How to diagnose and replace a bad idler pulley - Porsche 911 996
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- Опубліковано 12 вер 2024
- The diagnostic procedure applies to just about any vehicle. I outline how to identify the bad pulley, remove it and install the new part.
EDIT: as a few viewers pointed out the bolt is actually 24mm.
Thorough explanation, presented with accurate part terminology and w/ good visual of the repair. I feel confident I could do this repair with your directions. Well done!
Steven Lutz - thanks! Glad you enjoyed the video.
My pulley has just gone bad. Great video. Thanks for the help
You're welcome - glad it helped you!
I just smoked mine in traffic (2006 911) , it’s surprisingly similar. I’ve replaced the alternator myself so I think I can handle this. I may do all 3 while I’m in there. (?)
Keep the old idler pulley. Get bearing number in it. Get the correct bearing and press out the old one press the new one in. OEM parts maybe hard to find in the future plus you save around $50-80 by replacing just bearing. The bearing itself may cost about $7
^ good point
Such an excellent video. I own a 2008 Cayman S the pulley system is surprisingly similar I have a rattle and was a little intimidated tackling the job itself, but now I have seen your video I am feeling a lot more confident. Thank you.
Awesome! I'm thrilled to hear that it helped you out. Good luck!
charlieaf92 thank you!!
The tension pulley bolt isn't 15/16th it's actually 24MM socket. Using a 15/16th should be fine but it's a little lose and could damage the nut/pulley.
Thanks for clarifying - that makes sense.
Great video even though I don't have a 911. I just pulled the alternator on my 01 Boxster and was wondering how to check the pulleys while I'm in there.
Excellent video....step by step
Good info thanks, well explained.
Great video!
You don't have to replace the bolt, but on the other hand you don't know how many times this bolt is reused. Long and thin bolts getting longer and thinner reusing it especially with 40 nm. This bolt is not only for the tensioner, it is also fixing the alternator in the aluminium engine block. When this bolt breaks you are in deep sh...t.
niceone thanks for the information its on point
As Brandon already stated it is not a 15/16th nut , as you can see on the rounded edges of the bolt from using the wrong tool. This is a European car , completely metric (no British or American threads and bolts or screws!) Also don't understand why you didn't exchange the long bolt and the belt doing this kind of work.
Thanks, I'll make a note in the description. I believe I did replace the belt but didn't mention it, or maybe I replaced it already or did at a later date. It's been so long I don't remember, but I'm certain I've purchased a new belt at one time or another. Regarding the long bolt, I didn't really see a reason to replace it. Typically I only replace bolts when they're damaged or specified as one time use like head bolts, flywheel bolts, etc.
My alternator pulley is doing what you mentioned. I turn the car off, and with the rear trunk open, I can hear it still spinning. I could not hear it with the trunk closed
Your hose is rubbing on the air box that is definitely not got long left just get a bit of rubber put on the outside of it or put a bit on the air box corners
Great video. Thank you.
Hello Charlie, nice video, great content, I have question for you and maybe you could help with this. I have a Mazda Tribute 2008 4 cyl. I lost the serpentine and noticed that the top pulley was loose, so I removed it and say that the washer behind it was damaged (it's for the power steering pulley) according to a diagram I found online. The pulley is still good, not damaged. Would you know where to get that washer part without having to change all the pulleys? Many thanks, John
Hey John. Sorry I don't know where to find one of those. I would recommend checking with a local auto parts store to see if they have the part. If its a simple washer, you could also take measurements and find one at a hardware store or order online.
Hi Charlie, thank you so much for the reply, yes maybe I could try to find one except is has like a indent in it so it's not flat, couldn't find anything that resemble it at Can Tire, I'll keep looking, keep up the good work.
very helpful many thanks
You're welcome! I'm glad it helped you.
Thanks really helpfull. 🤘
I’ve just replaced the rollers on my 911. They seemed to spin freely. But the noise is still there. I suspect it’s my alternator pulley too. Was this the case?
