IK1201410 ­ A26 Rocker Arm Inspection and Replacement Guidelines

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Countries:

CANADA, UNITED STATES Document ID: IK1201410

Availability:

ISIS, IsSIR

Revision:

29

Major System:

ENGINES

Created:

2/14/2018

Current Language: English

Last Modified: 6/29/2018

Other Languages: Français,

Author:

Viewed:

Greg Scheff

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Title : A26 Rocker Arm Inspection and Replacement Guidelines
Applies To : A26 Engines built prior to 4-4-2018 with Engine Serial Number 4505507 and below

CHANGE LOG
Please refer to the change log text box below for recent changes to this article:
06/29/2018 - Feedback Response on necessity of accurate measurements vs go no-go gauges
06/27/2018 ­ French translation added.
06/19/2018 - Added graphic showing measurement location, added ESN and engine build date information
06/15/2018 - Feedback Response, clarification on oil change recommendation. Added link for Camshaft reusability iKNow article.
05/30/2018 ­ Feedback Response

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DESCRIPTION
This document will guide the user through rocker arm inspection and replacement guidelines for the A26 and N13 engine. The instructions below will help to
identify any premature roller pin wear (Figure #1). This document also provides reusability guidelines for the camshaft and roller follower assemblies.

Figure #1: Example of excess roller pin wear

SYMPTOM(s)
Diagnostic Trouble Code(s) & Dashboard Indicator Light(s):
Below are some POSSIBLE DTC's that may be present. NOTE that there may not always be codes present with a roller pin wear issue.
DTC/Light

Description

SPN 1322 FMI 14

Engine misfire for multiple cylinders

SPN 188 FMI 18

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IK1201410 ­ A26 Rocker Arm Inspection and Replacement Guidelines

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Engine Speed at idle, Point 1: Data
valid but below normal operating range

Customer Observations or Concerns:
The customer may experience some or all of the following conditions:
Check engine light
Misfire and running rough
Trouble idling or stalling
Ticking noise heard in the top of the engine

SERVICE PARTS INFORMATION

Kit Description

Part Number

Quantity

ARM ASSY ROCKER INTAKE & EXH

62042006057

As
Needed

ARM ASSY ROCKER INTAKE

62042016195

As
Needed

ARM ASSY ROCKER EXHAUST

62042016196

As
Needed

3007627C1

As
Needed

VALVE BRIDGE, INTAKE

62041200019

As
Needed

Also used on exhaust side for
engines WITHOUT Engine
Brakes

SEAL, UPPER VALVE COVER

3018366C2

As
Needed

**See Reusability Notes Below

SEAL, LOWER VALVE COVER BASE

3018365C2

As
Needed

**See Reusability Notes Below

ASSEMBLY, ENGINE CAMSHAFT

3016477C1

As
Needed

KIT, OIL FILTER

3007498C94

As
Needed

VALVE BRIDGE, EXHAUST SIDE WITH
ENGINE BRAKE

Notes

REPAIR STEP(s)

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IK1201410 ­ A26 Rocker Arm Inspection and Replacement Guidelines

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____________________________________________________________________________________________________________________________________________

INITIAL DATA COLLECTION FROM THE VEHICLE
1. Retrieve a current Health Report using either HeRo or Accelerator Tablet
• For HeRo - See IK2700079
• For Accelerator ­ See IK2700102
2. Note if any operational complaint is present such as rough running, misfire, or if any ticking noise is heard from the top end.

INSPECTION GUIDELINES
3. Remove the valve cover.

Figure #2: Rocker Arm Date Code Locations

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4. Engines WITHOUT Engine Brakes - record intake and exhaust rocker arm date codes (Figure #2) onto the linked Measurement Worksheet (See figures
#5 and #6 for examples), then proceed to step 6.
5. Engines WITH Engine Brakes - Perform measurements outlined in step 6 and 7 first. If rocker arm replacement is needed, the date codes can be
recorded once the engine brakes are off for rocker arm replacement.
• INTAKE Date Format will be 6195 / XXXX
• EXHAUST Date Format will be 6196 / XXXX

Figure #3: Component Identification
Item 1: Rocker Arm Forging Fork
Item 2: Base Circle of Camshaft
Item 3: .090" (2.3mm) Feeler Gauge

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Figure #4: Location to Measure Clearances
Location 1: Rocker arm FORGING fork to base circle of camshaft

6. Rotate the engine so the roller is against the base circle of the camshaft (Figure #3 Item 2) and the valves are closed. Spin each roller by hand at least
one full revolution to check for any binding.
• Roller spins freely - Continue to step 7.
• Roller sticks and does not spin freely - Replace the individual rocker arm and mark it as to it's location on the engine and continue to the next rocker arm.

7. While still on the base circle of the camshaft, apply light downward pressure on the forging (Figure #3 Item 1) at the roller end of the rocker arm. Using a
feeler gauge (Figure #3 Item 3) measure the clearance between the base circle of the cam, and the rocker arm forging "fork" (Figure #4 Location 1). DO
NOT measure between the roller itself and the camshaft lobe. Record the results onto the linked Measurement Worksheet. Be certain to record the actual
measured value (Figures #6).
• NOTE: It is acceptable to stack feeler gauges to obtain the desired measurement thickness. Example, combining a .029",.030" and .031" feeler gauge
equals the desired .090".
• NOTE: Only one measurement location is required.
8. The minimum gap measured at figure #3, location 1 should be NO LESS than 0.090" (2.3mm).
9. If any are found to be out of specification, ONLY replace the individual intake or exhaust rocker arm as needed based on measurement results.
10. If any cam lobes or rollers are found to be questionalble during the inspection, please see IK1201416 Camshaft and Roller Follower Reusability
Guideline linked below.

____________________________________________________________________________________________________________________________________________

MEASUREMENT WORKSHEET EXAMPLES
Below are examples of correct and incorrect data provided in the measurement worksheet

The measurement data worksheet is REQUIRED to be attached to the case
file or warranty claim. These critical measurements are needed for accurate
failure analysis investigations. Failure to provide accurate data may delay
claim payment.

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Figure #5: Example of INCORRECT Measurement Documentation
In this example measurement fields only indicate pass or fail. Other examples of incorrect documentation may be