wilbur Posted August 21, 2019 Share Posted August 21, 2019 2000 460 It was rebuilt a year ago. Since the overhaul I been making oil. In 10,000 miles its up 3/8" above the mark. Before the overhaul it was fine ,I used to add between changes. This has to be from the EUP o rings.? correct.? Is there any other place you can think of for fuel to get in the oil.? I was thinking the plunger in the EUP pump but it didnt do it before. Just since the EUPs were out and put back in. Here is the latest oil sample report, not good. Thanks for your help. Where should I start. 80-190803 (2).pdf Quote Link to comment https://www.bigmacktrucks.com/topic/58719-making-oil/ Share on other sites More sharing options...
Mack Technician Posted August 21, 2019 Share Posted August 21, 2019 Fuel transfer pump seal, EUP seal or fuel gallery drilling plug. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/58719-making-oil/#findComment-430573 Share on other sites More sharing options...
wilbur Posted August 21, 2019 Author Share Posted August 21, 2019 I changed the fuel transfer pump no difference. Whatever it is its getting worse. Last October the oil sample was 1% now almost a year later its 2.5% and the truck doesnt work from Jan til March. I run to a local asphalt plant. So basically 9 months it went from 1% to 2.5%. I plan on changing the o rings on the EUP pumps this weekend. After that I have no clue.. Need help. Thanks Quote Link to comment https://www.bigmacktrucks.com/topic/58719-making-oil/#findComment-430576 Share on other sites More sharing options...
wilbur Posted August 21, 2019 Author Share Posted August 21, 2019 Just now, wilbur said: I changed the fuel transfer pump no difference. Whatever it is its getting worse. Last October the oil sample was 1% now almost a year later its 2.5% and the truck doesnt work from Jan til March. I run to a local asphalt plant. So basically 9 months it went from 1% to 2.5%. I plan on changing the o rings on the EUP pumps this weekend. After that I have no clue.. Need help. Thanks In them 9 months I only put 40,000 miles on. Quote Link to comment https://www.bigmacktrucks.com/topic/58719-making-oil/#findComment-430577 Share on other sites More sharing options...
fjh Posted August 21, 2019 Share Posted August 21, 2019 If the engine has a small plastic line to the head it can be injector o rings as well! Unlikely but a possiblity! 1 Quote Link to comment https://www.bigmacktrucks.com/topic/58719-making-oil/#findComment-430581 Share on other sites More sharing options...
Mack Technician Posted August 21, 2019 Share Posted August 21, 2019 (edited) Mack EUPs occasionally go chronic and leak no matter how You dress and install them(with standard o-rings). Mack made a special production of seals called the “Delta seal” kit. The lower ring is made of three individual parts that lay at complimentary angles. Get a 6 set and install them. I don’t believe Mack made the delta set a standard factory production install, but saw random cases where EUPs leaked and standard soft kits didn’t resolve the issue. Suspect maybe R&R of unit pumps eventually create little vertical scars on the wall of bores? Edited August 22, 2019 by Mack Technician Quote Link to comment https://www.bigmacktrucks.com/topic/58719-making-oil/#findComment-430585 Share on other sites More sharing options...
Mack Technician Posted August 21, 2019 Share Posted August 21, 2019 Delta kit is service bulletin SB221038 Quote Link to comment https://www.bigmacktrucks.com/topic/58719-making-oil/#findComment-430586 Share on other sites More sharing options...
Mack Technician Posted August 22, 2019 Share Posted August 22, 2019 (edited) Wilbur, you also posted this thread on July 28, 2018. We had the same conversation, I don’t mind recapping.......but have you done anything on it since or is this the same leak. Edited August 22, 2019 by Mack Technician 1 Quote Link to comment https://www.bigmacktrucks.com/topic/58719-making-oil/#findComment-430596 Share on other sites More sharing options...
wilbur Posted August 22, 2019 Author Share Posted August 22, 2019 Same leak getting worse last year oil sample was 1% now 2.5% diesel. Now it started the stumble or miss. was reflashed and no better, Should I just replace all unit pumps.? Is it possible for a EUP to leak fuel from the plunger or piston.? Quote Link to comment https://www.bigmacktrucks.com/topic/58719-making-oil/#findComment-430638 Share on other sites More sharing options...
JoeH Posted August 22, 2019 Share Posted August 22, 2019 23 hours ago, Mack Technician said: Mack EUPs occasionally go chronic and leak no matter how You dress and install them(with standard o-rings). Mack made a special production of seals called the “Delta seal” kit. The lower ring is made of three individual parts that lay at complimentary angles. Get a 6 set and install them. I don’t believe Mack made the delta set a standard factory production install, but saw random cases where EUPs leaked and standard soft kits didn’t resolve the issue. Suspect maybe R&R of unit pumps eventually create little vertical scars on the wall of bores? Quote Link to comment https://www.bigmacktrucks.com/topic/58719-making-oil/#findComment-430645 Share on other sites More sharing options...
JoeH Posted August 22, 2019 Share Posted August 22, 2019 23 hours ago, Mack Technician said: Delta kit is service bulletin SB221038 Read what he recommended. If it doesn't make sense read it again. He told you what he thinks you should do. 2 Quote Link to comment https://www.bigmacktrucks.com/topic/58719-making-oil/#findComment-430646 Share on other sites More sharing options...
