National 710834 Crankshaft Seal - Spring Loaded Multi-Lip Design

When you're doing engine work that involves the crankshaft, using a quality seal like this National 710834 is crucial for preventing oil leaks and maintaining proper engine performance. National has been making sealing solutions for over 70 years, and their reputation for reliability is well-deserved. The spring-loaded multi-lip design provides excellent sealing while accommodating minor shaft movements and wear. The temperature range of -40°F to 400°F (-40°C to 204°C) means this seal can handle everything from cold winter starts to the intense heat generated near engine components. The excellent high-temperature capabilities are particularly important for crankshaft applications where heat from combustion and friction can challenge lesser seals. I've used National seals in numerous engine rebuilds, and they've consistently provided leak-free performance with proper installation. The compatibility with a wide range of fluids ensures it won't degrade when exposed to various engine oils and additives. Installation requires care - make sure the sealing surface is clean and smooth, lubricate the seal lip properly, and drive it in straight to avoid damage. Whether you're rebuilding an engine, replacing a leaking front or rear main seal, or doing preventative maintenance during other engine work, using a quality National seal ensures you won't have to revisit the job due to leaks. It's one of those components where paying a little more for a trusted brand pays off in long-term reliability and peace of mind.