Has your 996 or 997 engine had a major rebuild?
Poll: Has your 996 or 997 engine had a major rebuild?
Total Members Polled: 867
Discussion
paul chocks said:
Auto versions of the 4wd 3.4 were known as Carrera 4 tiptronic S - frustratingly often the tiptronic is omitted in descriptions. Maybe it does say C4S on V5C, but it's not the same car as the wide body C4S that was badged as such.
yes sorry for the confusion as it's exactly what you e said 4wd3.4 tiptronic s so not as I described before. Can we convert to 3.6 and what would it involve parts ecu? Please
Any experts on here that could tell me how my car started with no rattling and knocking after breaking down to this?. As there' is no way the car would have started again in this condition and I didn't say anything to the garage who stripped it down.
Last time it was over hauled was because bottom end had bent the rods and seized???
Thanks
Last time it was over hauled was because bottom end had bent the rods and seized???
Thanks
micky1786 said:
No one seems to want to get involved but my brother has spoken to some really helpful people today and one being Grant at hartech so a big thank you for the advice you gave my brother 
Can only speak for myself but it's not a lack on interest, it's a lack of knowledge. No point me speculating so i'm glad you got solid advice... so what have hartech said? Any ideas?
MrJingles705 said:
Can only speak for myself but it's not a lack on interest, it's a lack of knowledge. No point me speculating so i'm glad you got solid advice...
so what have hartech said? Any ideas?
My brother didn't go into detail with me as we're currently sourcing a crank shaft crank case and other internal parts so he must have got some good advice as I personally know this engine can be repaired a lot cheaper than 5-10k and the parts from a few Models will work as long as we get the right ones PN. I think a nice man from Devon who stripped this car the last time round. £400 total to get the engine out and strip down to pieces.so what have hartech said? Any ideas?
He told us how to go about it if the IMS shaft is single chain or double chain which was also good news but we'll stick with what's in the car now and that's double chain as it'll be stronger imo.
I've also read that the rear main seal can leak very easily as it's prone vibration from the crank so spoken to my brother about the modified seal housing which apparently is bulletproof.
and wonder if anyone has done this. Also the IMS bearing upgrade for fail safe because if it were my car I'd have got it done as I'm anal when it comes to reliability and would like my car built like a 
Hey all,
As a former 996 3.4 owner I remain interested in wet sump reliability stats.
It seems to me that this topic was started with the intention of attempting to prove that failure rates are quite low. However the poll shows the opposite, and now it seems original posters are suggesting the poll is skewed.
Funny that!
It's worth noting that the official figures for IMS bearing failure on the US class action stats are within shouting distance of the polled stats for IMS failures on this topic.
I think (IMH) the over all percentage of failure rates shown here is therefore not a million miles off.
To those that say that owners with problems are more likely to log on here, I disagree.. pitonheads is possibly the most popular forum for car enthusiasts, whether their motor starts .. or not.
As a former 996 3.4 owner I remain interested in wet sump reliability stats.
It seems to me that this topic was started with the intention of attempting to prove that failure rates are quite low. However the poll shows the opposite, and now it seems original posters are suggesting the poll is skewed.
Funny that!
It's worth noting that the official figures for IMS bearing failure on the US class action stats are within shouting distance of the polled stats for IMS failures on this topic.
I think (IMH) the over all percentage of failure rates shown here is therefore not a million miles off.
To those that say that owners with problems are more likely to log on here, I disagree.. pitonheads is possibly the most popular forum for car enthusiasts, whether their motor starts .. or not.
IMS Bearing failure on my 54reg 997 3.8S at 51k miles. Also found light scoring on cylinders 4-6 when stripped down, (Very light as in could not feel the scoring with your finger and car did not use any excess oil etc). Decided to get it rebuilt properly. Had 6 new 100mm Hartech liners fitted to make it a 3.9L with 6 new Wossner pistons. Also fitted later IMS shaft with larger bearing and bearing outer seal removed. Still running it in now but its driving great.
IMS is a real issue on cars up to 2006. If you are running the original bearing there is a genuine risk of failure and you should get it replaced with something like the EPS roller bearing (I'm not a fan of the ceramic LN bearing). I thought I could just wait till my clutch needed replacing and change it then but that now turns out to have been a big and expensive mistake!!!
As for borescoring, yep it happens but it can be a very slow process, (not instant death like IMS failure). I found scoring in mine at 32k miles with a boroscope. However it did not have any symptoms (no high oil usage or sooty left exhaust etc). When the engine was stripped 20k miles later (which included 3 trackdays) the scoring was actually very minor and would not have been an issue for many thousands of miles or possible not an issue at all!
IMS is a real issue on cars up to 2006. If you are running the original bearing there is a genuine risk of failure and you should get it replaced with something like the EPS roller bearing (I'm not a fan of the ceramic LN bearing). I thought I could just wait till my clutch needed replacing and change it then but that now turns out to have been a big and expensive mistake!!!
