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Registered User
Join Date: May 2019
Location: Perth, Australia
Posts: 5
Boxster Engine rattle while running..

Morning Boxster Brainstrust,

Long time lurker, first time poster, so please be gentle with me.. :-)

OK, so I have a '97 Boxster that I have owned for some time and so far she's been pretty good to me. I've had some of the common problems during her time with me, like the AOS, MAF etc that have been fairly easily rectified but I'm currently chasing a 'rattle' in the engine bay that I'm having trouble identifying..

I've posted a short video on YouTube hoping that someone may be able to assist.

It sounds like one of the pulleys is striking something in the engine bay, although it's irregular as I hope you can hear in the video.

I've slipped the belt off and the engine purrs like a kitten, so it's not internal (I was thinking timing chain initially) and all the pulleys seem fine.

The Idler bearings were replaced a while back, but she wouldn't have done 2000k's since replacement. Although using the old screwdriver to the ear, the bottom idler sounds noisier, but I'm thinking that's because it's closer to the source. I whipped it out and the bearing rotates easily and feels smooth.

There is a very small amount of movement in the AC pully which seems OK (to me at least) and there is no difference in the sound with the AC engaged or disengaged.

I can 'twist' the water pump pulley probably about .5mm which doesn't seem excessive to me.

Power steering reservoir fluid level is correct.

If anyone has any suggestions as to where to go from here, I'd appreciate hearing them.. :-)

Old 05-18-2019, 01:41 AM
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