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SUBJECT VANOS Rattle Noise After Engine Start

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Remove intake manifold as outlined in repair manual group 11 section 11 61 050 . .... Covered under the terms of the BMW New Vehicle Limited Warranty. ...

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SUBJECT VANOS Rattle Noise After Engine StartPage 1GROUP 1111 04 01Woodcliff Lake NJJuly 2001EngineService EngineeringSUBJECTVANOS Rattle Noise After Engine StartMODELE39 M5 and E52 Z8 with S62 engine produced up to 11/30/00.SITUATIONA rattling noise coming from the front of the engine (VANOS area) may be heard for a few secondsafter start up.CAUSEThe VANOS adjusting units may cause a momentary rattling noise after the engine is started due tovarying torque of the camshafts before sufficient VANOS adjustment oil pressure is built up.When the engine is switched off oil bleeds out of the highpressure chamber in the VANOSadjustment cylinder. This can cause the VANOS adjustment piston to move freely against thehousing during engine start up causing the momentary rattling noise.This noise has no effect on engine power output or durability.CORRECTIONM5 and Z8 vehicles produced from 12/1/00 incorporate a VANOS accumulator shutoff valve whichprevents oil bleed off of the highpressure chamber after the engine is switched off.On a customer complaint basis only a VANOS accumulator shutoff valve can be installed toeliminate the momentary rattling noise after the engine is started on vehicles produced before12/1/00.Note: Three VANOS accumulator shutoff valve kits have been developed to accommodate therunning production changes on M5 and Z8 vehicles.Kit part number 11 36 7 832 855 should be used on M5 vehicles produced up to 8/31/00 and11 36 7 832 856 should be used on Z8 vehicles produced up to 9/1/00. These kits include electrical and mechanical componentsfor the VANOS accumulator shutoff valve installation.Kit part number 11 36 7 832 858 should be used on M5 and Z8 vehicles produced from 9/1/00 up to11/30/00. This kit includes mechanical components for the VANOS accumulator shutoff valveinstallation since the wiring harness is already installed during production on these vehicles.Section A of the procedure below outlines the wiring installation instructions needed to install t ...

Source: www.bmwz8.us

 

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