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THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHWhat did they change after the factory fire?
Leading reported evidence
Use lokasil liners (except the gts and turbos
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
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Performed · outcome unconfirmed
All 996s used Lokasil liners (except the GTs and Turbos which used Nikasil).
Leading evidence: 'Use lokasil liners (except the gts and turbos' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Adjust oil you' (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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Performed · outcome unconfirmed
They used a metal matrix composite dry sleeve with a top hat on it for the repair, but unfortunately made a critical mistake in the machining.
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Performed · outcome unconfirmed
All 996s used Lokasil liners (except the GTs and Turbos which used Nikasil).
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
If your bores are showing scoring, you can adjust the oil you use.
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Discussions that contain suggestions
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Suggestion
I have replaced many in Boxsters for this, but not in 996's ( maybe Jake has seen some in 996's and can elaborate on this).
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Suggestion
Just get a borescope, drop your pan, see if you got anything sitting their, tear apart your oil filter and give it a look, test your oil every so often to see what may be showing up, make sure you have relatively new fuel injectors, MAF and OXY sensors, change your oil no less than 2x a year, and run good fuel.
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
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Suggestion
Just get a borescope, drop your pan, see if you got anything sitting their, tear apart your oil filter and give it a look, test your oil every so often to see what may be showing up, make sure you have relatively new fuel injectors, MAF and OXY sensors, change your oil no less than 2x a year, and run good fuel.
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.
Suggestion
Just get a borescope, drop your pan, see if you got anything sitting their, tear apart your oil filter and give it a look, test your oil every so often to see what may be showing up, make sure you have relatively new fuel injectors, MAF and OXY sensors, change your oil no less than 2x a year, and run good fuel.
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5 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Rennlist: 1 discussions
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Was just reading a ton about bore scoring, IMS issues, etc... All these things that people rave about on here, despite most of these issues only effecting a relatively small percentage of cars in the grand scheme of things.
Found this article:
https://www.rpmspecialistcars.co.uk/...-bore-scoring/
One thing I noticed is the crankcases use - quote -
‘Lokasil’ Cylinder liners (a flexible but hard-surface metal matrix composite). I can almost swear I read somewhere that very early build 996's (I guess pre "fire") did
not
use this liner in their crankcases. Fact or not?
Also, it seems my understanding of bore scoring is incorrect, though I think parts of this article may be incorrect....? I thought bore scoring happened because the cylinder wall can oval out (due to heat), creating less room for the piston/piston head to flow about smoothly. I don't think the article's explanation backs that up....? Later on though, it does talk about the oil becoming diluted - in which case, a big help to prevention of bore scoring would technically involve cleaning out the aerators in the sump pan.... no? And obviously, ensuring the cooling system is good to go, because of heat, especially with these liners.....
Idk, just bs'ing.
Lot of things that can cause bore scoring. Go to YuTube and subscribe to rennvision. Jake and crew give you plenty of info and tips. Go to LN engineering website and they have an entire library of topics.
Plenty of threads here on RL. Just search the topic. Inho, it's fairly easy to prevent. But if you have a car that the previous owners did not do the right things to prevent it, you may have a problem brewing that you don't know about until you get your bores scoped.
You don't need to fear it. Just get a borescope, drop your pan, see if you got anything sitting their, tear apart your oil filter and give it a look, test your oil every so often to see what may be showing up, make sure you have relatively new fuel injectors, MAF and OXY sensors, change your oil no less than 2x a year, and run good fuel.
If your bores are showing scoring, you can adjust the oil you use. All info is on RL, Rennvision and LN.
my recollection is that post-fire, Porsche reworked a bunch of previously failed blocks to keep the production line moving. All 996s used Lokasil liners (except the GTs and Turbos which used Nikasil). The 3.6 & 3.8 had thinner walls than the 3.4 which saw greater effects from heat cycles.
Here is my understanding of what happened due to the factory fire. This explantion came from Porsche Training Instructor who received his training from going to Stuttgart for training, So this info is once removed from the Porsche Stuttgart Training that PNA Instructors receive and then pass on to PCNA Techicians.
The fire occurred in the Factory Engine Plant ( Kolbenschmit ) , the casting machines were moved to another location then re-set up. After moving the casting machines there were some Quality Control issues with the cases.Many were deemed as unfit for use. The issues with the casting machines were fixed, but by this time after the move and re-set the production was very far behind and the decision was made to repair some of the QC discarded blocks by a sleeving process to catch up on production. They used a metal matrix composite dry sleeve with a top hat on it for the repair, but unfortunately made a critical mistake in the machining. ( probsably due to being in a rush to catch up with demand). The sleeve had a corner where the top hat met the outer circumference that had a slight radius whereas the matching machining in the case bore did not. This created a high stress point that after was put in service would crack around the top hat and the top hat would crumble into the cylinder or the sleeve would slip down and hit the crankshaft.
Most if not all of these "sleeved motors" were used in Boxsters, AFAIK they were not used in 996's. I have replaced many in Boxsters for this, but not in 996's ( maybe Jake has seen some in 996's and can elaborate on this). Most all these have failed by now if they have over 30k miles BUT BEWARE of an early engine number that has been a Garage Queen and has less than 30K miles !!!
