[Vwdiesel] Rabbit droppings # 48 ---( nifty hillbilly test of injection pump pressure )

H.Hagar h_hagar at prcn.org
Thu Mar 18 21:37:37 EST 2004

I have in mind old VW 's  -- so there.

Timing device in VE pumps is hydraulic , it works on pressure from
vane pump.

With engine warm  let sit in idle for 30 seconds. Then pull cold start
all the way out and listen real carefully to engine sound.
If there is no change at all , you may assume that internal pressure
is adequate.
If there is any effect on engine , I suggest that you test pressure with a gauge.

The cold start knob cam will push on timing piston on starting when there is no
pressure to do the job.  As soon as pressure is up the piston is usually out
of reach of the cam. Hence no effect what so ever.

Pressure at idle should be  about 2 to 3  bar.


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