Cummins 4-Stroke 115-170HP Marine Engine Parts

(2 products)

Built for Cummins 4-Stroke 115–170HP outboard engines, this page helps you find compatible parts and service information. Below you’ll find maintenance tips, common replacement part categories, and troubleshooting guidance. You can also browse our main Cummins parts collections, and at the bottom of this page you can start browsing parts for this engine. On the collection pages, use the Filter & Sort controls to narrow results by horsepower, year range, and part category/section.

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How to Identify Your 115–170HP Model

Find the nameplate/serial plate on the transom bracket or engine swivel bracket; some models also have a sticker on the cylinder block or mid‑section.
Record the full model code and serial number. Suffix letters often indicate shaft length, starting method, control type (tiller/remote), and revision level.
Confirm it’s a 4‑stroke platform. 4‑stroke outboards have an engine oil dipstick and oil filter; service intervals include oil and filter changes.
Note gearcase details (standard vs high‑thrust), which can affect propeller fit, seal kits, and water pump components.

Platform Overview

Inline‑4 EFI 4‑Stroke (approx. 115–150 HP class)

Feature	Description
Configuration	Inline‑4, EFI 4‑stroke, DOHC/SOHC depending on model year; designed for general‑purpose cruising and fishing.
Common Models	Typical 115–150 HP 4‑stroke outboard variants with remote or tiller controls and multiple shaft lengths.
Advantages	Balanced weight, good fuel economy, broad mid‑range torque, straightforward maintenance.
Notes	Propeller spline/count and gear ratio vary by gearcase; verify serial/model code when selecting water pump kits and seal kits.

V6 EFI 4‑Stroke (approx. 150–170 HP class)

Feature	Description
Configuration	V6, EFI 4‑stroke; tuned for higher output with smooth operation and strong holeshot.
Common Models	Typical 150–170 HP 4‑stroke outboard variants including offshore and high‑thrust options.
Advantages	Higher peak power, smoothness at cruise, and robust charging output for electronics.
Notes	Water pump, anode sets, and prop hubs can differ from inline‑4 models—always match by serial/model code.

Routine Maintenance & Service Parts

Intervals below are general guidelines for 4‑stroke outboards. Always follow the official service manual for your specific model and operating conditions.

Item	Interval*	Remarks	Parts Link
Engine oil + filter	100 hours or annually	Use marine‑grade FC‑W oil; replace filter every oil change.	Oil Filters
Gear oil (lower unit)	100 hours or annually	Inspect for water intrusion and metal; replace seals if contamination is found.	Lower Unit Seal Kits
Spark plugs	300 hours or 3 years (inspect sooner)	Gap to spec; replace if fouled or worn.	Spark Plugs
Fuel filter / water separator	100 hours or annually	Drain water separator periodically; replace filters to prevent injector wear.	Fuel Filters
Water pump impeller / kit	2 seasons or 200 hours (inspect annually)	Critical for cooling; replace sooner if sand/silt use or weak telltale.	Impeller Rebuild Kits
Anodes (internal & external)	Inspect every 50 hours; replace when 50% depleted	Choose zinc, aluminum, or magnesium based on water type.	Anodes

Frequently Used Parts Categories

Routine Service — Service & Maintenance Kits
Cooling System — Water Pumps
Fuel System — Fuel Filters
Ignition / Electrical — Rectifiers
Propulsion / Lower Unit — Lower Unit Seal Kits
Corrosion Protection — Anodes

Common Symptoms & Quick Checks

Symptom	Check First	Related Parts
Weak telltale or overheat alarm	Inspect intake screens, confirm strong telltale, test thermostat, and review recent impeller service.	Water pump kit, impeller, thermostat, gaskets, intake screen
Hard starting or rough idle	Check battery voltage, spark quality, fuel freshness, and replace clogged filters.	Spark plugs, fuel filter, rectifier/regulator, hoses
Poor acceleration or power loss	Verify prop condition/pitch, inspect for fuel restriction, and perform compression/leak‑down if needed.	Propeller, fuel pump, fuel filters, spark plugs
Gearcase noise or metal in gear oil	Check oil level/condition and for water intrusion; pressure/vacuum test if contamination is present.	Lower unit seal kit, bearings, shims, gear lube

FAQs

Are parts interchangeable between different years or platforms?

Some routine items may overlap, but many components vary by serial/model code, gearcase, and platform (inline‑4 vs V6). Always verify with your exact model identification before ordering.

When should the impeller be replaced?

Inspect annually and replace every 2 seasons or ~200 hours. In sandy, silty, or shallow environments, replace more frequently to prevent overheating and pump housing damage.

How often should gear oil be changed?

At least every 100 hours or annually. If the oil appears milky, smells burnt, or contains metal, address seal or gear wear issues before further use.

What information helps confirm part compatibility?

Provide the full model code, serial number, shaft length, control type (tiller/remote), and any gearcase details (standard vs high‑thrust). Photos of the nameplate and the part being replaced are also helpful.

Ready to find the right components? Browse our main Cummins parts collections and narrow by horsepower, year, and model using Filter & Sort.

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If you’re unsure about your model, send us a photo of the nameplate and the part you need and we’ll help verify compatibility.