Engine knocking...
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Joined: Aug 2009
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From: Houston, Texas, USA
Engine knocking...
But no one's home. Sorry. I couldn't resist.
My 02 996 C2 has been sitting for a few days (been driving the F150 while remodeling). I went to start it and when it did it made a horrible clattering noise. I killed it immediately and sat there wondering if the IMS bearing had just died (no pun intended). Having worked as a mechanic in my youth (long enough to decide I didn't want to do that for a living) I decided it sounded more like a valve clattering noise similar to a stuck lifter and after checking the oil level gambled on a restart. This time it started without the clatter but it had a definite metallic knock like a rod bearing.
I dug out my 24 mo/24k aftermarket warranty paperwork and found I have approximately 3k miles till it expires. Whew!
So I had it towed to the dealer and am anxiously awaiting a call. I guess if something is going to break, better now than in 3k miles. I've been out of work since June and the oil and gas industry doesn't look to improve before next summer. I certainly can't afford a huge repair bill right now. I just hope the warranty doesn't try to weasle out of any repairs. They were great with the last repair - a failed cam actuator - but one never knows.
My 02 996 C2 has been sitting for a few days (been driving the F150 while remodeling). I went to start it and when it did it made a horrible clattering noise. I killed it immediately and sat there wondering if the IMS bearing had just died (no pun intended). Having worked as a mechanic in my youth (long enough to decide I didn't want to do that for a living) I decided it sounded more like a valve clattering noise similar to a stuck lifter and after checking the oil level gambled on a restart. This time it started without the clatter but it had a definite metallic knock like a rod bearing.
I dug out my 24 mo/24k aftermarket warranty paperwork and found I have approximately 3k miles till it expires. Whew!
So I had it towed to the dealer and am anxiously awaiting a call. I guess if something is going to break, better now than in 3k miles. I've been out of work since June and the oil and gas industry doesn't look to improve before next summer. I certainly can't afford a huge repair bill right now. I just hope the warranty doesn't try to weasle out of any repairs. They were great with the last repair - a failed cam actuator - but one never knows.
Parts Specialist
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did you listen to this thread?
https://rennlist.com/forums/996-foru...ound-clip.html
also could be other things, lifters get stuck/bleed down, cam chain tensioners stick and bleed down, and pulley bearing make noise - lets hope its something simple (or covered)
https://rennlist.com/forums/996-foru...ound-clip.html
also could be other things, lifters get stuck/bleed down, cam chain tensioners stick and bleed down, and pulley bearing make noise - lets hope its something simple (or covered)
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Joined: Feb 2010
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From: So.CA
1st guess is a lifter, same stuff in the oil that can clog a vario-can actuator can clog lifters too. Hopefully you can get a "upgrade" out of this. If it's a lifter or 2 it would be good to remove all the lifters, submerge them in new engine oil (while keeping track of where they go backh in the head in the same place they came from) and pump the lifter until all the old oil gets purged with clean oil.
But you have to see what they want to do.
But you have to see what they want to do.
Drifting
Joined: Dec 2009
Posts: 2,919
Likes: 3
From: Aiea, HI
Uh oh. Horrible clattering is what santa's sleigh is supposed to do on the roof instead of in your engine. Hopefully rod bearings are covered.
Make sure you don't do any reving the engine when its cold. It's the best way to turn a bearing in this world.
Make sure you don't do any reving the engine when its cold. It's the best way to turn a bearing in this world.
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lifters sticking is not always curable with "new oil"
the variocam plus motors center section of the lifter can mushroom to the point of sticking a little, them permenantly - wanna see the pics (again)
the variocam plus motors center section of the lifter can mushroom to the point of sticking a little, them permenantly - wanna see the pics (again)
Thread Starter
Pro
Joined: Aug 2009
Posts: 590
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From: Houston, Texas, USA
did you listen to this thread?
https://rennlist.com/forums/996-foru...ound-clip.html
also could be other things, lifters get stuck/bleed down, cam chain tensioners stick and bleed down, and pulley bearing make noise - lets hope its something simple (or covered)
https://rennlist.com/forums/996-foru...ound-clip.html
also could be other things, lifters get stuck/bleed down, cam chain tensioners stick and bleed down, and pulley bearing make noise - lets hope its something simple (or covered)
Thread Starter
Pro
Joined: Aug 2009
Posts: 590
Likes: 4
From: Houston, Texas, USA
1st guess is a lifter, same stuff in the oil that can clog a vario-can actuator can clog lifters too. Hopefully you can get a "upgrade" out of this. If it's a lifter or 2 it would be good to remove all the lifters, submerge them in new engine oil (while keeping track of where they go backh in the head in the same place they came from) and pump the lifter until all the old oil gets purged with clean oil.
But you have to see what they want to do.
But you have to see what they want to do.
Anyway, now is not a good time for me to have to undertake an engine teardown or rebuild.
Hopefully the warranty will cover all.
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Pro
Joined: Apr 2009
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From: Seattle WA (Sammamish)
seafoam is supposed to clean the lifters well. im on an offroad forum alot and they swear by it. The early Nissan Pathfinders have noisy lifters all the time, and the motors routienly go for 250+ thousand miles.. Im waiting for someone to use it on here...
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From: Houston, Texas, USA
I guess sometimes you just gotta.
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Joined: Aug 2009
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Parts Specialist
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Thread Starter
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Joined: Aug 2009
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From: Houston, Texas, USA
I'm at least 2 hours away from the coast so seafoam is not really practical.
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Joined: Aug 2009
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From: Houston, Texas, USA