9 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHWaterpump impeller size
Leading reported evidence
Run pump
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
Discussions that performed work without a confirmed outcome
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Performed · outcome unconfirmed
10, ran pump with electric drill till it turned pretty free
Leading evidence: 'Run pump' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, the most frequently mentioned possible cause is 'correct impeller size' (1 discussions; 0 report identifying it and 1 suggest it). The most frequently discussed action is 'Replace with the block castings' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
Source reports, not a diagnosis or a success probability. Counts refer to discussions and can overlap.
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
Discussions that suspect a cause
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Suspected cause · Original poster
The final chapter: Went to Scottsdale Porsche this morning and bought a new waterpump and could tell right away that it was the correct impeller size.
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
Discussions that contain suggestions
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Suggestion
Possibly some sort of running change with the block castings?
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
Discussions that contain suggestions
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Counts describe captured discussions, not unique people or a diagnosis. Author identities are not reliably stored. Exact duplicate evidence is counted once across matching discussions; one discussion counts at most once per action/state. Multiple repairs reported together remain a combination. Suggestions and failed attempts do not establish a fix. Matches cover whole discussions and can include related faults, model variants and incomplete threads.
9 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Rennlist: 1 discussions
0 evidence records excluded for query context · 0 excluded by outcome qualification · 0 adjusted by outcome qualification.
0 acknowledgements have no verified action link; they do not establish a repair result.
Generation: 20261026T213932Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
I just purchased a waterpump from ECS tuning. Have never had a problem with them in purchasing 996 or bmw parts until now. I ordered a water pump for the 996, it's a porsche part. Unistall the old pump (bitch) install the new and it won't turn. Pull the new pump off and the impeller is just over 1/16 of an inch wider than the old pump. I am so glad I found this out before I put it all together and just started the car. Otherwise, it would have broken those impellers for sure. Anyone of you had this happen? Guess I will have to wait until Monday now and go to the dealer and get one. What a pain.
it is a plastic impeller? What I am about to say it TOTAL speculation from my own experiance.
I replaced mine a year or two ago and I also had an issue.
1, I pulled the pump down past torque spec.
2, this crushed the gasket too far
3, New gasket
4, redo job and pull to proper spec
5, Unit still rubbed on surface of block
6, pulled unit off AGAIN.. PISSED THIS TIME
7, noticed the block had like a sand paper finish where contact was made wtih the impeller.
8, new gasket reinstall, still rubbed SLIGHTLY
9, ASSUMED this was the way it was to be and the course block would sand down the impeller and seat it to make an unreal seat
10, ran pump with electric drill till it turned pretty free
11, started car and ran it... never looked back. 30K miles ago
I had the same thing happen to me with a new 997 WP that is supposed to be a replacement for the 996 WP. I also caught it before starting the car. I got mine from a dealer and they apologized. Seems like there must have been a number of those WPs because most folks don't have that issue with the 997 WPs.
IT is plastic impeller. Given the amount of difference in width of the impeller I don't want to risk the block sanding the impeller. There is a good chance it could break the impeller, then I could have pieces in the block. I would be surprised if Porsche designed the water pump this way. I'll let you know what Porsche says tomorrow.
Mine was replaced with the "old" 996 WP by the dealer I purchased it from. The 997 impeller that I got was >1/16'' bigger than the 996 WP impeller. The 997 WP would not turn inside of the housing.
I would say your car had some other issue like the OP has because I know of several top porsche mechanics that routinely install the 997 water pump in the 996 now and consider it standard procedure as well as an upgraded part.
The final chapter: Went to Scottsdale Porsche this morning and bought a new waterpump and could tell right away that it was the correct impeller size. Going to send the one I bought from ECS back. Porsche Scottsdale one was more expensive but I can't wait. Everything went in fine. Test drive, water pouring out the back end. I ended up somehow braking a plastic part that connects two upper coolant hoses. What a mess. Fixed that. Cleaned up the engine. Now working as it should. Beer. MNF.
This is a source reference. Confirm exact model applicability in the original material.
