Vehicle recall 78V032000 · February 9, 1978

Mack DM, R and 1 more model

The synflex-type oil pressure signal line may have been routed too close to the exhaust manifold.

Source: NHTSA data as of September 22, 2026. Last refreshed Sep 23, 2026, 2:43 AM UTC.

Summary: The synflex-type oil pressure signal line may have been routed too close to the exhaust manifold. Excessive heat may cause the line to rupture, and oil leakage may occur.
Remedy: The dealer will reroute the oil pressure signal line to eliminate potential fire hazard, without charge to owner.
Notes: Vehicle description: trucks equipped with V-8 engines.system: engine; oil pressure signal line.consequences of defect: if oil is sprayed onto the hot exhaust manifold, avehicle fire and personal injury to occupants could result.

Recall details

NHTSA campaign: 78V032000
Reported to NHTSA: February 9, 1978
Filed by: MACK TRUCKS, INCORPORATED
Owner notification: October 26, 1978
Vehicles potentially affected: 459
Initiated by: the manufacturer
Components: Engine and engine cooling › Engine › Gasoline

Recall 78V032000 on nhtsa.gov, with the manufacturer’s documents

Vehicles covered

As listed by NHTSA. A recall usually covers only some vehicles of each model and year, often a production date range.

Mack DM (1976-1977): 1977, 1976
Mack R (1976-1977): 1977, 1976
Mack RD (1976-1977): 1977, 1976

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