Underdog Posted December 17, 2011 Share Posted December 17, 2011 I wonder can oil pressure be too high? On my newly aquired E9, pressure reads about 90 psi at road speed, and settles down to around 35 psi at hot idle. What is normal for these V8's and what could cause oil pressure to go abnormally high?Gregg Quote Link to comment https://www.bigmacktrucks.com/topic/22171-oil-pressure-too-high/ Share on other sites More sharing options...
Firemack Posted December 17, 2011 Share Posted December 17, 2011 My Mack MH has a Mack rebuilt E6, it has 90 Lbs oil pressure at 2200 rpm, 30 lbs at idle.I can check the book later today , but sounds about right.Firemack Quote Link to comment https://www.bigmacktrucks.com/topic/22171-oil-pressure-too-high/#findComment-94446 Share on other sites More sharing options...
MACKS Posted December 17, 2011 Share Posted December 17, 2011 I never had a V-8 so can't comment on that engine but I once had 237 Mack engine with those same numbers as far as oil pressure and was told by a few knowledgeable people that there was some kind of adjustment or relief valve on the oil pump or maybe it was on the engine it's self, but was told to leave it be,never had a problem and the engine always ran great.. Quote Link to comment https://www.bigmacktrucks.com/topic/22171-oil-pressure-too-high/#findComment-94449 Share on other sites More sharing options...
mackcl96 Posted December 18, 2011 Share Posted December 18, 2011 Morning Gregg Your fine on oil psi.....You have been in that E-Tech to long with 19 psi idle to remember.If I remember 25 psi min hot idle and 90 to 100 full rpm according to Mack . Quote Thanks for hearing me out.You can have the soap box now---------JIM Link to comment https://www.bigmacktrucks.com/topic/22171-oil-pressure-too-high/#findComment-94553 Share on other sites More sharing options...
ducky698 Posted December 19, 2011 Share Posted December 19, 2011 Hi, the oil pressure is up there on the V8s. I just killed an 866 cause oil pressure was 10 at idle and up around the 30s on the move. not any where near where it should be. as mackcl96 said is about what it should be. the only thing that adjust oil pressure down stairs is an spring a bit over 4inchs long, its obviously working fine, mine came out in a million bits.I would do an oil change on it tho and then you as the new owner 100% know what oil is in it.goodluck with it, hopefully you dont have the same issues I have.Grant Quote Link to comment https://www.bigmacktrucks.com/topic/22171-oil-pressure-too-high/#findComment-94604 Share on other sites More sharing options...
mowerman Posted December 19, 2011 Share Posted December 19, 2011 ya,,, i had a 350 thermo, that had 90 lbs,,,know what you mean,,its kinda shocking at first.bob Quote Link to comment https://www.bigmacktrucks.com/topic/22171-oil-pressure-too-high/#findComment-94606 Share on other sites More sharing options...
Underdog Posted December 19, 2011 Author Share Posted December 19, 2011 I appreciate all the feedback everyone. I just got this truck two weeks ago and putting it right to work. I changed oil & filters and fixed a few oil leaks on the engine but it seems OK otherwise. I don't have any maintenance history on this truck and I just want to make sure I am starting out in good order. I can't wait to hook a load behind... This beast seems like it wants to PULL. Jim I think you are right I've been in that E-Tech too long I forgot what power feels like !Gregg Quote Link to comment https://www.bigmacktrucks.com/topic/22171-oil-pressure-too-high/#findComment-94610 Share on other sites More sharing options...
BAD DOG Posted December 20, 2011 Share Posted December 20, 2011 I don't see why 90 psi would hurt anything my E9s run 80psi going down the road under load and 35to 40psi at an idle. Quote Link to comment https://www.bigmacktrucks.com/topic/22171-oil-pressure-too-high/#findComment-94726 Share on other sites More sharing options...
barbe Posted December 20, 2011 Share Posted December 20, 2011 i have a old endt 673 with that kind of oil pressure and has had for 20+ years no probs due to it Quote Link to comment https://www.bigmacktrucks.com/topic/22171-oil-pressure-too-high/#findComment-94778 Share on other sites More sharing options...
mowerman Posted December 20, 2011 Share Posted December 20, 2011 I appreciate all the feedback everyone. I just got this truck two weeks ago and putting it right to work. I changed oil & filters and fixed a few oil leaks on the engine but it seems OK otherwise. I don't have any maintenance history on this truck and I just want to make sure I am starting out in good order. I can't wait to hook a load behind... This beast seems like it wants to PULL. Jim I think you are right I've been in that E-Tech too long I forgot what power feels like !Gregghows that cabover engine coming along??? bob Quote Link to comment https://www.bigmacktrucks.com/topic/22171-oil-pressure-too-high/#findComment-94783 Share on other sites More sharing options...
Harry John Posted December 21, 2011 Share Posted December 21, 2011 Usually that means too much oil in the system, or that the coolant level is too low. Quote Link to comment https://www.bigmacktrucks.com/topic/22171-oil-pressure-too-high/#findComment-94898 Share on other sites More sharing options...
shortstack Posted December 21, 2011 Share Posted December 21, 2011 Huh? Quote Link to comment https://www.bigmacktrucks.com/topic/22171-oil-pressure-too-high/#findComment-94905 Share on other sites More sharing options...
