wilbur Posted July 28, 2018 Share Posted July 28, 2018 If all the O Rings were missing as in put in without them, how much do you think the oil will rise on the dipstick in say 1000 miles. I overhauled the engine and was not there the day my helper put the pumps in. They were all there in a box cleaned up minus O Rings. He said he installed them. After 1000 miles I picked up 1/16" of oil on the dipstick. I figure with the square inches of the oil pan a 1/16 has to be at least a quart. OPINIONS PLEASE Thanks Oh E7 460 2000 yr. Quote Link to comment https://www.bigmacktrucks.com/topic/53931-eu-pump/ Share on other sites More sharing options...
turckster Posted July 29, 2018 Share Posted July 29, 2018 If he installed all EUP's without o-rings the engine would not start and would be full of fuel in no time. Plus, fuel would be running all over the right side of the block. I don't think I would be worrying about a 1/16" of an inch since so many things could affect oil level. Now 1/4" + in 1,000 miles--- maybe then I'd worry. Quote Link to comment https://www.bigmacktrucks.com/topic/53931-eu-pump/#findComment-403249 Share on other sites More sharing options...
Mack Technician Posted July 29, 2018 Share Posted July 29, 2018 Do an oil sample and test fuel content. If you have fuel, viscosity drop, pull EUPs and install the special application triangle cut ring. Mack had some seepage issues so they made a seal kit to help remedy light leaks at EUP bores. Quote Link to comment https://www.bigmacktrucks.com/topic/53931-eu-pump/#findComment-403263 Share on other sites More sharing options...
theakerstwo Posted July 29, 2018 Share Posted July 29, 2018 If it was me I would start with asking your helper if he install the o/rings. 1 Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/53931-eu-pump/#findComment-403264 Share on other sites More sharing options...
Mack Technician Posted July 29, 2018 Share Posted July 29, 2018 I don’t think he can have no rings installed. My wild guess is 4-5 minutes, full RPM, without any o-rings, would fill the crankcase to fill tube inlet, if engine would even run with that amount of pressure drop. Quote Link to comment https://www.bigmacktrucks.com/topic/53931-eu-pump/#findComment-403266 Share on other sites More sharing options...
fjh Posted July 29, 2018 Share Posted July 29, 2018 34 minutes ago, Mack Technician said: I don’t think he can have no rings installed. My wild guess is 4-5 minutes, full RPM, without any o-rings, would fill the crankcase to fill tube inlet, if engine would even run with that amount of pressure drop. Mack Tech is correct in my opinion ! how ever It is possible he could have nicked an oring but with even one missing I believe the engine would be fuel of fuel in short order if it would run at all . This also may be unrelated to the oring job ,the fuel transfer pump seals can leak past the shaft ( its not uncommon !) Quote Link to comment https://www.bigmacktrucks.com/topic/53931-eu-pump/#findComment-403272 Share on other sites More sharing options...
wilbur Posted July 29, 2018 Author Share Posted July 29, 2018 Thanks Guys Im due for an oil change soon. I will check more after that. Thanks again im relieved. Quote Link to comment https://www.bigmacktrucks.com/topic/53931-eu-pump/#findComment-403290 Share on other sites More sharing options...
Ezrider Posted August 10, 2018 Share Posted August 10, 2018 i agree that i don't think it would even run with the o rings missing. i would mark a place on the ground to check the oil. drive it a while and park it in the EXACT spot. wait the same amount of time after shutting off the engine to check as well. but very slight grade differences can move the level on the dipstick 1/16th of a inch very easily. i used to drive myself nuts with that kind of stuff when i first bought my first truck. pull a oil sample and send it in for analysis. that will tell you conclusively if there is any fuel contamination. cat sos or Blackstone labs. Quote Link to comment https://www.bigmacktrucks.com/topic/53931-eu-pump/#findComment-403887 Share on other sites More sharing options...
wilbur Posted August 12, 2018 Author Share Posted August 12, 2018 Sent one out on Mon. Thanks Maybe on a fresh rebuild some fuel is getting past the rings.? Quote Link to comment https://www.bigmacktrucks.com/topic/53931-eu-pump/#findComment-404010 Share on other sites More sharing options...
wilbur Posted August 16, 2018 Author Share Posted August 16, 2018 I got analysis back it was less than 0.50 % on fuel. So i guess i was worried about nothing. Quote Link to comment https://www.bigmacktrucks.com/topic/53931-eu-pump/#findComment-404242 Share on other sites More sharing options...
wilbur Posted August 16, 2018 Author Share Posted August 16, 2018 18489531.pdf 1 Quote Link to comment https://www.bigmacktrucks.com/topic/53931-eu-pump/#findComment-404243 Share on other sites More sharing options...
wilbur Posted September 16, 2018 Author Share Posted September 16, 2018 I changed the oil and ran it. Checked the next day, it was right at mark on dipstick. 6 weeks later its 5/16" above mark. Seems to be gaining 1/16 a week, which is about 1200 miles. Any ideas.? Maybe getting past the rings.? Has about 10,000 on overhaul. Thanks for any help. Quote Link to comment https://www.bigmacktrucks.com/topic/53931-eu-pump/#findComment-406108 Share on other sites More sharing options...
