Follow these instructions to keep the ATF cooler cleaner working properly:
Replace the two magnetic nonbypass spin-on filters after every 20 hours of use, based on the hour meter, or when you notice a restriction in the ATF flow.
Check the level and condition of the fluid in the tank before each use.
Replace the ATF in the tank when it looks dark or dirty.

Valve Inspection
Remove the valves.
Measure the valve in these areas.
Intake Valve Dimensions
A Standard (New):
27.85пјЌ28.15 mm (1.0965пјЌ1.108 ...
Specifications
Dimensions
Weights
Seating Capacities
Engine
Capacities
*1: Excluding the oil remaining in the engine
*2: Including the coolant in the reserve tank and that remaining in the engine
...
Honda Automobile Customer Service Contact Information
Honda Navi
American Honda Motor Co., Inc.
Honda Customer Service
Mail Stop 500-2N-7E
1919 Torrance Blvd.
Torrance, CA 90501-2746
Tel: (800) 999-1009
Fax: (310) 783-3273 ...