To remove the Rotary CAV DPA injection pump from Ford 3 and 4 cylinders. Check the timing marks, in fig 2, if they are not in line take a small chisel and strike a mark on each surface that will be in line. Turn the fuel supply off if you have not already done so. Remove all lines going to the pump.
I know the manuals say you need specialist equipment to create a hydraulic lock to fix the point of injection to time these DPA pumps properly, but I've never seen it done.
These pumps are driven by a quill shaft with a master spline so its difficult to get it wrong.
These are basic instruction for the timing and installation of the Delphi (C.A.V., Lucas) DPA model pump. Since the procedure may vary depending on the engine please refer to the correct engine service manual for your engine. In an emergency however, if the timing marks are clearly marked on the engine and pump mounting flange, most. If you have got fuel to the bleed screws on the pump,slacken off the injector pipes and see if you are getting fuel up to the injector,make sure that you have got all the air out of the system.Put plenty of fuel in the tank.Have you got a lift pump fitted? Recheck your timing on No 1 cylinder, injection should be around 23 deg before TDC.
The master spline always lines up with the delivery valve which is receiving the injection and there is a scribe mark on the seal housing indicating the point of injection for No. 1 cyl. These then coincide with the master spline location.Looking from the drive end of the pump you'll find the mark at 10 to the hour on 4 cyl. engines and 27 past for 6 cyl. engines.
4.6 Ford Timing Marks
No.1 Point of injection marks.If the pump has been fitted to the engine before all that is needed is to line up the marks on the pump flange and gear housing and lock up the three 1/2 AF - 13mm. nuts.
One mm. of rotation of the pump body at these marks represents about one degree at the crankshaft.
External timing marks.On a new engine the pumps are individualy fitted before the timing marks are scribed so they are a matched pair.
Cav Dpa Timing Marks Off Road
If you have to fit a strange pump, and the engine doesn't perform, it is possible to reset these timing marks visualy.To do this you will need to set the engine up at point of injection No.1, and remove the inspection plate from the side of the pump, (two 5/16 AF set screws). You will then be able to see the pump rotor which will have lettered scribe marks on it and a large circlip with one square end.
Slacken the pump boddy and turn it till the square end of the circlip lines up with the scribe mark on the rotor. The mark is lettered A on 4 cyl engines and D on 6 cyl.
Lock up the pump in that position and make your own new timing mark on the pump flange, a sharp chisel does the job nicely.
Internal pump timing marks
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