Valve Body

Important Steps in Disassembly and Reassembly of Valve Bodies





- When disassembling valve body, be sure to keep each valve together with its corresponding spring.
- When removing upper valve body from lower one, be careful not to let 4 steel balls shown in figure fall off.
- When assembling, install these four (4) steel balls in such in upper valve body as shown in figure.
- Replace each gasket with new one. Make sure that new gasket is the same as old one before installation.
- When installing each valve to valve body, use special care for proper installing direction.
- Several of throttle valve rings are used at throttle valve in upper valve body. Be sure to install the same number of throttle valve rings as those used before disassembly.
- When installing lower valve body cover and gasket to lower valve body, tighten lower valve body bolts to specification.
Tightening Torque for lower valve body cover bolts 5 Nm (0.5 kg-m, 4.0 ft. lbs.)
- Tighten throttle valve cam bolt to specification.
Tightening Torque for cam bolt 7.5 Nm (0.75 kg-m, 5.5 ft. lbs.)





- When installing upper valve body to lower one, install 16 upper valve body bolts and tighten them to specified torque.
1. - Lightly install 2 reamer bolts (positioning bolts) to D.
2. - Install all other 14 bolts.
3. - Tighten 4 bolts B to specification.
4. - Tighten 8 bolts C to specification.
5. - Tighten 2 bolts D and 2 reamer bolts A to specification.
Tightening Torque for upper valve body bolts 5.5 Nm (0.55 kg-m, 4.0 ft. lbs.)