Parts for your 2005 Honda Odyssey-Sump plug washers

2005 Honda Odyssey sump plug washers — what they do and when to replace them

For the 2005 Honda Odyssey, a sump plug washer is absolutely relevant and fitted from factory. Honda’s own technical materials spell this out: the 2005 Odyssey Owner’s Manual (Changing Engine Oil and Filter) instructs to “install a new washer on the drain bolt” and specifies tightening the drain bolt to 29 lbf·ft (39 N·m). The Honda Service Manual for this generation repeats the direction to replace the drain plug washer at each oil change. The commonly specified part is a 14 mm aluminium crush washer (Honda P/N 94109-14000).

On this Odyssey’s J35 V6, the sump plug washer is a small, single-use sealing ring that sits under the engine oil drain bolt. When the bolt is torqued, the soft alloy washer “crushes” slightly to conform to the mating surfaces, creating a reliable seal. That crush action is why it’s not meant to be reused, once compressed, it won’t spring back, which can lead to weeping or annoying drips on the driveway.

As part of regular servicing, it’s good practice to have a fresh washer ready for every oil change. Here’s the easy, no-fuss approach owners and workshops in Australia and New Zealand tend to follow:

• Use the correct 14 mm aluminium crush washer (genuine or quality equivalent).
• Wipe the sump’s sealing face clean, and inspect the drain bolt for burrs or damage, replace the bolt if the flange is scored.
• Install the new washer, snug the bolt, then torque to 39 N·m (29 lbf·ft). No need for sealants or tape.
• Refill with the correct oil, run the engine, and check for any seepage once warm.

Reusing the old washer or over-tightening to “chase” a seal can risk stripped threads in the alloy sump — a costly fix compared with a cheap washer. If a slow leak persists even with a new washer and correct torque, the plug or pan face may be nicked and worth closer inspection.

Some aftermarket options offer copper washers, they can work, but Honda designs this model around aluminium crush washers for predictable sealing at the specified torque. Sticking with the right size and material keeps servicing straightforward and leak-free.

What size sump plug washer does a 2005 Honda Odyssey use?

It uses a 14 mm aluminium crush washer, commonly referenced as Honda part number 94109-14000. It’s a single-use item designed to deform slightly when torqued, ensuring a proper seal without needing sealants.

What’s the correct torque for the sump plug on this model?

Torque the engine oil drain bolt to 39 N·m (29 lbf·ft), as stated in Honda’s owner and service manuals. Using a torque wrench helps avoid over-tightening, which can damage the sump threads or the plug.

Can the old washer be reused if it looks fine?

Not recommended. Once crushed, the washer won’t seal as designed a second time. Reuse often leads to minor leaks. A fresh washer at each oil change is cheap insurance for a clean, dry sump.