Countries: CANADA, MEXICO, UNITED STATES Document ID: 1K1201490

e Availability: ISIS, Bus ISIS, FleetISIS, NofSIR Revision: 1
" 0 W Major System: | ENGINE Created: 2/28/2024
Current Language: English Last Modified: 9/18/2025

Knowledge Base Other Languages: NONE Author: Gintarus Andriusis
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Title: PSI 8.8L Camshaft Inspection and Repair vs Engine Replacement

Applies To: PSI 8.8L LPG and Gasoline Engines

Change Log

Please refer to the change log text box below for recent changes to this article:

109/18/2025 - Added additional pictures for clarification on camshaft bearings as well as added step 9 for Crankshaft scoring check
{03/11/2024 - Initial Article Release.

Description

The purpose of this article is to provide updated guidance regarding PSI 8.8L engine repair versus engine replacement. When a camshaft or
lifter(s) have failed, technicians should pursue the engine repair process, following the inspection guidelines below, instead of engine
replacement.

***NOTE*** This article is only to be followed if there is suspicion of internal engine damage.

Symptoms

Diagnostic Trouble Codes & Dashboard Indicator Lights:

DTC/Light

1322-31 mrancom/Multiple Cylinder Misfire
1323 - 31 Cylinder 1 Misfire Detected
1324-31 Cylinder 2 Misfire Detected
1325-31 Cylinder 3 Misfire Detected

1326 - 31 Cylinder 4 Misfire Detected

1327 - 31 Cylinder 5 Misfire Detected

1328 - 31 Cylinder 6 Misfire Detected

1329 - 31 Cylinder 7 Misfire Detected

1330 - 31 Cylinder 8 Misfire Detected

Customer Observations or Concerns:

e Low power complaints
e Rough running
e Misfire condition
e Abnormal engine noises
e No start condition/engine lock-up

Special Tools / Software

Tool Description Tool Number Comments Instructions
Not Applicable
Service Parts Information
Kit Description Part Number Required Notes
Hydraulic Valve Lifter PSI80000145 16
Camshaft 2516875C1 / 80000923 1
Oil Filter and Oil
Replace any other damaged or one- example: bent push rods,
time-use components gaskets used for reassembly

Diagnostic Steps

Step

Action

Decision

DIAGNOSTIC:

Identify if there is potential for internal engine
damage with possible conditions of:

Misfires, Rough Running, Knocking/Abnormal

Yes: Go to Step 2

1 Engine Noises, No Start/Engine Lock-Up
No: Follow available PSI diagnostics to determine
YES/NO QUESTION? the root cause of the condition present
Is there suspicion of internal engine damage and
have other engine performance-based diagnostics
been completed?
Step] Action Decision
DIAGNOSTIC: Yes: Go to Step 4
Verify if the engine can be rotated by the starter
2
YES/NO QUESTION?
/NO Q No: Go to Step 3
Does the engine crank and/or start with the key in
the crank position?
Step] Action Decision

DIAGNOSTIC:

Verify if the engine can be rotated by hand

Yes: Follow diagnostics for the no-crank condition
in the PSI diagnostics manual

3
YES/NO QUESTION? No: Go to Step 6
Can the engine be rotated manually?
Step] Action Decision
DIAGNOSTIC: Yes: Go to Step 6
Perform and record values for Cylinder
Compression test following PSI 8.8L engine
4 manual
YES/NO QUESTION? No: Go to Step 5
Is the Engine Compression Test within
specification?
Step] Action Decision
DIAGNOSTIC: Yes: Go to Step 6
Perform and record values for the Cylinder
Leakdown Test following the PSI 8.8L engine
5 6 8 No: Open a Technical Support casefile and provide
manual :
the recorded values from the compression test
YES/NO QUESTION? and leak-down test
Is the Leakdown Test within specification?
Step] Action Decision
DIAGNOSTIC: Yes: Go to Step 7
Remove the Intake, Valve Cover, and Valley pan to
verify the condition of the camshaft and valvetrain . . -
6 No: Return engine to operating condition and
YES/NO QUESTION? follow appropriate PSI diagnostics to determine to
cause of abnormal engine operation
Is there any damage observed to the camshaft,
valvetrain, push rods, or lifters?
Step] Action Decision
DIAGNOSTIC: Yes: Go to Step 8
7 Remove the oil pan to inspect for any metal

YES/NO QUESTION?

Is any metal debris found in the oil pan?

No: Go to Step 10

Step] Action Decision

DIAGNOSTIC:
Yes: Go to Step 10

Remove the front and second to last main
bearings for inspection of any metal passing
through

***NOTE*** - Do not remove the most rear

bearing as this may result in an oil leak later in life
No: Go to Step 9

YES/NO QUESTION?

Using Figure 1 and 2 - Are bearings in an
acceptable condition?

Figure 1 - Acceptable

ACCEPTABLE BEARING CONTAMINATION/SCORING

Figure 2 - Not Acceptable

NOT ACCEPTABLE BEARING CONTAMINATION/SCORING

Step] Action Decision

DIAGNOSTIC: Yes: Go to Step 10

Inspect crankshaft journals for damage

YES/NO QUESTION? No: Open a Technical Support casefile and provide
pictures

Using Figures 3 and 4 - Does the crankshaft show
acceptable crankshaft journal condition?

Figure 3 - Acceptable

ACCEPTABLE CRANKSHAFT JOURNAL CONDITION
—

Figure 4 - Not Acceptable

NOT ACCEPTABLE CRANKSHAFT
CONTAMINATION/SCORING

Step] Action Decision

DIAGNOSTIC: Yes: Open a Technical Support casefile and

Inspect camshaft bearings for any damage provide pictures

Follow the available PSI 8.8L Engine manual for

10 the camshaft removal procedure

YES/NO QUESTION? No: Go to Repair Steps below

Using Figures 5 and 6 below, do the camshaft
bearing(s) show any signs of damage?

Figure 5 - Acceptable

EXAMPLES OF ACCEPTABLE CAMSHAFT BEARING

Figure 6 - Not Acceptable |

EXAMPLES OF BAD CAMSHAFT BEARING

Heat Damage Delamination (Exposed copper)

Repair Step(s)

Follow the below steps for the camshaft repair instead of the engine replacement
Repair Direction:

1. Replace camshaft

2. Replace all lifters

3. Replace the oil filter and oil

4. Replace any other damaged or one-time-use components (example: bent push rods, and gaskets used for reassembly)
5. Ensure to inspect oil pickup tube screen for plugging, reference example in Figure 7 below

Figure 7

EXAMPLE OF PLUGGED OIL PICKUP SCREEN

***NOTE*** - Reference supporting information for the link to the PSI Engine Manual and to the PSI Camshaft Repair bulletin
Supporting information:

. PSI 8.8L Camshaft & Lifter Repair Process Bulletin

. 2018 PSI 8.8L Gasoline Engine Diagnostic Manual

. 2019 PSI 8.8L Propane Engine Diagnostic Manual (Gen II)

. 2015 PSI 8.8L Propane Engine Diagnostic Manual (Gen I),

. 2015 PSI 8.8L Propane / 2018 PSI 8.8 Gasoline Engine Service Manual

. 2019 PSI 8.8L Propane Engine Service Manual (Gen Il) (For engine serial numbers starting with 8.8W) (Weichai Block)

NOUR WNP

Warranty Information
Warranty Claim Coding:

Refer to the Warranty Coding Manual for Group and Noun Codes.

Standard Repair Time(s):

Refer to the SRT Manual for Repair Times

Other Resources

Master Service Information Site

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