General; Internal Egr (V3600-T-E3B, V3600-T-E3Cb, V3600-T-E3Bg; Exhaust Gas Recirculation - Kubota V3600-E3 Shop Manual

V3-E3B SERIES, V3-E3CB SERIES, V3-E3BG SERIES, WSM
8. EXHAUST
(V3600-T-E3B, V3800DI-T-E3B, V3600-T-E3CB,
V3800DI-T-E3CB, V3600-T-E3BG, V3800DI-T-E3BG)

[1] GENERAL

In order to meet with the strict emission regulations, Kubota has adopted the EGR on the V3600-T and V3800DI-T.
The nitrogen oxide (NOx) which is a hazardous component in exhaust gas is generated by oxidation of nitrogen in the
air, due to rise of the combustion temperature in cylinders. The EGR is a system in which the exhaust gas with lean
oxygen is cooled and returned to cylinders again in order to lower the combustion temperature. As a result, NOx can be
decreased.
And EGR has 2 types. One is an internal EGR, the other is an external EGR.

(1) Internal EGR (V3600-T-E3B, V3600-T-E3CB, V3600-T-E3BG)

GAS RECIRCULATION
Internal EGR consists of 2 stage exhaust camshaft.
At the exhaust stroke, 1st stage exhaust cam opens the
exhaust valve, and exhaust gas flows into the exhaust
manifold. At the suction stroke, intake valve is open and
fresh air flows into the cylinder, and also, 2nd stage
exhaust cam opens the exhaust valve, and exhaust gas
in the exhaust manifold is sucked back into the cylinder.
(1) Camshaft
(2) 2 Stage Exhaust Cam
M-26
DIESEL ENGINE
(EGR) SYSTEM
(a) Exhaust Stage
(b) EGR Stage
(c) T.D.C. (Top Dead Center)
(d) Intake Stage
(e) B.D.C. (Bottom Dead
Center)
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