AD 51-26-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Continental Motors | E185-1 | CONTINENTAL Model E185 Engines |
| engine | Continental Motors | E185-10 | CONTINENTAL Model E185 Engines |
| engine | Continental Motors | E185-11 | CONTINENTAL Model E185 Engines |
| engine | Continental Motors | E185-2 | CONTINENTAL Model E185 Engines |
| engine | Continental Motors | E185-3 | CONTINENTAL Model E185 Engines |
| engine | Continental Motors | E185-5 | CONTINENTAL Model E185 Engines |
| engine | Continental Motors | E185-8 | CONTINENTAL Model E185 Engines |
| engine | Continental Motors | E185-9 | CONTINENTAL Model E185 Engines |
Unsafe Condition
Valve failures caused by partially deflated hydraulic valve lifters due to insufficient oil flow and improper valve lash.
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Required Actions
Inspect and modify the engine to ensure proper oil flow to the lifters and zero valve lash. This may involve partial engine disassembly or a special test to check oil feed hole alignment. Enlarge incorrectly drilled oil feed holes and replace pushrods with 1/16-inch diameter holes if existing holes are 1/32-inch.
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Compliance Time
To be accomplished as soon as possible, but not later than January 1, 1952.
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Affected Aircraft
Continental Motors Model E185 Engines serially numbered 2600 and below, not major overhauled since November 1, 1947 (Continental Motor Corp.) or July 1, 1948 (Field Overhaul Agencies).
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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