Noise from engine bay

[xfiles67]

Hello,

Lately the Expo has been very quiet, nothing out of the ordinary as far as noises go, Friday before last the "grindy" or "can of marbles" noise started.


Like I said, it just all started Friday before last, drove it home Friday morning and she was nice and quiet, no rattle.

She's slightly overdue for an oil change and is a tad heavy.

I also recorded a video of engine noise while instead the cab driving but sadly almost all you can make out is the annoying exhaust leak it has.


Mostly worried this is going to be related to the timing chain, but unsure. I haven't taken the belt of yet and started it up to see if the noise continues, need to do that.

What do you guys think?

 

[Hamfisted]

I'm gonna guess the alternator is going bad .... they kinda sound like that just before they grenade .... you can take the belt off and run it for a minute and see if the noise disappears with the belt off. Use caution for overheating if you run it too long, as your fan and water pump will not be operating. Do it when the engine is cooled down anyway. You can probably even take the belt off and with the engine not running spin the alternator pulley and the other tension pulley and you'll be able to tell which one is causing the noise.



-Mike

 

[1955moose]

With the belt off, the culprit pulley will sound like a worn out roller skate. Or for the young group out there crunchy marbles.


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[docraymund]

It's the cam phasers.

 

[docraymund]

Check this out:

 

[stamp11127]

Sounds aren'the the same in the op's video and the phasers video. The op's video reminds me of loose chains.

 

[xfiles67]

I've watched numerous Cam Phasers video's and one thing that seems to be a common noise is a diesel like sound, mine is more of a rattle, but in any event, have an update:

Removed the belt, no strange noise from the alternator, best I can tell anyway, does seem I have a bad pulley, video's below.


Here's the Expo running with the belt off:


And with the belt back on:

 

[stamp11127]

Now that you have checked with the belt off and still have the sound, that points to an internal engine issue. At this point I no longer run an engine until the source is found. Should the timing chain tensioner(s) fail, the slack in the chains can allow a drastic change in valve timing with the result of having to rework the heads.
If the sound you are hearing is really at the rear of the engine that is usually a broken flex plate and sounds like nuts in a can.
Whatever you do - don't Rev the engine. It is now time to "bust your knuckles".

 

[xfiles67]

The noise, when standing near the vehicle, is the loudest when standing directly in front of the grille.

Was really hoping it was the alternator.....

 

[Hamfisted]

Yeah optimistically it would've just been the alternator.... but now that sounds like the timing chain guide(s) .... How many miles on the motor ?


-Mike

 

[1955moose]

I agree with the other guys it sounds like you've got to get dirty. In your video you spun the alternator, it sounded fine. What about the other pulleys ie belt tensioner, smog pump, power steering?


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[2004XLT]

I'm going with timing chain tensioners if it's louder in the front. What's your mileage at?

 

[xfiles67]

I agree with the other guys it sounds like you've got to get dirty. In your video you spun the alternator, it sounded fine. What about the other pulleys ie belt tensioner, smog pump, power steering?


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One pulley was a bit wobbly with a squeal, just to the left and up from the oil filter, just to the left of the power steering pump.

142+ on the clock.

 

[1955moose]

Before you pull apart timing cover remove belt, and spin all pulleys. Had a member about 6 months back had a bad belt tensioner. Sounded like a skate. If all are quiet, time to pull cover. Don't drive anymore!


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[xfiles67]

Before you pull apart timing cover remove belt, and spin all pulleys. Had a member about 6 months back had a bad belt tensioner. Sounded like a skate. If all are quiet, time to pull cover. Don't drive anymore!


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All pulleys have been spun, just 1 with a chirp, rattle still there with engine running without belt.

Videos on first page.

 

[1955moose]

Well looks like your pulling timing cover!


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[xfiles67]

So that begs the next question, with 142+ on the clock if one is going to do a timing set job it almost seems dumb not to replace the oil pump right?

 

[stamp11127]

Don't worry about the oil pump at this point unless you have low oil pressure. If you discover parts of the chain guides are missing, they always end up in the oil pan. At that point you need to drop the pan and get them out. If you don't you risk the chance of blocking the pickup tube. You don't want that to happen.

 

[xfiles67]

So not at all looking forward to this I've been checking out the local shops, out of 3 I checked with only 1 was interested in the job, at almost $1800......

 

[1955moose]

Any of our members in Virginia want to give xfiles67 a hand!


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