Mitsubishi / UD Trucks Fighter, Aero Star and 3 more models Recall 1135470 — Engine (General)

In April 2015, Mitsubishi & UD Trucks filed a statutory recall with Japan's Ministry of Land, Infrastructure, Transport and Tourism (MLIT) concerning the Engine (General), covering the Fighter, Aero Star and 3 more models. The filing affects 20,328 vehicles manufactured between May 28, 2010 and February 16, 2015.

Overview

Filing in context

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

The Engine (General) is the most frequently cited component category in this archive, appearing in 48 of its 4,890 filings. This filing is one of 56 Mitsubishi notifications from 2015 in this archive. For scale, 1,235 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 4 years and 8 months.

Defect

On medium trucks and medium-to-large buses, the seat gasket inside the air compressor — which maintains the seal between the coolant passage and the air passage — has insufficient strength. Pressure vibration from piston reciprocation causes cracks to form in the gasket, allowing coolant to enter the air passage. This produces two failure modes: (1) During air delivery, coolant travels through the lines and is expelled through the compressed air dryer (which removes moisture and oil from compressed air), reducing coolant level and illuminating a warning light. Continued operation limits engine output. (2) Heat generated during air compression evaporates the coolant, leaving crystallized solids that deposit on the intake and discharge valves, reducing airflow and causing air pressure to drop. A warning buzzer sounds and a warning light illuminates. Continued operation prevents adequate air pressure from being maintained, impairing brake function and potentially leaving the vehicle inoperable on the road.

Corrective action

On all vehicles, replace the complete air compressor head assembly with a corrected part and perform the following additional remedies: on units where coolant intrusion is confirmed in the head air passage, replace the air compressor piston and cylinder liner with new parts and overhaul the air dryer; inspect the air system and, where coolant contamination is found, clean the air system and replace any affected components with new parts.

Affected models & chassis ranges

This filing lists 49 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=3003503

Related recalls

Same manufacturer, same component

Other Mitsubishi filings involving the Engine (General), closest to this one by filing date.

Other recalls affecting the same models

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

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