Technical product information
Topic
Market
area
Brand
Transaction
No.
Level
Status
Release
date

V8 Kovomo - Engine misfires - Engine management light illuminated within the DIP
Russische Föderation (5RU),Australia E04 Bentley rest Asia and Australia (6E04),China 796 VW Import Comp. Ltd (Vico), Beijing
(6796),Germany E02 Bentley rest Europe (6E02),Japan E03 Bentley Japan (6E03),Korea, (South) E08 Bentley South Korea
(6E08),United Arab Emirates E06 Bentley Middle East and Africa (6E06),United Kingdom E01 Bentley UK (6E01),United States
E05 Bentley USA and rest America (6E05)
Bentley
2071668/1
EH
Released for publishing
28-Sep-2023

New customer code
Object of complaint
engine -> engine operation -> engine refinement
engine -> emission control
engine -> engine operation -> power development -> engine power
engine -> engine operation -> cylinder management

Complaint type
Position
functionality -> misfire
control units, services
functionality -> uneven
functionality -> without function / defect

Vehicle data
V8 Kovomo engine
Sales types
Type
3S32CB
3S32CB
3S32CB
3S32CB
3S32CB
3S34CB
3S34CB
3S42CB
3S42CB
3S42CB
3S42CB
3S42CB
3S44CB
3S44CB
4V14D9
4V14D9
4V14D9
4V14D9
4V14D9
4V14D9
4V14D9
ZG22CB
ZG22CB
ZG22CB
ZG22CB
ZG24CB
ZG24CB
ZV14D9
ZV14D9

INTERNAL

MY
2020
2021
2022
2023
2024
2023
2024
2020
2021
2022
2023
2024
2023
2024
2018
2019
2020
2021
2022
2023
2024
2020
2021
2022
2023
2023
2024
2023
2024

Brand Designation Engine code Gearbox code Final drive code
E
*
*
*
E
*
*
*
E
*
*
*
E
*
*
*
E
*
*
*
E
*
*
*
E
*
*
*
E
*
*
*
E
*
*
*
E
*
*
*
E
*
*
*
E
*
*
*
E
*
*
*
E
*
*
*
E
*
*
*
E
*
*
*
E
*
*
*
E
*
*
*
E
*
*
*
E
*
*
*
E
*
*
*
E
*
*
*
E
*
*
*
E
*
*
*
E
*
*
*
E
*
*
*
E
*
*
*
E
*
*
*
E
*
*
*

Documents
Document name
master.xml

INTERNAL

Technical product information
V8 Kovomo - Engine misfires - Engine management light illuminated within the DIP

Transaction No.: 2071668/1
Release date: 28-Sep-2023

Customer statement / workshop findings
•

Engine misfiring

•

Engine running rough (not refined)

•

Engine misfire DTC’s evident

•

Engine management light illuminated within the DIP

•

Knocking noise from the cylinder head (NOTE: The noise can be evident on either bank)

IMPORTANT: The symptoms described are typically evident during early life stages of vehicle use (between 100Km and
250Km)

Technical background
VERY IMPORTANT: Before continuing with the onward instructions the operative should confirm if the following VIN
applicable Service Campaign is listed within Elsa pro
•

EC24 - V8 Kovomo - New Continental GT/GTC and New Flying Spur - Valve spring replacement (SC21/41

Or
•

EC25 - V8 Kovomo - Bentayga - Valve spring replacement (SC21/42)

In the event the VIN applicable Service Campaign is required and the symptoms listed within this TPI are evident the
operative MUST carry out the diagnosis process within the Measure section to completion before conducting the VIN
applicable Service Campaign
The operative MUST raise a new Technical DISS query or respond via the already open DISS query and await feedback from
Product Support before conducting any further work as further information will be requested back which may change the
method of repair
However
In the event the VIN applicable Service Campaigns are not applicable the operative should carry out the onward instructions
within the Measure section to completion

Production change
Not applicable

Measure
VERY IMPORTANT: Before continuing with the onward instructions the operative should confirm if the following VIN
applicable Service Campaign is listed within Elsa pro
•

EC24 - V8 Kovomo - New Continental GT/GTC and New Flying Spur - Valve spring replacement (SC21/41

Or
•

EC25 - V8 Kovomo - Bentayga - Valve spring replacement (SC21/42)

