Most of you have followed my issues with my 94 and local shop doing the repairs : https://www.dieseltruckresource.com/...d.php?t=121162

But I have specific question:

My truck is running great but still has either a injector or injection pump issue due to the lumpy idle. When you crack #5 and #6 injector lines at the injectors while truck is ideling the fuel does not have any pressure out of the fuel line. Cylinder pressure test shows all cylinders are equal and running good.

At rpms above 1200-1300 the truck runs great and pulls hard. The cummins shop is going to switch the #5 and #6 injectors and install them in #1 and #2 holes. If that does not change the problem then it has to be in the injection pump.

So my question is:

What in the injection pump would cause low pressure? Do delivery valves go bad?

I have NEW:

Injection pump was pulled out rebuilt and bench tested ( Not by Cummins)
Lift pump
80 HP injectors
over flow valve
rubber fuel lines
new valve springs (stiffer than stock)
new push rod tubs
over head set ( valves adjusted)
new head gasket
ARP studs
pump timing 15.5

Cylinder pressure checked out good



Thanks.....

 

If it narrows down to your injection pump, it could have been calibrated poorly. #5 and 6 not pushing the same amount of fuel as the others.

Another possibility is the injection lines, sometimes over tightening an injection line can crush or damage it to the point where the hole is collapsed a bit. I don't know if it can happen to those lines, but I've seen it happen on other diesel engines.

 

I would not expect to see alot of pressure with the line cracked , the pump does not create pressure , it creates flow , restriction to flow creates pressure. As long as there is fuel coming out of the lines then it is at least pumping, it could still be the pump is out of calibration , as mentioned , or it could be bad injectors, if the pump is out of calibration , i think the shop that just worked on it owes you some $$ , and if you find bad injectors , i think that you should be demanding some new injectors from whoever you bought yours from (they were new right?). Let us know what cummins finds, they should have the equipment at cummins to pop test B series injectors , so get them to do a pop test while they are out , if the pop pressure on them was wrong , they could fix it while they are out of the bore for the swapping process, instead of pulling them AGAIN if they find the problem transferred to # 1 and 2 cylinders.

 

Injectors popped off fine. Switched #5 and #6 to #1 and #2. A very slight change but still rough idle. Tons of power up top.... And now with the 15.5 timing it has much less smoke and more go...!!!! But I finally know that the lumpy idle is in the injection pump.

Also I moved my plate forward. Shop had it in the middle. Go to take out the bolts and look at what I find????????



Seems like the original shop is keeping up with their shop standards. $1600.00 for a half rebuilt pump and this is the bull shiz nit I get?????

Small claims court here I come....

$2050.00 to Cummins for three days of work
$2700.00 to orginal shop that had my truck for 3 weeks.

Dave

 

Wow, thats shameful. I just worked on one here that had the heads rounded right off of them.

However you handle it, I hope it turns out well for you. Thats just not right.

 

Dave , if they crammed THOSE screws into the housing on the back of your pump , then they owe you a new housing for your pump too, i'd be concerned that they cracked the housing and possibly put metal chips down into your pump if something broke off on the inside. that could explain why your pump is bad again...

 

I feel for ya Dave, they really put you through the ringer! Have you checked your gov. springs and gov. arm? Try the washer trick or a gsk kit. It's possable that could be causing a prob too. Check the nut on both springs to see if they ar tightend the same. Use a small screwdriver or caliper to check the threads on it. Good luck

 

I find more and more loose ends about the first shop. For $1600.00 on the rebuild of the pump the AFC threads should have been cleaned up and re installed with new STOCK machine screws. I had no issues with my old screws or threads.

I am going to get all of my money back from the first shop. Then have pay the bill at Cummins. If they want to play hard ball. We can take it to small claims court with all of my documents for the Certified Cummins shop......

Poor judgment
Lack of knowledge on my issues
Farmed out the work to other shops
Said I needed a new motor because I had cracked rings
did a leak down test with water into the cylinders and never did a "true" compression test.... And they charged me for two valve jobs. Once for the first push rod replacement. Then the second time for taking the head off. If they would have done a compression test and blow by test first they would have saved my several hundred dollars......
lost and not replaced bolts
told me to take my truck to the Cummins shop after they compeleted their work because they where convinced I had dead cylinders and there workmanship was on point..... again, dead cylinders from a water leak down test
Also told me I could just get a new motor for 12G
Rebuilt motor for 6G
bearing and rings for 3G
towed my truck with a tow strap without my truck being able to run

just very poor judgment.... and taking on work that is over their head. They are a true "plug and play" diesel shop. Performance Boxes, cold air intakes and exhaust is what they should focus on. Nothing else.....

From everything you guys know about this situation. Anyone feel that I am not entilted to a refund for first $2700.00 and also recoupe the $2050.00 for the Cummins Bill.....??

Thanks.....

 

Absolutley, and pay for a new ip or pay for Cummins to rebuild it!

 

Can someone tell what the procedure would be for fixing bad holes in pump for the AFC housing? When the Injection Pump shop had my pump they should have cleaned the holes up for $1600.00. I had no issues with the holes until now.

Also where do I stand with a total of three shops taking part in my trucks first go around. SD took my truck. Then they took the Injection Pump to shop 2. then took the truck to Shop 3 for the first "water leak down" test and recommendation of a new motor because of the bad rings . I am thinking I put them all on the chopping block. If they all pay up a little now, it will be much cheaper than taking all 3 to small claims court....

I want the shop owners to understand I am not trying to get my truck fixed for free. But fixed right the first time. Not the third at a cost of $4700.00

Dave

 

If there are threads that are ruined in your AFC Housing, because they forced the wrong bolts in there , they owe you a new housing. no questions asked.

 

I just got off the phone with them and told them about the AFC screws. And all of the things Cummins found and fixed. I explained to them that there diagosing methods where limited to say the leaste. They cost me a lot of un needed labor and time without my truck. I told them that some money will be coming back my way and my Pump will be replaced. And if they did not want to help me I would gladly see them in small claims court. They said "do what you have to do".

I am just wondering if I should go small claims court, or go get and attorney.....???

What a mess.....

Dave

 

Go to Small Claims as long as you're not looking for more than $5000 (Small Claims Court limit in CA). If your losses are higher than that, an Attorney might be appropriate but then you have to pay the Attorney. Unless you have some way to show that the damges, both mechanical and loss of use, are significant, then you'll probably end up losing money. IMHO, Small Claims is the best way to go. Remember, neither you or the Defendant can use an Attorney in Small Claims and with what you have presented here, I would think it to be a no brainer for the Judge to find in your favor. Now, collecting on the judgement is a totally different issue......

 

Go to a few local lawyers and explain to them your situation and if they think you can win they will help you. Lawyers want a rep as much as they want money. It's wortha shot, I've delt with a few in my day and with no shortage of them you should'nt have a prob finding one.