Description
5/8 UNF Tacho Bung Overview
The 5/8 UNF Tacho Hole Bung seals an unused tachometer port so your engine bay stays clean and dry. It closes off the threaded opening securely, which prevents fluid egress and keeps contaminants out. The Part Number (ID) is AM1064. Because the thread is a standard 5/8-18 UNF, you can match it quickly during service and carry a spare with confidence.
Features
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Zinc-coated steel for dependable corrosion protection
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5/8-18 UNF fine thread for firm, vibration-resistant seating
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Hex head for easy tightening with common spanners
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Quick, tidy way to blank a tacho or sensor port
Specifications and Materials
This bung uses zinc-coated steel to resist rust in marine environments. The thread is 5/8-18 UNF (Unified National Fine), which offers a finer pitch than UNC and therefore provides better resistance to loosening under vibration. If you need a concise reference for UNF thread series, see: https://amesweb.info/Screws/unf-thread-chart.aspx
Compatibility and Fitment
Use the 5/8 UNF Tacho Bung anywhere a 5/8-18 UNF female port requires a blanking plug, including tachometer pickups on engine blocks, water-pump housings, or adaptor plates. Before installation, confirm the thread designation on the port or measure with a gauge. Then clean the threads, apply a suitable thread sealant if specified by your workshop practice, and tighten the hex head to a firm seat. Additionally, reroute nearby hoses so the hex remains accessible for future checks. Because some custom builds vary, always compare the bung length with available depth to ensure it does not bottom against an internal shoulder.
Compliance and Safety
A properly sealed port reduces the chance of leaks that can contaminate bilges and harm the environment. Therefore, after fitting the 5/8 UNF Tacho Bung, run the engine and inspect the closed port at idle and again at cruise rpm. If you see weeping, retorque gently and recheck. Moreover, avoid over-tightening on soft aluminium threads to prevent galling.
Marine Applications
This plug suits ski-race and recreational inboards where unused tacho or sensor ports are common during upgrades. Consequently, it provides a simple way to secure the system while keeping service access straightforward. Pair it with routine inspection of hoses, clamps and adjacent fittings to maintain reliability between events.
Why Choose Argomarine
Argomarine supplies practical, hard-wearing parts that match Australian boating conditions. You get clear specifications, fast local support and parts that fit. Order the 5/8 UNF Tacho Bung AM1064 today to keep your engine bay sealed and serviceable.
Browse more gearbox parts here: https://www.argomarine.com.au/product-category/gear-box-parts/
