Three-Way Catalyst; Vaporizer And Lock Off Valve (Wg1605-L-E3, Wg1605-Gl-E3; Length Of The Vapor Hose (Wg1605-L-E3, Wg1605-Gl-E3; Important Notice - Kubota WG1605-G-E3 Workshop Manual

WG1605-G-E3,WG1605-L-E3,WG1605-GL-E3, WSM

[1] THREE-WAY CATALYST

A three-way catalyst is a catalyst that oxidizes HC to CO
same time reduces NOx to N
The main basic component of an exhaust gas purification system that uses a three-way catalyst is feedback
control of air-fuel ratio by means of an O
characteristic with reference to the intake air-fuel ratio of the three-way catalyst.
[2] VAPORIZER AND LOCK OFF VALVE
(WG1605-L-E3, WG1605-GL-E3)
Vaporizer requires a normally-closed electrically controlled fuel lock off valve that is close coupled to the vaporizer
and off when ignition switch is off or when the engine is not running normally (supplied from Kubota). In operation
without a lock off upstream the vaporizer will flow fuel with the engine off. The vaporizer is not a fuel shut-off safety
device.
[3] LENGTH OF THE VAPOR HOSE
(WG1605-L-E3, WG1605-GL-E3)
Vapor hose length must not exceed 700 mm (27.6 in), shorter is generally considered better. Care should be
taken with hose routing and length to minimize the affect on vaporizer vibration isolation. The metal reinforced hose
should not be used.

[4] IMPORTANT NOTICE

These instructions are provided to the Final Engine Assemblers (FEA) who must ensure the engine, exhaust
system (catalyst), fuel system etc, are installed correctly in the engine's certified configuration.
Please confirm whether emission-related items are certain on application review.
(for EPA only)
Failing to follow these instructions when installing a certified engine in a piece of nonroad equipment violates
federal law (40 CFR 1068.105(b)), subject to fines or other penalties as described in the Clean Air Act.
The contractual agreement contract is necessary before mass-production.

[5] EMISSION-RELATED INSTALLATION INSTRUCTIONS

(1) Exhaust System

Kubota supplies a certified catalyst. FEA must use a Kubota certified catalyst and assemble the exhaust system
parts according to the instructions.
No other catalyst is certified for use with WG1605 Engine. No Other Catalyst can be used.
FEA may only install the exhaust system parts confirmed at application review.

(2) Intake System

To prevent decreases of engine output performance, intake resistance must be kept below a certain point.

(3) Crankcase Ventilation Connections

Crankcase emissions may not be discharged directly into the ambient atmosphere throughout its useful life.
(40 CFR 1048.115 (a))

(4) Gasoline Fuel System

If your equipment uses a volatile liquid fuel (such as gasoline), they must meet the evaporative emission
standards of 40 CFR 1048.

(5) Gaseous Fuel System

FEA must use only the vaporizer and the lock off valve Kubota offers and assemble the LPG fuel system parts
according to the instructions.
near the stoichiometric ratio.
2
sensor for the purpose of maximizing the emission purification efficiency
2
and H O and also CO to CO
2 2
I-7
INFORMATION
respectively and at the
2
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KiSC issued 01, 2012 A