Description

If you’ve noticed your trusty MF 35 or 135 losing power at higher RPMs or developing a rough idle, tired valve springs might be the culprit. When these outer springs lose their tension, you’re risking more than just poor performance—you could be looking at catastrophic valve float that leads to bent valves or worse. This outer valve spring works with the inner spring to keep your Perkins engine’s valves following their cam profile precisely, just like they should.

What You’re Getting

Proper spring rate designed specifically for Perkins dual-spring valve systems
Heat-treated steel construction that maintains tension through countless cycles
Direct replacement that restores factory valve timing and performance
Works as part of the dual-spring setup with inner spring 63371 for optimal valve control
Essential component for preventing valve float at operating RPM

Built for Real Farm Work

This spring fits the legendary Perkins A3.152 three-cylinder and A4.203 four-cylinder engines that power classic Massey Ferguson tractors like the 35, 135, and related models. These are the workhorses you see mowing pastures, running hay equipment, operating loaders, and handling countless farm chores. Whether your tractor spends its days pulling implements or powering PTO-driven equipment, reliable valve operation keeps you running when there’s work to do.

Made to Last

Valve springs live in one of the harshest environments in your engine—constant heat cycles, repeated compression, and metal fatigue from thousands of operations per minute. This spring uses quality steel that’s properly heat-treated to maintain its tension through years of service. The dual-spring design your Perkins engine uses provides both performance and redundancy, so proper valve control continues even under demanding conditions.

Good to Know

Always replace valve springs as complete sets—never mix old and new springs or your valves won’t operate uniformly. This outer spring must work with inner spring 63371 for proper function. When you’re doing valve springs, it’s smart to inspect valve guides and seals while everything’s apart. If your engine has high hours, consider a complete valve job during spring replacement to get maximum life from your investment.