Kohler — BASIC ENGINE TESTS

A Kohler service procedure — check it applies to your exact model before use.

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Procedure

1. Insert stopper in oil fill hole, leave other end of tube open to atmosphere. Make sure shut-off clamp is closed.
2. Start engine and run at high speed—3200 to 3600 rpm.
3. Release the clamp and note the water level in the tube. The level in the engine side should be 15- 20” above the level in the open side. If there is no vacuum or a positive pressure, check for the following conditions: NOTE: Clamp must be closed before stopping engine. a. Crankcase breather clogged or inoper¬ ative. Disassemble breather, clean parts thoroughly, reassemble, and recheck pressure. b. Seals and/or gaskets leaking. Check for proper sealing of crankcase. c. Blowby or leaky valves. Confirm by test¬ ing compression. d. Exhaust restriction. Check for defective muffler. Compression Test To check compression, remove spark plugs, insert compression gauge in each spark plug hole, set the throttle and choke to the wide open position, insure that air intake and exhaust sy stems are not re¬ stricted, and motor engine using the starting motor. Take several readings on both cylinders. A difference in pressure reading between cylinders in excess of 15%, or readings below 90 PSI can indicate the following:

Source: manual:16304_text.pdf. Figures and steps are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.