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  #1  
Old 06-23-2013, 06:08 AM
anders anders is offline
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Default Bosch water pumps- buyer beware

So I recently purchased two bosch water pumps for my d24's. One has the good cast impeller and the other has the lower performing stamped steel impeller. I have always purchased the bosch pumps because of the cast impeller.
It looks to me they changed over to the cheaper to produce stamped impeller.
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  #2  
Old 06-23-2013, 11:48 AM
745 TurboGreasel 745 TurboGreasel is offline
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How do you all feel about the polymer impellers?
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  #3  
Old 06-28-2013, 04:39 PM
ngoma ngoma is offline
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I recently replaced my orig. cast impeller WP with a new GMB (smaller dia. BTW) stamped steel impeller WP during a timing belt change. Purposely did not change out the t-stat to run a little experiment. Currently the experiment shows little change in engine tendency to overheat. Engine runs same displayed temp as before, and has not risen during high load, also as before.

I kept the cast impeller WP with the idea to eventually rebuild it w/ new bearing and seal.
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  #4  
Old 07-03-2013, 03:25 AM
verdigo verdigo is offline
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Quote:
Originally Posted by 745 TurboGreasel View Post
How do you all feel about the polymer impellers?
I own and operate a Euro auto garage. The plastic impellers crack and as a result slip and do not pump. At times they shatter. The stamped steel ones come loose also. Cast impeller is best. VW uses plastic in all of their OE pumps.
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  #5  
Old 07-03-2013, 04:41 AM
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Jason Jason is offline
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I have had the Bosch pump in my engine for a while now... I know of a few members on the D24 list that have had great results with them.. They are the plastic impeller, but they are a copy of the original and its a very thick impeller by design, unlike the newer VW pumps that are thin crap. Given the choice a steel impeller would be best, but at this point I feel like we should be happy that much of anything is still being reproduced for these engines!

Jason
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