Drain Back Holes Must Be Drilled In 238-2703 Pistons When Used In Lightly Loaded Marine Auxiliary Engines
Usage:
CONFIDENTIAL TIBU4190-00
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TECHNICAL INFORMATION BULLETIN |
April 28, 2004 |
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Marine Engines |
3304B (3TC,1PS,83Z) 3306B (1CZ,1RS,8JJ) (85Z,9NR) Generator Sets PGDE300 (8NS) Generator Sets |
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Component Code(s) 1214 |
SUBJECT: Lightly Loaded Marine Auxiliary Engines may require Machining Drain Back Holes in the Oil Ring Groove to maintain Oil Control
PROBLEM:
238-2703 pistons do not have drain back holes machined into the oil ring groove. These drain back holes allow for proper oil control in light load marine auxiliary conditions.
SOLUTION:
Drill four 2.4mm (0.095") holes in the oil ring groove into the cavity of the piston as shown below.
NOTE: Use the same dimensions to drill holes 180 across from the holes shown in the graphic below.
The Illustration shows the location and dimensions to add 4 oil drain back holes in the 3300 pistons.
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