Sierra 18-1909-1 Manifold Elbow, Replaces OMC 913784, Use with 18-1986-1 Exhaust Manifold
Sierra 18-1909-1 Manifold Elbow, Replaces OMC 913784, Use with 18-1986-1 Exhaust Manifold
The Sierra 18-1909-1 Manifold Elbow is a direct-replacement exhaust manifold elbow built to connect to the 18-1986-1 exhaust manifold as part of a marine engine's exhaust system. The manifold elbow routes exhaust gases and cooling water away from the manifold, and this part is designed to work with the corresponding 18-8507 mounting kit for a complete, correctly sealed installation.
As an OEM cross-reference replacement, the 18-1909-1 is built to match the fit and function of the original OMC 913784 elbow, giving boat owners and marine technicians a straightforward way to source a replacement without hunting down a discontinued original part. Because exhaust manifold elbows are exposed to constant heat cycling and saltwater or freshwater cooling flow, replacing a corroded or cracked elbow with a properly matched part like the 18-1909-1 helps maintain a tight, leak-free exhaust and cooling path.
This part is sold as the manifold elbow itself; the separate 18-8507 mounting kit (which includes the gasket used with this elbow) should be ordered alongside it to complete the installation. Always confirm that your engine's exhaust manifold is the 18-1986-1 before ordering, since manifold elbows are matched to a specific manifold design.
Specifications
- Brand: Sierra
- Manufacturer Part Number: 18-1909-1
- Product Type: Manifold Elbow
- Weight: 26.5 pounds
- Used With Manifold: 18-1986-1
- Compatible Mounting Kit: 18-8507
- OEM Cross Reference: 913784, 3855270, 3850459
- UPC: 808282202859
Fitment
- Use with Manifold 18-1986-1
- Pair with Mounting Kit 18-8507 for complete installation
Replaces (OEM)
- 913784
- 3855270
- 3850459
Frequently Asked Questions
What manifold does the Sierra 18-1909-1 fit? The Sierra 18-1909-1 manifold elbow is designed for use with the 18-1986-1 exhaust manifold, so confirm your engine uses that manifold before ordering.
Is the 18-1909-1 a direct replacement for OMC 913784? Yes, the 18-1909-1 manifold elbow is built to replace OMC 913784, along with the additional cross-reference numbers 3855270 and 3850459.
How much does the 18-1909-1 manifold elbow weigh? The Sierra 18-1909-1 manifold elbow weighs 26.5 pounds.
Do I need to buy anything else to install the 18-1909-1? Yes, the 18-1909-1 should be paired with the 18-8507 mounting kit, which supplies the gasket and hardware needed for a complete installation.
Does the 18-1909-1 include a gasket? No, the gasket used with the 18-1909-1 elbow is included in the separate 18-8507 mounting kit rather than with the elbow itself.
What OEM part numbers cross-reference to the Sierra 18-1909-1? The 18-1909-1 cross-references to OEM numbers 913784, 3855270, and 3850459.
Why would I need to replace a manifold elbow like the 18-1909-1? Manifold elbows are exposed to constant heat and cooling water flow, so a cracked, corroded, or leaking elbow is typically replaced with a matched part such as the 18-1909-1 to restore a sealed exhaust and cooling path.
Is Sierra 18-1909-1 an OEM part or an aftermarket replacement? The 18-1909-1 is a Sierra-branded aftermarket manifold elbow engineered as a replacement for the OEM 913784 elbow and its cross-referenced numbers.
Can I use the 18-1909-1 with a different exhaust manifold? The 18-1909-1 is specified for use with the 18-1986-1 exhaust manifold; fit with other manifold models is not confirmed.
What is included with the Sierra 18-1909-1? The 18-1909-1 listing covers the manifold elbow itself; the mounting kit (18-8507) with its gasket is a separate item needed to complete the installation.