Description
This is the Honda Oil Passage Orifice Assembly for the Honda Acty HA3, HA4 (1990-1999). It is a small calibrated oil restrictor inside the engine block oil passage that controls how much oil flows through, keeping oil pressure and lubrication correct - think of it as a small oil-flow regulator.
In Stock - ships from our California (USA) warehouse
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Vehicle Fitment & Compatibility
Confirm your chassis code against the table below before ordering.
100% Fitment Guarantee
Not sure about fit? Add your chassis/VIN number at checkout and we confirm it before we ship. If a part does not fit your Acty, we exchange it or refund you in full.
Signs you need this oil passage orifice assembly
- Low oil pressure
- A noisy top end on startup
- You are doing an engine rebuild
- A worn or clogged orifice
Features & Function
- Meters oil flow through the engine block passage
- Correct orifice for the E07A
- Restores oil pressure
Installation Specifications
- Difficulty: Advanced.
- Estimated time: part of engine or timing work.
- Required tools: A socket set and engine hand tools.
Oiwa Garage Tech Note
"It installs in the cylinder block oil passage near the lower front of the block, as part of the engine lubrication system. USA Honda catalogs list comparable 15140-series parts as Orifice Assy., Oil Passage or Orifice Assy., Oil Control."
Frequently Asked Questions
What does this part actually do?
It is a calibrated orifice that meters oil flow through a block passage to keep oil pressure and lubrication correct - a restrictor, not a moving pump part.
Where does it install?
In the cylinder block oil passage, near the lower front of the block, as part of the engine lubrication system.
Fitment verified by the Kei truck specialists at Oiwa Garage · Listing updated June 2026.