Mack Technician Posted September 18, 2018 Share Posted September 18, 2018 Put in the delta seal kits on EUP Quote Link to comment https://www.bigmacktrucks.com/topic/53931-eu-pump/#findComment-406230 Share on other sites More sharing options...
wilbur Posted September 22, 2018 Author Share Posted September 22, 2018 Would you happen to have a part# Quote Link to comment https://www.bigmacktrucks.com/topic/53931-eu-pump/#findComment-406496 Share on other sites More sharing options...
Mack Technician Posted September 22, 2018 Share Posted September 22, 2018 Google search “Mack SB-221-038”. It will give the full description with procedure and part numbers. Quote Link to comment https://www.bigmacktrucks.com/topic/53931-eu-pump/#findComment-406505 Share on other sites More sharing options...
wilbur Posted September 23, 2018 Author Share Posted September 23, 2018 Thanks. I replaced the the transfer pump yesterday and checked it with air pressure and seal wasnt leaking. I guess the eup seals is all thats left. Thanks Quote Link to comment https://www.bigmacktrucks.com/topic/53931-eu-pump/#findComment-406544 Share on other sites More sharing options...
Mack Technician Posted September 23, 2018 Share Posted September 23, 2018 Three spots... 1. EUP rings 2.fuel pump 3.fuel gallery plug Your block is drilled end-to-end to create the two fuel galleries for you EUPs. If you look at the front of the block you will see one drilling plug, the other lower plug is under the timing cover. If it leaked you would take on fuel internally. Not a popular leak though. Always a little fascinated the stems on an EUP hold fuel back. If you ever dump an EUP pull the spring off and pump stem out of your core. No seals. The fuel plunger has thousands of psi of fuel on one side and crankcas on the other side. Metal sealing through fuel film only. I don’t view them as able to stop 100% fuel x-over, but generally they do. Quote Link to comment https://www.bigmacktrucks.com/topic/53931-eu-pump/#findComment-406547 Share on other sites More sharing options...
Mack Technician Posted September 25, 2018 Share Posted September 25, 2018 (edited) Just happened to lose an EUP in one of the 934D engines yesterday...….. The Gold surface is your seal between the fuel column being injected and your crankcase. I don't see it as a 100% efficient seal and would allow a minimal acceptable fuel x-over with age and wear. Edited September 25, 2018 by Mack Technician Quote Link to comment https://www.bigmacktrucks.com/topic/53931-eu-pump/#findComment-406641 Share on other sites More sharing options...
wilbur Posted October 14, 2018 Author Share Posted October 14, 2018 Is there a fix for this, other than replacing the eup.? Quote Link to comment https://www.bigmacktrucks.com/topic/53931-eu-pump/#findComment-407869 Share on other sites More sharing options...
Mack Technician Posted October 14, 2018 Share Posted October 14, 2018 Did you go through the service bulletin I made reference to? Mack doesn’t suggest changing EUPs for the issue. Quote Link to comment https://www.bigmacktrucks.com/topic/53931-eu-pump/#findComment-407880 Share on other sites More sharing options...
wilbur Posted October 14, 2018 Author Share Posted October 14, 2018 no i didnt. could you post it again.? Thanks Quote Link to comment https://www.bigmacktrucks.com/topic/53931-eu-pump/#findComment-407900 Share on other sites More sharing options...
Mack Technician Posted October 15, 2018 Share Posted October 15, 2018 It’s in this post, scroll up.... Quote Link to comment https://www.bigmacktrucks.com/topic/53931-eu-pump/#findComment-407914 Share on other sites More sharing options...
wilbur Posted October 15, 2018 Author Share Posted October 15, 2018 you mean SB-221-038.? I thought that was about the Delta seal kit.? I read it again and it said nothing about not changing EUPS. It was just about the DELTA seals and installation I was referring to your post about the shaft being worn on the EUP.? Is there a fix for that.? Quote Link to comment https://www.bigmacktrucks.com/topic/53931-eu-pump/#findComment-407963 Share on other sites More sharing options...
Mack Technician Posted October 16, 2018 Share Posted October 16, 2018 No fix, I've never seen an EUP changed for contaminating the volume of oil via plunger leakage as illustrated. It's not a perfect seal, but sufficient. I think a trace amount could potentially come from a steel-steel seal like the injection plunger uses. 0.05% as you listed...…?……...maybe, but that does not qualify a contaminated engine? Quote Link to comment https://www.bigmacktrucks.com/topic/53931-eu-pump/#findComment-407993 Share on other sites More sharing options...
wilbur Posted October 16, 2018 Author Share Posted October 16, 2018 OK Thanks. I just sent a sample to Blackstone yesterday. Hopefully it will be ok. Dont know why its gaining oil.? A fresh rebuild should be using some. Quote Link to comment https://www.bigmacktrucks.com/topic/53931-eu-pump/#findComment-408015 Share on other sites More sharing options...
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