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Re: Wabtec road battery loco testing - DEF & SCF in trucks
Author: Keith Ode
Date: 01-01-2020 - 19:03
George Andrews Wrote:
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> DEF ( Diesel Exhaust Fluid ) fluid as used in
> newer truck tractors & straight trucks ( anything
> over 8000 LBS GVW I recall ) is sprayed onto the
> SCF ( Selective Catalytic Filter ), which burns
> off much of the remaining bad exhaust gasses. HIGH
> HEAT is the operative word here; next time you
> drive alongside a big truck, look for the HOT
> label stamped into the tin box under the passenger
> door ( on most trucks ). Two big issues :
> 1) You canNOT let the truck run out of DEF; it
> will do MAJOR damage to the emissions system. Most
> engines will shut down before DEF runs out
> anyways.
> 2) The SCF filters have only half the life span (
> appx. 300,000 miles ) that truck builders
> predicted. Excessive idling and part - throttle
> operation ( i.e. - in traffic ) is harder on the
> system than sustained full - throttle ( open road
> ) operation. The SCF filter is a HIGH - dollar
> item to replace; even cleaning them is costing
> more than many trucking companies want to pay.
> Many companies are turning over their fleets just
> before the SCF filters need this expensive
> service. ( Buyer Beware ) DEF quality is also an
> issue; there is a difference the system notices.
> My daily work truck requires a Parked Re - Gen
> from time to time as indicated on the instrument
> panel. I have to allow 45 - 50 minutes for this;
> the system runs the engine at FULL THROTTLE during
> Re - Gen. Kind of a counter - productive way to
> reduce emissions in my opinion.
Same in the trucks I've driven recently. Not to mention that DEF is nasty stuff and hazmat.
The last company I was working for that was leasing International trucks would have Idealease at the warehouse weekly servicing the trucks with most issues related to the software and SCF/Re-Gen equipment. This was 2017-2019.
I worked for another company out of Hayward in 2013 and the International trucks they had were built in 1995 and 1996 with some Japanese box trucks from 2004. Never saw those trucks need any servicing outside of fluid/tires.
-------------------------------------------------------
> DEF ( Diesel Exhaust Fluid ) fluid as used in
> newer truck tractors & straight trucks ( anything
> over 8000 LBS GVW I recall ) is sprayed onto the
> SCF ( Selective Catalytic Filter ), which burns
> off much of the remaining bad exhaust gasses. HIGH
> HEAT is the operative word here; next time you
> drive alongside a big truck, look for the HOT
> label stamped into the tin box under the passenger
> door ( on most trucks ). Two big issues :
> 1) You canNOT let the truck run out of DEF; it
> will do MAJOR damage to the emissions system. Most
> engines will shut down before DEF runs out
> anyways.
> 2) The SCF filters have only half the life span (
> appx. 300,000 miles ) that truck builders
> predicted. Excessive idling and part - throttle
> operation ( i.e. - in traffic ) is harder on the
> system than sustained full - throttle ( open road
> ) operation. The SCF filter is a HIGH - dollar
> item to replace; even cleaning them is costing
> more than many trucking companies want to pay.
> Many companies are turning over their fleets just
> before the SCF filters need this expensive
> service. ( Buyer Beware ) DEF quality is also an
> issue; there is a difference the system notices.
> My daily work truck requires a Parked Re - Gen
> from time to time as indicated on the instrument
> panel. I have to allow 45 - 50 minutes for this;
> the system runs the engine at FULL THROTTLE during
> Re - Gen. Kind of a counter - productive way to
> reduce emissions in my opinion.
Same in the trucks I've driven recently. Not to mention that DEF is nasty stuff and hazmat.
The last company I was working for that was leasing International trucks would have Idealease at the warehouse weekly servicing the trucks with most issues related to the software and SCF/Re-Gen equipment. This was 2017-2019.
I worked for another company out of Hayward in 2013 and the International trucks they had were built in 1995 and 1996 with some Japanese box trucks from 2004. Never saw those trucks need any servicing outside of fluid/tires.
