Mitsubishi / UD Trucks Super Great, Aero ACE and 3 more models Recall 1136651 — Engine

In December 2015, Mitsubishi & UD Trucks filed a statutory recall with Japan's Ministry of Land, Infrastructure, Transport and Tourism (MLIT) concerning the Engine, covering the Super Great, Aero ACE and 3 more models. The filing affects 40,331 vehicles manufactured between March 30, 2010 and July 22, 2015.

Overview

Filing in context

This notification is a joint filing by 2 manufacturers: Mitsubishi & UD Trucks.

The Engine is the most frequently cited component category in this archive, appearing in 72 of its 4,890 filings. This filing is one of 56 Mitsubishi notifications from 2015 in this archive. For scale, 859 of the 4,890 filings in this archive report a larger number of affected vehicles; the vehicles involved here were manufactured over a span of about 5 years and 3 months.

Defect

On engines used in heavy trucks and buses, the engine oil change interval was set without sufficient consideration for severe operating conditions, causing engine oil to degrade earlier than the specified interval under demanding use. Continued operation allows sludge — combustion soot and oil degradation deposits — to accumulate in the oil mist separator, causing a clog. This raises crankcase internal pressure and forces engine oil into the intake system. In the worst case, engine speed may rise unintentionally and the engine may sustain serious damage.

Corrective action

On all affected vehicles: measure crankcase internal pressure; if the oil mist separator is determined to be clogged, replace it with a new unit and replace the engine oil and oil filter. If severe operating conditions are identified, replace the engine oil and oil filter regardless. On vehicles whose engine control software does not include an engine over-speed prevention function, add the corrected over-speed prevention program. Additionally, update the maintenance booklet to specify the oil change interval for severe conditions, and advise owners of the importance of engine oil maintenance.

Affected models & chassis ranges

This filing lists 76 type code(s). A vehicle is affected if its chassis number falls within one of the ranges below.

Original Japanese (MLIT source text)

Source & verification

This entry reproduces public data from Japan's MLIT recall registry. English text is jdmvin.com's own translation; always verify against the official source:

https://renrakuda.mlit.go.jp/renrakuda/ris-detail-car.html?class=recalldatacar&id=3003635

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Filings whose affected type codes overlap with this one, newest first.

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