2054888.2

Technical product information
Topic
Market area
Brand
Transaction No.
Level
Status
Release date
Lateral valve guide - Diagnosis requirements - W12 engine only
Bentley: worldwide (2WBE)
Bentley
2054888/2
EH
Approval
New customer code
Object of complaint
engine -> engine operation
engine -> engine operation
engine -> starter, ignition system, preheater system
engine -> engine operation -> engine refinement
Complaint type
Position
noise, vibration
functionality
functionality
functionality -> misfire
Vehicle data
Continental Series W12 and Flying Spur W12
Sales types
Type
39*1**
39*1**
39*1**
39*1**
39*1**
39*1**
39*1**
4W21**
4W21**
4W21**
4W21**
4W21**
MY
2012
2013
2014
2015
2016
2017
2018
2014
2015
2016
2017
2018
Brand Designation Engine code Gearbox code Final drive code
E
*
*
*
E
*
*
*
E
*
*
*
E
*
*
*
E
*
*
*
E
*
*
*
E
*
*
*
E
*
*
*
E
*
*
*
E
*
*
*
E
*
*
*
E
*
*
*
Documents
Document name
master.xml
INTERNAL
Technical product information
Lateral valve guide - Diagnosis requirements - W12 engine only
Transaction No.: 2054888/2
Customer statement / workshop findings
Customer reports misfires/check engine warning lamp illuminated within the Drivers Instrument Panel (DIP)
Technical background
The Retailer Must ensure that TPI 2051187/- Poor Engine Running Complaints (Misfires) has been conducted, the
instructions within the Measure section of this TPI must only be conducted when All other methods of misfire diagnosis have
been conducted as detailed within TPI 2051187/You must ensure that all compression and cylinder leak down results are attached in the event that lateral valve guide wear
is evident
Hint: Please also refer to the video located on the Bentley Hub reference TPI 2054888/-
Production change
Not applicable
Measure
Lateral valve guide diagnosis
The use of safety glasses is recommended for the duration of this procedure
Prior to carrying out the lateral valve guide check, the operative must ensure that the fuel system is fully depressurised as
per Rep.Gr 20 Fuel system - To depressurise
The operative must ensure that all safety precautions regarding depressurising the fuel system are strictly adhered to
CAUTION: No fuel should be present in any of the fuel lines or hoses
1) Remove the applicable cylinder head camshaft cover - Refer to Repair manual - Rep.Gr 15 IMPORTANT: Should only one cover require
removal for example Bank 1 it is imperative the electrical connections are disconnected from all of the ignition coils on Bank 2
•
A second operative is required to film/record the movement of the valves whilst the engine is being rotated
•
The engine should be rotated by the starter motor
2) Whilst the engine is being rotated the operative must use a recording device which has a slow motion video function, please refer to the
attached video within this TPI which shows an example of what is expected from the video as regards quality and content
3) Should lateral valve guide wear be identified the retailer should raise a DISS query
IMPORTANT: You must ensure that all compression and cylinder leak down results are attached within the DISS query in the event that lateral
valve guide wear is evident. The video showing lateral valve guide wear should also be included/attached to the DISS query
INTERNAL