Kohler — Crankcase Vacuum Test
Testing & diagnosis · Crankcase Breather
From a Kohler service manual covering: 32690-12, EKT730, EKT740, EKT745, EKT750. Check it applies to your exact model before use.
Browse Kohler generators & specs →
Before you start
- Carbon Monoxide can cause severe nausea, fainting or death. Never run engine indoors.
- Rotating Parts can cause severe injury. Stay away while engine is in operation.
Procedure
- Insert rubber stopper into oil fill hole.
- Connect hose between stopper and one manometer tube.
- Leave other tube open to atmosphere.
- Check water level at 0 line; close pinch clamp.
- Start engine and run no-load high speed.
- Open clamp and note water level.
- Engine side level should be minimum 10.2 cm (4 in.) above open side.
- Close pinch clamp before stopping engine.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Crankcase vacuum: minimum 10.2 cm (4 in.) of water
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.