Kohler — Checking and Adjusting ACR (engines prior to Serial No. 9006118)
Adjustments · Automatic Compression Release
From a Kohler service manual covering: K141, K161, K181, K241, K301, K321, K341, K532, K582, K91, KT17, Kt19. Check it applies to your exact model before use.
Applies to: Kohler Kt19
Before you start
- Tab is hardened - do not bend back and forth more than 3 or 4 times
- Do not attempt to bend hardened steel ACR tabs on engines serial no. 9006118 and after
Procedure
- Check valve tappet clearances and adjust as necessary to specification.
- Remove cylinder head and turn the engine over by hand until BDC of the intake stroke.
- Mount a dial indicator on the top of the exhaust valve and set at 0.
- Slowly turn the flywheel clockwise; exhaust valve should open when piston is about 2/3 of the way up the cylinder.
- If valve lift was above .042, tap valve down to within range; if below .031, remove camshaft cover and bend ACR tab upward.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Exhaust valve opening .031 - .042
Full service-parts list: Kohler Kt19 →
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.