12-12-2008, 01:08 PM
Hi guys, I'm posting this info for people who didnt know some facts about RB series water pumps and interchangability with pictures to show the difference and which ones that can be used in multiple appications.
Here are the commonly found RB water pumps lined up side by side.
From Top to bottom row.
1)Top one is from a RB20DET engine, they can only be used on a RB20 series engines, the top hole is not slotted and is slightly offset so it doesnt seem to fit other RB's.
Part# 21010-70TY5
2)Second one from the top is from a RB25DET engine, this is also one of those pumps that fits the RB25DET, again, fitment on other RB doesnt seem feasable as the hole is not slotted and is slightly offset towards the left. The casting design seems slightly different as well, it seems to look slightly shallower then the other models.
Part# 21010-AA527
3)Third one from the top is from a standard RB26DETT, this one is able to fit on any RB series engines ranging from RB20DE, RB25DE, RB20DET, RB25DET, and RB26DETT of all series. This one has the hole slotted to fit multitudes of RB engines, this is ok to use on any RB engine.
Part# 21010-21U26
4)Forth one from the top is from a RB26DETT N1 specification engine, this one fits the same as the one above, it fits all RB engines of all series, but what makes this pump special is the anti-cavitational 6 blade impeller instead of the others that have a 8 blade non backing plate designs. This pump originates from the Skyline R34 N1 models, this is a ideal upgrade for those guys who like to wind up the RB since this limits the coolant caviation to a minimum.
Part# 21010-24U27
http://i21.photobucket.com/albums/b273/twinturboz/RB%20WATER%20PUMPS/HPIM2161.jpg
http://i21.photobucket.com/albums/b273/twinturboz/RB%20WATER%20PUMPS/HPIM2162.jpg
http://i21.photobucket.com/albums/b273/twinturboz/RB%20WATER%20PUMPS/HPIM2163.jpg
http://i21.photobucket.com/albums/b273/twinturboz/RB%20WATER%20PUMPS/HPIM2165.jpg
http://i21.photobucket.com/albums/b273/twinturboz/RB%20WATER%20PUMPS/HPIM2167.jpg
Notice how the N1 spec impeller differs from the rest of them?
http://i21.photobucket.com/albums/b273/twinturboz/RB%20WATER%20PUMPS/HPIM2168.jpg
http://i21.photobucket.com/albums/b273/twinturboz/RB%20WATER%20PUMPS/HPIM2170.jpg
Side note: For those of you that install the RB pumps with the slotted holes, you must be very careful applying the silicone sealant around the slotted hole. If not enough is applied it will start to leak around that area as the surface area for sealing is very small. Pay particular attention to that slotted area when installing!
Here are the commonly found RB water pumps lined up side by side.
From Top to bottom row.
1)Top one is from a RB20DET engine, they can only be used on a RB20 series engines, the top hole is not slotted and is slightly offset so it doesnt seem to fit other RB's.
Part# 21010-70TY5
2)Second one from the top is from a RB25DET engine, this is also one of those pumps that fits the RB25DET, again, fitment on other RB doesnt seem feasable as the hole is not slotted and is slightly offset towards the left. The casting design seems slightly different as well, it seems to look slightly shallower then the other models.
Part# 21010-AA527
3)Third one from the top is from a standard RB26DETT, this one is able to fit on any RB series engines ranging from RB20DE, RB25DE, RB20DET, RB25DET, and RB26DETT of all series. This one has the hole slotted to fit multitudes of RB engines, this is ok to use on any RB engine.
Part# 21010-21U26
4)Forth one from the top is from a RB26DETT N1 specification engine, this one fits the same as the one above, it fits all RB engines of all series, but what makes this pump special is the anti-cavitational 6 blade impeller instead of the others that have a 8 blade non backing plate designs. This pump originates from the Skyline R34 N1 models, this is a ideal upgrade for those guys who like to wind up the RB since this limits the coolant caviation to a minimum.
Part# 21010-24U27
http://i21.photobucket.com/albums/b273/twinturboz/RB%20WATER%20PUMPS/HPIM2161.jpg
http://i21.photobucket.com/albums/b273/twinturboz/RB%20WATER%20PUMPS/HPIM2162.jpg
http://i21.photobucket.com/albums/b273/twinturboz/RB%20WATER%20PUMPS/HPIM2163.jpg
http://i21.photobucket.com/albums/b273/twinturboz/RB%20WATER%20PUMPS/HPIM2165.jpg
http://i21.photobucket.com/albums/b273/twinturboz/RB%20WATER%20PUMPS/HPIM2167.jpg
Notice how the N1 spec impeller differs from the rest of them?
http://i21.photobucket.com/albums/b273/twinturboz/RB%20WATER%20PUMPS/HPIM2168.jpg
http://i21.photobucket.com/albums/b273/twinturboz/RB%20WATER%20PUMPS/HPIM2170.jpg
Side note: For those of you that install the RB pumps with the slotted holes, you must be very careful applying the silicone sealant around the slotted hole. If not enough is applied it will start to leak around that area as the surface area for sealing is very small. Pay particular attention to that slotted area when installing!