Cylinder Head Valve Spring Dynamometer 330 lbf (150 kgf) — TM-2

Valve spring pressure testing equipment is used to test if cylinder head springs are within correct force specifications. During engine operation, springs lose tension and need verification before assembly. The TM-2 Chinelatto allows precise measurement up to 331 lb (150 kgf), ensuring valves open and close at proper pressure. It's essential for machine shops working with cylinder heads, preventing compression problems and valve burning in assembled engines.

The TM-2 Chinelatto tester has maximum capacity of 331 lb (150 kgf), accepts springs with diameter up to 2.7 inches (68 mm) and maximum stroke of 4.7 inches (120 mm). Dimensions are 15.7 x 12.6 x 25.2 inches (400 x 320 x 640 mm) and weighs 90 lb (41 kg). Operates on 220 volts and is robustly built for intensive machine shop use. These specifications handle most car, truck and industrial engine cylinder heads. The 4.7-inch (120 mm) stroke allows testing from short to tallest market springs.

The equipment accepts valve springs from cars, motorcycles, trucks and industrial engines, provided they have up to 2.7 inches (68 mm) diameter and don't exceed 331 lb (150 kgf) force. Works for intake and exhaust springs, both single and dual. Engines from 1.0L to large V8s fit the specifications. The 4.7-inch (120 mm) stroke allows testing varied height springs. Compatible with virtually all cylinder heads arriving at machine shops, except very large specialty application engines.

Manual tester like the TM-2 is simpler, more reliable and cheaper to maintain. You control pressure manually and have better measurement sensitivity. Hydraulic applies force automatically, being faster for high volumes, but needs more maintenance and higher cost. For most machine shops, manual works perfectly, since spring testing isn't an operation requiring high speed. What matters is measurement precision, not quickness.

You place the spring on equipment base, position the moving head on top and gradually apply pressure through the manual system. A gauge or indicator shows applied force in pounds as you compress the spring. Normally measured at specific heights (spring installed and valve open). Compare with engine manufacturer specification. If force is below standard, spring needs replacement. The TM-2 ensures precise measurement up to 331 lb (150 kgf).

Maintenance is quite simple: regular cleaning, lubrication of moving points and force gauge calibration verification. Keep contact surfaces clean and scratch-free. Check if bolts are tight and there's no play in the mechanism. Being robust mechanical equipment, the TM-2 has few wear points. Annual calibration recommended or when suspecting incorrect measurements. Avoid drops and impacts that can affect precision accuracy.