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SUBJECT: NPB0026 PLD Engine Update            

March 22, 2016 

Mechanical PLD’s 

As communicated within the 2016 pricing release, all mechanical PLD engine models had been removed from the pricing overview, but can be quoted per request.

We mistakenly thought that it would be helpful as well to remove all mention of these engines from the website, but this only furthered the confusion.

Effective immediately, all mechanical PLD engines have been added back to the website, the PLD calculator, and your price sheets (please refer to attachments).

Clarke electronic PLD’s can operate at 1760, 2100, and 2350 RPM, however in the U.S. and U.S. territories, the models below can only be sold at 2100 and 2350 RPM. 








SUBJECT: NPB0024 KA4H-UFKA24 Update             

March 22, 2016 

Our first batch of KA4H-UFKA24 engines have been produced and shipped. This non-emissionized engine is rated at 45 bhp @ 2800 rpm and 45 bhp @ 3000 rpm.

Key Changes

  • Due to the size of the flywheel, a torsional coupling is currently not available. Therefore, we will not have a vertical turbine version of this engine. We have removed all vertical turbine options on the updated pricing sheet.
  • The standard flex exhaust was originally stated as being 3", however we have been able to reduce the size to a 2.5".
  • This engine has a unique low fuel pressure alarm, which must be tested during the engine start-up procedure. 

SUBJECT: NPB0023 Energized to Stop (ETS) Update             

March 22, 2016

In 2015, Clarke began the process of transitioning all US built JU4H, JU4R, JU6H, and JU6R mechanical engines from an Energized to Run (ETR) fuel system to an Energized to Stop (ETS) fuel system.   

ETS Fuel System

  • The engine will start and reach its rated speed without needing to energize any electrical component(s).
  • Engine requires power to shutdown, from the engine instrument panel or the fire pump controller.
  • Engine also is supplied with an emergency stop knob. 
ETR Fuel System
  • Electrical component(s) must be energized to reach rated speed.
  • Engine also is supplied with an emergency stop knob.

There are unique differences between Energized to Run (ETR) and Energized to Stop (ETS) engines.  

(1) ETS engines must have Terminal 12 in the engine instrument panel wired to Terminal 12 in the diesel engine controller in order to stop the engine. The Terminal 1 connection is still required. ETR engines do not require the use of Terminal 12 and should not be wired. Please refer to the appropriate wiring diagram provided in the document pouch with each engine.

(2) ETS JU4/JU6 models have an emergency stop knob to be used if the ETS solenoid fails to stop the engine. ETR engines do not have an emergency stop knob, since the engine will stop when power is removed.  

Overcrank Test
The procedure for conducting the overcrank test on an ETS engine has changed. All Energized to Stop (ETS) engines now include an emergency stop knob which must be pulled out and held during the 6 start attempt during the overcrank test. This allows the engine to crank, but will prevent the engine from starting by holding the fuel solenoid in the no-fuel position. No engine wiring should be disconnected during this process.

SUBJECT:  NPB0022 DS0R Baseplate Requirement

March 22, 2016

Clarke has three series of UL Listed, FM Approved engines with available radiator cooling packages. 

For the JU4R and JU6R engines, the radiator mounting configuration allows for the radiator to sit atop mounting brackets affixed directly to the engine feet.

Due to the physical size and weight of the radiator cooling packages for the DS0R engines, the radiator must be mounted directly onto either a horizontal split case (HSC) or a vertical turbine (VT) base.

Therefore, the base is a mandatory option for the DS0R-UFAA67 and DS0R-UFAA59 models.


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