Sierra Port Cylinder Head Hose 18-70937, Replaces OMC 340976, Fits Johnson/Evinrude 90-115 HP Outboards

The Sierra 18-70937 is a port-side cylinder head hose engineered as a direct replacement for Johnson and Evinrude (OMC/BRP) outboard engines. This hose connects to the port cylinder head as part of the engine's water or fuel circulation routing, and is built to meet or exceed original equipment quality so it seals and performs like the factory part it replaces. It is molded from rubber for flexibility and resistance to the heat, oil, and fuel exposure typical of an outboard powerhead, and is finished in white to match the original OEM hose appearance.

Because this is a port-side-specific hose, it is not interchangeable with the starboard-side hose used on the same engine family -- the starboard hose is a separate part number, so confirm you are ordering for the correct side before installation. The 18-70937 fits a range of Johnson/Evinrude outboard models from 88 HP through 115 HP, spanning several model years as detailed below, making it important to confirm your engine's specific model designation and year before purchase.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-70937
• Part Name: Cylinder Head Hose (Port)
• Material: Rubber
• Color: White
• Weight: 0.51 pounds
• UPC: 808282203368

Fitment

• Johnson/Evinrude (OMC/BRP) 90 HP (1994-95)
• Johnson/Evinrude (OMC/BRP) 100 HP (1996-97)
• Johnson/Evinrude (OMC/BRP) 115 HP (1994-97)
• Johnson/Evinrude (OMC/BRP) E88 (1996)
• Johnson/Evinrude (OMC/BRP) E90 (1996-98)
• Johnson/Evinrude (OMC/BRP) E100 (1996-97)
• Johnson/Evinrude (OMC/BRP) E112 (1996)
• Johnson/Evinrude (OMC/BRP) E115 (1996-98)
• Johnson/Evinrude (OMC/BRP) J88 (1996)
• Johnson/Evinrude (OMC/BRP) J90 (1996-98)
• Johnson/Evinrude (OMC/BRP) J100 (1997-98)
• Johnson/Evinrude (OMC/BRP) J112 (1996)
• Johnson/Evinrude (OMC/BRP) J115 (1996-98)

Replaces (OEM)

• 340976

Frequently Asked Questions

What does the Sierra 18-70937 fit? The Sierra 18-70937 fits Johnson and Evinrude (OMC/BRP) outboard engines including the 90 HP (1994-95), 100 HP (1996-97), 115 HP (1994-97), and the E88, E90, E100, E112, E115, J88, J90, J100, J112, and J115 models across 1996-1998, depending on model.

Is this hose for the port or starboard side? Part number 18-70937 is the port cylinder head hose specifically. The starboard-side hose for the same engine family is a different part number, so double-check your engine's port side before ordering.

What OEM part number does the 18-70937 replace? It replaces OMC part number 340976. If your parts diagram or engine manual lists 340976 for the port cylinder head hose, the Sierra 18-70937 is the correct match.

What material is the hose made from? The 18-70937 port cylinder head hose is made from rubber, chosen for flexibility and resistance to the heat and fluid exposure found around an outboard cylinder head.

What color is the Sierra 18-70937 hose? This hose is white, matching the original equipment color used on the covered Johnson/Evinrude outboard models.

How much does this part weigh? The Sierra 18-70937 port cylinder head hose weighs 0.51 pounds.

Is the Sierra 18-70937 a genuine OEM part or aftermarket? The 18-70937 is a Sierra-branded aftermarket replacement part, manufactured to meet or exceed the quality of the original equipment OMC 340976 hose it replaces.

Can I use this hose on any Johnson or Evinrude outboard? No, the 18-70937 is fit-specific to the 88-115 HP Johnson/Evinrude models and years listed for this part; it should not be assumed to fit outboards outside that range.

Does the 18-70937 come with clamps or fittings? The 18-70937 is supplied as the cylinder head hose itself; check your engine's existing clamps and fittings for reuse during installation.

How do I know if my engine needs the port hose or the starboard hose? Identify which cylinder head the failed or aging hose connects to on your engine; the 18-70937 is specifically the port-side hose, while the starboard side uses a separate Sierra part number.

What is the UPC for the Sierra 18-70937? The UPC for the Sierra 18-70937 port cylinder head hose is 808282203368.