If it doesn't work you're not out much. If it does you saved a bundle and learned something in the process. I do gas station service work. I have to go out of my way to make simple jobs appear difficult and complicated. If people knew how easy a lot of stuff was I'd be in the welfare line. I paid a guy $900.00 bucks for rebuild a pump and injectors. He tried twice. I paid a guy $900.00 bucks for rebuild a pump and injectors. He tried twice. That along with a distributor that sends the fuel charge to one cylinder at a time. A proper Stanadyne tech-manual will thoroughly explain all that. Find great deals on eBay for STANADYNE INJECTION PUMP MANUAL. Shop with confidence. PowerTech 4.5L &6.8L Diesel Engines - Level 12 Electronic Fuel System-Stanadyne DE10 Pump-CTM331. Took it somewhere else and paid them to fix it right for a fraction of the cost. Just cause you're paying a lot of money to get something done doesn't mean anything. John is a special person that has had a lot of varied experience. He and I have always had a difference of opinion about who should attempt to rebuild/patch up a Roosa Master pump. Guess that is the perfectionist coming out of me. I have always been one that has to do it exactly right, but that is just who I am. If you are looking for perfection or have a pump that needs more than just a reseal, it needs to go to someone who has had years of experience after having factory training like John and I have had. And even then, it can be a challenge. Only the most experienced can tell by looking if a part should or should not be replaced for for a long service life. Stanadyne Diesel Pump ManualsEven simple things like the transfer pump blade springs or delivery valves can be ready to fail or knowing how to check for the presence of water having gone through the pump. I remember a CB pump that came through the diesel room that gave me fits back in the 70s. It simply would not settle down on the tractor, nor would it on the test stand. The first thing I checked was the air seperator for blockage. To make a long story short, there was a shiny sliver of steel in the bleed hole that made it appear the hole was empty. Only found it when I tried to to run a pin punch through it. Not saying you can't do it, for I,too, have torn apart pumps on the tailage of a pickup truck,even in corn fields. The most memorable was a brand new 4320 at the Indiana State Fair. The dealer I worked for wanted to use it as a pull back tractor on the tractor pull strip and to also pull it as a demonstration. First 4320 I had ever seen as it had just been released from Deere that day, I pulled it apart, removed the shims and set the pump wide open. Talk about a new model making a show,it did.lol. Good luck and go for it. You won't learn Any younger. We also had many issues with the CDC and early CBC pumps also. I guess that's why they had so many updates - until they were discontinued. That all being said, there are many still around, with very high hours, still working fine. It's too bad somebody hasn't picked up the slack and made some repair parts for them. About being a perfectionist- there's nothing wrong with that. But, sending a pump to a certified pump shop does not guarantee such perfection. Any job is only as good as the person doing the work. Most pump shops do do NOT upgrade the plastic weight-dampener rings in DB and JDB pumps unless specifically asked to do so. That if far from what I'd call 'perfection.' On cars and trucks, they have to - I guess because someone 'dead on the road' is apt to complain more. I don't claim that anybody can fix one. Nor would I claim anybody can repair a starter motor, wire a tractor, rebuild an engine, etc. Some cannot even change a spark plug without getting into trouble. Stanadyne Db4 Fuel Injection Pump ManualStanadyne Fuel Injection Pump ManualSomebody who is a skilled mechanic should not fear working on an injection pump any more then many other mechanical component. There is NO magic involved. Main difference is - the service/repair informations is kept a bit more 'secret' then for other things. If you've got a pump that can be fixed with less then $40 in parts, then investing $10 in tools, and $50 in a tech manual - is a worthwhile investment - as compared to sending to a shop that will sometimes charge $700 for the exact same work on a flat-rate basis. Some people who like working on equipment also like learning new things - which also has a value.
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