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I Recently did a dod delete On 09 Silverado. Including tower plugs, non dod lifters, gen 3 cam, 3hole 4x cam gear, disabled the dod in the ecm,and i replaced the oil pump. The pump I used a m295 I?m wondering if that?s why I?m not getting the oil pressure I?m only getting 10 cold then when it warms up it goes to just above 2. All of this is according to the vcm scanner. I will post the log
Pinched pickup o-ring or the wrong size.
I am pretty sure it was the right one two came with the pump but it did come with instructions and most importantly it had pictures as well
Put a manual gauge on it to double check the pressure.
If it matches, then you could have a pump o-ring problem or even a camshaft retainer plate problem that is leaking oil pressure.
I did the same thing when I did my dod delete. I used the m295 which is the wrong oil pump especially if you have high mileage because the pump used in the dod engines are high volume pumps. The one you need I believe is the melling 10296 which is used for dod replacement pumps. Also if you have high mileage I believe they even have a pump for that. I have a l99 that had dod and after I installed the m295 I only had 10-15 psi on a fresh engine and then I changed it to the 10355HV pump and my pressure returned to normal. I like the 10355HV because it has extra pressure if you want it depending on what spring you use. I tried the high pressure spring and I was seeing 90+ psi and thought that was a little extreme so I put the standard pressure spring back in and now I have about 60-80 psi at wot and 35psi at idle when warm in gear with an oil cooler
The DOD engines have a second oil pressure bypass valve in the pan, separate from the pump, that caps pressure at ~55psi no matter what spring you have in the pump.
If you didn't drop the pan to do the pump the o-ring is likely not seated or got cut. Probably shouldn't have changed the pump at all.
Well I removed that darn thing and plugged it on mine.
You will need really tight bearing clearances for a M295 pump to give you good pressure.
For a higher mileage truck engine doing a DOD Delete i always use a M10295 pump with 3 #6 washers under the pressure regulator cap. And Plug off the oil pan pressure bypass deal. If bearing clearances on mains are .0025", Rods are .002", Cam bearing at .0025" and your using 5w30 it will give you 35-40psi at idle and 55-60psi at 2000rpms and 80psi at 5000rpms.
Ive had issues with the 10296 draining the truck oil pans if it is sustaining 6500+rpms.
I tried the 10295 and had higher over all pressure at wot but still had the same amount of idle pressure and that's why I was saying that he needed the HV pump.
Thanks for all the replies sorry I?ve not been able to get back thanks again goin on vacation for the next week but I will get back with you letting the forum know at least what it is
Ok so I?ve not been able to do anything yet or all this coming week but I do know that I did take the oil pan off to replace the oring and oil pump, but I didn?t block off any bypass.
From what I understand everyone basically says I need another oil pump.
I will say that I did reuse the cam retainer plate because I didn?t think it would be that big of a deal. (First real assembly of a engine)
Probably should have said this in first post but it does have 300k on the truck which is why I changed the oil pump
Now I need to figure out which oil pump to use.
Which one can I use and not have to try and block off the bypass on the oil pan and still have the high volume?
If I was you I would go to the 10296 because you need more volume at idle and that's what it will give you. I mean high much time will you spend at above 6k rpm? It's the best pump for your application.Quote:
Originally Posted by timber24053
And you don't have to really worry about plugging the bypass relief valve in the pan if you don't want to but if your going to spend a lot of time at wot then I would do it. But if this is your daily don't worry about it.