6.2/6.5 Diesel DB2 Fuel Injection Pump Identification, Cover removal and tips

I messed up. I state in the video that the cold start solenoid closes or restricts the flow of fuel to the return system. It is the other way. The cold start solenoid opens up the return line flow which causes the timing to advance.
Sorry, I got thinking about camera stuff and just took the wrong path when talking.

[@bertenerny7867]

Tim, I have learned a wealth of information on your videos concerning the 6.2 and 6-5 injector pumps. Thanks for the walk-thru(s). My M1009 is DED and I'm learning as I go. I'm no mechanic to say the least,,, I'm taking baby steps. Thanks again, Regards, Bert from 'Bama

[@timsteachablemoments1786]

Thank you for watching. I’m glad they help.

[@keithjurena9319]

The green wire powered solenoid holds the fuel return check valve open, reducing the case pressure during cold operation. This slightly increases delivered fuel and advances timing. The check valve is spring loaded so fuel pressure must counter the spring force. The black pieces clogging the return are from tge governor elastomeric drive ring, this was changed in 1985. Running a pump without the ring or modification will cause wear on the governor cage which settles down into the advance piston, causing case wear.

[@timsteachablemoments1786]

You are exactly correct! I started out saying it wrong and just kept digging deeper. I will write something in the description. Thank you.

[@carbie5614]

Hello, how does holding the check valve open increase the fuel pressure, seems to me with the check valve open there would be less pressure? Also how does tge green wire hold the check valve open, when you got a 9/16 wreanch and took it off i did not see an electric connection to that check valve? I also copied and pasted this so i would not forget how to find thus. I had to write it because I can not copy someone else's comment. The green wire powered solenoid holds the fuel return check valve open, reducing the case pressure durning cold operation. This slightly increases delivered fuel and advances timing. The check valve is spring-loaded, so fuel pressure must counter the spring force. The black pieces are from the elastomeric drive ring, this was changed in 1985. Running the pump without the ring or modification will cause wear on the governor cage, which settles down into the advanced piston causing case wear.

[@keithjurena9319]

Two effects from case pressure are timing and injected quantity. Case pressure resists filling the plunger cavity. Timing is also advanced with fuel transfer pump pressure which varies with engine speed. As the timing advance is working against case pressure, lowering case pressure advances timing. Inside the case cover are two electromagnets. One is energized to run and when off, spring force closes the throttle. The other electromagnet pushes on the glass ball in the fuel return check ball only when energized.

[@cedarlaneenterprises6258]

Thanks for the info Tim . Have 2 6.2’s ( one 1009 , one ex government k30 ) and a few 6.5’s . Rarely ever had to mess with the DB2 pumps , the DS4 pumps are another story. Always good to know everything you can about these old engines.

[@timsteachablemoments1786]

Thank you for watching.