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Nuthinfancy
12-09-2006, 03:26 PM
Hey guys i did a head gasket job on my 1990 BMW 525i (M20) and unfortunatlly I did not take pictures before so now im stuck somewhere. There is a place for a 3/4in hose roughly towards the back of the motor on the drivers side sticking out of the cylinder head, it appears to be a coolant hose, but I am not sure where it leads to! If someone knows please help me out! Thank You
DaveVoorhis
12-09-2006, 03:32 PM
As I recall, that hose goes to the throttle body water jacket.
Nuthinfancy
12-09-2006, 03:53 PM
where in the heck is that?
E34-520iSE
12-09-2006, 03:56 PM
Do you mean the big one right at the back of the cyl. head, a sort of bolted-on aluminium pipe outlet thingy?
DaveVoorhis
12-09-2006, 04:33 PM
where in the heck is that?
There are two coolant hose nipples on the left side of the throttle body, below the crankcase ventilation hose nipple. Those are for the throttle body water jacket. There are shaped hoses for hooking that up. One side (doesn't matter which one) goes to the nipple at the back of the head, the other on the bottom of the thermostat housing, if I recall correctly.

Unless, of course, as E34-520iSE suggests, you're referring to the larger hose at the back of the head that goes to the heater valves.

See http://realoem.com for diagrams.
Nuthinfancy
12-09-2006, 05:05 PM
Do you mean the big one right at the back of the cyl. head, a sort of bolted-on aluminium pipe outlet thingy?

Yes I believe so!
Nuthinfancy
12-09-2006, 05:09 PM
Unless, of course, as E34-520iSE suggests, you're referring to the larger hose at the back of the head that goes to the heater valves.

See http://realoem.com for diagrams.

Yes I do believe that is the one, it looks to me like it runs coolant but I am also unsure of that, becuase there really isnt anywhere that it can go.
Nuthinfancy
12-09-2006, 05:18 PM
OK here is the diagram of the spout (it is #15).
http://realoem.com/bmw/diagrams/a/k/1.png

Also since I found the diagram of the other hose I couldnt figure out wher it went to i Figured id post that to (its #19) on the following diagram, where does it go?

http://realoem.com/bmw/diagrams/b/g/10.png
DaveVoorhis
12-09-2006, 08:00 PM
It's not shown on that diagram, but as I recall it's the hose that goes to the auxiliary water pump if you've got one, or to the heater valves if you don't.
Nuthinfancy
12-10-2006, 08:49 AM
How about that one in the top diagram, do you know?
winfred
12-10-2006, 09:31 AM
19 is about a 1/2" hose that goes to a nipple on the block by the starter, the hose that goes to 15 goes straight out to the heater plumbing by the brake booster, i can't remember the exact fitting it attaches to weather it goes to the pump or the valves right above the pump
DaveVoorhis
12-10-2006, 09:32 AM
That's the first one I mentioned. It's a shaped hose that runs from a nipple below the rear of the intake side of the head to the throttle body water jacket.
E34-520iSE
12-10-2006, 10:37 AM
Here's a pic of my car, showing the hose that comes out of the back of the head. It goes directly to the heater valve 'IN' connector. As you can see, there are three pipes to the heater matrix. The first one is a RETURN pipe to the t/stat housing, and the other two, well they are pretty obvious in the pic!

HTH,

Shaun M
http://www.geocities.com/stereowizard2004/ABCD0001.JPG
Nuthinfancy
12-10-2006, 11:33 AM
hey guys I found them both before I even came back to this thread, thanks for the help! :)