help me identify whats wront with my motor... i think its bearings??

[Loochy88]

Update: no longer thinking bearings... see post on 9/16 page 2. Found brass shards in upper intake and #2 intake runner...

I replaced my intake gaskets (upper and lower) this summer. found coolant in the oil. job took a long time... i did it in parts... i was in no hurry... and im slow. but i was also careful to do everything right.

engine had a little bit of noise before the swap (a nearly inaudible rattle like noise when you would let off a rev at idle...) i got everything back together and the motor sounds like it may be shot. i dont know if its because it sat such a long time (maybe i had bearing issues already, and they dried up, and when started they really went)

the motor started, ran for a few seconds... then started doing what you hear in the video below. it will still start, and then die. i only started it a couple times... im afraid to run it any more. i was a little worried i'd dropped something in the motor somewhere but i really doubt thats it. i'd be suprised. I am assuming bearings or some other major bottom end issue. i just cant figure why the heck its such an intermittent sound... when I've heard bearings before they were a very consistent... pattern like sound... like you'd expect... not this sperratc noise you hear my motor making. to be honest i cant remember if the second time i ran it, the sound evened out to a more patterned knock. the video is the first time it ran. any other ideas what it may be are appreciated. keep in mind it stalls on its own... thats not me turning the motor off.

http://www.youtube.com/watch?v=btNFT...er_profilepage

[bigbrian442]

Re: help me identify whats wront with my motor... i think its bearings??

Sounds like something is bouncing around in the motor from what I can tell in the vid. How does the new oil look?

[ssms5411]

Re: help me identify whats wront with my motor... i think its bearings??

Vac. lines all connected? I also had a loud knocking noise before when the balancer dry rotted out from the inside but it would still idle.

[Loochy88]

Re: help me identify whats wront with my motor... i think its bearings??

Sounds like something is bouncing around in the motor from what I can tell in the vid. How does the new oil look?

thats not what i like to hear. i was really careful too. i figure the damage in this case would be bent valves? where would i look assuming somehting fell in an intake port or into an open fuel injector hole... would it even make it into the cylinder?

a borescope might be a useful investment at this point. i can get to the interior of the cylinder through the spark plug hole... unless it wouldnt even be in there yet

oil is ok because i just changed it. right before the intake gasket job. before the job it was milky since (i assume) the intakes gaskets were leaking coolant through...

[Loochy88]

Re: help me identify whats wront with my motor... i think its bearings??

Vac. lines all connected? I also had a loud knocking noise before when the balancer dry rotted out from the inside but it would still idle.

what would be other signs of the balancer rotting.... doesnt seem like something that would happen so suddenly. vac lines are all good to go. double checked everything.

[bigbrian442]

Re: help me identify whats wront with my motor... i think its bearings??

I would think the piston would already be history if it made it into the cylinder. I would pull the upper intake and put a magnet down each cylinder. Turn it by hand and make sure all the valves close. If it's a socket it might be too big to get past the valve and is just bouncing around the intake.

The bad dampers and bottom end knocks are usually a steady knock.

[cam98aro]

Re: help me identify whats wront with my motor... i think its bearings??

it really sounds like something is banging around, and not a mechanical problem like a bearing

i would change the oil and see if it goes away or if anything comes out, its possible that something fell into the engine when you replaced everything and worked its way into the oil pan

[Loochy88]

Re: help me identify whats wront with my motor... i think its bearings??

maybe... but still... why would this cause the motor to stall?

[bigbrian442]

Re: help me identify whats wront with my motor... i think its bearings??

maybe... but still... why would this cause the motor to stall?

Not sure why the motor stalls, But you still need to pull it apart to find the noise. If it's the bottom end I would think the oil would be full of glitter by now. Maybe what every is bouncing around is getting stuck in a valve holding it open causing it to stall. Or the knock sensors are hearing the noise and thinking it's spark knock and pulling too much timing.

[Loochy88]

Re: help me identify whats wront with my motor... i think its bearings??

Not sure why the motor stalls, But you still need to pull it apart to find the noise. If it's the bottom end I would think the oil would be full of glitter by now. Maybe what every is bouncing around is getting stuck in a valve holding it open causing it to stall. Or the knock sensors are hearing the noise and thinking it's spark knock and pulling too much timing.

hoopefully its the knock sensor pulling timing, and not the valve getting stuck/bent. If there is something in there, theres most likely already damage. maybe ill get lucky though and it will have been big enough that it couldn't get in, and maybe even didn't bend the valve. im going to pull the upper intake tonight... see if i pull anything out...

If i dropped something down the hole the fuel injector sits in, i would still be looking in the same place i assume?

[bigbrian442]

Re: help me identify whats wront with my motor... i think its bearings??

yes. The hole for the fuel injector just goes into the intake port.

[Loochy88]

Re: help me identify whats wront with my motor... i think its bearings??

Well, i pulled the upper intake. This was found mostly in the intake port to cylinder 2. Looks like brass... possibly part of the valve train. If i dropped something in, this probably isn't it, but rather just evidence of the damage done. Any idea what im looking at. I even found a couple pieces in the upper intake when i took it off. Not sure what to do next...?

[bigbrian442]

Re: help me identify whats wront with my motor... i think its bearings??

It almost looks like the screw on tip to a spark plug where the boot would go over. Since it's broken up I would have to say it got into at least one of the cylinders. I would do a compression test before I put the intake back on. Make sure you pull the Fuel pump fuse if you do. Only other option would be to pull the heads. Brass is soft so you might be OK.

[ssms5411]

Re: help me identify whats wront with my motor... i think its bearings??

It looks to me like part of the brass valve guide sleeve for on for the valves, that may have come loose and dropped with the valve. I have a new set here and comparing it, it looks alot like it.

[ssms5411]

Re: help me identify whats wront with my motor... i think its bearings??

Did you check the valve guide on that head becuase it would expalin the air sound also coming out the valve, becuase it looks exactly like the stock brass valve guides and the pre 98 heads are known for flaws on the heads. I had a valve guide break off the head completely even after the machine shop milled it and checked it out. I had to replace the whole head. The upgraded heads from like abbott and ZZP come with bronze valve guides which are a upgrade. If you need a pic of the brass valve guide let me know I can take a pic of one since I bought a new set by accident when buying valves. Also if you replace the head try to get 98+ heads they don't have the weak spots like pre 98's. Good luck