997.2 3.8 Engine Failure
#61
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So i sent out a sample for UOA today and dropped the pan. Found 2 rubber pieces one stuck to the oil pickup tube mesh screen and the other one floating around. I also found the metal piece thats shiny and smooth on both sides and its slightly bent. The magnet is able to pick it up. I didnt see too much metal particles in the oil, there were some but i would say that oil filter housing had more.. Any ideas were the rubber and that type of metal could come from?
I still have hope that i will not need complete engine rebuild.
Heres what it looks like up there with a pan dropped, cant really see much without boroscope. Was hoping to see part of the chain or the crank but oil pump is in the way and i dont think i want to be digging deeper. I just wanted to see how much metal there was in a pan but ill have a shop probably take it from here.
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I still have hope that i will not need complete engine rebuild.
Heres what it looks like up there with a pan dropped, cant really see much without boroscope. Was hoping to see part of the chain or the crank but oil pump is in the way and i dont think i want to be digging deeper. I just wanted to see how much metal there was in a pan but ill have a shop probably take it from here.
![Name: pXUcQkv.jpg
Views: 533
Size: 653.6 KB](https://rennlist.com/forums/attachments/997-forum/1348309d1683257005-997-2-3-8-engine-failure-pxucqkv.jpg)
![Name: ODS1wen.jpg
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Size: 559.5 KB](https://rennlist.com/forums/attachments/997-forum/1348310d1683257005-997-2-3-8-engine-failure-ods1wen.jpg)
![Name: qFIaDOP.jpg
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Size: 458.4 KB](https://rennlist.com/forums/attachments/997-forum/1348311d1683257005-997-2-3-8-engine-failure-qfiadop.jpg)
![Name: COqQiqP.jpg
Views: 522
Size: 1.23 MB](https://rennlist.com/forums/attachments/997-forum/1348312d1683257005-997-2-3-8-engine-failure-coqqiqp.jpg)
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#63
Three Wheelin'
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I don't really know what I'm talking about, but it looks like that plastic got chewed up by the timing chain. Maybe the timing chain rail failed?
#64
Pro
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I don't think you're looking at engine failure here. The black pieces are sealant or broken off from plastic item; the metal a piece of flashing from assembly process. Clean prior UOAs, no check engine light and lack of debris in pan makes me think source of noise you've heard is external to engine, such as water pump, alternator, AC compressor or serpentine belt tensioner.
Last edited by swingwing; 12-29-2018 at 10:38 AM. Reason: Added wording, sentence.
#65
Rennlist Member
Thread Starter
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UPDATE:
Pulled the airbox out to check the belt tensioner. Its completely shot, and doesnt even spring back up after you apply pressure with 30mm wrench. You need to lift it back in place. Ordered new hydraulic tensioner, lever and roller. Still doesnt explain the particles in the oil, but hopfully the tensioner is the reason for the loud banging noise.
Pulled the airbox out to check the belt tensioner. Its completely shot, and doesnt even spring back up after you apply pressure with 30mm wrench. You need to lift it back in place. Ordered new hydraulic tensioner, lever and roller. Still doesnt explain the particles in the oil, but hopfully the tensioner is the reason for the loud banging noise.
#66
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Edited: I misread belt tensioner as chain tensioner. Two very different things.
The failed belt tensioner could very well be the source of your noise, but it wouldn’t cause the debris you found.
The failed belt tensioner could very well be the source of your noise, but it wouldn’t cause the debris you found.
UPDATE:
Pulled the airbox out to check the belt tensioner. Its completely shot, and doesnt even spring back up after you apply pressure with 30mm wrench. You need to lift it back in place. Ordered new hydraulic tensioner, lever and roller. Still doesnt explain the particles in the oil, but hopfully the tensioner is the reason for the loud banging noise.
Pulled the airbox out to check the belt tensioner. Its completely shot, and doesnt even spring back up after you apply pressure with 30mm wrench. You need to lift it back in place. Ordered new hydraulic tensioner, lever and roller. Still doesnt explain the particles in the oil, but hopfully the tensioner is the reason for the loud banging noise.
Last edited by rw229; 12-29-2018 at 01:39 PM.
#67
Nordschleife Master
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UPDATE:
Pulled the airbox out to check the belt tensioner. Its completely shot, and doesnt even spring back up after you apply pressure with 30mm wrench. You need to lift it back in place. Ordered new hydraulic tensioner, lever and roller. Still doesnt explain the particles in the oil, but hopfully the tensioner is the reason for the loud banging noise.
Pulled the airbox out to check the belt tensioner. Its completely shot, and doesnt even spring back up after you apply pressure with 30mm wrench. You need to lift it back in place. Ordered new hydraulic tensioner, lever and roller. Still doesnt explain the particles in the oil, but hopfully the tensioner is the reason for the loud banging noise.
#68
Three Wheelin'
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Hopefully you found it. Bad serpentine belt tensioner is causing the noises. I don’t think it’s the timing chain “bouncing around”. If it was, wouldn’t it have caused the valves and pistons to collide?
#69
Rennlist Member
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That is my concern. These engines typically have little to no debris in them at every service. We always drop the sumps at time of oil change and never find debris unless there is a failure in process.
#70
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Pulled out the tensioner this morning. First of all the pivot bolt for tensioner lever was not even tight, i was able to undo it with my fingers! Secondly the bushings are very loose and can be seen in this video. Prettt sure theyre not supposed to be like that but i will compare once i get the new parts from Pelican.
#71
Rennlist Member
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Pulled out the tensioner this morning. First of all the pivot bolt for tensioner lever was not even tight, i was able to undo it with my fingers! Secondly the bushings are very loose and can be seen in this video. Prettt sure theyre not supposed to be like that but i will compare once i get the new parts from Pelican.
http://youtu.be/pWmeO_MKasU
http://youtu.be/pWmeO_MKasU
#72
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UPDATE:
Pulled the airbox out to check the belt tensioner. Its completely shot, and doesnt even spring back up after you apply pressure with 30mm wrench. You need to lift it back in place. Ordered new hydraulic tensioner, lever and roller. Still doesnt explain the particles in the oil, but hopfully the tensioner is the reason for the loud banging noise.
Pulled the airbox out to check the belt tensioner. Its completely shot, and doesnt even spring back up after you apply pressure with 30mm wrench. You need to lift it back in place. Ordered new hydraulic tensioner, lever and roller. Still doesnt explain the particles in the oil, but hopfully the tensioner is the reason for the loud banging noise.
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Tle (07-03-2019)
#73
Drifting
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Im with you. With all that crap floating around in the engine (plastic and metal!) who knows whats going on in that engine. Even if it is the tensioner wouldnt you want a pro to have a look at it before you crank it up?
#74
RL Community Team
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Peace
Bruce in Philly