Mazda 3 manual transmission disassembly
Disassemble in the order shown in Figure 1.
Procedures for removing individual crankcase components are shown below
![](/images/stories/maz/tra/kor7.jpg)
![](/images/stories/maz/tra/kor1.jpg)
Remove the input shaft seal using a screwdriver (fig. 1).
![](/images/stories/maz/tra/kor8.jpg)
Remove the mainshaft bearing race and bell together (fig. 2).
![](/images/stories/maz/tra/kor9.jpg)
To disassemble the roll pin, align the clutch housing pin removal slot with the roll pin position.
Knock out the pin using a beard with a thin sting (fig. 3).
![](/images/stories/maz/tra/kor10.jpg)
To remove the control stem, move it in the direction of the arrow shown in Figure 4.
![](/images/stories/maz/tra/kor11.jpg)
Using a flat-blade screwdriver and a hammer, make a hole in the cover (fig. 5).
![](/images/stories/maz/tra/kor12.jpg)
Remove the sealing cap by inserting a flathead screwdriver into the hole on the inside of the crankcase (fig. 6).
![](/images/stories/maz/tra/kor13.jpg)
Remove the control stem seal using a screwdriver (fig. 7).
![](/images/stories/maz/tra/kor14.jpg)
Remove the differential seal using a screwdriver (fig. 8).
![](/images/stories/maz/tra/kor15.jpg)
Before disassembling the differential bearing race, remove the outer race of the bearing using a special tool (fig. 9).
![](/images/stories/maz/tra/kor2.jpg)
To remove the reverse lever shaft, first use pliers to remove the roll pin (fig. 10).
![](/images/stories/maz/tra/kor3.jpg)
Protect the reverse lever shaft with a rag and use the same pliers to remove the shaft (fig. 11)
![](/images/stories/maz/tra/kor4.jpg)
Using a special tool, remove the main gear housing bearing race (Fig. 12)
Checking input shaft elements
![](/images/stories/maz/tra/kor5.jpg)
Measure the gap between the 3rd and 2nd gears (fig. 13).
If the gap exceeds the maximum, check the contact surfaces of the 2nd and 3rd gears, the 3rd/4th gear synchronizer clutch.
Replace worn or damaged parts. Gap: 0.05–0.20 mm. Maximum: 0.25 mm.
![](/images/stories/maz/tra/kor6.jpg)
Measure the clearance between the 4th gear and the bearing (fig. 14).
If the clearance is greater than the maximum, check the contact surfaces of the 4th gear, bearing and 3/4th synchromesh clutch.
Replace worn or damaged parts. Gap: 0.17–0.37 mm. Maximum: 0.42 mm.