Try unplugging your secondary air pump and see if that fixes it. The bearings in those go bad as well and can cause a whine/squeal. The SAP only runs for a minute or two during a cold start, so if its a noise that goes away that is probably it.
Is this a 3.6 or 3.8. My car is 3.8 that has plastic pulleys.I just ordered 3 pulleys from autozone part #231173 that in the pictures look metal like yours. Will the metal ones fit with the old hardware--bolts and washers I have?
Mine is a 3.6. Honestly, I don't know the answer to your question. When you get your parts you can compare them. If you want to be absolutely sure, I'd get them from the dealer or from Pelican Parts using your VIN number to order them.
@@charlieaf92 Thanks.
Were you able to confirm torque settings for each of the rollers??
I believe I did, but I can't remember now. LN Engineering sells a great book with all of the torque specs listed. I don't have a copy myself, but its on my list of purchases to make.
Oops - I'll watch again. Thanks again for making the video.
@@ronvanr5359 I'm not sure I said it in the video to be honest. I'd recommend doing some searching on Rennlist or checking out LN's guide. Torque spec is important enough that I don't want to speculate and send you down the wrong path.
Great!
how many NM you closed the belt tensioner bolt?? Thanks
Sorry I can't remember exactly and I don't want to give you the wrong number. It would be best to check the factory service manual, or search Rennlist.
Awesome thanks for the tip. 👍🏼
Hello, my 997.2 has too much vibration at idle which gets worse when I turn on the A/C. Could it be the AC compressor clutch??
I'm not sure. But, I would guess not. When the compressor clutch engages, it puts more load on the engine - and if there is a problem with idling it would make it worse. So I think since its getting worse, that means the compressor is engaging properly. Are you getting any codes? When was the last time you replaced the spark plugs?
I bought the car 2 months ago and it has only 8000 miles, so I think the spark plugs have never been changed. I just put on two new 02 sensors but nothing happened. It is a 2011 Cabrio PDK. @@charlieaf92
ua-cam.com/video/MfJjnDqbwyY/v-deo.html@@charlieaf92
@@fdauhajre Is the check engine light on? I watched the video you posted - that isn't normal. I don't think that type of vibration is caused by a failing pulley - it is more like something out of balance or more likely a cylinder is not firing. This could be a bad coil pack or spark plug. Typically something like this would be noticed by the ECU and you'll get a check engine light, or at least a code. If you haven't already, signup at rennlist.com and check out the 997 forums.
Change serpentine belt for a Dodge Dakota 2005
My 986 Boxster is SO much easier to work on then the rear engine 996.
Really? I used to have a Pontiac Fiero (also mid-engine) and the gap caused by the rear trunk area made it hard to lean over and access things. The Fiero's engine was mounted sideways though. Wait... don't you have to access the belts from inside your car, climbing over seats?
charlieaf92 Hiya, I just replaced my serpentine belt and all pulleys from the inside of my boxster. I did have the seats removed because I replaced them with really nice leather ones. Even with the seats in its not a terrible job. Just slide the seats all the way forward and fold them forward to get the carpet panel out to then get the access panel out. Most German cars are designed to make work fairly straightforward. Also there is another panel above the engine as well giving you damn near 360 degree access. Makes classic 911s look masochistic in comparison. Also, when I was a kid my mother bought a 1988 Fiero Formula v6, my dad hated working on it, impossible to gain access to the engine without either special made tools or taking the subframe out to drop the engine. Fieros were a very neat attempt by Pontiac to make a unique two seat midengine sportscar. But until they had 6 cylinder engines installed in 88 they weren't very fast, case of too little too late. My mom's had the v6 and was actually a pretty serious little car. When I got my Boxster my wife and I went to visit my ma and I had her drive it and she thought it felt just like her fiero, shifted similar and drove very similar she said. But of course was a lot faster.
Awesome - good to know. I'll always have a soft spot for the Fiero, but I agree they're not very fast.
Oh, and go Buckeyes!