Reverse water pump or not - how tell? - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

aaberg · 07-14-2020, 01:11 PM

I will replace my water pump on my Camaro 2012 2SS with L99-engine. Read that two different pumps sells, one regular and one with reverse rotation (counterclockwise). There are no numbers on my old pump. How do I know what to choose?

Example: https://www.summitracing.com/int/sea...rand%3Aacdelco

HDRDTD · 07-14-2020, 03:08 PM

GM Parts direct shows this for your 2012.
Home 2012 Chevrolet Camaro Water Pump 19207665
Engine Water Pump Assembly - GM (19207665)

https://www.gmparts2u.com/oem-parts/...Y4LWdhcw%3D%3D

That GM part number matches the 1st water pump listed at Summit.

ACDelco 19207665 - ACDelco Mechanical Water Pumps
Click here for more information about ACDelco 19207665 - ACDelco Mechanical Water Pumps
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Water Pump, Mechanical, Standard-volume, Aluminum, Natural, Chevy, 6.2L LS, Each

Not Yet Reviewed

Part Number: ADO-251-734 More Detail...

Estimated USA/International Ship Date: Today

gtstorey · 07-14-2020, 03:41 PM

You could look at which direction you pulley is turning, unless you already have it torn down.

aaberg · 07-24-2020, 02:55 AM

The problem is that my engine is removed and down for restoration. I have this pic:

Wikipedia says: Water pump pulleys running on the inside surface of the belt indicate a Standard Rotation water pump (grooved side of belt). Water pump pulleys running on the outside surface of the belt indicate a Reverse Rotation water pump (flat or smooth side of belt).

Any ideas?

gtstorey · 07-24-2020, 08:53 AM

I don't have easy access to my car right now but it looks like all the parts places agree that all three listed on Summit link you posted work. There isn't really much that says the 19207665/251-734 turns a different direction than the other two. It is the one listed on the AC-Delco website as Camaro SS V8 OEM equipment. The 19339913/252-975 is listed for the AC-Delco "professional" series for the same car. The 19337228/252-975 is listed as "professional" series for other GM LS V8 cars including the ZL1. likely all three will work, but might be slight difference in the last with the actual pulley.

If the picture you posted is you car, I'm pretty sure LS cranks turn clockwise, which means the water pump is turning counterclockwise.

aaberg · 07-24-2020, 09:55 AM

Yes, the picture is my car and according to wiki it should be counterclockwise. Someone, any other opinion?

07-14-2020, 01:11 PM	#1
aaberg Drives: 1997 30th conv & 2012 45th conv Join Date: Jul 2017 Location: Sweden Posts: 122 View My Garage	Reverse water pump or not - how tell? I will replace my water pump on my Camaro 2012 2SS with L99-engine. Read that two different pumps sells, one regular and one with reverse rotation (counterclockwise). There are no numbers on my old pump. How do I know what to choose? Example: https://www.summitracing.com/int/sea...rand%3Aacdelco

07-14-2020, 03:08 PM	#2
HDRDTD Drives: 2013 Triple Black ZL1 Vert M6 ECF Join Date: Mar 2011 Location: Trenton, Michigan Posts: 7,047	GM Parts direct shows this for your 2012. Home 2012 Chevrolet Camaro Water Pump 19207665 Engine Water Pump Assembly - GM (19207665) https://www.gmparts2u.com/oem-parts/...Y4LWdhcw%3D%3D That GM part number matches the 1st water pump listed at Summit. ACDelco 19207665 - ACDelco Mechanical Water Pumps Click here for more information about ACDelco 19207665 - ACDelco Mechanical Water Pumps Compare Water Pump, Mechanical, Standard-volume, Aluminum, Natural, Chevy, 6.2L LS, Each Not Yet Reviewed Part Number: ADO-251-734 More Detail... Estimated USA/International Ship Date: Today

07-14-2020, 03:41 PM	#3
gtstorey Drives: 2010 Camaro SS2,L99, LSA SC Join Date: Aug 2017 Location: Huntsville, AL Posts: 2,146	You could look at which direction you pulley is turning, unless you already have it torn down.

07-24-2020, 02:55 AM	#4
aaberg Drives: 1997 30th conv & 2012 45th conv Join Date: Jul 2017 Location: Sweden Posts: 122 View My Garage	The problem is that my engine is removed and down for restoration. I have this pic: Wikipedia says: Water pump pulleys running on the inside surface of the belt indicate a Standard Rotation water pump (grooved side of belt). Water pump pulleys running on the outside surface of the belt indicate a Reverse Rotation water pump (flat or smooth side of belt). Any ideas?

07-24-2020, 08:53 AM	#5
gtstorey Drives: 2010 Camaro SS2,L99, LSA SC Join Date: Aug 2017 Location: Huntsville, AL Posts: 2,146	I don't have easy access to my car right now but it looks like all the parts places agree that all three listed on Summit link you posted work. There isn't really much that says the 19207665/251-734 turns a different direction than the other two. It is the one listed on the AC-Delco website as Camaro SS V8 OEM equipment. The 19339913/252-975 is listed for the AC-Delco "professional" series for the same car. The 19337228/252-975 is listed as "professional" series for other GM LS V8 cars including the ZL1. likely all three will work, but might be slight difference in the last with the actual pulley. If the picture you posted is you car, I'm pretty sure LS cranks turn clockwise, which means the water pump is turning counterclockwise.

07-24-2020, 09:55 AM	#6
aaberg Drives: 1997 30th conv & 2012 45th conv Join Date: Jul 2017 Location: Sweden Posts: 122 View My Garage	Yes, the picture is my car and according to wiki it should be counterclockwise. Someone, any other opinion?