Dashpot Control System
- Engine must be at normal operating temperature. Check idle speed and adjust if necessary. Remove cap, filter and separator from dashpot. See Fig 1.
- Start engine. Maintain engine speed at specified testing RPM. See DASHPOT TESTING RPM table. Plug Vacuum Transmitting Valve (VTV) hole with your finger. See Fig 1.
- Release throttle. Dashpot should be extended and dashpot setting RPM should be as specified. See DASHPOT TESTING RPM table. If idle speed is incorrect, adjust dashpot. See Fig 2.
- To check VTV operation, run engine at dashpot testing RPM for a few seconds. Plug the VTV hole with your finger. Release throttle. Uncover plugged hole. Engine should return to idle in about one second.
- Install dashpot separator, filter and cap. Install filter with coarser surface facing outward.
DASHPOT TESTING RPM
| Model | Testing RPM | (1) Dashpot Setting RPM | ||
|---|---|---|---|---|
| 4A-FE | 3500 | 2WD, 1500 | ||
| " | " | 4WD M/T, 1800 | ||
| " | " | 4WD A/T, 2200 | ||
| 4A-GE | 2500 | 1800 | ||
|
||||