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Crawlers, Dozers, Loaders & Backhoes Discussion Forum

Re: Lucas Diesel Pump Problem

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03-10-2013 15:49:07

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In both cases above a stuck injector needle valve could be the cause,if an injector needle valve is stuck in the delivery position it will allow compression to pass out through the injector and into the injector pump causing an air lock in the delivery head of the pump,(you can't do this test if the pump is off the engine)see if you have an injector blowing back,undo the injector pipes at the injectors,put a squirt of oil into each nipple of the injector,protect your face,get someone to crank the engine over on the starter while you watch the injectors,if one blows back that is the trouble,if none blows back the trouble is in the pump,often with a Lucas CAV pump the metering valve can stick in the stop position,the newer pumps with the electric stop usually had a manual lever stop in front of the throttle lever on the top cover of the pump so the engine could be stopped manually,it does not have a cable attached,check it out,if the pump is off do not turn the engine till it's back on again and timed.


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03-15-2013 16:56:27

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 Re: Lucas Diesel Pump Problem in reply to AJ., 03-10-2013 15:49:07  
AJ Item no. 10 do you know what threads are on the male part that screws in to the pump? Almost 1/8 NF pipe but I am not certain. Pump shop kept my fitting and I am having trouble finding the fitting.

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03-10-2013 18:31:34

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 Re: Lucas Diesel Pump Problem in reply to AJ., 03-10-2013 15:49:07  
BINGO---will remember this check---thanks

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