| Author |
Message |
    
south0124
New member
Username: south0124
Post Number: 1
Registered: 08-2008
| | Posted on Sunday, August 31, 2008 - 04:12 pm: | 
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Just bought a Lincoln pipeline welder with a Bedford 220 4 cylinder engine. Had not been started in over 16 years, cleaned the fuel tank added a little either and she finally started. After a couple of minutes the engine settled in with a nice even run at 1675 RPM or idle at 800 RPM. Started and ran the welder three or four times for a total run time of a couple of hours. Took it out for some fence repair and after 30 or 40 minutes of welding (about a 40% duty cycle) the engine took off, not sure what RPM it reached but black smoke was belching. Hit the lever to idle then kill (multiple times) and the engine continued the over rev. Finally jerked the fuel line off the tank and the engine died after burning the fuel in the filter and lines. The pump is a CAV DPA:3249F760 Ser:R379290T Mod: A60/600/7/1760. Is this a common problem and what does it take to overhaul and/or keep this from happening again. Any advice would be appreciated. Mark |
boatbum
Member
Username: boatbum
Post Number: 11
Registered: 05-2006
| | Posted on Sunday, August 31, 2008 - 06:59 pm: |
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Sounds like the governer stuck wide open. Some of them are solely mechanical while others are electro-mechanical. After sitting for 16yrs you could have an electrical short, or bad ground, or a mechanical failure. |
south0124
New member
Username: south0124
Post Number: 2
Registered: 08-2008
| | Posted on Monday, September 01, 2008 - 08:07 am: |
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The welder is a 1977 model so I assume the engine is a 76 or 77 vintage, no wires going to the injector unit only fuel lines and the linkage for the kill/idle/run lever. I am confused why the mechanical lever did not shut off the fuel when the engine went into the over rev condition. It was welding perfectly at the time the engine ran away so I don't think it was short or ground problem. A diesel engine is so basic that the only mechanical problem would have to be internal to the injector pump. I bled the air out of the fuel lines and it appears to run perfectly now but I am afraid to let it run more than a couple of minutes. |
miro
Senior Member
Username: miro
Post Number: 342
Registered: 11-2001
| | Posted on Monday, September 01, 2008 - 08:25 pm: |
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Once a diesel engine wears a bit and begins to blow oil past the rings, then at high speeds it will start to eat itself. Even with cutting off the fuel there might be enough oil getting past the rings to keep running. Not a pleasant task to shut it down - the only solution is to choke off the air.
But in any case have a real good look at the governor - that's likely the answer in your case. |
south0124
New member
Username: south0124
Post Number: 3
Registered: 08-2008
| | Posted on Wednesday, September 24, 2008 - 05:47 am: |
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After some research and finding diesel in the crankcase decided to pull the CAV injector pump, DPA 3249F760. The re-build hurt ($450) but the metering rod was completely stuck which caused the over rev along with some other issues. When I pulled the pump the drive gear had a master spline so I did not note the orientation. Went to re-install and found that the female mating gear did not have a master spline or markings at all. How in #$%% do I time the injector pump without tearing the engine apart??? |
