G0000087 - Engine Failure Analysis Tips

General Service Bulletin (GSB):	Engine Failure Analysis Tips
GSB Overview:	This bulletin supplements Workshop Manual information by providing images of engine failures and tips for preventing repeat occurrences.
NOTE: This information is not intended to replace or supersede any warranty, parts and service policy, Work Shop Manual (WSM) procedures or technical training or wiring diagram information.

Engine Failure Analysis Tips

Guide to Preventing Repeat Engine Failures

Overview

Guide to preventing repeat engine failures

Progression List

Cause

Leading to

Each damaged engine scenario starts by providing some root cause examples

Effect

Leading to

The effects of what can occur if root cause is not addressed or the repair is left incomplete listed here

Damage

End result or damage that can be experienced if root cause of original engine failure is not accurately identified highlighted here

In situations where partial diagnosis suggests engine replacement may be necessary, such as:

Bearing damage
Engine noise
Cylinder misfire
Loss of compression
Metal contamination
Undetermined oil consumption

If the true root cause is not identified (with visual confirmation to the extent of total damage), an over repair or an incomplete repair leading to repeat engine failure may result.

This bulletin targets specific gas engine failure modes and includes a progression list highlighting:

Cause
Effect
Damage

The progression list assists in identifying certain common operational concerns, overlooked contamination scenarios, and incomplete repair possibilities. (see example on left)

Piston Damage

Pre-ignition
Excessive Levels of Detonation
Engine Performance Modifications
Aftermarket Fuel System Modifications

Misfire from Valve Leakage

Excessively Lean Conditions
Excessively High Cylinder Temperatures
Aftermarket Induction Modifications

Cylinder Wall Scuffing & Scoring

Catalyst Material Ingestion

Piston and Valve Damage

Foreign Object Debris

Severe Oil Consumption

Open Breather Tube Fitting in Place of PCV Valve on 2v Modular V8 & V10

Bent Connecting Rod

Hydrolock
Injector Failure
External Water Ingestion

G0000087

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