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YOUR RESEARCHBore scoring? No oil consumption, no smoke at start up.
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Install on bank 1-3
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Performed · outcome unconfirmed · Original poster
The funny thing is that it sounded like the ticking was coming from bank 4-6 (passenger side), yet the pump was improperly installed on bank 1-3.
Bore scoring? No oil consumption, no smoke at start up.
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Leading evidence: 'Install on bank 1-3' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Install on bank 1-3' (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
I have seen this exact thing 4 times in the last 6 months, with 3 being no damage, just noisy lifters, but one where it went back to the shop who did the work, and they still didn't find the problem, then shortly after it spun a rod bearing and threw a rod through the case, total destruction...found the incorrectly installed scavenge pump in the autopsy..
Bore scoring? No oil consumption, no smoke at start up.
Install scavenger pump
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Bore scoring? No oil consumption, no smoke at start up.
Install scavenging pumps wrong
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
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Performed · outcome unconfirmed
Last shop to work on it had installed the scavenging pumps wrong.
Bore scoring? No oil consumption, no smoke at start up.
Install scavenge pump in the autopsy
No successful repair reported for this finding.
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Performed · outcome unconfirmed
I have seen this exact thing 4 times in the last 6 months, with 3 being no damage, just noisy lifters, but one where it went back to the shop who did the work, and they still didn't find the problem, then shortly after it spun a rod bearing and threw a rod through the case, total destruction...found the incorrectly installed scavenge pump in the autopsy..
Bore scoring? No oil consumption, no smoke at start up.
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Can anyone tell if this is bore scoring by the sound? Please help! Apparently, there was a new engine put in 11 years ago and that engine now has 60k miles. No smoke on start ups. Does not use ANY oil. No abnormal tailpipe soot� what is going on?!
1999 Carrera 4. 118k miles, 60k miles on engine. Sound occurs only when warm, never when cold. When it is warm and making the ticking sound the sound will go away if I let it idle for a couple minutes. Idk. I just bought this and really have enjoyed the hell out of it so far! �I thought I could get lucky on an old 996. Maybe time for a 997.2 so I can sleep at night!
I tried adding attachment and made sure to cut the video below 20MB. Not working for some reason. Here is the YouTube link:
https://youtube.com/shorts/F3y3th2Oq...VjIOLTBGqcwgZI
You cannot diagnose bore scoring with an audio clip but that ticking sound is not good � very similar to what is often misdiagnosed as a stuck lifter when it�s actually bore scoring. It would also be helpful to get an oil analysis.
Before I tore mine down, I would get a ticking like that if I let the car sit and not drive it much. It would eventually go away. No oil use and no smoking or soot on the tail pipes.
When I tore down the engine (97k, 3.6l) I did not have any scoring. However, the skirt coating was wearing and some had flaked off. What I did find was a bad exhaust lifter in #6.
All that said, you need to scope the cylinders to be sure.
Dan
Oil consumption yes, but not extreme. Very little smoke at start up. Would get some spitting from drivers side on some start ups. Drivers side exhaust was more sooty than passenger side. Mine ended up very bad over a period of years.
Could be bore scoring, but also could be a loose spark plug, an exhaust leak, carbon buildup, a blocked oil passage where the lifter is, a valve issue, etc.
Take a look underneath, and just to be sure, do a quick check that your scavenging pumps are oriented properly.
I had a similar ticking to whats in your audio clip, accompanied by low oil pressure (~3bar warm), no smoke, no oil usage. Last shop to work on it had installed the scavenging pumps wrong. Should have done a PPI.
Probably not your issue, but its easy to eliminate.
Ouch, my worst fear. That�s a total bummer. So you got years out of driving from when it started first ticking? I am thinking of just letting it go from my mind and just driving the **** out of it until it won�t drive anymore. No more worries, just drive it and forget about it? Maybe I don�t want to find out, ignorance is bliss sometimes.
Yes bought in 2014 and drove it(in total denial of the truth) until it started throwing misfire codes late 2018(#6 spark plug bridged by oil/carbon deposits). Bore scope from plug hole showed the root cause above.
