The dreaded electric seat switch

Having recently added a 1993 Vogue SE to my collection, I started to sort out the usual LUCAS mess, beginning with the driver’s seat adjustments (passenger side was OK). Typically, the controls moved the mirrors but not the seat and trying to get a 6’3″ body into the space occupied by the last owner was a challenge – though not as big a challenge as fixing the problem.

Step 1 – remove two screws from the metal cover over the motors and run a jumper wire from the battery direct to the seat motor- just reverse the polarity to change the direction of movement. Now at least the leg room and rake make driving feasible.

Step 2. Undo the NEGATIVE connector on the main battery – this is not essential but it may help you not to fry anything you touch inadvertently.

GENTLY pry off the two levers, then the top plate from the switch box on the side of the seat. If it has one, remove the rubber gasket. Undo the two Philips head screws securing the switch pack to the housing. GENTLY prise out the pack and unplug it from the loom.

Take the pack to a CLEAN area and place it onto a towel or other surface where the contents will not be lost for ever, Turn over the unit and remove the single Philips head screw from the underside. Then take Valium or strong drink to fortify yourself against the inevitable moment when most of the ball bearings and springs decide to remove themselves from their dedicated location.  GENTLY prise off the cover – Now you know why you are working on the towel. 

Take a very good look at where everything (is supposed to) fit and make sketches if necessary. Carefully remove all of the posts and their brass pins, also all brass contact plates, springs and ball bearings. Clean everything with electrical cleaning fluid and rub the brass strips with FINE sandpaper until everything is shiny.

Replace all strips into their little sockets- keep them clean – NO grease yet.  Replace each of the brass pins and GENTLY replace each post into its socket,  Do NOT damage the plastic housings,  It is very obvious where each one goes (you DID make a sketch didn’t you?). Then hold each ball bearing with forceps (borrow your partner’s eyebrow tweezers if necessary) and dunk each one into a tub of Vaseline until it is liberally covered and sticky, One hole at a time, drop in ONE ball bearing, followed by one spring. (That way you know which holes have the bottom ball bearings refitted).

Now for the tricky bit! One ball bearing at a time, dunk each into the Vaseline and sit it on top of a spring – the gunk will keep it in place – you hope.

GENTLY align the slots in the cover plate with the control posts and lower it until it snaps into place. Hold it down and give it a little shake – you should NOT hear any balls rattling around,  If you do, remove the cover and try re-seating the balls and/or springs again.. Do not replace the bottom screw until you are sure you have got is all right. If necessary, take more Vallium and/or strong drink and persist.

Finally, replace the switch pack into the seat housing, replace the main battery lead, start the vehicle and try the seat switches. If the seat now adjusts correctly, take more strong drink because you have (probably) fixed the problem. If only the mirrors move but not the seat, the problem is in the seat ECU and fixing that will be the subject of a different post.

 Be comforted by the knowledge that this first I did this it took me half a day – now I can do the entire job in less than an hour.

Changing the transfer case on a Classic Range Rover

There are several good articles on the Internet about this job, but as someone who has just done it, here are some hints not generally covered elsewhere:

The symptom is usually a loud banging noise occurring under load – meaning when taking off and/or climbing a hill etc. It is cause by a worn drive chain that is slipping – best to fix it before it gets worse.

The chain itself can be replaced, but it is expensive, the case has to come out of the vehicle anyway and the replacement of the chain can take several hours – not including the removal and replacement of the case. Good second hand units can be found at reasonable prices – contact Graeme Cooper Automotive or another specialist Land Rover service specialist in your area.

Be warned – This is generally NOT a job you can do without a vehicle hoist, also a engine/gearbox lifting jack and a lot of patience.

Get the new case before you start removing anything on the vehicle. Make sure you get new seals and prop-shaft bolt and nuts, gear oil and silicone sealant.

With the vehicle on the hoist. drain the oil (do NOT lose the plugs – you will probably need them for the replacement case), remove both prop shafts. For this you need a pair of open ended spanners for each bolt. It is a nasty job because of the difficulty of getting the spanners onto the nuts.

Remove the transmission brake cable, speedometer cable, the sensor plug, the “fore and aft” metal stay and tape these out of the way. Remove the brake drum.

Support the gearbox (not the transfer case) on the lifting jack. Remove all of the bolts securing the transfer case to the gearbox. The top one is actually a stud and does not need to be removed – the case will slide off it.

Unbolt and remove the two gearbox mounts. Move the cross member under the gearbox (the tubular one with flanges at each end) out of the way by removing the four mounting bolts and hammering the unit downwards to provide as much space as possible between it and the transfer case, but do NOT remove it completely, because you may never get it back in. Most likely it will be jammed tight between the chassis side rails). It should NOT be necessary to remove the exhaust pipes.

With the jack, lower the rear end of the gearbox and transfer case and pull it downwards and backwards to clear the drive shaft, then remove it from the vehicle.

Sit the replacement case next to the old one in precisely the same alignment so you can see what has to come off one and be fitted to the other.Clean up the main flange and smear it with silicone gasket material

Replacement is essentially the reverse of the removal, Probably the hardest part is aligning the drive shaft Do NOT forget to refill the oil – keep going until it reaches the upper hole then tighten the two plugs

Sounds easy? Like most other jobs of this kind, it is easier when you have done several already.