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7.3
Section 7
Cooling System
7
Figure 7-4. Coolant Levels on Reservoir.
NOTE: Do not operate the engine without coolant in
the system. Do not remove the radiator cap
when hot. Engine coolant is hot and under
pressure and can cause severe burns. To
prevent engine overheating and damage, do
not exceed more than 70% anti-freeze in the
cooling system.
Draining Cooling System
1. Stop the engine and let the engine cool
sufficiently.
2. Unhook the retainer straps, and remove the upper
blower housing and screen assembly.
3. When it is cool enough to touch with bare hands,
slowly remove the radiator cap.
4. Locate and remove the coolant drain plug in the
lower side of both cylinder heads. See Figure 7-5.
Drain the coolant into a suitable container. After
the coolant has drained, apply pipe sealant with
Teflon
®
(not Teflon tape) to the threads and
reinstall the plugs. Torque the plugs to 13.5 N·m
(120 in. lb.). Some early production engines
contained steel plugs. Always use brass (soft)
plugs (Kohler Part. No. 66 139 01-S) when
service is performed.
5. Loosen the two screws holding the overflow
reservoir retainer bracket to the radiators. See
Figure 7-6.
Figure 7-5. Location of Coolant Drain Plugs.
NOTE: To avoid thread damage, do not attempt
to remove plugs when engine is hot.
Figure 7-7. Tipping Bracket Away after Removing
Reservoir Cap.
Figure 7-6. Loosening Retainer Bracket Mounting
Screws.
6. Remove the reservoir cap. Carefully lift the top
bracket up slightly, and pull the reservoir out
between the bracket and fan. See Figures 7-7
and 7-8. Pour out the contents of the reservoir
and wash or clean as required. Dispose of all the
old coolant properly, according to local
regulations.
Coolant Drain
Plugs