# 816638 Mercury MerCruiser End Cover NLA | Genuine Quicksilver OEM Part

🔧 Product Description

  

Genuine Quicksilver Closed Cooling End Cover - Part Number: 816638

  

A genuine Quicksilver end cover used in selected MerCruiser closed cooling system assemblies. This cover is used on reservoir / heat exchanger service locations where the cooling system requires a removable end cover to seal the closed cooling circuit.

  

⚙️ Key Features

  

• Genuine Quicksilver OEM end cover

• Correct Mercury part number 816638

• Used in selected MerCruiser closed cooling assemblies

• Commonly associated with 7.4L MIE Gen VI closed cooling systems

• Service replacement cover for specified reservoir / heat exchanger end-cover locations

  

🔄 Supersession & Cross Reference

  

OEM Supersession Chain:

  

• 816638 current OEM service reference

  

OEM / Related Numbers:

  

• 816638

• 27-816636 related reservoir end-cover gasket

• 10-814877 related end-cover screw

• 816766 related oil cooler repair end cover

• 27-816768 related oil cooler gasket

  

Aftermarket / Verified Equivalents:

  

• No aftermarket equivalent

  

🚤 Compatibility

  

Commonly used on:

  

• MerCruiser closed cooling reservoir / end-cover applications

  

Typically suits:

  

• Engine models:

• MerCruiser 7.4L MIE LH Gen VI GM 454 V8 - 1996-1997, serial 0F820142 to 0K999999

• MerCruiser 7.4L MIE LH Gen VI GM 454 V8 closed cooling system with Hurth / Borg Warner 5000 transmission

• MerCruiser 7.4L MIE LH Gen V GM 454 V8 - serial 0D715494 to 0F820141, closed cooling system applications where 816638 is specified

• MerCruiser closed cooling system assembly 18390A12 reservoir repair-cover applications

• MerCruiser inboard petrol closed cooling reservoir assemblies using end cover 816638

  

• Engine Type: MerCruiser GM 454 V8 inboard petrol engine

• System Type: Closed cooling reservoir / end cover

  

🔌 Function

  

The end cover seals the end of the closed cooling reservoir or related cooling assembly, allowing the cooling circuit to retain coolant and pressure.

  

Common signs of failure:

  

• Coolant leakage from the end-cover area

• Corrosion around the cover edge

• Damaged or pitted cover sealing surface

• Coolant pressure loss

• Cover removal required during closed cooling system service

  

📦 Condition

  

• Genuine Quicksilver part

• Brand new

• Supplied in original or equivalent packaging

## Details

- **Price:** 70.0 AUD
- **Vendor:** Quicksilver
- **Tags:** Quicksilver Marine Parts | Oils Service Kits & Engine Components

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 70.00 AUD | In stock |

## Images

- 816638 Mercury MerCruiser End Cover NLA | Genuine Quicksilver OEM Part

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> Source: [Sawley's Auto and Marine](www.sawleysautoandmarine.com.au/products/816638-mercury-mercruiser-end-cover-nla-genuine-quicksilver-oem-part)
> Updated: 2026-05-17