Engine and Gearbox Casing Leak Repair
Oil-weeping engine and gearbox casing sealed and rebuilt with a machinable composite, no machining or housing replacement.
What was failing
An engine and gearbox casing was weeping oil from a cracked housing and a worn bearing-cap bore, and the split-line face no longer sealed clean. Once a casting cracks and a bore wears, the cover cannot pull up tight and the bearing no longer seats square, so oil keeps finding its way out and the leak gets worse with running. Left alone, the seep contaminates the surroundings and threatens the bearing, and the usual fix means line-boring the housing or replacing the casting outright, both of which take the unit out of service for a long stretch.
How AAS approaches it
We start by stopping the seep so the cracked area and the worn bore can be cleaned down to oil-tolerant condition for a sound bond. Then we rebuild the crack, the worn bearing-cap bore, and the split-line face with a machinable composite that cures cold with no heat. We dress the bore and the face back to fit so the cover pulls up tight and the bearing seats square. The result is a sealed casing back in service, with no machining of the housing and no replacement casting.
Assess and stop the seep
We inspect the cracked housing, the worn bearing-cap bore, and the split-line face, and stop the active weep so the area can be worked.
Surface preparation
We clean the cracked area, the bore, and the split-line face down to a sound, oil-tolerant surface so the composite bonds.
Rebuild the casting and bore
We rebuild the crack, the worn bearing-cap bore, and the split-line face with a machinable composite, working cold with no welding or distortion.
Dress back to fit
We dress the bore and the split-line face back to fit so the cover pulls up tight and the bearing seats square.
Reseal and return to service
We confirm the repair is sound and seals, then hand the casing back ready to run.
The result
From the job
Repair and protection work of this kind, performed by AAS crews across Louisiana.
Capabilities used here
Where this work happens
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