Popular Post Mack Technician Posted August 23, 2019 Popular Post Share Posted August 23, 2019 (edited) It’s hard to say an EUP could never develop plunger leak. Look at how many years some cores could be moving in and out of chassis’s. The originals weren’t designed pre low sulfur(dry) fuel. The engineering is fascinating, you’d never think fuel film could seal so perfectly. On the flip side I’ve never seen one leaking from the stem and have been surrounded by them for 21 years. Currently, at work, we have 28 EUPs pounding fuel into cylinders daily. None of them have developed the leak your describing. Edited August 23, 2019 by Mack Technician 3 1 Quote Link to comment https://www.bigmacktrucks.com/topic/58719-making-oil/#findComment-430664 Share on other sites More sharing options...
wilbur Posted August 23, 2019 Author Share Posted August 23, 2019 They were only taken out and put back in one time. They are original 700,000 miles. I figured I would change them and get rid of the stumble at the same time. Them delta kits are pretty pricey at 100 bucks each. I cant see an o ring getting worse that s what led me to believe the plunger seal. Im also thinking a cracked head where the fuel return flows through. They are reman heads , not original. Already had trouble with one 3 days after the rebuild. Quote Link to comment https://www.bigmacktrucks.com/topic/58719-making-oil/#findComment-430692 Share on other sites More sharing options...
Mack Technician Posted August 24, 2019 Share Posted August 24, 2019 (edited) WHAT!!! $100.00??? Hosed! Give me your part number and I’ll try to find a cheaper source. Edited August 24, 2019 by Mack Technician Quote Link to comment https://www.bigmacktrucks.com/topic/58719-making-oil/#findComment-430704 Share on other sites More sharing options...
JoeH Posted August 24, 2019 Share Posted August 24, 2019 Wonder if "per set" comes with 6 sets.... Quote Link to comment https://www.bigmacktrucks.com/topic/58719-making-oil/#findComment-430719 Share on other sites More sharing options...
wilbur Posted August 24, 2019 Author Share Posted August 24, 2019 You can be right. This came from the mechanic through the parts guy, but it could be for 6. I do know the regular o rings 2 for each pump is 180 bucks for the set ,12 o rings. That sounds really high for 12 o rings. 15 bucks each, They might be Viton but dont know Quote Link to comment https://www.bigmacktrucks.com/topic/58719-making-oil/#findComment-430759 Share on other sites More sharing options...
JoeH Posted August 25, 2019 Share Posted August 25, 2019 If it fixes your problem is it worth the price? 1 Quote Link to comment https://www.bigmacktrucks.com/topic/58719-making-oil/#findComment-430771 Share on other sites More sharing options...
wilbur Posted August 25, 2019 Author Share Posted August 25, 2019 Yes it is. I found this part # on this site it should be the same. 1899-071356 cheapest I could find. https://www.agkits.com/mack-oring-kit-1899-071356.aspx?msclkid=2acf92155e6f1aec9d60cf772bf17ae7&utm_source=bing&utm_medium=cpc&utm_campaign=(ROI) Shopping&utm_term=4583657818737071&utm_content=All Products#.XWKhDuNKjIW Quote Link to comment https://www.bigmacktrucks.com/topic/58719-making-oil/#findComment-430788 Share on other sites More sharing options...
wilbur Posted August 26, 2019 Author Share Posted August 26, 2019 I ordered the pumps today from the Diesel Store and got mack to sell me the delta kits at 65.00 each. I will do this over the weekend and should know if it fixed it by the next weekend. Quote Link to comment https://www.bigmacktrucks.com/topic/58719-making-oil/#findComment-430882 Share on other sites More sharing options...
Mack Technician Posted August 26, 2019 Share Posted August 26, 2019 K&S sells Bosch reman @ $300. Quote Link to comment https://www.bigmacktrucks.com/topic/58719-making-oil/#findComment-430899 Share on other sites More sharing options...
wilbur Posted August 27, 2019 Author Share Posted August 27, 2019 These were Bosch remans rebuilt by bosch for 265 Quote Link to comment https://www.bigmacktrucks.com/topic/58719-making-oil/#findComment-430964 Share on other sites More sharing options...
Mack Technician Posted August 29, 2019 Share Posted August 29, 2019 Good price! I'm throwing the SB on for posterity.... Delta EUP O-ring.pdf Quote Link to comment https://www.bigmacktrucks.com/topic/58719-making-oil/#findComment-431067 Share on other sites More sharing options...
wilbur Posted August 29, 2019 Author Share Posted August 29, 2019 I also have them the delta seals Mack sold me for 65 each. Quote Link to comment https://www.bigmacktrucks.com/topic/58719-making-oil/#findComment-431083 Share on other sites More sharing options...
wilbur Posted September 3, 2019 Author Share Posted September 3, 2019 Put all EUPs in this weekend with the Delta seals. When #5 EUP came out it was in pieces. The clip that holds the plunger was off so was the spring retainer. Wonder if thats where my fuel was coming from.? Quote Link to comment https://www.bigmacktrucks.com/topic/58719-making-oil/#findComment-431390 Share on other sites More sharing options...
fjh Posted September 3, 2019 Share Posted September 3, 2019 (edited) Did the pump pop up when u unbolted it ? This will cause em to fly apart! Also I hope you are replacing the eup bolts they tend to break when reused ! Edited September 3, 2019 by fjh Quote Link to comment https://www.bigmacktrucks.com/topic/58719-making-oil/#findComment-431391 Share on other sites More sharing options...
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