This tutorial is also available in French
➔
Automatic gearbox selector rod oil seal change on Austin Mini
Vehicle ➔ Mini 1000 am1991 automatic gearbox
Difficulty ➔ Easy
Time ➔ 2 hours
Summary
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Along with the differential oil seals, the gearbox linkage oil seal is one of the main sources of oil leaks.
Spring washers are locking washers that prevent the nut or screw from loosening. It is not recommended to reuse spring washers as they can lose their effectiveness. As much as possible, always fit new spring washers.
Unfortunately, you will not see any tightening torques in this tutorial. Despite our extensive research, we have not found any manuals specifying the tightening torques for the automatic gearbox linkage bolts and nuts. Be careful because most of the bolts are screwed into aluminum housings. Tighten them moderately.
Required Tools
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DAM9317
Oil seal retaining clip
Packaging :
•
The above parts are sold individually.
• DAM9317: The retaining clip is no longer available anywhere. So you have no choice: you must recover the clip mounted on your Mini.
• DAM9317: The retaining clip is no longer available anywhere. So you have no choice: you must recover the clip mounted on your Mini.
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Drain the engine and gearbox
Op 01
Drain the engine and gearbox (➔ see the tutorial ''Draining the engine + the automatic gearbox'' Op 02 to 04).
Disassemble the linkage
Op 02
Identify where the automatic gearbox linkage cover is located.
Op 03
Unscrew the 2 linkage cover fixing bolts. Use a 1/2'' combination spanner.
Op 04
Remove the linkage cover. Pull by hand.
Op 05
Remove the fixing bolt of the control lever on the selector shaft sleeve. Use a 7/16'' combination spanner
Op 06
Remove the pivot bolt of the control lever. Use a 7/16'' combination spanner
Op 07
Rotate and move the control lever away from the work area. Use a piece of string.
Recover the spacer located above the control lever (1st photo).
Op 08
Immobilize the selector shaft in rotation. Insert a small piece of wood between the sleeve and the gearbox housing (2nd photo).
Op 09
Remove the sleeve fixing nut on the selector shaft. Use a 7/16'' or 11 mm socket spanner.
Op 10
Remove the sleeve from the selector shaft. Pull by hand or lever with a 10 mm combination spanner.
Surprisingly, this sleeve is very difficult to remove from the shaft.
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Remove the oil seal
Op 11
Identify where the linkage oil seal is located. Use a small mirror.
Op 12
Push the gearbox selector shaft back to free up the work space. Push by hand.
Removing the selector shaft will make our task easier when drilling the old seal and when installing the new one.
Op 13
Drill the oil seal. Use the Ø2 mm drill bit and the drill.
Be sure to position the tip of the drill bit correctly and check the angle of the drill. Be careful not to machine the selector shaft, the aluminum housing, or the retaining clip.
Op 14
Screw a 3 mm wood screw into the linkage oil seal. Use a screwdriver.
Op 15
Remove the oil seal and its locking washer. Use needle-nose pliers.
Install the new oil seal
Op 16
Thoroughly clean the oil seal housing.
Op 17
Lubricate the lip of the new oil seal (13H6585) with engine oil.
Op 18
Engage the new oil seal on the selector shaft. Push by hand.
Be careful not to damage the lip of the oil seal when passing the thread and the shoulder, otherwise all your efforts to stop the oil leaks will be reduced to nothing.
Op 19
Engage the oil seal in its housing:
•
Fit a 13 mm socket against the oil seal.
•
Tap on the socket with a mallet.
No need to hit hard, the seal goes in very easily.
The new oil seal seems to protrude very slightly from its housing (3rd photo). It must be thicker than the original oil seal. Unfortunately, now that it is in place, it is no longer possible to compare them.
Op 20
Fit the oil seal retaining clip (DAM9317) at the entrance to its housing.
This retaining clip is no longer available anywhere. So you have to recover it.
Op 21
Engage the retaining clip in its housing:
•
Fit a 16 mm socket against the clip.
•
Tap on the socket with a mallet.
No need to hit hard, the clip goes in very easily.
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Reassemble the linkage
Op 22
Replace the sleeve on the selector shaft:
•
Engage the sleeve on the shaft. Push by hand.
•
Screw the nut (GFK3211) with its new spring washer (GFK1124) onto the end of the selector shaft.
Screw the nut on without tightening it for now. We will tighten it when the sleeve is aligned with the control lever.
Op 23
Replace the control lever on its pivot bolt :
•
Engage the pivot bolt (BH504131) with its new spring washer (GFK1124) in the control lever.
•
Engage the spacer on the pivot bolt.
•
Screw and tighten the pivot bolt into the gearbox housing. Use the 7/16'' combination spanner.
Op 24
Move the selector shaft to align the sleeve with the control lever. Pull by hand or use a screwdriver.
Op 25
Connect the control lever to the selector shaft sleeve:
•
Engage the bolt (GFK5180) with its new washer (GFK1124) in the control lever.
•
Screw and tighten the bolt into the sleeve. Use the 7/16'' combination spanner.
Op 26
Tighten the sleeve nut. Use a 7/16'' or 11 mm socket spanner.
Op 27
Replace the linkage cover:
•
Prepare the 2 cover fixing bolts (SH505091) with their spring washers (2K2545) and their flat washers (GFK1114).
•
Fit the cover.
•
Screw and tighten the 2 cover fixing bolts. Use a 1/2'' combination spanner.
The spring washer should be against the bolt head and the flat washer against the cover.
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Put oil back in the engine and gearbox
Op 28
Put oil back in the engine and gearbox (➔ see the tutorial ''Draining the engine + the automatic gearbox'' Op 16 to 21).
Check the correct operation of the automatic gearbox selector
Op 29
Take a road test to check that the automatic gearbox selector is working properly.
As we have not touched the gear selector adjustment, it should work perfectly again.
The End
