuts. Start at the front and work back. As you remove the rear mount bolts the engine may pivot backwards don't be alarmed, this is a great moment, the engine is now held in position by the brace you are half way there. Release a little pressure of the jacks on a slight drop and split the ball joints. Remove the nuts. Lower the frame. As the frame comes away drag it off the jacks and pull it from under the car.
[[file:Tranny_Change_13.jpg|thumbnail|none|Sub Frame]]
Examine the rear bolt mounts you are looking for 2 large spacer washers. These may be stuck to the under side of the car. Do not lose these washers. If they are stuck to the car wind in the bolts a little so that they stay where that are. I wound all my bolts and nuts back on to their corresponding points so that nothing of the wrong length went into the wrong hole!
[[file:Tranny_Change_14.jpg|thumbnail|none|Spacer Washers]][[file:Tranny_Change_15.gif|thumbnail|none|Bolt and Spacer Washers]]
Take a break and return to the job after a well-earned cup of tea. All looks very different now and you will see the job to remove the transmission is really nothing more than a handful of bolts!
I did this job alone. If you have a mate with you who can watch all of this and check the shifter linkage doesn't get tangled with any other parts as it comes down. Then this would be a good idea as the linkage is quite fragile compared to the rest of the transmission.
[[file:Tranny_Change_16.jpg|thumbnail|none|Transmission Front Mount]][[file:Tranny_Change_02.jpg|thumbnail|none|Rear Mount and Linkage]]
At the end of this stage you need to have off the two major components, the sub frame and the front pipe.
[[file:Tranny_Change_17.jpg|thumbnail|none|Subframe and Downpipe]]
Looking under the car you should see this.
[[file:Tranny_Change_18.jpg|thumbnail|none|Everything Removed]]
Now the fun begins. Remove the transmission side drive shaft hub nut and remove the outboard end from the hub. This will be easy as the lower ball joints are out of the way. Supporting the shaft on a hydraulic jack.
[[file:Tranny_Change_19.jpg|thumbnail|none|Driveshaft Supported by Jack]]
Let's return to our engine support beam. Using the winder, release the hook and begin to drop the engine don't worry as, due to the large hydraulic mount on the far side of the engine you have a superb pivot point. You really can wind the engine and transmission right down. The transmission may give the impression that it will simply slide off and hit the floor it will not believe me. Wind down the whole power unit until the drive shaft is Horizontal with the floor. You can see how low the transmission is by this view through the wheel arch
[[file:Tranny_Change_20.jpg|thumbnail|none|Transmission Lowered]]
and comparing the next picture to the earlier one.
[[file:Tranny_Change_21.jpg|thumbnail|none|Engine Lowered]]
Now you can remove the drive shaft if you like. I Used a broad bladed steel chisel, the sort used for splitting bricks, and moving to the inboard end of the shaft placed the blade between the inner casing and the transmission and cracked the chisel on its shaft in a levering motion so that you pop the inner circlip. I removed my shaft after getting the whole lot out in this manner but its up to you.
Move around to the other wheel well and lay with your legs either side of the engine. Place your feet on the transmission casing where ever you can. The final drive point is good. Grab the car but not the axle stand, although it is temptingly in reach, and push with your feet. Slide the whole unit off the remaining drive shaft and the input shaft and it should just settle onto the jack.
[[file:Tranny_Change_22.jpg|thumbnail|none|Transmission on Hydraulic Jack]]
Remove the jacks from the unit and pull the whole transmission from under the car
[[file:Tranny_Change_23.jpg|thumbnail|none|Transmission Out of Car]]
So now you've got your transmission out what then?
Firstly if you're not fitting a new pressure plate or friction plate do not go messing with the centralisation of the plates. The plates are centred so save yourself hassle and leave well alone.
[[file:Tranny_Change_24.jpg|thumbnail|none|Pressure Plate]]
Well, my box came out because I blew reverse gear andit was easier to fit a new box than remove and repair the existing one. The most obvious reason for removing the transmission is to fit a new clutch. I took this opportunity and did fit a new three-piece kit. You may just be fitting a new release bearing or a new input shaft seal. Whatever the problem you have to do all this anyway.
As I said earlier I did this job alone, if you can you will need a mate now more than ever. You will need two hydraulic jacks or if your lucky you will own a transmission jack. You need to move the transmission under the car in a relative position.
[[file:Tranny_Change_25.jpg|thumbnail|none|Transmission Ready to Go Back In]]
Then if your car was only lifted as high as an extended pair of Axle stands like my 900 was you will need to lift, push and lift the transmission onto 1 jack and then a second that will support the bell housing. Set the jacks on their lowest point place the bell housing on a jack head and get it balanced then move a second jack which is close at hand and, using your hands, lift the bell housing end onto the second jack. Get them balanced and take a breather and look at what you have to do.
When you are happy with the way it is lined up. Work the transmission onto the drive shaft, if this starts to go into position you are home. Visually check from all angles that you are happy with the position of the transmission and push it home as the input shaft reaches your friction plate it will pick up the teeth on the plate an then enter the flywheel. This should happen very smoothly due to the new grease on the shaft. Around the bolt holes on the bell housing there are dowels that align the housing with the engine block, these should all line up as you push the housing home.
[[file:Tranny_Change_26.jpg|thumbnail|none|Positioning Transmission]][[file:Tranny_Change_27.jpg|thumbnail|none|Transmission in Position]]
Place all the bolts into their corresponding holes and start to wind them in when all are in position tighten them in a diagonal sequence. This will place even fitting pressure on the housing to engine join.
'''Note: The ball joint bellow kits are actually available as a spare. Part No. 8993867'''
[[file:Tranny_Change_28.jpg|thumbnail|none|Ball Joint]]
Move the sub frame into position under the car and bring in the ever-present 2 jacks. Pull the frame onto the jacks and balance it. What you are looking for is to align the lower ball joints if these go into place then the frame is loosely aligned.
[[file:Tranny_Change_29.jpg|thumbnail|none|Subframe In Place]]
As you begin the lift align the frame by pushing and pulling and fit the ball joints into the hub as you continue to pump the jacks each side separately. Do not drive the frame tight against the chassis, as you have to refit the spacer washers to the radius arm mount, which is the third and final bolt pair.
[[file:Tranny_Change_30.jpg|thumbnail|none|Rear Transmission Mount]]
As the ball joint comes through the hub spin on the nut. Don't do what I did bolt it up and then realise that you have to use a breaker bar to force the lower arms down so you can wind on a nut! Once the ball joints are in place refit the rear bolts that hold the spacer washers.
[[file:Tranny_Change_31.jpg|thumbnail|none|Transmission Spacer Washer]]
Move to the next mount point, which are the 18mm bolts. Then it is the 18mm nuts that bolt onto the rear engine mount. There is a steel cable that is fixed to the rear mount
[[file:Tranny_Change_32.jpg|thumbnail|none|Transmission Rear Mount]]
make sure that this is in the correct position if all is ok and you are happy with the position wind on the nuts but again not tight. Finally fit the front 16mm bolts and line up the frame with your score marks when ok tighten the front and work back the engine and transmission are now in place. Don't forget the ball joints! Take a look over our work if you are happy remove your engine support beam and your transmission is fitted.