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5.2.1 Coolant Connections
Coolant must be supplied from the engine to the DEF tank header in order to heat the DEF in cold
conditions. The coolant is supplied via the coolant valve which is controlled via the DCU.
Coolant is taken from the coolant outlet on the engine to the coolant valve, then to the tank header,
returning directly back to the engine at the water pump inlet.
The table below outlines locations specifically for this purpose. If you wish to feed and return coolant
using ports normally reserved for cab heater connections please contact your applications engineer.
Line
#
A
STOR (ISO
Engine Coolant
feed to Coolant
Valve
B
STOR (ISO
Coolant Valve
D
to Tank Header
push fit hose
Tank Header
Return to
F
push fit hose
Engine
Total hose length must not exceed 8000mm, this may include 90° fittings at each end.
Additional fittings within this line length will reduce acceptable line length.
See below Fig 5.2 for identification of acceptable location to use on the engine for feed and return.
A - DEF Coolant Valve
Feed
(out of cylinder head)
G - DEF Tank Coolant
Return (into top of water
pump
H - Alternative DEF Tank
Coolant Return
C- Coolant
Valve inlet
A&I manual Publication TPD 1832 – Production issue 3.
Line Start
Size
Connection point
M18x1.5
Top centre
cylinder head
6149)
M18x1.5
Left front side of
cylinder head
6149)
5/8" OD for
Coolant Valve
outlet
5/8" OD for
Tank Header
coolant outlet
Table 5.2 – Coolant connection Details
D- Coolant
Valve Outlet
Fig 5.2 – Coolant connections locations
1204F - DEF System Supplement
Line End
Connection
#
Size
point
5/8" OD
Coolant
C
for push fit
Valve Inlet
hose
5/8" OD
Tank Header
E
for push fit
coolant inlet
hose
Top of water
½" – 14
G
pump
NPSI
housing
'T' into shunt
5/16" -12
H
line
STOR
connection
E - Coolant
Inlet
Recommended
Diameter
5/8"
(15.8mm) ID
5/8"
(15.8mm) ID
5/8"
(15.8mm) ID
5/8"
(15.8mm) ID
B - Alternative DEF
Coolant valve feed
F - Coolant
Outlet
Page 29 of 41
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