Mercury 4-Stroke 175HP Outboard Engine Parts

(58 products)

This page is for Mercury 4-Stroke 175HP outboard engines. It is designed to help you find compatible parts and service information, including maintenance tips, common replacement parts, and troubleshooting guidance. You can also browse the main Mercury collection. To start browsing parts for this engine, scroll to the bottom of the page. On the collection page, use the “Filter & Sort” controls to narrow results by horsepower, year range, and part category/section.

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How to Identify Your 175HP Model

Find the serial/nameplate: commonly on the swivel bracket (port or starboard). Some engines also have an instruction plate near the steering tube; transom-mounted tags can appear on the inner transom plate or upper swivel pin.
Use the serial number to confirm exact parts. Model descriptors or suffixes may indicate shaft length (e.g., L/XL), steering/control type, and regional configuration.
Distinguish platforms: many 175HP 4-strokes are either an inline-four supercharged “Verado” or a naturally aspirated V6 “FourStroke.” Cowl badging and cylinder count help confirm which you have.
Note gearcase details when ordering gear-related parts (gear ratio and case style can vary by platform).

Platform Overview

175 Verado (Inline-Four Supercharged)

Feature	Description
Configuration	Inline-4 EFI 4-stroke with supercharger and belt drive; electronic management for precise fueling and ignition.
Common Models	Examples include “175 Verado” inline-four variants (model specifics verified by serial number).
Advantages	Strong mid‑range torque, smooth operation, sophisticated engine management.
Notes	Many parts are platform‑specific (supercharger belt, idlers, intake components). Match parts to serial to ensure compatibility.

175 FourStroke V6 (Naturally Aspirated)

Feature	Description
Configuration	V6 EFI 4-stroke, naturally aspirated; optimized for broad powerband and efficiency.
Common Models	Examples include “175 FourStroke V6” variants (verify exact configuration by serial number).
Advantages	Excellent fuel economy, quiet idle, strong overall durability with fewer forced‑induction components.
Notes	Service parts differ from Verado inline‑four; confirm spark plugs, filters, and anodes by serial.

Routine Maintenance & Service Parts

Intervals below are general guidelines for Mercury 4-stroke outboards; always follow your engine’s official service manual for exact procedures and specifications.

Item	Interval*	Remarks	Parts Link
Engine oil + filter	100 hours or annually	Use marine-rated oil and the correct filter; warm engine before draining.	Oil Filters
Gear oil (lower unit)	100 hours or annually	Inspect for water or metal fines; reseal if contamination is found.	Mercury Lower Unit Seal Kits
Spark plugs	100 hours (inspect at 50)	Check condition and gap; replace if fouled or worn.	Spark Plugs
Fuel filter (in-line/under-cowl)	100 hours or annually	Replace more often with poor fuel quality or storage issues.	Fuel Filters
Water pump impeller/kit	Every 2–3 seasons (or sooner)	Replace sooner if weak telltale, sandy/silty use, or overheat alarms.	Mercury Water Pump Repair Kits
Anodes (zincs)	Inspect 50 hours; replace as needed	Use alloy matched to water type (salt, brackish, fresh).	Anodes
Drive belt (Verado only)	Inspect 100 hours; replace per manual	Check for cracks or glazing; keep belt path clean.	Belts
Thermostat inspection	2–3 years, or if running hot/cold	Replace if sticking or corroded; verify operating temperature.	Mercury Outboard Parts

Frequently Used Parts Categories

Routine Service Supplies – Service & Maintenance Kits
Cooling System – Mercury Water Pump Repair Kits
Lower Unit / Gearcase – Mercury Lower Unit Seal Kits
Fuel System – Fuel Filters
Ignition / Electrical – Electrical Items
Starting & Charging – Starters and Alternators
Propulsion Hardware – Propellers & Anodes

Common Symptoms & Quick Checks

Symptom	Check First	Related Parts
Weak telltale or overheat alarm	Inspect intake screens, thermostat function, and water pump condition.	Water pump kit, thermostat, gaskets, intake screens
Poor acceleration or power loss	Check prop hub for slip, fuel filter for restriction, and spark plug condition.	Propeller, fuel filter, spark plugs
Hard starting or rough idle	Verify battery voltage, primer bulb integrity, and look for vacuum leaks; clean throttle body as required.	Spark plugs, fuel filter, hoses, sensors
Gearcase noise or metal in gear oil	Drain and inspect oil; check for water contamination; pressure/vacuum test seals.	Seal kit, bearings, gear lube

FAQs

Are parts interchangeable between Verado inline‑four and V6 FourStroke models?

Many are not. Filters, spark plugs, anodes, and numerous hardware items are platform‑specific. Always match parts to your engine’s serial number to ensure fit.

When should I replace the water pump impeller?

As a rule of thumb, every 2–3 seasons for recreational use, or sooner if you notice a weak telltale, overheat warnings, or you operate in sandy or silty water.

How often should the gear oil be changed?

Change the gear oil every 100 hours or annually. If water or metal fines are present, reseal and service the gearcase before returning to use.

What information helps confirm part compatibility?

Provide the engine serial number, horsepower and platform (Verado inline‑four or V6 FourStroke), shaft length, and any gearcase notes. Photos of the nameplate and the part you’re replacing are also helpful.

Ready to find parts? Browse the main Mercury collection and filter by horsepower, year, and model to locate the correct components for your 175HP 4-stroke.

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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.