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FAQ / REFERENCE => How-To's => Topic started by: Carrolatoso on May 24, 2011, 08:28:37 PM

Title: Nipple is gone!
Post by: Carrolatoso on May 24, 2011, 08:28:37 PM

The inlet nipple that connects to the heater hose is totally corroded. Removed what was left.  What do i do next?

Title: Nipple is gone!
Post by: DesktopDave on May 24, 2011, 08:35:34 PM

New heater valve or inlet tube?  I'm not entirely sure what you mean by inlet nipple.

Is it #4 or #5 on this diagram (http://www.realoem.com/bmw/showparts.do?model=AJ93&mospid=47318&btnr=64_0514&hg=64&fg=15) or #13 on this diagram (http://www.realoem.com/bmw/showparts.do?model=AJ93&mospid=47318&btnr=64_1720&hg=64&fg=15)?  Dealer will have those parts, but they'll be expensive.

Title: Nipple is gone!
Post by: Carrolatoso on May 24, 2011, 08:37:56 PM

It goes to hose 23

Title: Nipple is gone!
Post by: Carrolatoso on May 24, 2011, 08:44:19 PM

Its part of the head . Bottom right corner

Title: Nipple is gone!
Post by: DesktopDave on May 24, 2011, 09:34:21 PM

#23 in this diagram (http://www.realoem.com/bmw/showparts.do?model=AJ93&mospid=47318&btnr=11_1272&hg=11&fg=35)?  Wow, that's a tough one.  I'd say it depends on how far you want to go with the car.  A machine shop would be able to bore out & press a new part in with little trouble, but taking the head off for such a repair is a lot of work.

If it was my car, I'd consider using epoxy to secure a tin fitting like the heater core lines above.  Or maybe an air compressor fitting of some sort?  You could tap some threads into the head & possibly use a fairly large male threaded fitting (1/2" ID?).  I'm unsure of the proximity of oil passages in that area, but I'd guess you'd be safe.

Title: Nipple is gone!
Post by: Carrolatoso on May 24, 2011, 11:25:27 PM

I think the tapping idea is the most practical way to go.  I will let you know how this turns out.  First I have to get the tools.  Thanks DesktopDave!

Title: Nipple is gone!
Post by: DesktopDave on May 27, 2011, 02:25:12 PM

I'd be very tempted to use an alu fitting, though they're hard to get.  Copper or brass doesn't have the same thermal expansion rate as the head does.  I'd worry that it'd eventually leak.

Something like this (http://shop.hoseandfittings.com/catalog/Fitting/Aluminum/Hose_Barb/Bump_Tube_-_Male_Pipe/4404-06-04-AL.html), perhaps?  Alu barb fitting; they're only $10.  I'm not sure of the measurements though.  I'll bet any hydraulic shop could help you out - take what's left of the spigot & see what they say.  I'll bet any forklift repair shop deals with stuff like this all the time.