Honda B/C/D/H/K Series Oil Cooler/Gallery O-Ring 91316-PE7-730

Genuine Honda Oil Cooler / Oil Gallery O-Ring (91316-PE7-730)

This is one of Honda's universal O-rings, the kind that seals an oil passage across dozens of engines going back to the mid-80s. It's used at the oil cooler and oil gallery on B, C, D, and K series engines, and it's the sort of part you need when you're doing a repair that opens up an oil passage and don't want to reuse a hardened, decades-old seal. Cheap, genuine, and exactly the right piece.

Where It Seals

This O-ring seals oil passages, at the oil cooler mount on engines that have one, and at oil gallery ports elsewhere.

Anywhere an oil passage is sealed with a soft O-ring, that O-ring hardens over time under heat and pressure until it stops sealing. What you get then is an oil leak at that joint, and on a passage under oil pressure, that can be more than a weep.

Because it's used in several places across the Honda lineup, the exact location depends on your engine. If a repair procedure calls out this part number, this is the seal it means.

Replace It Whenever You Disturb The Joint

The practical rule for a part like this.

Any time you separate a joint this O-ring seals, whether you're replacing an oil cooler, doing a rebuild, or working on anything that opens the passage, the old O-ring goes in the bin and a fresh one goes back in. It costs almost nothing, and reusing a compressed, hardened O-ring is how a repair develops a leak the moment you put it back together.

On an engine that's decades old, the original is well past its service life regardless of whether it looks intact.

Confirm By Part Number

With a fitment list this broad, the surest way to know you need it is the part number itself.

If your service manual, a rebuild kit, or a repair procedure references 91316-PE7-730, this is that O-ring. The wide application list means it's easy to confirm you're in the right place, since it covers so much of the Honda and Acura lineup.

Fitment

1985-1991 Honda CRX HF
1986-1987 Honda Civic Si
1986-1989 Acura Integra
1986-1990 Acura Legend
1988-2001 Honda Prelude
1989-1991 Honda Civic 4WD
1991-1993 Honda Accord
1991-2005 Acura NSX
1992-1994 Acura Vigor
1992-1995 Acura Integra GS-R
1992-1995 Honda Civic VX
1995-1998 Honda Odyssey
1997-2001 Acura Integra Type R
2000-2006 Honda Insight
2000-2009 Honda S2000
2002-2006 Acura RSX Type-S
2006-2015 Honda Civic Si
2007-2014 Honda CR-V
2008-2012 Honda Accord (4-cyl)
2009-2014 Acura TSX (4-cyl)
2012-2015 Honda Crosstour
2013-2015 Acura ILX 2.4
2014-2020 Acura RLX

Covers B, C, D, and K series engines. Part number 91316-PE7-730. Sold individually.

Who Should Grab One

This is for anyone doing oil cooler, oil gallery, or engine work that disturbs the passage this O-ring seals, and for anyone building a parts list off a service procedure that calls it out. It's a genuine Honda seal for a fraction of what a leak costs to chase, and it's the correct part rather than a generic O-ring that may not hold up to hot oil. Confirm the part number, replace it whenever you're in there, and seal it right.

Fits: Honda and Acura B, C, D, and K series, see the application list above. Part number: 91316-PE7-730. Function: seals oil cooler and oil gallery passages. Type: genuine Honda O-ring. Sold: individually.