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Water Distribution Housing for MerCruiser Manual Drain Plugs 863802T2 863631T1
$87.99
Sale price
$87.99
Regular price
Available to Order
This Water Distribution Housing is a replacement coolant manifold for MerCruiser stern drive and inboard engines, compatible with models requiring manual drain plugs, and matches OEM Part# 863802T2 and 863631T1.
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I needed a forklift part and wasn’t sure which one fit. They asked for the model and serial number, got back to me quickly, and made sure I ordered the right one. Really helpful.
Randy W. — Verified customer
Product Overview
This water distribution housing directs coolant flow through MerCruiser engines to maintain proper operating temperature. Designed to replace worn or cracked OEM housings, it includes provisions for manual drain plugs for easy winterization. Ideal for boat owners or mechanics servicing MerCruiser 4.3L, 5.0L, 5.7L, and similar V6/V8 engines.
Key Features & Performance
- Direct replacement for OEM parts 863802T2 and 863631T1.
- Cast from corrosion-resistant aluminum alloy for long service life in salt and fresh water.
- Includes threaded ports for manual drain plugs (plugs sold separately) to simplify off-season storage.
- Precision-machined sealing surfaces to prevent leaks.
- Compatible with standard MerCruiser thermostat housings and coolant hoses.
Fitment & Compatibility
- MerCruiser 4.3L (Gen II)
- MerCruiser 5.0L (Gen II)
- MerCruiser 5.7L (Gen II)
- MerCruiser 6.2L (Gen II)
- MerCruiser 8.1L (Gen II)
- Replaces housings with manual drain plug ports
Common Uses
- Replacing a cracked or corroded water distribution housing on MerCruiser engines.
- Upgrading to a housing with manual drain plug capability for easier winterization.
- Restoring cooling system function in older or high-hour marine engines.
Technical Specifications
- Part Number(s): 863802T2, 863631T1
- Material: Cast aluminum
- Drain Type: Manual plug (not included)
- Engine Application: MerCruiser V6/V8 Gen II
Frequently Asked Questions
Q: Will this housing fit my MerCruiser 5.7L Alpha One? A: Yes, it is designed for Gen II V6 and V8 engines including the 5.7L; verify your engine���s serial number for exact compatibility.
Q: Does the housing come with drain plugs? A: No, manual drain plugs are sold separately; the housing has the threaded ports ready for standard plugs.
Product appearance and specifications may vary slightly by batch. Compatibility may vary by serial number. Verify fitment before purchase.