An oil gallery is a drilled or cast channel inside an engine block or cylinder head that routes pressurized lubricating oil to critical moving parts. The main oil gallery runs the length of the block, feeding the main bearings, camshaft, and lifters. If a gallery becomes clogged with sludge or debris, the downstream components will rapidly fail from oil starvation.
Heard on the job
We need to pull the core plugs and brush out the main oil gallery before sending the block to the machine shop.
Also heard as
- oil gallery
- oil passage