International Engine >> OIL LEAKAGE PAST CRANKSHAFT REAR MAIN OIL SEAL
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International Engine >> OIL LEAKAGE PAST CRANKSHAFT REAR MAIN OIL SEAL
Severe Oil Leakage On
Navistar (International) V-304, V-345 & V-392 Engines
A limited number of V-304, V-345 & V-392 Navistar (International) truck engines have been built with the oil return hole in No. 5 main bearing cap omitted. The omission of the oil return hole will create a high pressure area resulting in oil leakage past the rear crankshaft oil seal.
If such a leak is found and normal seal life has not been realized, check the No. 5 main bearing cap for omission of the oil return hole. If the hole is omitted, remove the No. 5 main bearing cap and drill a 3/8 diameter hole into the oil return cavity as per illustration.
The AERA Technical Committee
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