Coastr Posted 20December, 2012 Report Share Posted 20December, 2012 Has anyone got a cutaway technical diagram of a 996 engine? I see a lot of talk about IMS bearings but I must confess I don't know what it is, where it is or what an intermediate shaft does. Link to comment Share on other sites More sharing options...
Whipit Posted 21December, 2012 Report Share Posted 21December, 2012 Can I please note : MY CAR DID NOT HAVE AN IMS FAILURE read post 87 At the time I thought it had as I thought this was the only known shortcoming of these cars, how wrong I was. The oil pump seized , which then snapped the timing chain, which in turn damages the teeth of the sprocket on the end of the IMS shaft, which requires total engine disassembly to replace, and of course bent the valves on that bank to boot. It has cost me $15,000 to repair. I run a mechanical engineering business, I am sorry there is no way the balls in a bearing will brinel a hardened race simply whilst stationary. And Ten Degrees, I would not trust anything you have been told about what does or doesn't cause IMS failure unless its by an independent Porsche mechanic. I mean now supposedly driving too few kilometres can be a problem, so we are now searching for a car with mileage that is not too low, and not too high, which has been driven hard but not too hard, that's been serviced regularly but not too regularly. Maybe the 996 should be called the Goldilocks Porsche, not too hard, not too soft, it has to be juuuussst right. Link to comment Share on other sites More sharing options...
Babalouie Posted 21December, 2012 Report Share Posted 21December, 2012 IMS means intermediate shaft (which for the record did not fail in Whipits car) It's a jack shaft that lives under & parallel to the crankshaft. It's driven by a chain off the crank, and the other end of the shaft drives the cam chains. This by itself is no biggie, the old air cooled motors have an IMS too, but the issue is that one end of the IMS is supported not by a conventional pressure fed oiled bearing (like the cams, crank or rods) but by what looks an awful lot like a wheel bearing. The bearing poos itself and that causes the haft to go out of whack, cams to go out of time, and pistons to hit valves. Big fat kaboom, accompanied by heaps of dead bits of IMS bearing coursing all over the engine like bits of sandpaper, so even the parts that don't go kaboom get munted. But it's not what happened I Whipits motor, that's the oil pump shaft failure Has anyone got a cutaway technical diagram of a 996 engine? I see a lot of talk about IMS bearings but I must confess I don't know what it is, where it is or what an intermediate shaft does. Link to comment Share on other sites More sharing options...
wasserkuhl Posted 21December, 2012 Report Share Posted 21December, 2012 Yea Marks doing the work, I bought it privately from NSW, full service history, spoke to the dealer at length, 16k on the clock, literally was show room condition. probably doesn't come across like it but I truly am trying to remain philosophical about it all. I am glad Mark has done the work. there are some specialists in adelaide that would ruin your experience even further... You are holding up well, I'd be very dark about it.........have you thought about selling it? Link to comment Share on other sites More sharing options...
withers Posted 14January, 2013 Report Share Posted 14January, 2013 Hey WhipIt.. I was wondering how your car was coming along? Are you going to keep it or sell it? Link to comment Share on other sites More sharing options...
Jimmy Posted 18January, 2013 Report Share Posted 18January, 2013 Hey WhipIt.. I was wondering how your car was coming along? Are you going to keep it or sell it? I am guessing he might have it up for sale and keeping a low profile on here and does not not want to attract too much negative attention. Link to comment Share on other sites More sharing options...
T-Man Posted 19January, 2013 Report Share Posted 19January, 2013 I am guessing he might have it up for sale and keeping a low profile on here and does not not want to attract too much negative attention. Shame to sell considering how much he enjoyed it in the earlier stage of ownership. I was looking forward to the next episode in Porsche bashing!!! Link to comment Share on other sites More sharing options...
wasserkuhl Posted 20January, 2013 Report Share Posted 20January, 2013 Don't blame him really. Its a lot of wonga to spend on a car and for it to fail so dramatically. Sigh. Link to comment Share on other sites More sharing options...
withers Posted 20January, 2013 Report Share Posted 20January, 2013 I agree and I really feel for him. You can't discount ones feelings.... I hope he bounces back and finds another awesome car that he loves. Link to comment Share on other sites More sharing options...
Whipit Posted 22January, 2013 Report Share Posted 22January, 2013 Hello fellow Porsche devotees. No I haven't gone away for good, to be very truthful I have the car back and have been enjoying driving it whilst trying not to think too much about the problems I have had. All up, $15,703 to repair. Anyway you cut it, that hurts. Now to be fair, some of that I didn't have to do. If I were to be a #$% about it, I would have done the absolute minimum needed and then sold it off straight away and made it someone else's problem. But the big problem for me is that I actually love the car. It took me a long time to find it, it has lots of little bits and pieces (mainly aesthetic) which make it a little unique, and I think makes it one of the best looking cab's going around. So instead I did the rings, bearings, both heads etc so its as good (hopefully better) than new. Yes some of the magic has gone, I have done a little over 1000k's since the rebuild, I have to Mark and his team have done a great job, it runs and drives perfectly. But of course I still haven't given it its head yet, and am a bit nervous too after what's happened. As for "Porsche Bashing", well I really truly do think we have been deceived, at least with the 996. In the end the Porsche is a great car, no doubt about it, but it really is just another mass produced car, albeit a nice one. I run an engineering business, and I have to say the whole design of the IMS, not just the bearing is poor. I mean to make a shaft one piece, sandwiched between two halves of the crank case, that can not be removed for any reason without splitting the engine is just bloody dumb. If I could be bothered I would design an after market replacement, no doubt someone will someday. (Porsche should). Well, I will sign off for now, the sun is shining, I think I may go for a nice cruise with the roof down, just a bit slower than I used too... Link to comment Share on other sites More sharing options...
