Push Rod Tube, Big Mouth Spring Loaded, Each

Scat Big Mouth Spring Loaded Push Rod Tube (Part #20177)

High-Performance Leak Protection and Clearance

The Scat Big Mouth Spring Loaded Push Rod Tube is engineered to eliminate the common headaches associated with aircooled VW top-end maintenance. Manufactured from 6061-T6 aluminum, these tubes are designed with a "Big Mouth" diameter to provide the necessary clearance for high-lift camshafts and high-ratio rocker arms, preventing the pushrods from rubbing against the tube walls. The dual-sleeve design is sealed with high-quality Viton O-rings, offering superior resistance to heat and chemical degradation compared to standard rubber seals.

VW Fitment and Compatibility

This push rod tube is a universal fit for Volkswagen Type 1, 2, and 3 aircooled engines, including the 1200cc, 1300cc, 1500cc, and 1600cc powerplants. It is a favorite for Beetle, Ghia, Bus, and Dune Buggy owners because the spring-loaded mechanism allows for installation without removing the cylinder heads. This makes it an essential component for both performance engine builds and quick, reliable leak repairs on existing engines.

Pro Tech Tips from Appletree Auto

Tip 1: Lubricate Your Seals. Before assembly, apply a thin film of clean engine oil or a dedicated O-ring lubricant to the internal Viton seals and the outer ends. This ensures the sleeves slide together smoothly without pinching or tearing the O-rings, which is the most common cause of "new" leaks during installation.

Tip 2: Verify Seating Surfaces. Before installing the new spring-loaded tube, use a lint-free rag to thoroughly clean the bores in the engine case and the cylinder head. Any leftover grit or old gasket material can prevent the tube from seating squarely, compromising the tension-based seal provided by the internal spring.

Tip 3: Optimize for High-Lift Cams. When installing these in a performance engine, always rotate the engine by hand after installation to verify that the pushrods are centered within the "Big Mouth" opening. Even with clearanced tubes, extreme lift setups may require slight clocking of the tube to ensure the pushrod has a completely unobstructed path throughout the entire valve cycle.