Looks like I have a bad valve lifter...
#31
John,
These are the correct part numbers per my invoice just for verification (Thanks winnigt2). The lifter issue came up a few years ago when I lived/ate and breathed on the forums so I was aware of it before my build, just as Dennis said, they fell apart in Todds hands when dissembled. The good news is they didn't fail during my infamous 7000rpm runs :-)
Good thing you caught this early, our group has done well to not have many on road catastrophic failures (knocks on wood)
These are the correct part numbers per my invoice just for verification (Thanks winnigt2). The lifter issue came up a few years ago when I lived/ate and breathed on the forums so I was aware of it before my build, just as Dennis said, they fell apart in Todds hands when dissembled. The good news is they didn't fail during my infamous 7000rpm runs :-)
Good thing you caught this early, our group has done well to not have many on road catastrophic failures (knocks on wood)
Thanks for chiming in. When I started researching this last week I read your post where you listed the part numbers and one of the one you listed (ending in 73) did not come as as the correct number as Porsche had it listed as a GT3 part. When winniGT2 listed the part numbers they were the same except one of them ended in 72 which does come up as a correct Gt2/996tt number. If I understand you correctly you had the "72" part number put in as opposed to the "73" you initially listed last year. I will verify tomorrow that is what is going in. Even though it sucks that this manifested itself I'm going to be glad to have the updated parts in the motor. Evidently it doesn't take much for the lifter to start ticking. It's not that the lifter is necessarily fully stuck but rather that it doesn't have it's full range of motion there by creating a gap which in turn causes the ticking sound. At least that's the way I understand it....
Last edited by pwdrhound; 09-03-2012 at 10:29 AM.
#32
I'm going to do a separate write up on the cooler with pictures shortly. Stay tuned....
#34
So I find this thread very interesting as I had recently replied to another thread questioning the use of "Sea Foam". I didn't go into detail why I gave it a try. However, it was for a "ticking" we could not resolve. I had a light ticking coming from the lifters (1998, 993CS2, 120,000 miles). We replaced the lifters and the ticking was now even louder. After my mechanic tried a few other ideas/options...still no resolve. While driving the car the ticking would come and go. Sometimes at start-up, sometimes after longer drives, and idling. It was inconsistent, but it would occur more than not.
Think I heard about Sea Foam on one of those late night car shows on SPEED, like Gearz or Two Guys....???? Not too sure, but I added a can and with 30 miles or so of driving the ticking went a way and never came back!
Think I heard about Sea Foam on one of those late night car shows on SPEED, like Gearz or Two Guys....???? Not too sure, but I added a can and with 30 miles or so of driving the ticking went a way and never came back!
#35
intake lifters are the main problem.....outlet lifter do not fail but the renew is to recommend too
and its not a real common problem.... not every 996tt will have this failure in the future
this engine is not easy to analyse with his noises ...under 2000rpm it is a little orchestra from a race engine in it
before you open it be shure what it is....oilfilter check...noise analyse from a good repair shop...
to add a good additive is sometimes the first cheap try.....
and its not a real common problem.... not every 996tt will have this failure in the future
this engine is not easy to analyse with his noises ...under 2000rpm it is a little orchestra from a race engine in it
before you open it be shure what it is....oilfilter check...noise analyse from a good repair shop...
to add a good additive is sometimes the first cheap try.....
Last edited by winnigt2; 09-03-2012 at 01:23 PM.
#36
ok but other than that as i understand most of the time is for pulling and putting back the engine in but do you need to take the heads off or can it be done with only taking the valve covers off?
#38
11 hrs R&I of motor. 2.5 hrs per each side of motor to swap the lifters. Heads do not need to come off, camshafts do.
#39
These guys are hot John! 11 hours to remove and install an engine on a 996 turbo, this is very very good! A good part of your misfortune is that you are dealing with a good shop!
#40
that is good, John, you need to tell me who that is?
#41
Ok, so the cam covers are off and camshafts are coming out next. Just as my mechanic told me, it is the #3 cylinder on the drivers side. Specifically one of the hydraulic exhaust lifters is bad. You can press on it and it collapses fairly easily so it looks like the internal spring is bad. Everything visible including the cam lobes look to be in perfect shape so that's a relief. Now they just need to pull the right side and swap out all 24 lifters and assembly can begin. Should be wrapped up in another couple of days.
#42
Ok, so the cam covers are off and camshafts are coming out next. Just as my mechanic told me, it is the #3 cylinder on the drivers side. Specifically one of the hydraulic exhaust lifters is bad. You can press on it and it collapses fairly easily so it looks like the internal spring is bad. Everything visible including the cam lobes look to be in perfect shape so that's a relief. Now they just need to pull the right side and swap out all 24 lifters and assembly can begin. Should be wrapped up in another couple of days.
John, I have heard sticking lifters in american cars often, and it can be loud when you pop the hood. Is the sticking lifter in these cars very noticeable even over loud exhaust and LWFW? Also did you get pics of the overall car and area as they do the work? I'd love to see that.
#43
Ok, so the cam covers are off and camshafts are coming out next. Just as my mechanic told me, it is the #3 cylinder on the drivers side. Specifically one of the hydraulic exhaust lifters is bad. You can press on it and it collapses fairly easily so it looks like the internal spring is bad. Everything visible including the cam lobes look to be in perfect shape so that's a relief. Now they just need to pull the right side and swap out all 24 lifters and assembly can begin. Should be wrapped up in another couple of days.
maybe the reason is a def exhaust valve or spring
Last edited by winnigt2; 09-07-2012 at 08:17 AM.
#44
Thanks for keeping us up to date John. After reading previous post from Sharkster (https://www.6speedonline.com/forums/...e-engines.html) I was wondering if there is a possibility, while the engine is on the ground , to check looseness of the intermediate shaft?
#45
John, I have heard sticking lifters in american cars often, and it can be loud when you pop the hood. Is the sticking lifter in these cars very noticeable even over loud exhaust and LWFW? Also did you get pics of the overall car and area as they do the work? I'd love to see that.