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1971 820 injection pump swap from roosa to cav

J

Jmac4430

New User
So the IP on my little 820 is about shot. It doesn't run smooth and the return fitting keeps plugging up with governor material. I don't really have the funds for a rebuild at the moment but I have a friend that has a cav pump off a 3 cyl Deere with the gear fuel lines and all he'll give me.

I hear these cav pumps are better than the roosamaster pumps. Is that true and swapping the pumps should be ok right? Thanks!

Oh because I know this'll get asked. At the moment I don't know what tractor the cav came off of. He's supposed to find out tomorrow. All I know at the moment is that it's off a 3 cyl Deere.
 
Might be better in the long run to repair the original pump. I do a lot of pumps like what you have for about 300-350, repaired, tested and returned. Need more info on what the other pump is from. It's most likely a Roto-Diesel CAV DPA copy made in France, the first Roosa design..
 
Wow! The cheapest quote I've had is 6 to 700 to rebuild it. For 3 I would just rebuild this one. I know what you mean by going with the original pump but cash is tight so if it'll work I'll do it. I should find out today what the pump came off of. All I can tell you is it looks like other cav pumps I've seen on 2350s and such. Just 3cyl of course. Thanks! ]
 
I believe you're right but he has the lines luckily. He has the front plate the pumps attached to so I'd have the studs I need and all the lines id need.
 
Like Dieseltech I redo those pumps for around $300 but I'm not looking
for a job. I wouldn't go to all the labor and expense of swapping everything
to have an inferior (as far as I'm concerned) CAV pump.
 
The CAV and German-Bosch rotary pumps, along with Diesel Kiki and Rotodiesel - were all built under license from Stanadyne. The only rotary that was not that I know of
- is the American Bosch. I can say this. I worked for three Deere dealers and we had just as many problems with CAVs as we did with Stanadyne-Roosamaster. Just
different problems with each. Stanadynes weakness (in DC, DB, and JDB pumps) was the optional plastic governor weight-retainer that Deere ordered (was not used in all DB
and JDB pumps). Stanadyne - at some point in time - improved the transer-pump area to spring-loaded, steel, self-adjusting vanes whereas CAV did not. I think you'd be
crazy to change over pumps just because your's needs $25 in new parts to fix back to original. Or for another $50 you can eliminate that plastic (pellathane) part
forever.
 
I've never heard that the Bosch VA-VE, or the Nippondenso/Diesel Kiki/Zexel Bosch copys were under Stanadyne license. The Bosch VA/VE work nothing like the Stanadyne/CAV pumps do. The one Bosch rotary that's close would be the electronic VP44, as it's a constant end variable beginning of delivery pump like Stanadyne. The VA/VE are like most inline pumps, constant beginning, variable end. At least it's never been mentioned at any of the Bosch service classes I've been to.
 
Ok so I'm not an IP guy. Who can point me in the right direction to get mine fixed cheap. I thinks it's ridiculous that it costs upwards of $700 to rebuild one of these.
 
Not sure where you have got your pricing from, but don't be priced out of doing what is right. To repair your pump doesn't need to cost an arm and leg. ANY CAV or roosa/ stanadyne pump can be repaired by a REPUTABLE pump man for 400-450 or less. Dont fall prey to those who boost you can repair it for a few bucks. Dont fall prey to those who give you staggering high prices. I dont claim to know it all, or even try. I can tell you I have been inside of hundreds and hundreds of rotary pumps. Bosch VA-VACR-VE pumps are as different from the Roosa design as night is from day. Great pumps, whole different cat. either the CAV or Roosa are good pumps and will out last you if taken care of correctly. Sooner or latter they do need maintenance. Its now time for yours, do it right and you will never be sorry. Call around, get pricing and warranty details. Pick some one who is a good fit for you. If you cant find someone to treat you fair, please give me a call. Good luck, Al 231/757/0064
 
Thanks Al! I appreciate it! The two quotes I've got are from places here in Missouri where I live. One was Hart's diesel which is supposed to be a really good shop and the other is northeast diesel. Hart's said 6 to 700 and northeast said 675 if I remember right.

I'll definitely give ya a call if I can't get something figured out.
 
Can't help you never heard of it. Still true. CAV and Bosch just bought licenses to copy certain principles of the Stanadyne and are very different. Part of the agreement with the license was non-competition. E.g., Stanadyne agreed not to sell pumps in parts of the rest of the world other then North America, and CAV and German Bosch agreed not to sell in the US on certain types of equipment. At some point in time, that agreement obviously ended. American Bosch seemed to be exempt from all this. Not sure how that worked. American Bosch was created from seized assets of the Bosch in Germany that sided with Hitler.
 
The 152 cube engine in the 820 was tested at a max of 39 horsepower. Then engine in the 2240 is larger at 179 cubic inches and thus the more power. Turning up the pump
or adding a d 2240 pump is not going to make your 820 put out 51 horsepower.
 
Years ago one of my coworkers and I would tease the boss about how American Bosch got started, as he was a HUGH AB fan, he didn't think it was funny as we did though. Just take over and change the name...
 
(quoted from post at 05:23:35 09/14/16) The 152 cube engine in the 820 was tested at a max of 39 horsepower. Then engine in the 2240 is larger at 179 cubic inches and thus the more power. Turning up the pump
or adding a d 2240 pump is not going to make your 820 put out 51 horsepower.
Click to expand...

I wasn't swapping them hoping for more power. I was swapping because the cav was free and a rebuild of the roosa was expensive. Its been 11 years since I worked at jd reman but I still know some fuel guys there's so I'm just gonna try to get one of them to rebuild it because I don't want to go through the hassle of swapping everything.
 
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