Description
This oil filler cap fits the Honda Acty Truck & Van HA1, HA2, HA3, HA4, HH3, HH4 (1990-1999). It seals the engine oil filler opening, which on the Acty is reached behind the passenger-side rear wheel fender flap.
In Stock - ships from our California (USA) warehouse
Fast, reliable delivery - no overseas backorder wait.
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.
Reasons to choose this oil filler cap
- A cracked or hardened cap seal
- Oil weeping from the filler neck
- A missing cap
Features & Function
- Seals the valve-cover filler opening
- Correct fit for the Acty engine
- Stops filler-neck weeping
Installation Specifications
- Difficulty: Easy.
- Estimated time: a minute or two.
- Required tools: No tools.
Oiwa Garage Tech Note
"If the old cap seal is hard and shiny, the crankcase pressure is pushing past it - a fresh cap seals the filler and keeps oil off the engine."
Frequently Asked Questions
How do I know the filler cap seal is bad?
If the cap seal is hard and shiny and you see oil weeping at the filler neck, crankcase pressure is pushing past it. A fresh cap with a good seal closes the neck cleanly.
Does a loose filler cap affect running?
A cap that does not seal lets the crankcase breathe wrong and can weep oil, so make sure it seats and clicks home.
Fitment verified by the Kei truck specialists at Oiwa Garage · Listing updated June 2026.