Engine or transfer chain noise

CHRIS BURGE

MEMBER
2002 BMW X5
3.0L
6 CYL
4WD
AUTOMATIC
235,000 MILES

At exactly 2500 to 2800 rpm I have a louder than ticking noise in center of engine bay. I am a mechanic, but cannot pin point this. It gets louder with a heavy pedal. It sounds twice as loud as a heat shield vibrating. I was thinking the transfer case chain. I had the front end up and it seems like it is looser when moving a wheel left to right.

5 Replies

CARADIODOC

MECHANIC
33,871 POSTS

If it is engine noise, the vehicle does not have to be moving for the noise to occur. For noises in the transfer case, it has to be operating, meaning you have to moving.

Are you familiar with the "Chassis Ear"? That will allow you to listen while you are driving.

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Wednesday, February 15th, 2017 AT 1:37 PM

CHRIS BURGE

MEMBER
21 POSTS

It will make the noise when in neutral. I made a video of the noise. https://youtu.be/il3LUO4sCbU
So that chain will not be move when in neutral right?

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Wednesday, February 15th, 2017 AT 3:24 PM

CARADIODOC

MECHANIC
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This computer pile will not play internet sound.

Also, consider using a stethoscope to look for the source. Your engine uses a timing chain with a spring-loaded tensioning device. If the chain is loose or worn, it can slap against the housing and make a rattling noise.

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Wednesday, February 15th, 2017 AT 6:23 PM

CHRIS BURGE

MEMBER
21 POSTS

Okay thanks. Would I be able tighten this tension-er? I am on all data and it states screw plug for tension-er is 40 Nm and cylinder for chain tension-er is 70 Nm. Thanks again for the help.

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Wednesday, February 15th, 2017 AT 7:04 PM

CARADIODOC

MECHANIC
33,871 POSTS

Those are just the tightening specs for the parts that hold the tensioner spring. You can remove the housing to inspect the spring, but more than likely any problem in this area will involve the internal shoe that puts the pressure on the spring.