11 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHCrankshaft bearing noise
Reported or suspected cause
water pump, very happy about
Suggestion or failed attempt
No successful repair reported for this finding.
0
Identified cause
1
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0
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Read evidence and context
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Suspected cause · Original poster
Well as Richard correctly identified it was the water pump, very happy about that, removed the pump, quite an easy job, sadly bent the gasket pushing the pump back up to re fit and stupidly hoped it would not leak, but it did, so deep joy I get to do it again next week!
Leading evidence: 'water pump, very happy about' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, the most frequently mentioned possible cause is 'water pump, very happy about' (1 discussions; 0 report identifying it and 1 suggest it). The most frequently discussed action is 'Check crank pulley at the same time' (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.
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Suggestion
You will be able to check the crank pulley at the same time.
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.
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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.
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Suggestion · Original poster
As you will have the car jacked up at the rear to facilitate the pump change the water will tend to lay in the front of the car, i.e rads and pipes.
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Suggestion · Original poster
Secure the cap, open the vent and start the car, run for about 5 minutes and then open the cap, hold about 2000rpm on and slowly add any additional collant.
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Suggestion · Original poster
Secure the cap, open the vent and start the car, run for about 5 minutes and then open the cap, hold about 2000rpm on and slowly add any additional collant.
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water pump, very happy about
No successful repair reported for this finding.
0
Identified cause
1
Suspected cause
0
Reported fixes
Read evidence and context
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
Well as Richard correctly identified it was the water pump, very happy about that, removed the pump, quite an easy job, sadly bent the gasket pushing the pump back up to re fit and stupidly hoped it would not leak, but it did, so deep joy I get to do it again next week!
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.
11 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Porsche Club GB: 1 discussions
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Generation: 20261026T190023Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
My 2000 996 has started to make a scary noise tonight, I thought initially it was the alternator bearing, but when I got home I put a screw driver on the alternator engine running and all sounded normal, however when I looked around I noticed the crank pulley is moving about, back and forth, and I think the noise is there, any ideas?
I have stopped driving it but would appreciate any advice
Gary
The crank pulley is dead centre, and the water pump is lower and to the left. The crank pulley is a snug fit on the crankshaft, so if it is wobbling, then it is more likely that the pulley has failed than anything more untoward. Not that I have heard of it happening before.
The water pump, on the other hand, is more known to fail. The bearings can go, which would cause a wobble, but the plastic impeller blades also break up. They usually start leaking badly, which is normally the first sign.
If you are handy with spanners, the best thing to do is remove the drive belt, and spin the pump. You will soon know if the bearings have gone. You will be able to check the crank pulley at the same time.
Thanks Richard
I re checked it this morning and you are as always correct, it is the water pump, my initial panic of bearing noise threw common sense! I will order one today and fit at the weekend, after the re fill is it easy to bleed the system?
Gary
It can be a real pain. My advice is to drain as little as you can, and collect as much as possible of what drains/escapes, so you have an idea of how much needs to go back in. No doubt you will have the back of the car in the air, which will help a little to stop the front section from draining. Vacuum filling devices work best. Ideal if you could beg/borrow one.
Update:
Well as Richard correctly identified it was the water pump, very happy about that, removed the pump, quite an easy job, sadly bent the gasket pushing the pump back up to re fit and stupidly hoped it would not leak, but it did, so deep joy I get to do it again next week! The coolant re fill is interesting, but you need to take it slowly and it will bleed and fill.
As you will have the car jacked up at the rear to facilitate the pump change the water will tend to lay in the front of the car, i.e rads and pipes. When you have completed the job, leave the car on jacks, very very slowly add collant and water, wait each time for it the drain away with gravity, continue this until you cannot get anymore to flow. Secure the cap, open the vent and start the car, run for about 5 minutes and then open the cap, hold about 2000rpm on and slowly add any additional collant. Get her up to operating temp, with the valve open and drive locally for a few miles, each time she is cool add a little water, its a very small amount and continue this each time its cold until you can't add anymore. No stress, no mess and perfect temps.