As for borescoring, yep it happens but it can be a very slow process, (not instant death like IMS failure). I found scoring in mine at 32k miles with a boroscope. However it did not have any symptoms (no high oil usage or sooty left exhaust etc). When the engine was stripped 20k miles later (which included 3 trackdays) the scoring was actually very minor and would not have been an issue for many thousands of miles or possible not an issue at all!
krispe said:
IMS Bearing failure on my 54reg 997 3.8S at 51k miles. Also found light scoring on cylinders 4-6 when stripped down, (Very light as in could not feel the scoring with your finger and car did not use any excess oil etc). Decided to get it rebuilt properly. Had 6 new 100mm Hartech liners fitted to make it a 3.9L with 6 new Wossner pistons. Also fitted later IMS shaft with larger bearing and bearing outer seal removed. Still running it in now but its driving great.
IMS is a real issue on cars up to 2006. If you are running the original bearing there is a genuine risk of failure and you should get it replaced with something like the EPS roller bearing (I'm not a fan of the ceramic LN bearing). I thought I could just wait till my clutch needed replacing and change it then but that now turns out to have been a big and expensive mistake!!!
As for borescoring, yep it happens but it can be a very slow process, (not instant death like IMS failure). I found scoring in mine at 32k miles with a boroscope. However it did not have any symptoms (no high oil usage or sooty left exhaust etc). When the engine was stripped 20k miles later (which included 3 trackdays) the scoring was actually very minor and would not have been an issue for many thousands of miles or possible not an issue at all!
Sorry to hear that.IMS is a real issue on cars up to 2006. If you are running the original bearing there is a genuine risk of failure and you should get it replaced with something like the EPS roller bearing (I'm not a fan of the ceramic LN bearing). I thought I could just wait till my clutch needed replacing and change it then but that now turns out to have been a big and expensive mistake!!!
As for borescoring, yep it happens but it can be a very slow process, (not instant death like IMS failure). I found scoring in mine at 32k miles with a boroscope. However it did not have any symptoms (no high oil usage or sooty left exhaust etc). When the engine was stripped 20k miles later (which included 3 trackdays) the scoring was actually very minor and would not have been an issue for many thousands of miles or possible not an issue at all!
How much difference is the extra 100cc expected to make? Nice to come away with an upgrade after all that expense, even if it's a small one.
LordHaveMurci said:
Sorry to hear that.
How much difference is the extra 100cc expected to make? Nice to come away with an upgrade after all that expense, even if it's a small one.
Not sure how much difference the 100cc makes as still running it in at the moment. Should hit 1000miles next week, then another oil change and I'll give it the full beans! Car also has equal length manifolds, 200cel cats and different back box, BMC filter, RSS underdrive pulley fitted. I also had the crank, pistons, rods, clutch and flywheel all balanced whilst the engine was apart. Once run in I'll fit a GT3 83mm throttle body and get a live remap done by DMS, The extra 100cc didn't cost much more and as you say it was nice to have an upgrade ,(albeit a relatively small one) after all that expense. I'm crossing all my fingers and toes that when finished and remapped it will hit 400hp ?? How much difference is the extra 100cc expected to make? Nice to come away with an upgrade after all that expense, even if it's a small one.
(Or at least match an x51 car at >385hp)krispe said:
Not sure how much difference the 100cc makes as still running it in at the moment. Should hit 1000miles next week, then another oil change and I'll give it the full beans! Car also has equal length manifolds, 200cel cats and different back box, BMC filter, RSS underdrive pulley fitted. I also had the crank, pistons, rods, clutch and flywheel all balanced whilst the engine was apart. Once run in I'll fit a GT3 83mm throttle body and get a live remap done by DMS, The extra 100cc didn't cost much more and as you say it was nice to have an upgrade ,(albeit a relatively small one) after all that expense. I'm crossing all my fingers and toes that when finished and remapped it will hit 400hp ?? (Or at least match an x51 car at >385hp)
Nice spec car, Krispe. My 3.4 is about to have an engine rebuild at Hartech with new liners, rings, crank bearings, IMS bearing etc. What running in procedure do Hartech recommend? Keeps the revs down for the first 1k miles, then change the oil and you're good to go? (Or at least match an x51 car at >385hp)Recently bought a 1998 3.4 Manual 996
About a year ago previous owner replaced cam chains, tensioners and water pump ( not from failure but for future proofing ) also replaced IMS bearing with EPS unit.
No record of any engine changes or rebuilds.
No oil used after 400 miles
Mileage is at 118000
About a year ago previous owner replaced cam chains, tensioners and water pump ( not from failure but for future proofing ) also replaced IMS bearing with EPS unit.
No record of any engine changes or rebuilds.
No oil used after 400 miles
Mileage is at 118000
Gassing Station | 911/Carrera GT | Top of Page | What's New | My Stuff