DAF repowers for Leyland Nationals
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I/ A new repower package for Leyland National Buses has been developed by BEL and DAF Diesel. The package is based on the 11.63 litre DAF DKDL 1160 horizontal engine.
Paul Bertin, BEL's marketing manager, estimates that there is a conversion potential of 2,500 to 3,000 Nationals with Leyland 510 power in service. These Leyland 510-engined Nationals are the main targets of the DAF repower programme. The DKUL engine is said by BEL to replace the Leyland 510 unit with a minimum of conversion work.
Apart from requiring various new fabricated bracketry the DAP' engine uses existing National transmission and cooling systems. Power and torque ratings of the DKDL are 165bhp (121kW) at 2, 000rpm and 4831b/ft (655DNMNM) at 1,300rpm respectively. These figures are said to be adjustable to match the installed outputs of the 510 prior to repower.
According to Bertin the main advantage of the DAF repower for National operators is vastly improved reliability and engine life. Bertin reckons that the typical service life of the DAF engine will be five to six years against the claimed 18 months to two years of a completely reconditioned 510 unit.