In the event the VIN applicable Service Campaign is required and the symptoms listed within this TPI are evident the
operative MUST carry out the diagnosis process within the Measure section to completion before conducting the VIN
applicable Service Campaign
The operative MUST raise a new Technical DISS query or respond via the already open DISS query and await feedback from
Product Support before conducting any further work as further information will be requested back which may change the
method of repair
However

INTERNAL

In the event the VIN applicable Service Campaigns are not applicable the operative should carry out the onward instructions
within the Measure section to completion
Compression test (All 8 cylinders)
1) Ensure all 8 cylinders are compression tested, the results MUST be photographed and recorded IMPORTANT: This action is an
essential element of the investigation

Cylinder leakage test (All 8 cylinders)
2) Ensure all 8 cylinders are leak tested, the results MUST be photographed and recorded IMPORTANT: This action is an essential
element of the investigation
Once a cylinder has been identified as having low compression and/or cylinder leakage issues, the operative MUST conduct
the remaining steps to completion
NOTE: In the event that the compression and leak down tests show no obvious issues and the results for each cylinder are to
specification
And
Misfires are still evident, please raise a new DISS query or respond via the already open DISS query
IMPORTANT: Await feedback from product support before conducting any further work
3) Referring to Rep.Gr 27 - Disconnect the battery
The next part of the process requires the engine rotating by hand, please ensure the engine is rotated in a clockwise
direction (Normal direction of rotation)
NOTE: A second operative is required to manually rotate the engine clockwise whilst the valve operation of the suspected cylinder is closely
monitored, a borescope is required to check the operation of each valve and piston surface condition within the suspected cylinder
4) Whilst the engine is rotated by hand - Record a clear video capturing the operation of each valve from the suspected cylinder IMPORTANT:
Ensure any irregular valve operation is clearly captured within the video
•

Using the borescope the operative must check for any signs of piston to valve contact and piston related damage

•

Referring to the applicable Rep.Gr - Remove the CDA solenoid which operates the CDA of the suspected cylinder

•

Using the borescope - Inspect inside the CDA solenoid orifice, check for any signs of broken valve spring(s) IMPORTANT: Where possible
capture photos of valve spring(s)

TIP: In the event that the valve spring cannot be inspected through the CDA solenoid orifice, the operative should raise a new DISS query or
respond via an already open query
5) On completion of the diagnosis process, the operative should raise a new DISS query or respond via an already open query ensuring all
requested information is attached as follows:
•

Clear video and photos of valve operation from the suspected cylinder

•

Clear video and photos showing piston to valve contact/piston related damage from the suspected cylinder

•

Clear video and photos of any broken valve spring(s)

VERY IMPORTANT: Await feedback from Product support before conducting any further work
In the event the DISS query requests the operative to replace the engine, after removal of the original engine the operative
MUST conduct the following:
•

Remove the affected cylinder head

IMPORTANT: DO NOT discard the cylinder head as this may be requested back for analysis as per the normal parts return
process
The remaining part of the engine should be discarded as per all local environmental guidelines
•

Referring to Figure 1 - Take clear photos of the broken valve spring (from the affected cylinder head only)

VERY IMPORTANT: Ensure the photos show the location in which the valve spring is broken (ARROW) the various paint markings should also

INTERNAL

be captured

Figure 1
•

Attach all photos to the open DISS query

•

Attach the new replacement engine number to the DISS query

Warranty accounting instructions
In cases where the engine is replaced for this complaint and the cylinder head(s) are requested to be removed and returned to Crewe, the
following additional labour time may be claimed as part of the engine replacement claim

Bentayga
Time to remove Bank 1 cylinder head
Labour
Labour operation code 15 70 21 99
Time
220 TU
Time to remove Bank 2 cylinder head
Labour
Labour operation code 15 70 21 99
Time
190 TU
Time to remove Bank 1 and Bank 2 cylinder head
Labour operation code 15 70 21 99
Time
300 TU
New GT/GTC and New Flying Spur
Time to remove Bank 1 cylinder head
Labour
Labour operation code 15 70 21 99
Time
250 TU
Time to remove Bank 2 cylinder head
Labour
Labour operation code 15 70 21 99
Time
190 TU
Time to remove Bank 1 and Bank 2 cylinder head
Labour operation code 15 70 21 99
Time
300 TU

INTERNAL