Uncle Posted 22January, 2013 Report Share Posted 22January, 2013 Glad you go tit back on the road Whipit. Some of the gloss may have worn off the car but it sounds like you are still enjoying your time with the car. Link to comment Share on other sites More sharing options...
Chris-p Posted 22January, 2013 Report Share Posted 22January, 2013 Hi Gary, Very glad you have the car back and are getting to love it again. I think we can all understand both your trepidation and also your joy at being able to enjoy it again. It's a lovely car from the pics I saw of it when you first got it. The fact that you went that extra mile with the rebuild will hopefully mean you have many years of enjoyment in front of you and I look forward to hearing all about it...... Enjoy it! Very best wishes Chris Link to comment Share on other sites More sharing options...
oz951 Posted 22January, 2013 Report Share Posted 22January, 2013 Hi Gary, it was a bitter pill to swallow but it sounds like the underlying attraction to the car is still there. I hope that it wont be too long before your fully back to enjoying everything that the car has to offer and enjoying the fact that you have addressed the issues. All the best. Wayne Link to comment Share on other sites More sharing options...
T-Man Posted 22January, 2013 Report Share Posted 22January, 2013 Great stuff. Good to see you are still in the brand and still smiling!!!! Link to comment Share on other sites More sharing options...
withers Posted 22January, 2013 Report Share Posted 22January, 2013 Like the guys above me have said, great to see you still have the car. Here's hoping you fall back in love and the confidence in the car comes back! Drive it like you stole it Whip It Link to comment Share on other sites More sharing options...
Whipit Posted 15February, 2013 Report Share Posted 15February, 2013 Well, bit of an update, have done just over 2,000 k's since the rebuild. Had Mark do an oil change for me just to be on the safe side. Last night I took Amanda's advice and drove it like I stole it Well not really but I did open her up, have to say if anything its better than it was before. Still haven't totally got my confidence back but I have become a little more philosophical about the whole affair. Anyhow, hard to be grumpy when your pulling 7,000 rpm in a 911 with the roof down ha ha. Link to comment Share on other sites More sharing options...
Chris-p Posted 15February, 2013 Report Share Posted 15February, 2013 That's a great post to read Gary. you just made my day. Enjoy it...... C Link to comment Share on other sites More sharing options...
Jimmy Posted 15February, 2013 Report Share Posted 15February, 2013 That's a great post to read Gary. you just made my day. Enjoy it...... C + 1 Link to comment Share on other sites More sharing options...
Niko Posted 15February, 2013 Report Share Posted 15February, 2013 Well, bit of an update, have done just over 2,000 k's since the rebuild. Had Mark do an oil change for me just to be on the safe side. Last night I took Amanda's advice and drove it like I stole it Well not really but I did open her up, have to say if anything its better than it was before. Still haven't totally got my confidence back but I have become a little more philosophical about the whole affair. Anyhow, hard to be grumpy when your pulling 7,000 rpm in a 911 with the roof down ha ha.Great news Whipit, welcome back. Link to comment Share on other sites More sharing options...
withers Posted 15February, 2013 Report Share Posted 15February, 2013 Yay someone listened to me that is great news Whip It! Link to comment Share on other sites More sharing options...
tazzieman Posted 15February, 2013 Report Share Posted 15February, 2013 Gotta love the ol' Devo band. For those who want to avoid problems (more the IMS bearing than the oil pump meltdown of our unlucky colleague) "Try to detect it - It's not too late". Anyway it sounds like the man's whipping it good now , which IMO is the proper way to treat a 911. Have a great weekend! Crack that whip Give the past a slip Step on a crack Break your momma's back When a problem comes along You must whip it Before the cream sets out too long You must whip it When something's goin' wrong You must whip it Now whip it Into shape Shape it up Get straight Go forward Move ahead Try to detect it It's not too late To whip it Whip it good When a good time turns around You must whip it You will never live it down Unless you whip it No one gets away Until they whip it I say whip it Whip it good Link to comment Share on other sites More sharing options...
AndyS Posted 15February, 2013 Report Share Posted 15February, 2013 Also really pleased to read this one Gary. Glad you still have a real sense of enjoyment when driving your car. We're with you 100% and hope you continue to enjoy it for a long time yet. Andy S Link to comment Share on other sites More sharing options...
tazzieman Posted 15February, 2013 Report Share Posted 15February, 2013 so we are now searching for a car with mileage that is not too low, and not too high, which has been driven hard but not too hard, that's been serviced regularly but not too regularly. Maybe the 996 should be called the Goldilocks Porsche, not too hard, not too soft, it has to be juuuussst right. Therein lies the rub of car ownership Unless your car is certified collectable , there is simply no point in underusing it. Changing the oil regularly is the best thing you can do. Driving the p out of it is what it was engineered for. Bring on the redline, same goes for humans but that's another off topic topic , dear to my heart. Anyway my dear old 924 is called Goldlocks so you'll have to come up with another term! Link to comment Share on other sites More sharing options...
oz951 Posted 15February, 2013 Report Share Posted 15February, 2013 Good on you Whipit. Glad to hear your perseverance is being rewarded. Link to comment Share on other sites More sharing options...
VinnieChase Posted 14March, 2013 Report Share Posted 14March, 2013 Does Porsche specialist like Autohaus offer solutions that can prevent 996/997 IMS and RMS issues? Link to comment Share on other sites More sharing options...
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