Engine developed rattle/ticking noise, what could it be? Does it sound expensive? :(
07-22-2013, 04:26 AM
#21
I found this pic of failed rocker - mine are nothing like that.
http://img.photobucket.com/albums/v1...MG_3635_cw.jpg
Still, last time I tried to locate the sound with 2 different stethoscopes, sound appeared to come from driver side rocker cover.
Also now there is more than just ticking. There is also intermittent noise, sometimes like something is grinding not just tapping.
Maybe I have chain failing?
edit: I tried removing injectors connectors one by one, sound never changed, so I hope rod bearings are not spun?
Also I see a lot of knock and timing retard registered while just cruising, if that hints something...
http://img.photobucket.com/albums/v1...MG_3635_cw.jpg
Still, last time I tried to locate the sound with 2 different stethoscopes, sound appeared to come from driver side rocker cover.
Also now there is more than just ticking. There is also intermittent noise, sometimes like something is grinding not just tapping.
Maybe I have chain failing?
edit: I tried removing injectors connectors one by one, sound never changed, so I hope rod bearings are not spun?
Also I see a lot of knock and timing retard registered while just cruising, if that hints something...
Last edited by Vetal; 07-22-2013 at 05:55 AM.
07-22-2013, 06:17 PM
#22
I've checked pushrods and rockers, they are not bent or anything.
Valve stems also are almost even without rockers, with only valve #2 being 0.004" lower than the rest, and #8 about .002-.003" lower.
I also drained oil (somehow my plug wasn't magnetic unfortunately) and cut open oil filter, it had couple of shavings but nothing to worry about.
I'm starting to think this rattling might be rod knock? Although using stethoscope I was confident rattling comes from driver side valve cover...
Can I check anything else?..
Valve stems also are almost even without rockers, with only valve #2 being 0.004" lower than the rest, and #8 about .002-.003" lower.
I also drained oil (somehow my plug wasn't magnetic unfortunately) and cut open oil filter, it had couple of shavings but nothing to worry about.
I'm starting to think this rattling might be rod knock? Although using stethoscope I was confident rattling comes from driver side valve cover...
Can I check anything else?..
07-22-2013, 09:25 PM
#23
I had a lifter take a **** and wipe out a lobe on the cam. Get a mag plug, if its that you will be making steel. Take a flashlight and look at the cam through the oil drains, especially for any loose rockers. Metal will smear beyond the edges of the cam lobes If a lifter has started eating it. Rotate the crank and look again. Also helps to pull the intake and valley cover...the noise when running sounds like a light scratching. The lifters will likely not pull out from the top if this is the case.
It sounded to my non expert ears to be the bottom on yours though. Got any blowby? Look at the plugs, leakdown, compression? How about the bellhousing inspection port and/or pull the starter? Maybe a broken flexplate? Maybe drop the belt to make sure its not an accessory?
Just throwing stuff out that you might have had other clues on. Good luck.
It sounded to my non expert ears to be the bottom on yours though. Got any blowby? Look at the plugs, leakdown, compression? How about the bellhousing inspection port and/or pull the starter? Maybe a broken flexplate? Maybe drop the belt to make sure its not an accessory?
Just throwing stuff out that you might have had other clues on. Good luck.
07-23-2013, 02:19 AM
#24
I had a lifter take a **** and wipe out a lobe on the cam. Get a mag plug, if its that you will be making steel. Take a flashlight and look at the cam through the oil drains, especially for any loose rockers. Metal will smear beyond the edges of the cam lobes If a lifter has started eating it. Rotate the crank and look again. Also helps to pull the intake and valley cover...the noise when running sounds like a light scratching. The lifters will likely not pull out from the top if this is the case.
It sounded to my non expert ears to be the bottom on yours though. Got any blowby? Look at the plugs, leakdown, compression? How about the bellhousing inspection port and/or pull the starter? Maybe a broken flexplate? Maybe drop the belt to make sure its not an accessory?
Just throwing stuff out that you might have had other clues on. Good luck.
It sounded to my non expert ears to be the bottom on yours though. Got any blowby? Look at the plugs, leakdown, compression? How about the bellhousing inspection port and/or pull the starter? Maybe a broken flexplate? Maybe drop the belt to make sure its not an accessory?
Just throwing stuff out that you might have had other clues on. Good luck.
Thanks for ideas! Yes I'm going to remove acc belt when I put valvetrain back.
Will check TC/flexplate and bolts too, as well as compression test (will check plugs while doing this, but can't imagine what would I see on them).
But why drop the starter?
I guess I have to put everything back together and record sound it makes. Although I am almost sure now it is rod bearing
07-23-2013, 11:18 AM
#26
I've noticed that every other rocker bolt hole must be protruding into the ports since I could put 5" long ziptie in the hole. Should I put some silicone on rocker bolts thread to prevent oil leak in the intake port or boost pressurizing valve covers? Or will the bolt provide enough seal?
07-24-2013, 04:37 PM
#32
Assembled driver side valvetrain back and recorded some sound. Now sound changed again: instead of very pronounced knock there is "barking", especially in low revs. I can hear it best when I put stethoscope to middle upper valve cover bolt (driver side), that's 100%.
07-24-2013, 09:47 PM
#33
Yeah man. One thing is for sure, you are going to be tearing into it. You could pull the valley cover or yank the cam and see if its hosed, but I think you need to be looking in that oil pan. Ive never heard a spun bearing, but thats what id imagine one sounds like. In any case I would definitely stop starting it and listening to it. I bet if you rotate it by hand you will hear it at this point.
07-24-2013, 10:46 PM
#34
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yup definitely gotta open her up. hope that you have help as well. Good luck and keep us updated please. I haven't the slightest clue as to what could be wrong so i am not going to try and even say what it could be. I would like to know what ya find tho for future reference lol
07-25-2013, 01:57 AM
#36
idk.
But he fixed lifter tick with a simple flush without removing the head .. hope it helps ya .. peace Chevy 5.3 liter lifter noise and motor flush solution How to - YouTube
But he fixed lifter tick with a simple flush without removing the head .. hope it helps ya .. peace Chevy 5.3 liter lifter noise and motor flush solution How to - YouTube
07-25-2013, 03:22 AM
#38
On The Tree
You don't have a bore scope by chance? That would make this that much easier in finding what it may or may not be. However, by the sounds of things, it's most likely a spun bearing.
My 2c.
My 2c.