Mercury Quicksilver 19202001 Water Pump Plate Gasket — 6 / 8 / 9.9 HP Outboard

Mercury Quicksilver 19202001 — Water Pump Plate Gasket, 6 / 8 / 9.9 HP Outboard

Overview

Mercury Quicksilver 19202001 is a genuine OEM water pump plate gasket for selected Mercury and Mariner small outboard lower-unit water pump assemblies. It is positioned within the water pump stack — between the face plate, impeller, cover assembly, and water-tube components — where it seals the pump plate and maintains proper cooling-water flow through the lower unit. It is the current replacement for earlier gaskets 19202 and 42206.

Supersession note: If your service records or parts diagram shows 19202 or 42206, use 19202001 as the correct current OEM replacement.

Fitment note: This gasket is part of a water pump assembly that contains several similar seals and gaskets. Confirm that the parts diagram specifically calls for 19202001 / 27-19202001 — especially when servicing older engines originally cataloged with the earlier 19202 number.

Compatible Applications

• Mercury / Mariner 6 HP outboard — lower-unit water pump assembly (confirm serial range; applies from serial 0P325500 and up on later models, and earlier models originally using 19202)
• Mercury / Mariner 8 HP outboard — lower-unit water pump assembly (confirm serial range)
• Mercury / Mariner 9.9 HP outboard — lower-unit water pump assembly (confirm serial range)
• Always confirm by exact engine model and serial number using the Mercury water-pump assembly diagram

Service Interval

Replace this gasket at every water pump service — whenever the lower unit is opened for impeller, face-plate, or pump-base service. Gaskets are a one-time-use component and must not be reused after removal. Reusing a compressed or hardened gasket reduces sealing effectiveness and can allow internal leakage that reduces cooling-water flow to the engine.

When to Replace

• At every water pump service — whenever the pump plate or impeller is being replaced
• Gasket is compressed, torn, hardened, or no longer flat
• Evidence of cooling-water leakage within the lower unit water pump stack
• Engine is running warm or overheating and a water pump inspection is being performed
• Any time the lower unit is opened and the water pump assembly is disturbed

Installation Notes

• Clean the pump plate and all mating surfaces thoroughly before installation — old gasket material or corrosion on the seating surfaces will prevent proper sealing
• Install the gasket in the correct orientation as shown in the Mercury water-pump assembly diagram for the specific engine model and serial range
• While the lower unit is apart, inspect the impeller, face plate, pump cover, housing seals, and water-tube components for wear or damage — replacing all worn components in the same service visit avoids having to re-open the lower unit shortly after
• Use a complete water pump repair kit where available to replace all gaskets, seals, and the impeller in one service
• Follow torque specifications in the Mercury service manual for the pump housing fasteners after reassembly

Technical FAQ

• What is the difference between 19202001 and the earlier 19202? 19202001 is the current active Mercury OEM part number that supersedes the original 19202 (and also 42206). They are functionally the same gasket — 19202001 is the correct current replacement for either earlier number. If your diagram or service records show 19202 or 42206, order 19202001.
• Can I reuse the original gasket during impeller service? No. Water pump plate gaskets compress under the clamping load of the pump housing and will not re-seal reliably if reused. Reusing an old gasket is one of the most common causes of reduced cooling performance after a water pump service. The gasket should always be replaced whenever the pump is opened.
• Can I cut a generic gasket to fit instead of using the OEM part? Not recommended. The opening pattern, material thickness, and sealing face of 19202001 are matched to the pump plate geometry and the surrounding water passages. An improperly cut or incorrect-thickness generic gasket can change the pump clearances or leave part of the cooling circuit incompletely sealed, reducing cooling flow. At this price point, there is no practical reason to use a substitute.
• Should I replace all water pump components at the same time? Yes. Best practice for water pump service is to replace the impeller, plate gasket, base gasket, housing seals, and any wear-prone components as a complete set. This avoids having to re-open the lower unit because a gasket or seal that was left in place then failed shortly after the impeller was replaced.

Part Numbers & Supersession

• Current Mercury OEM: 19202001 / 27-19202001
• Supersedes: 19202 / 42206

Related Products

• Mercury Water Pump Base Gasket 192043
• Mercury Water Pump Gasket 858524 — MerCruiser Alpha One & Outboard
• Mercury Quicksilver Circulating Water Pump Gasket 879150138 — MerCruiser 3.0L
• Mercury MerCruiser Quicksilver 8M0187157 Gearcase Drain & Fill Screw Seal — Blue OEM Washer

Parts Desk Insights

Best Use Case: This gasket is the correct OEM part for water pump plate service on Mercury and Mariner 6, 8, and 9.9 HP outboards where the diagram calls for 19202001 / 27-19202001. It’s most commonly needed during a routine impeller replacement — replacing the plate gasket at the same time as the impeller is the right approach and eliminates a common source of post-service cooling issues. If you are performing a full water pump service, replace all gaskets, seals, and the impeller together rather than individually.

Common Issues: The most frequent mistake is reusing the original plate gasket during an impeller replacement — the compressed gasket will not re-seal properly and can cause reduced cooling flow even with a new impeller installed. The second common issue is not confirming the serial number before ordering — this gasket supersedes the earlier 19202, and some older diagrams may still show the earlier number. Use 19202001 for any application that previously called for 19202 or 42206.