300-Series: it's official
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• Leyland Trucks' succes to its 98-Series diesel engin( as reported in last week's issue, is the Leyland 300-Serk based on the Cummins BSeries which the two companies have developed joint13 over the past four years.
It has potential for higher power outputs with turbocharging and charge-cooling to 134kW (180hp) suitable fa Freighter models but initially from this autum will be available in the Roadrunner light truck range-rated at 86 to 97kW (115 to 130hp).
Compared with the 98Series, the B-Series uses 20% fewer components and i designed to give maximum d rability and reliability.
The test programme, the most extensive undertaken a new engine for a Leyland, centred on durability tests ar abuse tests involving regular engine overspeeding and gruelling pave testing over 170,000 hours and 260,000 k (160,000 miles).
The most significant modif cations to suit Leyland are tc the B-Series valve gear, including chilled iron casting fo tappets and camshafts.
All gears are chemically treated and shot peened to improve teeth strength. The camshaft gear is heat shrunk to its shaft.
In addition, the original CP DPA fuel pump has been replaced by a DPS unit which gives improved operational stability at higher engine speeds.
"It is a straightforward engine design, built with the most sophisticated means at our disposal and will outperform any other engine we have experience of," Leylana product development directo] Peter Capon told CM.
Cummins will build both en gines, identical but for the name, at its Darlington plant.