New water pump with no drain plug - Alfa Romeo Bulletin Board & Forums

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post #1 of 16 (permalink) Old 01-17-2017, 09:33 AM Thread Starter
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Exclamation New water pump with no drain plug

Hello,
i have purchased a new water pump for my 2000 GTV (3 outlets) from "Classic Alfa", but it hasn't the bleeding plug like the original one has. Is this critical? Or can i disconect the water hose that goes to the Inlet Manifold (Bypass hose i think), when filling the system with new coolant?

Thanks for any help!
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post #2 of 16 (permalink) Old 01-17-2017, 11:13 AM
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Original factory ones didn't have one, so no problem......

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post #3 of 16 (permalink) Old 01-17-2017, 11:23 AM
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The engine has a bleed screw somewhere on the intake manifold, depending on model. Bleeding there should be fine.
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post #4 of 16 (permalink) Old 01-18-2017, 10:24 PM
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I replaced coolant on my 1975 last week... just yanked the lower radiator hose and let it all drain out... refilled and drove for two hours. Will check back today and let you all know if the engine hasn't melted away...

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post #5 of 16 (permalink) Old 01-18-2017, 10:25 PM
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Originally Posted by sbadaro View Post
I replaced coolant on my 1975 last week... just yanked the lower radiator hose and let it all drain out... refilled and drove for two hours. Will check back today and let you all know if the engine hasn't melted away...

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That is after I gave up on finding the bleeding bleeding screw... photos anyone???

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post #6 of 16 (permalink) Old 01-19-2017, 08:13 PM
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Originally Posted by 101/105guy View Post
Original factory ones didn't have one, so no problem......
I respectfully disagree about the original pumps not having a bleed screw. It's shown in the cooling system diagram in my '73 owners manual.
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post #7 of 16 (permalink) Old 01-20-2017, 08:34 AM
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Originally Posted by Stooie View Post
I respectfully disagree about the original pumps not having a bleed screw. It's shown in the cooling system diagram in my '73 owners manual.
Photo?

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post #8 of 16 (permalink) Old 01-20-2017, 03:30 PM
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I have two NOS bleed screws sitting here on my desk, so what Bob says is perfectly correct.


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to all parts I have advertised on the BB so far. Plenty more! Just ask.
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post #9 of 16 (permalink) Old 01-20-2017, 03:48 PM
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Wink Always....

risky making broad claims about what features all Alfas had !
In the case of the water pump bleed screws, I have seen several pre-1970 examples without the screw when new.

My late 1969 1600S was a time warp original car with no bleed screw.

I know aftermarket ones have that feature and apparently 1973 had them when new.
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post #10 of 16 (permalink) Old 01-20-2017, 04:34 PM
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Photo?

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post #11 of 16 (permalink) Old 01-20-2017, 04:45 PM
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Oops! Maybe this is more what you were looking for.
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post #12 of 16 (permalink) Old 01-21-2017, 02:47 AM Thread Starter
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That's it! That is the screw my old pump had and the new one has not...
So my question is if i can bleed the system with the bleed screw on the intake manifold?

Thanks!
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post #13 of 16 (permalink) Old 01-21-2017, 05:54 AM
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So my question is if i can bleed the system with the bleed screw on the intake manifold?
Yes. Thatīs the way all the millions of people since 1962 have done that on 105 engines.

Why not first trying out if it works instead of getting worried for nothing ?

The bleeding screw in the water pump housing has been made for people who will not be patient enough to bleed the system correctly. Itīs btw not the highest point in the coolant system, so you canīt bleed the whole system with that screw either. You only can bleed the water pump housing.
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post #14 of 16 (permalink) Old 01-21-2017, 07:53 AM
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Originally Posted by hunttheshunt View Post
Yes. Thatīs the way all the millions of people since 1962 have done that on 105 engines.

Why not first trying out if it works instead of getting worried for nothing ?

The bleeding screw in the water pump housing has been made for people who will not be patient enough to bleed the system correctly. Itīs btw not the highest point in the coolant system, so you canīt bleed the whole system with that screw either. You only can bleed the water pump housing.
Correct. I filled mine only last week after fitting a re-cored radiator.
Mine DOES have a bleed screw on the pump, but I've never used it.
Just use the one on the inlet manifold.

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post #15 of 16 (permalink) Old 01-21-2017, 03:17 PM Thread Starter
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Thumbs up

Thanks guys!

This forum never fails!
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