Water Pump Hose Bib

[Norm C.]

The heater hose bib on the water pump is bare,,, yet its impossible to determine if it was painted with the water pump when the engine was painted. The aim doesn't reference the hose bib either way. Does anyone know if the hose bib was painted or added at the factory with the heater hoses? Thanks in advance for your help!

[Terry M.]

[Don L.]

Re: Water Pump Hose Bib

Interesting to note, the "bib" that goes in the intake manifold is referenced in the '72 AIM, however, like you guys, I don't see the water pump connection in the '72 AIM either.

Why would the upper bib be added @ St. Louis but not the lower? Terry's point about the lower bib being installed at the engine plant makes sense to me. He he taught me earlier in the week on the coil mounting hardware, however, I recall reading a recent thread that stated differerent bibs were used for different applications at the assembly plant. (long hex/short hex).

Hmmm.

[Terry M.]

Re: Water Pump Hose Bib

I remember that thread -- and I thought it was for AC or non-AC, and for mid-years. The engine plant had no clue if the car was to get AC or not during the early C3 years -- so that would require St. Louis to add those parts that changed with C60. That MAY be why the intake "bib" was installed at St. Louis.

Since I am not near an AIM at the moment -- take a look at the C60 section and see if there is a different part number for the intake "bib" -- if it is even shown. It may be part of the "schedule" that just lists part numbers since it installs the same regardless of the part number.

See if Patrick's pictures of his 1972 show the water pump "bib." That would give you one data point.

[Don L.]

Re: Water Pump Hose Bib

Thank you, Sensei. It is indeed covered in the air conditioning (C60) section of the AIM. I had my memory cross threaded. I remembered it as A.I.R. (K19) option that drove the use of a different bib. Doh!

Sure enough. Part number GM 331967 (nipple) was part of the C60 assy/install. Interestingly, there was an engineering change, dated 3-27-72, that had this part supercede GM 3739798 (nipple). Feed for a 72E - 72L issue?

I don't think Patrick's pics will help here. His car has a service replacement (plugged bypass outlet) water pump, therefore, don't see the bib originality as reliable. (Patrick, pls jump in here if you have certain history on the replacement work)

Norm's question remains, however, for those of us without the a/c option. Why wouldn't the bib be shown in section M5 (heater hoses) if it was installed @ St. Louis?

[Terry M.]

Re: Water Pump Hose Bib

Ah, the dreaded water pump failure. And early v late besides. Are we having fun yet?

Maybe someone else on this board has a reasonably original 1972 with the original water pump. I have one in mind, but the owner doesn't come here frequently -- I'll message him. It is however a mid to late car -- later than March -- with no AC.

Where the bib is shown would depend at what station it was installed. If it were installed during engine dress -- before the engine got to the chassis -- it would show up in the engine section. At least I think that is the way it works in general.

[John H.]

Re: Water Pump Hose Bib

The heater hoses, clamps, and nipples (both at the intake and at the water pump) are released in UPC 1 - that's where you'll find them.

[Norm C.]

Re: Water Pump Hose Bib

.......Maybe someone else on this board has a reasonably original 1972 with the original water pump. I have one in mind, but the owner doesn't come here frequently -- I'll message him. It is however a mid to late car -- later than March -- with no AC.

Thanks Terry and all... had not anticipated what seemed like a simpler question would have such intrigue To further clarify my original question... I am the orginal owner, very unmolested, base engine, 4spd, coupe, early production (November) with C-60. My question comes about as the upper fitting is aluminum, appears to possibly have the remnants of orange paint, but if so, very faint. Hence wanting to identify the paint question. I did see the AC option section in the AIM, but as pointed out here it didn't identify paint.

With the observation, that all engines were "created equal" at the engine factory, then that would seem to lessen the chances of being painted at the factory...BUT, we are talking about St. Louis here,,,, logic didn't always apply. Thanks again for all the input, this site continues to amaze me!!!

[Terry M.]

[Ralph S.]

Re: Water Pump Hose Bib

I am the original owner of a 73 small block with A/C and the nipple on the orig. water pump is painted orange.