Hi,
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.
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.
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.
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 marksI have a CAV injector pump on my Massey Ferguson 235 a DPA 3233F360. I rebuilt a rebuild job where the previous mechanic did not replace the crank, oil pump or water pump. He undoubtably timed the engine according to his 'back yard' way of timing. The engine will run with starter fluid but I am having trouble getting the injector pump timed.
I have done:
Rechecked timing gears and marks.
Bled the fuel lines.
Replaced the fuel lines.
Ordered a seal kit for 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.
Oct 05, 2018 Also, CAV pump reading a “C” on the rotor, expected a “G”. I don´t understand this. I also couldn´t find any info on rotor markings for the CAV DPA pump. I´ll have to continue searching for this. Going to get new timing pin. I don´t think it is worth worrying about the old one messing up the front end as it could have been some time. Cav Dpa Timing Marks Off. 8/21/2019 In reality the only difference in any 3 cylinder Ford using a CAV DPA pump is the cam ring settings for maximum delivery and that would have no bering on your high idle problem. Ford 4600 Fuel CAV Injection Pump in reply to RodInNS, 11. I pulled the fuel injectors expecting them to be hard to remove but they. Jan 06, 2009 First off, don't try and pull it to bits. The DPA's are bad enough to do in a pump workshop, and not the thing to play with if you haven't got the special tools etc. This process is often used for 'air timing' pumps also - if the timing marks are missing. Inter Bloke Registered. The CAV DPA - I have a manual here.
These pumps are driven by a quill shaft with a master spline so its difficult to get it wrong.
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.
The idea of the timing pin was an advanced idea by the CDC engine designers to assist doing this type of job. The pin would lock the engine at TDC, the pump would be fitted with it's timing marks aligned, also locked in place. When the pump was securely mounted both locking pins would be released - prime & play. Jun 02, 2013 The idea of the timing pin was an advanced idea by the CDC engine designers to assist doing this type of job. The pin would lock the engine at TDC, the pump would be fitted with it's timing marks aligned, also locked in place. When the pump was securely mounted both locking pins would be released - prime & play.
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.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.
s1.jpg
External timing marks.
On a new engine the pumps are individualy fitted before the timing marks are scribed so they are a matched pair.
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 marksI have a CAV injector pump on my Massey Ferguson 235 a DPA 3233F360. I rebuilt a rebuild job where the previous mechanic did not replace the crank, oil pump or water pump. He undoubtably timed the engine according to his 'back yard' way of timing. The engine will run with starter fluid but I am having trouble getting the injector pump timed.
I have done:
Cav Dpa Timing Marks Off Car
Rechecked timing gears and marks.
Bled the fuel lines.
Replaced the fuel lines.
Ordered a seal kit for the pump.