Manufacturer communication — 2006 GMC YUKON DENALI XL

Fitment confirmedReporter type: ManufacturerENGINE

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

PIP5163C ・ fault and correction ・ for GM vehicles in general

Applies to

Applies to all models and engines, 2000 - 2018.
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All All 2000 - 2018 All All All All

Fault

An engine block is suspected of cylinder bore damage, scoring or out of round as the cause of 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

Steps to confirm (in the document’s order)

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 bore has areas where the cross hatch is missing or worn; if there is crosshatch all the way around the bore from top to bottom, the bore is not out of round.
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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.
Dirt intrusion: if the air filtering system was compromised the engine wears out very quickly; grit is found in the intake runners and the bores look lightly sand blasted.
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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 the brick is broken the dust can be drawn back into the engine, and the bores look sand blasted.
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Catalytic Converter failure- If a converter fails and the brick is broken, the dust can be drawn back into the engine. A block showing this type of failure, will have bores that look to be sand blasted.

Correction

Repair

With converter dust the back cylinders go first if caught early; otherwise there is no crosshatch left 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 machined out of round for any engine family in recent history.
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GM has not had an issue with cylinders being machined out of round for any engine family in recent history.
An oversize cylinder can only be confirmed by checking with an air gauge at the engine plant.
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Even if a cylinder is suspected of being oversize we can only confirm that by checking with an air gauge at the engine plant.

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、シリンダリーク、またはブローバイの原因となる可能性があるシリンダボア損傷、スコアリング、または真円度不足に関する情報を技術者に提供するものです。技術者はシリンダ損傷またはスコアリング、真円度不足のシリンダボア、ダート侵入、およびキャ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.
Go to this passage in the original

Source

Source: NHTSA Manufacturer Communications
Source reference: 10137727
Received by source: 2018-05-21
Incident date: Unknown

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