1992 BMW 7 Series 730i SE review from UK and Ireland

I recently bought this car with a known defect. it had an auto gearbox fault. it would not drive forward, but would drive backwards. I am a diy mechanic and have a lot of experience with big cars.

As I have previously repaired a bmw gearbox, (a zf 4hp22 4 speed) common to range rovers, jaguars and volvo's, or the 1990's I decided to have a go at repairing etc. the car was in near mint condition with 120k on it. full dealer service history too. imagine my suprise when I found that only the selector cable had broken! -it sounds unbelievable, but somehow it was pushing the selector arm out enought to engage the reverse and then neutral, but not the forward gears. how it got out of reverse is just weird, but i'n not complaining! hell knows who diagnosed it in the first place, but if it was via a telephone call to a gearbox shop they would have suspected the box I'm sure.

I replaced the cable for £15 the car is a dream to drive, tight and quiet, as it should be, everything in tip top order except the aircon is 'empty' it has two tappets that require adjustment, but these are straight forward to adjust, with just an allen key and feeler gauges when the rocker cover is off. (one hour) this is the M30 3.0 six engine. - a bullet proof engine, IF you change the oil and more importantly check the water level. if these cars lose a pint of water, they get too hot at the thermostat housing, and do not operate the temp sender (as its not now touching coolant) this overhates the engine, but doesn't necessarily tell you till a hose bursts It gives symptoms of head gasket failure, but the head cracks before the gasket goes, and you're in for a wallet busting repair. (replace head)

If your gearbox has 'slipped away' from forward drive and still goes backwards, then don't buy a new box, take out the old (a rotten job, but so is withdrawing £1000 from your account) and then unbolt the bellhousing pull it off, remove the front pump, and out comes a shaft that has a pair of small piston ring seal on it, you must change these, and the small 70mm set of six cluthes held in by a clip on the gearbox end of this shaft. one or more of these six clutches will have failed, this is 1st gear. -and the shims will need a change too, they may have welded to the clutches. these cost around £35 for the 1sr gear clutchpack, and a new filter, for around £15 too. That's IT! £50! take care with the front gasket, and reassemble, it will drive fine. your slipping box went OK int the other gars, so don't get cocky andd try and change the rest, as you will regret going any firther. These zf 4hp24 boxes were a good gearbox, but a poor design, and those shaft rings when worn, will allow the front clutch pack to be 'in gear' ie at full contact pressure when in neutral. did your car tend to creep a tiny bit before it went all 'slippy' when put back to neutral? search the web for '4hp24' and read about them.

This car drives a dream. it corners so well, like it should be smaller. I have had bmw 7's in the past and they were good too. and such value from a stupid showroom new price. -i got this one for just £200! not a mark on it, apart from a few stone chips. has anyone any comments on driving with an lpg kit on this exact model? as I intend to keep it for a couple of years. - avoid cars that still have metric tyre sizes. they cost too much, around £190 a tyre! many will have replace the alloys for 16 inch ones, however mine were nearly new.