Parts for your 2002 Daihatsu Yrv-Oil cap

2002 Daihatsu YRV oil cap — purpose, fitment and easy maintenance

Yes, the 2002 Daihatsu YRV uses an oil filler cap. This is confirmed in Daihatsu’s YRV workshop manual (Engine Mechanical — Lubrication System), which shows the cap mounted on the cylinder head/rocker cover, and in the Daihatsu Electronic Parts Catalogue (EPC), which lists “Cap, Oil Filler” as a replaceable service item for K3-VE and K3-VET engines. So an oil cap is absolutely relevant to this model.

On the 1.3-litre K3-VE and K3-VET turbo engines fitted to the YRV, the oil cap seals the filler neck to keep engine oil in and contaminants out. It also helps maintain correct crankcase ventilation by preventing unmetered air from sneaking past the filler. When the cap or its rubber seal hardens, cracks or goes missing, owners often notice oil mist on the top of the engine, a whiff of burnt oil under the bonnet, or a slightly rough idle from a minor vacuum leak.

As part of routine servicing in Australia or New Zealand, the cap’s condition should be checked every service interval (typically around 10,000–15,000 km or six months, depending on the schedule used). The mechanic pops the bonnet, wipes the filler neck, and inspects the cap’s O-ring or gasket. If the seal is flattened, brittle or split, it’s time to replace the seal or the whole cap. A fresh film of clean engine oil on the O-ring before refitting helps the cap seat nicely and makes the next removal easier.

Replacement is straightforward: with the engine off, twist the old cap anti-clockwise, clean the area, then fit the new cap and turn it clockwise until it’s snug by hand. No tools or extra force required. Sticking with an OEM-quality cap ensures the thread, venting and seal profile match the YRV’s cam cover perfectly. On turbo YRV models (K3-VET), a healthy cap is extra important, as crankcase pressure spikes can push oil past a tired seal, leaving an oily mess.

• Signs it needs attention: oily film around the cap, visible cracks on the seal, cap won’t lock fully, or a faint whistle/rough idle.
• Service tip: inspect and wipe the cap at every oil change, replace at the first sign of seal damage or if the cap feels loose.
• Avoid “universal” caps that don’t seat properly—use a cap specified for K3-VE/K3-VET engines.

Popular questions

Q: Where is the oil cap on a 2002 Daihatsu YRV?

A: It sits on top of the engine’s cam/rocker cover, clearly marked and easy to twist off by hand. Open the bonnet and look for the round cap near the front or centre of the cover.

Q: How tight should the YRV’s oil cap be?

A: Hand-tight only. Turn it clockwise until it seats and stops, don’t use a tool. A light smear of fresh oil on the O-ring helps it seal and release cleanly next time.

Q: Can a bad oil cap cause leaks or drivability issues?

A: Yes. A damaged seal can let oil mist escape and may allow unmetered air into the crankcase, sometimes causing a slight rough idle. It’s cheap insurance to replace a tired cap or seal promptly.