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I need bmw E23 (1986 735i/L7) instructions for replacinga water pump/thermastat. Thanks.

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To replace water-pump/thermostat you will require few tools as mentioned below:-- -32mm open end wrench, thinner than standard, for fan nut.
-Any bicycle shop will have these for headsets.
-Strap wrench
-This replaces making the special tool to hold the fan pulley
-Cheap and available at places like Autozone
-Screwdriver, straight slot
-Socket set, metric
-Screwdriver handle and 1/4"-drive extension are handy for reaching hose clamps.
-Box end wrench, 10mm
-Threadlocker, medium strength ( Permatex Loctite blue)
-Dielectric grease is nice for the electrical connectors, Autozone has CRC in a compressed dispenser can.
-Scotch-brite pad
-Hose remover. -------------------- -Drain radiator
-Plastic screw on the bottom-left of the radiator
-(optional) Drain plug(s) on lower side(s) of engine

-Remove intake filter box, for access to hoses.
-One electrical connector
-One 10mm hex head bolt at the rear of the box
-Two clips to the intake tube
***Other writups indicate taking off the mass-airflow-sensor, I didn't find it in the way.
-Maybe helpful if you're taking the thermostat off without removing waterpump.

-Remove fan shroud and expansion tank
-Two electrical connectors under the right side of the expansion tank
-Unplug the thermometer on the radiator next to the expansion tank.
-Remove hose on bottom of expansion tank (6mm hex on all hose clamps), lots of coolant will flow.
-This is a good time to detach the lower radiator hose below the expansion tank.
-Remove two plastic rivets holding top of fan shroud on, one each side.
-Pull the center of the rivet out about 1/4", then pull the rivet body out.
-Lift the fan shroud up to expose the bleed hose on top of the radiator, detach hose, may need to cut it off.
-Lift the fan shroud up and out with expansion tank
-Wiggle and pull, may need to flex the shroud a bit, the shroud bottom will fit between the radiator and fan.
-Remove bleed screw next to expansion tank cap to separate expansion tank from fan shroud.

-Remove the radiator
-Release the plastic latches on the top by putting a straight-slot screwdriver in them and prying gently.
-Lift the right (passenger) side first, get it over the sheet metal, then shift the radiator to the right while lifting.
-The A/C lines on the right flexed enough to make room on my car, didn't need to bend them permanently.

-Remove accessory belt
-Loosen the tensioner, belt will fit over the fan.

-Remove the fan
-Hold the fan pulley with the strap wrench or special tool.
-Turn the fan nut with 32mm wrench, righty-loosey for left-hand threads.
-Don't drop the fan, and I've heard you shouldn't lay the clutch flat.
Loosen and remove A/C belt. Here's the tensioner for the accessory belt, same as the A/C belt, just loosen the bolts. -Remove water pump with thermostat
-Remove hoses.
-Unplug 2 connections on top of thermostat and water pump.
-Remove 6 bolts, 10mm hex head
-The one behind the crank pulley is easily accessed with a 10mm box-end wrench.
-Loosen pump from block.
-You might need to pry a bit.
-There are two aluminum pipes entering the back of the waterpump, sealed by O-rings. O-rings seal the back ends of these pipes to the rear manifold. I followed previous writeups in keeping these pipes in the manifold, it looks like a lot of work to replace the rear O-rings, or even get the pipes back into the rear manifold.
-Clean sealing surface on block
-Very carefully with scraper, this block is aluminum, and scratches are likely to leak.
-Use a Scotch-brite pad to clean the residue, picking with scraper will eventually scratch it. Use Permatex blue sealant if you do gouge it.
-Take the pulley off water pump, handle it carefully, it cracks easily. Fasten it to the new water pump and put it somewhere safe.

Reinstall is the reverse. Clean all screw threads or replace. Put a small amount of Locktight/threadlocker on each screw.
The locktight helps seal the threads, and keeps them from loosening, so you aren't tempted to overtighten.
Don't overtighten!
------------- Click this link directly to check the exact diagrams and procedure for more help. ------------ Thanks. Keep updated for any more query. You can rate this solution and show your appreciation

Posted on Aug 07, 2010

  • norman886 Aug 07, 2010

    These are instructions and pics for E38 not E23. I don't think you have to remove fan or radiator on the E23. It has been a long time since I have replaced the water pump on an E23, so I really need some refreshing. The E23 is not found on Bimmerboard, at least I couldn't find it.

    Let me know what you think.




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