'05 LLY with 130,000 miles....

This past sunday getting off of exit, come to complete stop and start to accelerate. The moment the truck started to move ding...ding low oil pressure warning. Roll into a church parking lot and have truck towed to shop. List of process to find problem:

1) install new sending unit....no oil pressure
2) install mechanical gauge....no oil pressure
3) remove all stuff covering the pump and low and behold the nut holding gear on the pump itself was loose. Upon further inspection pump does turn-over but has a stiff spot. so the pump is coming out of the truck....

As bad as it sounds we believe there is no damage to the engine. Just looking for insight into others that may or may not of had this problem.

Truck has had the following done:
#2 & #7 injector harness repair
Alternator bracket rub was found just before it became a problem
new water pump
new front bearings (both sides)
new steering shaft
new line from power steering to booster

I simply am loosing all faith.... and as much as I want a new truck I am not interested in the wonderful world of DPF:mad:

I will give ya guys an update as I get more info

Joe

Sounds like the low oil pressure warning and the fact that you didn't ignore it saved your motor from any serious damage. The other problems you've had are easily repaired and very normal for these trucks. After 130,000 miles, I wouldn't complain. Ford, Dodge, whatever, they all have there problems. I rode in a new Dodge and it made me car sick, Rides like $hit.

Update:

pump failed at the best time possible: low RPM's and close to help.

Bottom end looks remarkably clean and not so much as a hint of metal in oil pan

One question for those in the know:
When testing for oil pressure we heard the Turbo vanes (exhaust side) slightly rub the bottom of the Turbo housing. Are the bearings pressurized and when the pressure is restored will they center the turbo? I visualy inspected and only saw a skim of the soot on the bottom of the turbo.

Thanks for the help...
Joe

What failed on the pump?

I have not inspected it myself yet... Basically it appears to be a gear pump and the secondary gear has an exposed hole for an allen wrench. When you turn the pump over it is free for half the revolution and then is tight on the other side. I believe the tight spot caused the retaining nut to come loose on deceleration. We just got into it deep enough on friday to confirm oil pump. Monday we will disassemble and post some pics.

To be on the safe side, if anyone has a LLY Turbo (they want to part ways with) I am wanting to buy before end of day tuesday. I will be heading to a national race for a week and plan to put the engine back in truck on August 11. I feel there is to much end play in mine and it would be an easy install with the engine out!!!

Thx for any info and will try to post pics on mon or tues
Joe

I was curious if the drive gear had spun on the shaft or not.

same thing happend to my buddy's LB7 at 190k miles. Nut came loose. Luckilly the pump was still fine so he was able to pull the front cover, tighten the nut, and be up and running again in a few hours.

from what I understand though, failures of the oil pumps themselves are very rare. Not much to go wrong.

ben

OK, how about if you have low oil pressure at idle, but above 1200 rpm it builds, but no more than 35 (on the guage).

BTW, it's fine when cold, loses it when hot, and the oil has less than 50 miles on it.

OK, how about if you have low oil pressure at idle, but above 1200 rpm it builds, but no more than 35 (on the guage).

BTW, it's fine when cold, loses it when hot, and the oil has less than 50 miles on it.


your oil pump is fine, the low oil pressure is typical. If your oil pump was bad, you would have zero pressure, and it would be dinging at you and say "LOW OIL PRESSURE" in the driver info center.

spec is 14psi at hot idle, 42psi hot at 1800rpm.

ben

I guess I should explain myself better. I do get the low oil pressure message and dinging, and the guage is in the red. If I rev it over 1200, it will build to about 25.
Thanks, John

I guess I should explain myself better. I do get the low oil pressure message and dinging, and the guage is in the red. If I rev it over 1200, it will build to about 25.
Thanks, John

I would put a mechanical gauge on it to double check. Also have an oil analysis done maybe to see if the bearings are starting to fall apart...

How long has it had this condition for?

ben

Just started. Thats why I changed the oil. I used Rotella T 15/40 and a Purolator filter. The last time this happened to me, was about 5 mos after I bought it. i added some oil, and it helped a little. I brought it in for an oil change the next morn., and that cured it. So when it did it again, and the oil life indicator was low, I figured, no big deal, change the oil. So I did, and the oil pressure came up to norm. The truck sat for a wk, and when I went to use it today, it started doing it when the oil warmed up.

What truck do you have?

Sounds like fuel in oil if it is LB7 and you have posted in the wrong place.

It's an '04 3500 dually, and someone put a 6 gun tuner in it for eng LLY. Also, I thought all the bigger trucks got the LLY??

It's an '04 3500 dually, and someone put a 6 gun tuner in it for eng LLY. Also, I thought all the bigger trucks got the LLY??

All of the 2004.5 to 2005 trucks got the LLY.

2001-early 2004 trucks had the LB7.

ben

Check the 8th digit of the VIN, if it is a 1, it is LB7. If 2, it is a LLy

Let us know.

8th digit is a 2

Also I am looking for an LLY stock turbo...Too much play and so easy to replace with engine out!!!

Found the problem!!!!! A bad ground on the sender appears to be the culprit. Thanks for your assistance.