Go Back   986 Forum - for Porsche Boxster & Cayman Owners > Porsche Boxster & Cayman Forums > Performance and Technical chat

LinkBack Thread Tools Display Modes
Old 06-20-2015, 09:55 AM   #1
Registered User
Join Date: Jun 2015
Location: Western NY
Posts: 1
Need help w/Engine knock solution

I picked up a 911 C4 with an engine noise that sounded just like a failed IMS bearing.

Began IMS replacement with engine in car.

Pulled IMS bearing.

Old IMS bearing does not look or feel bad.

Here is my question - Do I install new bearing at this point? Or drop engine and look for another source of the noise. I was expecting to see a noticeably bad bearing, one ready to fall apart but this one looks and feels good.

Any ideas?

BC11 is offline   Reply With Quote
Old 06-20-2015, 10:15 AM   #2
Registered User
Join Date: Feb 2005
Location: It's a kind of magic.....
Posts: 5,396
First of all, attempting to replace an IMS bearing in an engine that you think already has a bad IMS bearing is an very bad idea in and of itself.

If you have a knocking engine, pull it and find out what has failed. Throwing parts at an engine making noise is usually a waste of both money and good parts.
Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein
JFP in PA is offline   Reply With Quote
Old 06-20-2015, 08:51 PM   #3
Engine Surgeon
Join Date: Aug 2008
Location: Cleveland GA USA
Posts: 2,424
Sounds like a failing cylinder. Your location further substantiates this if the car was driven over the winter.
Jake Raby/www.flat6innovations.com
IMS Solution/ Faultless Tool Inventor
US Patent 8,992,089 &
US Patent 9,416,697
Developer of The IMS Retrofit Procedure- M96/ M97 Specialist
Jake Raby is offline   Reply With Quote
Old 06-20-2015, 09:53 PM   #4
Need For Speed
KRAM36's Avatar
Join Date: Feb 2013
Location: Funville
Posts: 2,112
Originally Posted by Jake Raby View Post
Sounds like a failing cylinder. Your location further substantiates this if the car was driven over the winter.
This has me curious. I've always had somewhat of what one would think is a knock in the engine. I always attributed this to the "well oiled sewing machine" sound statements that float around here. It's done it since the day I have bought it, 97k miles to 118k miles. Listed to some youtube vids and believe I hear the same sound coming from those engines. Seems more prominent to the drivers side, is this not normal? Zero metal in the oil filter or magnetic drain plug.

Last edited by KRAM36; 06-21-2015 at 03:22 PM.
KRAM36 is offline   Reply With Quote

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On

All times are GMT -8. The time now is 07:27 AM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2020, vBulletin Solutions, Inc.
Content Relevant URLs by vBSEO 3.6.0
Copyright 2018 Pelican Parts, LLC - Posts may be archived for display on the Pelican Parts Website -    DMCA Registered Agent Contact Page