Water Pump Impeller Kit for Mercury/Mariner 65–220 HP and MerCruiser Sterndrives – Replaces 46-96148A8, 46-96148Q8 and 46-96148T8

Product Details

This complete water pump impeller kit is intended for servicing the lower-unit water pump on selected Mercury/Mariner outboards and MerCruiser sterndrives. The kit combines the short-vane impeller, pump housing assembly, wear plate, gaskets, grommet and face seal needed for a comprehensive water-pump service.

Listed applications include Mercury/Mariner 2-stroke 4-cylinder through V6 outboards from 65 to 220 HP equipped with short-vane impellers, plus selected MerCruiser Pre-Alpha, Alpha One, MC-1, R and MR drives. Always compare the original components and verify the complete model and serial-number range before ordering.

This kit is listed as an aftermarket replacement for Mercury part numbers 46-96148A8, 46-96148Q8 and 46-96148T8. Related aftermarket and Quicksilver references are included in the part-number matrix below for identification.

• Complete water-pump service kit with housing assembly.
• Short-vane impeller design for the applications listed below.
• Includes the primary pump components, gaskets and seals needed for installation.
• Verify model, serial number, original impeller design and component dimensions before purchase.

Part Number Matrix

Use these references to compare the listed replacement with the part number removed from your engine or sterndrive. A reference number alone does not replace model and serial-number verification.

Engine and Model Compatibility

Fitment depends on the exact model, year or production range, stroke configuration and serial number. The following applications are the listed compatibility ranges for this replacement. Confirm the number stamped on the original part and compare the pump components before installation.

Mercury/Mariner outboards: Selected 2-stroke, 4-cylinder through V6 models using a short-vane impeller.

MerCruiser sterndrives: Listed for selected Pre-Alpha, Alpha One, MC-1, R and MR drives. The stated Pre-Alpha and Alpha One range is serial 2491586 through 0D469858; verify the drive serial number and pump design before ordering.

Technical Specifications

Product type

Water pump impeller repair kit with housing assembly

Installation

Replacement service part; verify fitment before installation

Materials

Plastic housing and neoprene impeller

Impeller design

Short-vane

Approximate weight

0.37 kg (0.8 lb)

What's in the Box

• 1 × Water pump impeller, reference 47-89984T4
• 1 × Pump housing assembly, reference 46-96148A1
• 1 × Wear plate, reference 32435
• 1 × Water-tube gasket, reference 23-29804
• 1 × Grommet, reference 26-38970
• 1 × Face seal, reference 26-45577
• 7 × Assorted gaskets: 27-42631-1, 26-20260, 12-19183, 27-85610-1, 27-85608-1, 27-85609-1 and 27-32438

Component references are provided for identification. Confirm the actual parts and quantities against the package before beginning installation.

Installation Notes

1. Disconnect power: Disconnect the battery and place the outboard or drive in neutral, following the manufacturer's service instructions.
2. Prepare the gearcase: If required by the service procedure, place a drain pan under the lower unit and drain the gearcase lubricant.
3. Remove the lower unit: Remove the fasteners securing the lower unit to the midsection and carefully separate the lower unit.
4. Access the pump: Remove the water-pump housing and note the order and orientation of the existing components.
5. Clean the surfaces: Remove the old impeller, housing, wear plate, gaskets and seals. Clean the mating surfaces and inspect for scoring, corrosion or distortion.
6. Install the kit: Install the new components in the correct order. Lightly lubricate the impeller with a water-compatible lubricant and rotate the driveshaft clockwise while seating the impeller, unless the applicable service manual specifies otherwise.
7. Reassemble the pump: Ensure that every gasket and seal is correctly seated, then tighten the housing fasteners to the manufacturer's specifications.
8. Reinstall the lower unit: Align the driveshaft, shift shaft and water tube before securing the lower unit.
9. Refill and test: Refill the gearcase if it was drained. Run the engine only with an appropriate water supply and check for cooling-water flow, leaks and abnormal temperature.

Consult the factory service manual for the exact disassembly sequence, torque values, lubricant specifications and alignment procedure for your model.

Troubleshooting and FAQ

Safety and Important Information

• Verify the model, serial number, original part and component dimensions before purchase.
• Use the correct service manual and manufacturer torque specifications.
• Never run an outboard without an adequate water supply.
• Inspect the cooling system after installation and stop operation if overheating, leakage or abnormal water flow occurs.
• Professional installation is recommended when lower-unit removal or gearcase service is outside your experience.

About Sea Sierra

• Marine replacement parts — Parts are selected for common service and repair applications.
• Fitment-focused listings — Model, serial-number and component verification are encouraged before ordering.
• Practical service information — Product details and installation notes are provided to support proper maintenance.