Kohler TH16 / TH18 — Cylinder Leakdown Test
Testing & diagnosis · Combustion chamber
For the Kohler TH16 / TH18, from the Kohler service manual.
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Procedure
- Run engine 3-5 minutes to warm up.
- Remove spark plug(s) and air filter.
- Rotate crankshaft until piston is at TDC of compression stroke and hold in position.
- Install adapter into spark plug hole.
- Connect air source of at least 50 psi to tester.
- Turn regulator knob clockwise until gauge needle is in yellow 'set' area.
- Connect tester quick-disconnect to adapter while holding engine at TDC; listen for escaping air.
- Check test results against leakdown table.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Air source at least 50 psi
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.