Apply tension to the belt according to your engine's service manual (a general rule is about 1/2 inch of deflection under firm thumb pressure)
Install the new impeller
Sierra Marine 18-7907
78 4-Stroke 1996–1998 3856002 Lower Unit Duo Prop Application Volvo Penta DP-SM 1
it's critical to verify the part number (120324-55760) and dimensions against your existing filter
Air Filter – Fits Volvo Penta D12D, D13, D16 (Replaces 21196919, 3885441, 3828811) 275HP Apply tension to the beltProduct Details This Air Filter Fits Volvo Penta D12D, D13, D16 Marine Engines is engineered for Volvo Penta marine diesel engines, specifically the D12D, D13, and D16 series. It serves as a high quality aftermarket air filter element for use in these heavy duty marine applications, ensuring clean air intake for optimal engine performance. This part is a direct replacement for Volvo Penta OEM part numbers 21196919, 3885441, and 3828811, offering a