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Suspected air lock on diesel

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Kestrel CT

05-22-2007 05:26:43

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I'm no diesel mechanic but I am a nut on routine maintenance, like filter changing. I just replaced the 3 filters on my 1983 Westerbeke, 1 primary, 1 on the electric lift pump, and 1 in-line filter before the injector pump.

She'll run for 2-3 seconds and die. I'm sure air was introduced but my manual says "no need to bleed" due to the electric lift pump. Been changing these filters for 15 years the same way and never bled anything. Don't really know the sequence anyway. I tried opening the fuel cap to allow more air but that didn't work.

Would apppreciate any tips on where to look first. The lift pump appears to work and "ticks" when key is turned. Fuel tank is 3/4 full. Glow plug solonoid also clicks and draws its usual amps.

I'm kinda' stumped now.....

Thanks guys....

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Kestrel CT

05-22-2007 11:03:13

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Re: Suspected air lock on diesel in reply to Kestrel CT, 05-22-2007 05:26:43

Thanks all for the ideas.....I'll give it another effort tomorrow and see what happens.

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T_Bone

05-22-2007 13:09:18

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Re: Suspected air lock on diesel in reply to Kestrel CT, 05-22-2007 11:03:13

Hi Kestrel,

Open the filter drain then run the fuel pump until the fuel runs clear, shut the filter drain then start engine.

If you sucked air into the injector lines to the nozzles then you will need to bleed air at each injector connection.

T_Bone

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Joe (Wa)

05-22-2007 08:29:28

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Re: Suspected air lock on diesel in reply to Kestrel CT, 05-22-2007 05:26:43

A slight pressure in the fuel tank while cranking usually gets them going. A rag around the fill neck & a puff of compressed air while someone cranks, no more than 1 - 2 psi.

Joe

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Ludwig

05-22-2007 07:33:03

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Re: Suspected air lock on diesel in reply to Kestrel CT, 05-22-2007 05:26:43

If the manual says its self bleeding put the battery charger on for a couple hours, then put your foot into the go pedal and crank. Hold the throttle open until its running smoothly.
I screwed up a couple weeks ago changing the filters on my '85 Mercedes-Benz 190D. Its also self bleeding so its not a big deal but I forgot to hold my foot into it and it died on me. Then I had to crank and crank and crank until it caught again and ran like crud until all the air was out. Now its fine though.

Another thing to do is fill your filters with diesel kleen when you replace them, that'll displace a bunch of the air first and make it alot less of an issue...

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Chris(WA)

05-22-2007 06:48:19

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Re: Suspected air lock on diesel in reply to Kestrel CT, 05-22-2007 05:26:43

Open the line from the inline filter to the injector pump then run the lift pump till you get a solid fuel flow at that point. Then crack the lines at the injectors and crank the motor. As soon as you get fuel coming out at the injector with the shortest line close off that line . Continue to do this till you have all the lines bled. She should start and run after the first couple lines are bled. Good luck!

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