Jake Raby fixed the issue for me Sept 2019!
Holy sh*t, you were right. Thank you for chiming in! I was getting <3bar oil pressure at operating temp and above 3k RPM. Checked underneath like you said� scavenging pump at back of engine (front of car and driver�s side bank) has the notch in the down position. It should be in the up position, as I understand. First pic attached of this pump.
Also of note, the scavenging pump at front of engine (rear of car, passenger side bank) ends in part number 54 (second pic attached). The orientation is correct with notch down, as I understand, but should it end in part number 55? Maybe they are interchangeable? The misaligned rear of engine pump is also part number 54.
Wow, I love this place and this was my first post ever!
Scavenging pump at rear of engine.
Scavenging pump at front of engine.
I wasn't able to get a good picture of the left bank 1-3 pump, but I got a decent picture of the right side bank 4-6 pump.
You want the rear pump to have the 4-6 on the inside, and the front pump should have the 1-3 towards the inside.
I think your rear(passenger side) pump is correct, and your front(drivers side) pump is on wrong.
Just have to remove the bolts and rotate it 180*.
Sorry about my oil coated engine...
I think
@Eggy996
is correct. If I see the pics correctly the bank 1 (cyl1-3, drivers side) is in wrong. Have the heads been rebuilt? I see the anti tamper coins glued to each pump.
There are overheat indicator tabs in those photos. Wax center melts out if overheated. Definitely not original. I'm guessing the cylinder head or engine was rebuilt at some point as there would be little other reason for those to be put on there. We put those on the blocks after they have been sleeved with Nickies. Cylinder head rebuilders often use them as well, but I'll be honest, I've never seen one fitted to a scavenge pump :-)
UPDATE:
The ticking noise has been resolved. It WAS an improperly installed scavenger pump. I correctly orientated the pump (bank 1-3) and MAGIC, the noise 100% is gone.
Big thanks to Eggy996 and to everyone else that has chimed in. I'm so thankful for you all.
*Eggy996 please dm me your Venmo or PayPal account if you have one and I'd like to send you a $100. It's not much but boy did this save me massive $$. And gave me back the ability to enjoy my car again. Thank you.
Interesting! I thought they were a little odd as well. When the previous owner said that a new engine was installed in 2012, maybe it was rebuilt instead. I wish I had paperwork on the engine; that would be an amazing bonus to find it had been re-sleeved with nikasil cylinders. Are there any other markers that could give me an indication? Is it common to find a stamp or placard somewhere on the engine if rebuilt by a reputable builder?
The engine has been amazing since rotating the bank 1-3 pump, the noise has completely disappeared. Amazing car.
Awesome news. As far as the dm goes, glad to help, lets just say drinks are on you should we cross paths.
Its not the pump itself making noise I don't think, I believe its the lifters that are ticking, which makes it easy to confuse with piston slap/bore scoring.
Good question. Hopefully someone with more knowledge can answer. The funny thing is that it sounded like the ticking was coming from bank 4-6 (passenger side), yet the pump was improperly installed on bank 1-3.
You got it sir! Thank you again. Could not be more happy with this car (coming from someone who just sold his 991.1 GTS).
So if it�s the lifters, is it due to lack of lubrication? And are there any long term consequences to operating in this condition for thousands of miles?
When one of the scavenge pumps are installed wrong ( or both) it lowers the oil level in the Sump since the oil cannot return from the heads while running.. This lowered oil level will allow a vortex to form at the oil pick-up tube due to low oil level with high velocity..
The Vortex will allow air to enter the oiling system and when the air reaches the lifters and displaces the oil that it needs in the lifters they will begin to click/clack..
I have seen this exact thing 4 times in the last 6 months, with 3 being no damage, just noisy lifters, but one where it went back to the shop who did the work, and they still didn't find the problem, then shortly after it spun a rod bearing and threw a rod through the case, total destruction...found the incorrectly installed scavenge pump in the autopsy..
Op, you are very lucky to have dodged this bullet...Since Eggy declined the $100, I suggest you go buy $100 worth of Lottery tickets and if you HIT , give Eggy 1/2..lol
