12V/110A Alternator – Fits Mercruiser QSD 2.0L, 2.8L & 4.2L Diesel (Replaces 898101505)

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12V/110A Alternator – Fits Mercruiser QSD 2.0L, 2.8L & 4.2L Diesel (Replaces 898101505) is backordered and will ship as soon as it is back in stock.

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You may return most new, unopened items within 7 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).

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Delivery and Shipping

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If you have any questions, feel free to email us at info@sierramarines.com, and we’ll get back to you within 20–36 hours.

Product Details

This high-output 12V/110A alternator is engineered for Mercruiser QSD 2.0L, 2.8L, and 4.2L diesel engines that use a multi-groove serpentine belt system. It serves as a robust aftermarket replacement, designed to meet or exceed original equipment performance and durability standards.

This unit is a direct replacement for Mercury/Mercruiser part number 898101505.

Designed for direct OEM replacement fitment.
Features a 6-groove serpentine pulley.
Provides a reliable 110-amp output for demanding marine electrical systems.

Part Number Matrix

Use this matrix to confirm equivalent references across OEM and aftermarket.

Brand	Part Number
Mercury/Mercruiser	898101505

Engine & Model Compatibility

Confirm your engine model/year in the table below.

This alternator fits a wide range of Mercruiser CMD QSD diesel engines. Please verify your specific model and part number before ordering.

Brand	Model	Rated HP	Stroke	OEM Part No.
Mercruiser	CMD QSD 2.0 EI 115	115	4-Stroke	898101505
Mercruiser	CMD QSD 2.0 EI 130	130	4-Stroke	898101505
Mercruiser	CMD QSD 2.0 EI 150	150	4-Stroke	898101505
Mercruiser	CMD QSD 2.0 EI 170	170	4-Stroke	898101505
Mercruiser	CMD QSD 2.0 ES 130	130	4-Stroke	898101505
Mercruiser	CMD QSD 2.0 ES 150	150	4-Stroke	898101505
Mercruiser	CMD QSD 2.0 ES 170	170	4-Stroke	898101505
Mercruiser	CMD QSD 2.8 EI 170	170	4-Stroke	898101505
Mercruiser	CMD QSD 2.8 EI 210	210	4-Stroke	898101505
Mercruiser	CMD QSD 2.8 EI 220	220	4-Stroke	898101505
Mercruiser	CMD QSD 2.8 EI 230	230	4-Stroke	898101505
Mercruiser	CMD QSD 2.8 ES 170	170	4-Stroke	898101505
Mercruiser	CMD QSD 2.8 ES 210	210	4-Stroke	898101505
Mercruiser	CMD QSD 2.8 ES 220	220	4-Stroke	898101505
Mercruiser	CMD QSD 2.8 ES 230	230	4-Stroke	898101505
Mercruiser	CMD QSD 4.2 EI 270	270	4-Stroke	898101505
Mercruiser	CMD QSD 4.2 EI 320	320	4-Stroke	898101505
Mercruiser	CMD QSD 4.2 EI 350	350	4-Stroke	898101505
Mercruiser	CMD QSD 4.2 ES 270	270	4-Stroke	898101505
Mercruiser	CMD QSD 4.2 ES 320	320	4-Stroke	898101505
Mercruiser	CMD QSD 4.2 ES 350	350	4-Stroke	898101505

Technical Specs

Product Type: Alternator
Voltage: 12V
Working Voltage: 12V
Output: 110 Amp
Fuel Type: Diesel
Pulley Type: Multi-groove serpentine (6 groove)
Weight: 3 kg (6.61 lb)
Height: 25.0 cm
Width: 25.5 cm
Length: 28.0 cm
OEM Part Number: 898101505

What’s in the Box

1 x Alternator (898101505)

Installation Notes

Disconnect the vessel's battery at the master switch or terminals to prevent electrical shorts.
Loosen the tensioner pulley and remove the serpentine belt from the old alternator.
Carefully disconnect the electrical wiring from the back of the old alternator, noting each connection's position.
Remove the mounting bolts securing the alternator and lift it out of the engine bay.
Position the new alternator and secure it with the original mounting bolts. Do not fully tighten yet.
Reconnect the electrical wiring to the correct terminals on the new unit.
Reinstall the serpentine belt, ensuring it is correctly routed on all pulleys.
Apply appropriate tension to the belt using the tensioner, then fully tighten all mounting bolts.
Reconnect the battery, start the engine, and verify the charging voltage is within the correct range (typically 13.8V-14.5V).

Troubleshooting & FAQ

How do I know if my alternator is failing?

Common signs include dimming lights, a warning light on the dash, a weak or dead battery, slow-starting engine, or a squealing/grinding noise from the engine bay. You can also test the output voltage with a multimeter; a healthy alternator should read between 13.8V and 14.5V while the engine is running.

Is this a direct fit for my engine?

This alternator is designed as a direct OEM replacement for the models listed in the compatibility table. Always compare the photos and part number (898101505) to your existing part to ensure a perfect match.

Can I swap the pulley from my old alternator?

This unit comes with a 6-groove serpentine pulley pre-installed. While it may be possible to swap pulleys, it is not recommended as it can cause alignment or performance issues and may void the warranty. Ensure the pulley matches your engine's belt system before purchase.

What is the recommended replacement interval for a marine alternator?

There is no fixed interval, as lifespan depends on usage, engine hours, and operating conditions (especially exposure to salt and moisture). It is best to inspect the alternator during regular service and replace it at the first sign of wear or decreased performance.

How is this aftermarket part different from the OEM version?

Our aftermarket parts are engineered to meet or exceed OEM specifications for fit, form, and function. They are made with comparable high-quality materials but are available at a more competitive price point by eliminating brand-name markups.

Do I need any special tools to install this part?

Standard mechanic's tools, including a socket set, wrenches, and a belt tensioner tool, are typically required. A multimeter is also essential for verifying the electrical output after installation.

OEM vs. Aftermarket?

This listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.

Shipping speed & cost

We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.

Warranty & returns

Covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused & in original condition). See our policy page or reach out for instructions.

Safety & Important Info

Verify images/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.
This is an aftermarket replacement, not an OEM component.
Professional installation is recommended for safety and performance.

About Sea Sierra

Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
Manufacturer-Direct Value — Fair pricing without compromising on materials or QC.

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