vid of engine noise - what is it? lifters?
vid of engine noise - what is it? lifters? UPDATE 8/27: machine shop says #7 piston was burnt up. The crank is OK
while driving it and coming to a stop light, i heard a loud tapping sound that seemed to go away. i parked it less than 1/2 mile later at home. started it up the next day and after a few minutes it made the same loud tapping sound and shut it off. i tried again letting it idle for 5+ minutes twice, but it wouldn't reproduce the sound.
but valvetrain seems to sound louder with a tapping noise. i took a video and i think the phone cam is picking up the sound pretty good - can't hear it too good over all the other noise in person though.
what does it sound like to you?
edit: new vid very short. can hear it distinctly 4 seconds in. it sounds like it is coming out of the block and it does not sound good.
while driving it and coming to a stop light, i heard a loud tapping sound that seemed to go away. i parked it less than 1/2 mile later at home. started it up the next day and after a few minutes it made the same loud tapping sound and shut it off. i tried again letting it idle for 5+ minutes twice, but it wouldn't reproduce the sound.
but valvetrain seems to sound louder with a tapping noise. i took a video and i think the phone cam is picking up the sound pretty good - can't hear it too good over all the other noise in person though.
what does it sound like to you?
edit: new vid very short. can hear it distinctly 4 seconds in. it sounds like it is coming out of the block and it does not sound good.
Last edited by BobDoLe; Aug 27, 2014 at 11:33 PM.
Def seems same rpm as crank, rod bearings are likely.
Step 1 would be to do an oil change and run the oil through a cheese cloth or one of those paint filters you get from the auto parts store to check for filings.
Step 2 would be to remove valve covers, check the rockers and check all the pushrods make sure the caps are on the sides and there is no up down movement of the pushrods like in a collapsed lifter.
I think you may find your cause on step 1 though.
Step 1 would be to do an oil change and run the oil through a cheese cloth or one of those paint filters you get from the auto parts store to check for filings.
Step 2 would be to remove valve covers, check the rockers and check all the pushrods make sure the caps are on the sides and there is no up down movement of the pushrods like in a collapsed lifter.
I think you may find your cause on step 1 though.
update - have been out of town for work, so haven't done anything with the car. however, i started it up and let it idle for a bit. i revved it to like 2k rpm twice and shortly after that, i heard something rattling around which didn't match the rpm at all. it was like a rattle... rattle-rattle... rattle... rattle-rattle-rattle............rattle. while this happened, the engine stumbled, but it stopped on its own and idle came back to normal
this was the sound i heard initially when i decided to stop driving it. any ideas on what that could be?
this was the sound i heard initially when i decided to stop driving it. any ideas on what that could be?
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If it sounds half the rpm then its likely top end. Ive seen that happen alot. The lifter body/plunger will stick sometimes internally. Not a good thing. Not saying 100% this is exactlywhat you are seeing but I can be an issue.
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Oil pressure can change for quite a few reasons. I have personally seen a few 5.3s with cams and stock spin cam bearings and the oil pressure drop. Then I have also seen horrid main and rod bearings on a tear down, oil pressure show near 40psi at idle and it make a low thrumming noise. Not even a rod knock sound.
i've been out of town for work again which is why i haven't taken care of this yet. i got back in and started it up today and after idling for a minute, i heard very distinct tap/rattle sounds coming out of the block.
new vid very short. can hear it distinctly 4 seconds in. it sounds like it is coming out of the block and it does not sound good.
still think its a rod bearing?
new vid very short. can hear it distinctly 4 seconds in. it sounds like it is coming out of the block and it does not sound good.
still think its a rod bearing?
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Joined: Aug 2004
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From: Auckland, Nth Is, New Zealand.
Problems not going away while the car just sits there.
I was busy working out of state and the car is my lowest priority. When I was home, I was more concerned that all the dust on it would make the hoa think the car wasn't running and so I'd clean it and let it idle. I have two other cars that were made in the current decade. If I didn't have the extra cash lying around I would have just let it sit until next year.
They were thinking it was nitrous going lean in that cylinder years ago and the problem just surfaced now, but I'm not sure
another update
injectors
i just got the injector service report and they did mark the injectors before sending them out. at 3 bar, #7 had a less than decent spray pattern and was only flowing 63.5ml whereas the others were flowing around 84.5ml.
also.. it looks like a small chunk of the intermediate piston ring is embedded onto the top of the piston
injectors
i just got the injector service report and they did mark the injectors before sending them out. at 3 bar, #7 had a less than decent spray pattern and was only flowing 63.5ml whereas the others were flowing around 84.5ml.
also.. it looks like a small chunk of the intermediate piston ring is embedded onto the top of the piston
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Joined: Mar 2013
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I looked at these pictures carefully and I don't see any signs of that piston failing from overheating. From here it looks like something entered the cylinder and as the piston came up it got in between the piston and head breaking the pistson THEN the broken rings got smashed into the top of the piston. If that piston failed from overheated it would be melted and pitted badly. Did someone work on the engine just before theis happened? Be sure to check carefully for broken ANYTHING laying in the intake before having this put back together.
Its very common for broken pieces to get back into the intake then if its not cleaned out destroy the repaired engine. Another important place to remove any broken pieces is from the exhaust. Yes its very possible to drag back broken pieces from the exhaust too.
I would carefully remove the broken pieces imbedded in the top of the piston and examine them closely to see what they are and where they came from.
Its very common for broken pieces to get back into the intake then if its not cleaned out destroy the repaired engine. Another important place to remove any broken pieces is from the exhaust. Yes its very possible to drag back broken pieces from the exhaust too.
I would carefully remove the broken pieces imbedded in the top of the piston and examine them closely to see what they are and where they came from.
Where the ringland chunk is missing it is actually melted though it is hard to show it in a picture. Not sure if that helps. They did go through everything including the heads and intake manifold. Other than a ton of oil there was nothing
I looked at these pictures carefully and I don't see any signs of that piston failing from overheating. From here it looks like something entered the cylinder and as the piston came up it got in between the piston and head breaking the pistson THEN the broken rings got smashed into the top of the piston. If that piston failed from overheated it would be melted and pitted badly. Did someone work on the engine just before theis happened? Be sure to check carefully for broken ANYTHING laying in the intake before having this put back together.
Its very common for broken pieces to get back into the intake then if its not cleaned out destroy the repaired engine. Another important place to remove any broken pieces is from the exhaust. Yes its very possible to drag back broken pieces from the exhaust too.
I would carefully remove the broken pieces imbedded in the top of the piston and examine them closely to see what they are and where they came from.
Its very common for broken pieces to get back into the intake then if its not cleaned out destroy the repaired engine. Another important place to remove any broken pieces is from the exhaust. Yes its very possible to drag back broken pieces from the exhaust too.
I would carefully remove the broken pieces imbedded in the top of the piston and examine them closely to see what they are and where they came from.
Just my opinion... or just trust your engine builder because I'm just some guy on the internet suggesting you dig deeper.