Re: removing fan to replace water pump on 1994 318is bmw
Not sure if it is the same, but I have a 1996 328i and the fan is attached to the front of the water pump via a large nut. That nut is a 32 mm (1 and 1/4 inch fits it as well), and is BACKWARDS threaded (i.e right to loosen and left to tighten). You may need to use a pair of vise grips and lock onto the belt to keep the entire front of the motor from turning. I have also heard giving it a few good whacks from a rubber mallet tends to get them to break free. If you do have to use the Visa grips on the belt be careful to not break your water pump pulley. Although it looks to be made of metal it is actually made of plastic and will break if it gets caught up in the tension of turning that fan nut. When the motor is running it is turning in the tightening direction, so I put some anti-sieze on the threads before re-installing. Hope that helps.
- If you need clarification, ask it in the comment box above.
- Better answers use proper spelling and grammar.
- Provide details, support with references or personal experience.
Tell us some more! Your answer needs to include more details to help people.You can't post answers that contain an email address.Please enter a valid email address.The email address entered is already associated to an account.Login to postPlease use English characters only.
Tip: The max point reward for answering a question is 15.
STOP what you are doing before you damage something!! Whatever you are trying to remove is not the water pump. Neither the sparkplugs nor the "timing belt" cover needs to come off. Remove the fan belt. Remove the fan (the nut is LH thread- means it turns left to tighten and right to loosen). You will need a large wrench (32mm) availible at sears.The water pump is directly behind the fan and is held in by 4 10mm bolts.
u will have to 1st remove the clutch fan, and losen the belt by turning the tensioner,then remove the fan shroud,this will allow you to remove the fan completely,then once the fan is removed this will allow you ful access to the water pump.at times the pump will be seized onto the engine block so it may require some shaking back and forth.once removed,you can use a thin coat of vascaline to seat the new gasket onto the new pump...good luck.
I am not aying that this is what I think it is but I found this on your year BMW
Some BMW, Volkswagen and Audi cars have a common problem that the water pump
impeller becomes dislodged from the input shaft of the water pump
leaving the water pump looking ok from the outside, but failed on the
inside. If your car experiences this problem it will over heat rapidly
much like a thermostat failure. For exact specific repair procedures for
this repair visit our online repair manual page.
Failed BMW, VW, Audi Water Pump
Check Water Pump Operation
- To troubleshoot this problem first drain about a half a gallon out of
the cooling system, next remove the thermostat from the engine. With
the thermostat out start the engine (stand back) coolant should be
forced out of the thermostat port, if not the impeller has dislodged
itself from the water pump input shaft and needs to be replaced. To
replace the water pump finish draining the remainder of engine coolant,
remove the serpentine belt and coolant hoses. Next remove the water pump
mounting bolts and remove the water pump. Clean gasket surfaces and
reinstall new water pump and reassemble. Refill with coolant and recheck
system, top off engine coolant after it has re-cooled.
To get the viscous clutch of the water pump you first need to remove the belt pulley and remove the water pump. Then put the impeller of the water pump in a vice and using a 32 spanner screw the viscous clutch off. Note that the bolt on the viscous clutch is of left hand thread so you have to unscrew the opposite way to a normal bolt.
Not much really. I did my son's on the road in 20 degree weather. Remove the fan nut 1.250" wrench...left handed thread with the special tool. Remove fan, and shroud at the same time. Remove belly pan so you can drain the radiator. 16mm socket and 1/2 socket wrench to move the idler pulley tensioner. You move it not remove it. You move it enough to release serpentine tension. Remove belt. and 4 bolts holding the water pump pulley. Now the water pump is exposed. remove the bolts or nuts holding it in. go get some 6mm x 30mm hex bolts and use them to pry out evenly the water pump. That's it. reassemble, don't forget the o-ring.
Disconnect the negative battery cable. Drain the cooling system.
Remove the distributor cap and rotor. Remove the rotor adapter, the dust shield and the distributor housing.
Remove the fan. The fan must be held stationary with tool 11 5 030 or some sort of flat blade cut to fit over the hub and drilled to fit over 2 of the studs on the front of the pulley. Remove the fan coupling nut; left hand thread-turn clockwise to remove.
Remove the belt and pulley.
Remove the rubber guard and distributor and or upper timing belt cover.
Compress the timing tensioner spring and clamp pin with the proper tool.
Observe the installed position of the tensioner spring pin on the water pump housing for reinstallation purposes.
Remove the water hoses, remove the 3 water pump bolts and remove the pump.
Clean the gasket surfaces and use a new gasket.
Install the water pump in position. Note the position of the tensioner spring pin. Torque M8 bolts to 16-17 ft. lbs. (20-24 Nm) and M6 bolts to 6-7 ft. lbs. (8-10 Nm). Connect the hoses.
Release the tensioner from the holding pin. Install the upper timing cover. Install the pulley and tighten the bolts to 6-7 ft. lbs. (8-10 Nm). Install the belt and tighten.
Install the fan, distributor housing and dust shield. Tighten the rotor adapter to 39-47 ft. lbs. (55-65 Nm). Install the rotor, O-ring and cap.
Very tricky there what your asking you need to remove alot of parts to get it done but its possible. You must remove the radiator than the engine plastic cover than remove all the belts and everything in the way. Along with being able to remove the reverse threaded fan clutch which you need a special tool to hold it while you undue the 22mm or 32mm bolt from the fan clutch bolt than you remove all the water pump bolts good luck
remove the radiator to have better access. remove all the belts now here is the hard part you need to make your own tool or buy the bmw tool to hold the fan belt pulley by the 10mm bolts some how there are many tools that you can use for this just be creative sometime weding a bolt or a big screwdriver does the job too in between the pulleys than loosen the 32mm nut which you can get that wrench at a bicycle shop for a few buck unless you have a bench grinder and can grind a 32mm down to half its thickness or buy the bmw fan pulley wrench and holder there expensive than just remove the water pump. Sometimes they will not come out very easy just to let you know the times I've changed them in my car or others I have had to beat on them with a Hammer to break them off they seize up in there pretty darn good and once you break them you have to continue till its out I recomend any water pump that has a metal impellar or you might end up being stuck doing this job again in the next 6 months make sure the part is German trust me its worth it. Good luck