Manufacturer communication — 2006 GMC YUKON DENALI XL

Fitment confirmedReporter type: ManufacturerENGINE AND ENGINE COOLING

Relation to the target vehicle

The source's vehicle field includes the trim.

Model year: Match 2006 — Source vehicle field
Model: Match YUKON DENALI XL — Source vehicle field
Trim: Match Denali — Source vehicle field

What the manufacturer’s document says

PIP5163A ・ fault and correction ・ for GM vehicles in general

Applies to

Applies to 2015 and prior GM passenger cars and trucks.
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2015 and Prior GM Passenger Cars and Trucks

Fault

The engine block is suspected of cylinder bore damage, scoring or out of round as the cause of engine oil consumption, misfire, cylinder leakage or blow by.
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Suspecting an engine block of possible cylinder bore damage, scoring or out of round as the possible cause of engine oil consumption, misfire, cylinder leakage or blow by.

Finding the cause

Possible causes

Dirt intrusion: if the air filtering system has been compromised the engine wears out very quickly; there is grit in the intake runners and the cylinder bores look lightly sand blasted.
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3. Dirt intrusion- If the filtering system has been compromised the engine will wear out very quickly. You will find grit in the intake Runners and the cylinder bores will look lightly sand blasted.
Catalytic converter failure: if a converter fails and the brick is broken, the dust can be drawn back into the engine.
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4. Catalytic Converter failure- If a converter fails and the brick is broken, the dust can be drawn back into the engine.

Steps to confirm (in the document’s order)

The peak to valley specification for the crosshatch is .65-2.8 microns; with any deviation the crosshatch will be gone.
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The peak to valley spec for crosshatch is .65-2.8 microns. Any deviation and the crosshatch will be gone.
Cylinder damage or scoring: the cylinder walls have grooves deep enough to catch with a finger nail.
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1. Cylinder damage or scoring- the cylinder walls will contain grooves deep enough to catch with a finger nail.
An out of round cylinder bore has areas where the cross hatch is missing or worn in different sections of the bore.
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2. An out of round cylinder bore- will contain areas where the cross hatch is missing or worn from different section of the cylinder bore.
If there is crosshatch all the way around the bore from top to bottom, the cylinder bore is not out of round.
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If there is crosshatch all the way around the bore from top to bottom the cylinder bore is not out of round.

Correction

Repair

With converter dust the back cylinders go first if caught early; otherwise there is no crosshatch and the engine needs to be replaced.
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Back cylinders go first if caught early. Otherwise there will be no Crosshatch and the engine will need to be replaced.

Caution

GM has not had an issue with cylinders being machined out of round for any engine family in recent history.
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Note: GM has not had an issue with cylinders being machined out of round for any engine family in recent history.

Compiled by reading the full text of the document; each point stands on the passage shown. Check the document itself, linked below, before working on a vehicle.

Stated content

Communication summary
本予備情報通知は、エンジンオイル消費、ミスファイア、シリンダーリーク、またはブローバイの原因となる可能性があるエンジンブロックのシリンダーボア損傷、スコアリング、またはアウトオブラウンドの可能性についての情報をテクニシャンに提供します。テクニシャンはシリンダー損傷またはスコアリング、アウトオブラウンドのシリンダーボア、ダート侵入、およびカタリティックコンバーター故障についてエンジンを点検する必要があります。 Machine translation (unreviewed)
This Preliminary Information communication provides information to the technician about engine block of possible cylinder bore damage, scoring or out of round as the possible cause of engine oil consumption, misfire, cylinder leakage or blow by. Technician will need to inspect the engine for Cylinder damage or scoring, An out of round cylinder bore, Dirt intrusion, and Catalytic Converter failure.
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Source

Source: NHTSA Manufacturer Communications
Source reference: 10112116
Received by source: 2017-08-15
Incident date: Unknown

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