Kohler — Crankcase Vacuum Test (Water Manometer)
Testing & diagnosis · crankcase breather
From a Kohler service manual covering: CV17, CV18, CV20, CV22, CV23, CV25, CV26, CV730, CV740, CV745. Check it applies to your exact model before use.
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Procedure
- Insert stopper/hose into oil fill hole, leave other manometer tube open to atmosphere, shut off clamp closed.
- Start engine and run at no-load high speed (3200 to 3750 RPM).
- Open clamp and note water level in tube; engine side should be minimum 10.2 cm (4 in.) above open side.
- Close shut off clamp before stopping engine.
Tools required
- Water manometer (SPX KO1048) Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Minimum 10.2 cm (4 in.) water level difference
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.