Ford 4600 Fuel CAV Injection Pump

georgmr

New User
I'm going to install a new injection pump on my '76 4600SU. Having removed the old pump I expected to see markings indicating 3233F390, but instead I see markings indicating 3233F209 (picture attached). I bought this tractor from a guy that bought it at auction and this isn't the first part I've tried to replace that does not seem to belong.

Am I looking at the right markings? Should I just go ahead and order the pump indicating by the part number on the New Holland parts website? I'm replacing the injectors also.

Mark
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Honestly, I wouldn't give it much thought. What I would do is have this pump rebuilt. Most of them only need a cleaning and governor set. A new pump from the mafia will be EXPENSIVE...
If you insist on going that route, order the pump with current part number as indicated in the parts system.
You could also go through an injection supplier and they can order or spec a pump for you based on the information on the pump plate...

Rod
 
Thank you Rod.
I am reluctant to assume this is the correct pump and have it rebuilt. I was never able to get the engine RPM up to spec. Best I could do was 2100 RPM with the high speed adjustment screw fully adjusted.

Mark
 
The only differences between pumps on Fords that used that pump was fueling and static timing... and at that, I think all 3 lungers used the same timing. If it wouldn't run up to speed then it's got an internal problem or it was timed wrong. There is also a load advance in that pump that advances and retards timing based on load. There are a variety of different positions for the governor springs on that pump's internal tombstone that are placed depending on the specs on the pump plate or the engine's fuel test plan. If I seriously thought it was the wrong spec for the engine I'd have the pump shop use the test plan in their service books for a 4600 just in case the numbers on the pump tell them otherwise. 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. If the static timing on the gears is wrong you'll have to change that... but basically the dots need to line up on the pump gear and the idler gear. As you know, the pump itself is dowled to the drive gear.

The only other question I would ask is if the engine is making heavy smoke at maximum speed.... as in... is the speed limited by load or simply limited by lack of fuel (no smoke). A severely restricted air intake will also choke it down.

Again, C.A.V. DPA pumps like that are flat out generic to dozens of different engines... Ford, Perkins, Deere, etc. Fueling characteristics are all variable and set to plan by the various pump settings.

Rod
 
Rod,
I really appreciate your help. This engine does not smoke except for light smoke at low idle and when the throttle position is changed. As a matter of fact, I pulled the fuel injectors expecting them to be hard to remove but they came right out without any problem.

This CAV pump has multiple external leaks and my crankcase level is gradually rising. How many companies make the new replacement pumps? I see a wide range (almost $200) of prices for new pumps. Are all these pumps the same quality? Do you think it is better to get someone to rebuild the old pump because it's higher quality than the available replacements? Sounds like I'll be find with the correct part number.

Thanks for your help

Mark
 
Repop pumps are plentiful and cheap. They usually can be had for less than a rebuild at a high priced (but thorough) pump shop. I have sold a couple and know of others sourced from ebay, etc. They all run fine. Biggest headache is the location of the return fitting. It's either in the top cover, or a banjo fitting on the left side. Most of the repops have the banjo style. That return line set is not too expensive from NH.
 
My personal feeling is always to rebuild even if it costs a bit more... but at the same time I'm sure Rick is giving you good info based on his experience. It just gives me the creeps to buy a 'new' pump at budget prices knowing it probably came from China... and knowing that half the time they can't even roll a bloody wheel properly..
That said, I do have a china head on a Cummins 4B that is working fine as well as a few hydr pumps...

The big thing for me in dealing with a reputable pump shop is that you will get a pump back that is properly rebuilt and properly set for your application. EBAY mileage may vary.....

Rod
 
CAV spec card listing I have shows your pump # is for 4000, 4400 loader and 4500. My guess is the pump governor control spring is in the wrong position if engine speed comes up short. Most are in code position # 7, but not always. I'm with Rod, only time I might exchange a rotary pump is if there's a hard starting hot problem, meaning a worn head assembly. I'd always rather try to repair rather than exchange when possible. Injectors have replaceable tips, those too can usually be repaired at less cost than exchange..
 

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