Oil Leak From Front of Engine on Isuzu Oasis

A seal in the 4 cylinder engine around the balance shaft tends to fall out, causing a large oil leak. There is a retaining device available to prevent the seal from falling out, which can be put in place during routine timing belt maintenance.

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Average mileage: 162,580 (162,580–162,580)
Engines affected: 2.2L 4 Cylinder, 2.3L 4 Cylinder
4 model years affected: 1996, 1997, 1998, 1999
6 people reported this problem
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problem details
1999 Isuzu Oasis - 2.3L 4 Cylinder
i havent gotten it fixed as of yet but what causes this
1996 Isuzu Oasis - 2.2L 4 Cylinder 162,580 mi,
I'm having this problem currently andnot sure what to do...