Kohler TH16 / TH18 — Crankcase Vacuum Test
Testing & diagnosis · Crankcase breather
For the Kohler TH16 / TH18, from the Kohler service manual.
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Procedure
- Insert stopper/hose into oil fill hole, leave other manometer tube open, keep shut-off clamp closed.
- Start engine and run at no-load high idle speed (3200 to 3750 RPM).
- Open clamp and note water level; engine side should be minimum 30 cm (12 in.) above open side.
- Close shut-off clamp before stopping engine.
Tools required
- Water manometer (Kohler Part No. 25 761 02) Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Minimum 30 cm (12 in.) water column vacuum
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.