getting hot

[fhurt]

first bmw and i could use some help it is a 1984 733i 5 speed the temp guage creeps up to center then on up to the red i dont have the owners manuel so i don't know were normal is and all so elec. fan doesn't come on, does this fan only work when a/c comes on i have changed hoses and clutch fan and opened bleeder screw and bleed the air out i could really use so expert help from you all thanks

[KC Ron Carter]

Most slow overheat issues on BMW are the fan clutch.

If you can put a rolled newspaper, in the rotating fans path and stop it with the engine warm the clutch needs a new home.

The big nut that holds the fan clutch is left hand thread and is 32 mm in size.

Did you ever wonder why they call the pliers in the tool kit, water pump pliers?

Later,

[fhurt]

thanks for comming in to help i have already changed the clutch fan were should the temp guage be during normal operation thanks again

[Boinggg]

I had the same problem.I changed the aux.fan and car is working very well.Heat gauge is right where it should be, right in the middle.....

[cassie's_dad]

I've got a "79" and when it gets hot ( 3/4's up) if I shut it off it won't start again till the engine cools off, like it's vapor locking or something. I also notice the "fuel vacume solenoid?" rests right on top of the radiator hose so I attached a block of wood there to try to help insulate it. anybody know a better way to keep this from happening?? Thanks

[KC Ron Carter]

Fuel pump check valve.


I could replaced the fuel pump for $200 but I fixed the problem by putting in the fix from BMW for about $3.50,
part # "16 14 9 068 988"

Now the engine starts on first turn, hot or cold, overnight or after
standing for a while.

Diagnosis:

The check valve in the main fuel pump was leaking allowing the fuel injector rail residual pressure to bleed off resulting in formation of a huge fuel vapor bubble in the fuel rail and back down the fuel line toward the pump.

The extra cranking time was needed by the fuel pump to recompress and
eliminate the fuel vapor bubble in the line and repressurize the fuel injector rail.

Installation can be anywhere in the fuel pressure line but next to the main pressure pump is best.

It is a two screw clamp job.

Later,