What is this sound???

joserw · May 20, 2011

YouTube - ‪2001 Ford Mustang 4.6L ticking noise‬&rlm;

You can really hear it around 0:45 in the video. It sounds like a rattle snake almost. It's not constant and you really can't hear it at all RPMs. It is also more pronounced when the engine is warm. Any ideas what this could be and how to fix it???

trinity_gt · May 20, 2011

joserw said:
YouTube - ‪2001 Ford Mustang 4.6L ticking noise‬&rlm;

You can really hear it around 0:45 in the video. It sounds like a rattle snake almost. It's not constant and you really can't hear it at all RPMs. It is also more pronounced when the engine is warm. Any ideas what this could be and how to fix it???

First, what the hell kind of road was that?

Second, the rattle sounds a bit like a rod bearing. When did it start doing it?

joserw · May 20, 2011

It's a shi**y New York road.

I don't remember when it started doing it, but the engine hasn't lost any power.

Deleted member 38176 · May 20, 2011

Spun bearing

joserw · May 20, 2011

Wouldn't that affect drivability? Is this something that is going to end up being catostraphic if I don't get it looked at?

trinity_gt · May 20, 2011

joserw said:
Wouldn't that affect drivability? Is this something that is going to end up being catostraphic if I don't get it looked at?

If a bearing has spun it's already catastrophic.

Driveability may not be affected in the early stages. What's happened is that the bearing shell has spun in the rod big end, causing metal-to-metal wear, opening up a clearance that you're hearing as the knock. This will be damaging the crank journal, the rod is trash and there's likely metal in the engine's oil system.

The fix is to tear into the engine and replace the bearings and that rod or to go for a replacement engine (such as from a wreckers or a shortblock from a vendor here on Stangnet.)

Deleted member 38176 · May 20, 2011

joserw said:
Is this something that is going to end up being catostraphic if I don't get it looked at?

Like Trinity mentioned, it's already too late.

joserw · May 21, 2011

I changed the oil last week and no metal shavings. I'd like to think positive, could it be anything else?

Deleted member 38176 · May 21, 2011

For reference purposes

YouTube - ‪2002 Mustang GT Spun Rod Bearing‬&rlm;

Sounds awefully similar

joserw · May 21, 2011

The video you sent sounds like a deeper knocking noise, mine sounds more high pitched like a woodpecker almost... I guess I'll drop it off at mechanic to see what it is...

If it's DOA I'm thinking about doing a rebuild withg a kenne bell sc and trickflow heads. Anyone have an experience with the heads?

Deleted member 38176 · May 21, 2011

joserw said:
The video you sent sounds like a deeper knocking noise, mine sounds more high pitched like a woodpecker almost... I guess I'll drop it off at mechanic to see what it is...

If it's DOA I'm thinking about doing a rebuild withg a kenne bell sc and trickflow heads. Anyone have an experience with the heads?

Well whatever the case, good luck

txredgt · May 21, 2011

joserw said:
The video you sent sounds like a deeper knocking noise, mine sounds more high pitched like a woodpecker almost... I guess I'll drop it off at mechanic to see what it is...

If it's DOA I'm thinking about doing a rebuild withg a kenne bell sc and trickflow heads. Anyone have an experience with the heads?

If you arn't going to do the work yourself I hope you have some deep pockets for what you are planning.. If you are rebuilding already you might as well fork out more money for a new block assuming you don't have to right now. Trickflow and Kenne bell will run 6 grand without labor.

midnightdriver · May 22, 2011

txredgt said:
If you arn't going to do the work yourself I hope you have some deep pockets for what you are planning.. If you are rebuilding already you might as well fork out more money for a new block assuming you don't have to right now. Trickflow and Kenne bell will run 6 grand without labor.

+ 1

It would be awesome but look to spend about 8k total if going that route.

joserw · May 22, 2011

If I'm going to build up my car I want to do it right. The other option is get a new 5.0, or hopefully if my car lasts picking up a used 5.0.

My only concern with the build up is that, while the car is in very good shape, it still has the dings and dents you'd expect on a ten year old car... it would be nice to have something totally custom though.

joserw · May 23, 2011

I had a friend take a look and we determined that the noise was coming from the rear pas side of the motor. His $.02 were either a wrist pin (just as bad as a spun bearing in the long run) or a cracked fly wheel. Has anyone ever heard of a fly wheel cracking on a 4.6?

Deleted member 38176 · May 23, 2011

A cracked flywheel is not common at all on 4.6's. In fact, I can't recall hearing about ANYONE having one on all the mustang forums I frequent.

fast97gt · May 23, 2011

A little fyi, I would much rether have a bad wrist pin then a spun bearing, 1 wrist pin requires a new pin, rod, and piston. 2 spun bearing you need mechine work, new crank rod(s) or if its main you mite as well chaulk it up to a new engine. That's my $.02

joserw · May 23, 2011

I guess I won't know unless I take the car to Ford, since every mechanic tells me something different lol, or I shoot a rod through my block

joserw · May 24, 2011

Sorry to beat a dead horse... BUT my dad works for a livery service and he took the car to the shop mechanic who knows 4.6L's inside and out... and this guy said it could be a defective catalytic converter. Could this theory hold any water?

I should add, that it's been making this noise for about 3 or 4 months now (or that's as long as I've noticed it). Wouldn't a spun bearing have seized up the engine by now?

RedDaemon · May 24, 2011

regardless of personal opinion, cats would certainly be the cheaper route. change them and see what happens. then go the more expensive route if needed.

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