Rob Posted December 21, 2011 Share Posted December 21, 2011 Usually that means too much oil in the system, or that the coolant level is too low. Thinking this poster is a spammer but no proof yet.I'm on it.Rob Quote Plodding along with no job nor practical application for my existence, but still trying to fix what's broke. Link to comment https://www.bigmacktrucks.com/topic/22171-oil-pressure-too-high/#findComment-94907 Share on other sites More sharing options...
shortstack Posted December 22, 2011 Share Posted December 22, 2011 Thanks Rob! Trey Quote Link to comment https://www.bigmacktrucks.com/topic/22171-oil-pressure-too-high/#findComment-95029 Share on other sites More sharing options...
Underdog Posted December 23, 2011 Author Share Posted December 23, 2011 hows that cabover engine coming along??? bobThanks for asking, Bob. I am basically going from the ground up with another block, crank, & heads. Updating to the larger bearings and 20-bolt heads. All this in my spare time between getting the Superliner ready to go and recovering the Vision.Gregg Quote Link to comment https://www.bigmacktrucks.com/topic/22171-oil-pressure-too-high/#findComment-95087 Share on other sites More sharing options...
Superdog Posted January 21, 2012 Share Posted January 21, 2012 How R U getting along with the Superliner??? Quote Link to comment https://www.bigmacktrucks.com/topic/22171-oil-pressure-too-high/#findComment-98958 Share on other sites More sharing options...
other dog Posted January 21, 2012 Share Posted January 21, 2012 Huh?makes perfect sense to me- if your oil pressure is too high, just add some antifreeze, whether it needs it or not. Quote Producer of poorly photo-chopped pictures since 1999. Link to comment https://www.bigmacktrucks.com/topic/22171-oil-pressure-too-high/#findComment-98962 Share on other sites More sharing options...
HK Trucking Posted January 21, 2012 Share Posted January 21, 2012 makes perfect sense to me- if your oil pressure is too high, just add some antifreeze, whether it needs it or not......and they better drain the excess oil out of the transmission too!!!!! lol. Hahahahaha!!!!!!!!!!!!! Quote "If You Can't Shift It Smoothly, You Shouldn't Be Driving It" Link to comment https://www.bigmacktrucks.com/topic/22171-oil-pressure-too-high/#findComment-98996 Share on other sites More sharing options...
RowdyRebel Posted January 21, 2012 Share Posted January 21, 2012 I was at the yard last night BSing with the mechanics & other drivers....company truck pulled in over the pit last night at the shop. I knew the driver, so I told the mechanic he wanted the oil drained to lighten up his tare weight.... Quote When approaching a 4-way stop, the vehicle with the biggest tires has the right of way! Link to comment https://www.bigmacktrucks.com/topic/22171-oil-pressure-too-high/#findComment-99000 Share on other sites More sharing options...
Underdog Posted January 22, 2012 Author Share Posted January 22, 2012 How R U getting along with the Superliner???Thanks for asking. I have not been too active on the forums since the Superliner is keeping me quite occupied. Nothing serious, just lots to do on a 28 year old truck, and trying to work it at the same time. But we do go out make some money and come back home every week so I would say we are getting along just fine. Quite comfortable to drive despite the lack of air ride. The biggest adjustment has been the small bunk and limited storage space. Lots of thumbs up everywhere I go makes me proud to finally own & drive a Superliner.Gregg Quote Link to comment https://www.bigmacktrucks.com/topic/22171-oil-pressure-too-high/#findComment-99144 Share on other sites More sharing options...
mackcl96 Posted January 22, 2012 Share Posted January 22, 2012 Thanks for asking. I have not been too active on the forums since the Superliner is keeping me quite occupied. Nothing serious, just lots to do on a 28 year old truck, and trying to work it at the same time. But we do go out make some money and come back home every week so I would say we are getting along just fine. Quite comfortable to drive despite the lack of air ride. The biggest adjustment has been the small bunk and limited storage space. Lots of thumbs up everywhere I go makes me proud to finally own & drive a Superliner.GreggI was worried a little ,,,,,,,you been quiet since you got itWas hoping it wasn't giving you big headaches Quote Thanks for hearing me out.You can have the soap box now---------JIM Link to comment https://www.bigmacktrucks.com/topic/22171-oil-pressure-too-high/#findComment-99150 Share on other sites More sharing options...
Underdog Posted January 23, 2012 Author Share Posted January 23, 2012 I was worried a little ,,,,,,,you been quiet since you got itWas hoping it wasn't giving you big headachesJust lots of little things...I have been taking advantage of our fair weather, out in the driveway dawn to dusk most days when I am home. I don't think this truck has been run much lately. And I do have to question what type of repair & maintenance has been done over the years. Sometimes I think neglect would be a better option than some of the half-assed s#!@ repairs I have come across. Oh well, basically a solid truck, I don't regret the purchase, and she's in better hands now up & running most days.Gregg Quote Link to comment https://www.bigmacktrucks.com/topic/22171-oil-pressure-too-high/#findComment-99268 Share on other sites More sharing options...
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