Constant oscillation of the main regulator valve and/or the boost regulator valve in their bores creates wear, which can result in oil pressure loss or cross leaks and valve malfunction.
Sonnax now offers an oversized valve kit for both the main regulator valve and boost regulator valve to restore proper clearance to the bore and prevent oil loss.
If regulated line leaks to exhaust at the main regulator, it creates a low pressure condition. Wear at the inner balance spools prevents the valves from stroking, which can cause high line pressure. Wear at the inboard bore also affects the K1 clutch circuit, which can result in 1-2 or 2-3 shift complaints. Wear at the inboard end of the boost regulator bore can reduce the ability of EPC/TV pressure to stroke this valve open. Full boost exiting this valve combines forces with the main regulator spring, increasing line pressure. Sonnax offers an oversized valve kit for both the main regulator valve, 119940-08K, and the boost regulator valve, 119940-07K. These kits allow the valve bores to be refurbished and restore proper pressure control.