863631T1 Distribution Housing for Mercury Mercruiser 4.3 5.0 5.7 6.2L Inboard

This Water Distribution Housing is a replacement water distribution housing compatible with Mercury and Mercruiser 4.3L, 5.0L, 5.7L, and 6.2L inboard engines and matches OEM Part# 863631T1.

Product Overview

This Water Distribution Housing routes coolant from the engine block to manifolds and exhaust elbows on Mercury and Mercruiser 4.3L, 5.0L, 5.7L, and 6.2L inboard marine engines. The housing maintains proper cooling flow and pressure, preventing hot spots and overheating. Built as a direct OEM-spec replacement, this water distribution housing restores cooling system integrity for boat owners and marine mechanics.

Key Features & Performance

• Precision-cast to match OEM dimensions and port alignment for bolt-on installation
• Corrosion-resistant material formulation suited for fresh and saltwater environments
• Maintains consistent coolant flow to both cylinder banks and exhaust risers
• Reinforced mounting flanges resist warping and sealing face distortion
• Accepts standard marine gaskets and hose connections without modification

Fitment & Compatibility

• Mercury/Mercruiser 4.3L V6 inboard engines
• Mercury/Mercruiser 5.0L V8 inboard engines
• Mercury/Mercruiser 5.7L V8 inboard engines
• Mercury/Mercruiser 6.2L V8 inboard engines

Common Uses

• Replacing a cracked, leaking, or corroded water distribution housing
• Restoring proper coolant distribution during an engine rebuild or repower
• Servicing raw-water or closed cooling systems on stern drive and inboard setups
• Addressing uneven engine temperatures caused by a restricted housing
• Preventative maintenance when upgrading hoses and thermostats

Technical Specifications

• Part Number(s): 863631T1
• Compatible Engine Sizes: 4.3L, 5.0L, 5.7L, 6.2L
• Application: Inboard marine engines

Frequently Asked Questions

Q: Does this housing work with both raw water and closed cooling systems? A: Yes, it is designed for standard inboard cooling circuits and functions in both raw water and closed cooling configurations.

Q: Are gaskets included with this water distribution housing? A: No, gaskets are sold separately; use OEM or equivalent marine-grade gaskets for a leak-free seal.

Product appearance and specifications may vary slightly by batch. Compatibility may vary by serial number. Verify fitment before purchase.