Kohler Ford LSG-423 — Crankcase Ventilation Regulator Valve Test
Testing & diagnosis · Positive Closed-Type Crankcase Ventilation System
For the Kohler Ford LSG-423, from the Kohler service manual.
Browse Kohler generators & specs →
Before you start
- Do not disconnect the crankcase ventilation system and compensate with carburetor adjustments
Procedure
- With engine idling: remove PCV valve from its mounting but leave vacuum inlet side connected to hose; a hissing noise should be heard
- Check for a strong vacuum at the valve inlet and for vacuum leaks in the hose line and connections
- Reinstall PCV valve, then remove crankcase air inlet hose at air cleaner connection
- Loosely hold a small piece of stiff paper over the opening at the end of the inlet hose; after about a minute the paper should be sucked against the hose opening with noticeable force
- With engine stopped: remove PCV valve and shake it; a metallic clicking noise should be heard
Tools required
- Crankcase Ventilation Tester C8AZ-6B627-A (alternate air intake test) Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Source: Kohler service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.