barrym Posted February 21, 2010 Share Posted February 21, 2010 my E7 blowing the oil fill cap off the fill tube and pushing oil outof the fill tubeis there a breather that could be pluged ? Quote Link to comment https://www.bigmacktrucks.com/topic/12731-high-crankcase-pressure/ Share on other sites More sharing options...
fjh Posted February 21, 2010 Share Posted February 21, 2010 my E7 blowing the oil fill cap off the fill tube and pushing oil outof the fill tubeis there a breather that could be pluged ?Yup The front rh of the engine there is a little pot hanging out with the blow by tube on it!take the lid off and check it!If its not gooed up post back there are other reasons! 1 Quote Link to comment https://www.bigmacktrucks.com/topic/12731-high-crankcase-pressure/#findComment-50032 Share on other sites More sharing options...
redman Posted February 23, 2010 Share Posted February 23, 2010 i have the same problem. 97 427,dont have the pot and breather on rh front.i do have a blowby tube from the valve cover,that smokes just fine. Quote Link to comment https://www.bigmacktrucks.com/topic/12731-high-crankcase-pressure/#findComment-50145 Share on other sites More sharing options...
fjh Posted February 24, 2010 Share Posted February 24, 2010 i have the same problem. 97 427,dont have the pot and breather on rh front.i do have a blowby tube from the valve cover,that smokes just fine.Have you tested your oil for coolant?This Problem (Can sometimes) be produced from the turbo!Does your truck puff out there At idle? Quote Link to comment https://www.bigmacktrucks.com/topic/12731-high-crankcase-pressure/#findComment-50149 Share on other sites More sharing options...
bbigrig Posted February 26, 2010 Share Posted February 26, 2010 If you have the breather on the front right side its and E-tech engine. If the breather tube comes from the valve cover its a good old E-7.The E-7 was in the start of '97 and E- tech near the end of '97.Depending on which motor you have, you can have different problems. Which motor is it?Have you tried putting a new plug in the filler tube? ( don't take that the wrong way) It's happened to me, and while driving it blew some oil out.Is the oil level normal? (E-tech problem) Quote Link to comment https://www.bigmacktrucks.com/topic/12731-high-crankcase-pressure/#findComment-50263 Share on other sites More sharing options...
Bob123 Posted February 9, 2020 Share Posted February 9, 2020 Having this same problem. Did you ever find out what was going on? Quote Link to comment https://www.bigmacktrucks.com/topic/12731-high-crankcase-pressure/#findComment-442272 Share on other sites More sharing options...
steeler Posted February 15, 2020 Share Posted February 15, 2020 On 2/8/2020 at 10:35 PM, Bob123 said: Having this same problem. Did you ever find out what was going on? Another thing to check is the air compressor. I've seen 3 of these with a hole in one of the air compressor pistons. Everything appears great till you put load on the engine and your boost pressure dumps thru the hole right into the crank case. Easy way to tell us to blow shop air into the compressor intake, with the oil fill cap removed and feel for air blowing out. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/12731-high-crankcase-pressure/#findComment-442831 Share on other sites More sharing options...
Mack Technician Posted February 15, 2020 Share Posted February 15, 2020 6 hours ago, steeler said: Another thing to check is the air compressor. I've seen 3 of these with a hole in one of the air compressor pistons. Everything appears great till you put load on the engine and your boost pressure dumps thru the hole right into the crank case. Easy way to tell us to blow shop air into the compressor intake, with the oil fill cap removed and feel for air blowing out. On Gray engines or Red engines? That’s weird. Cracked or hole? Quote Link to comment https://www.bigmacktrucks.com/topic/12731-high-crankcase-pressure/#findComment-442839 Share on other sites More sharing options...
steeler Posted February 15, 2020 Share Posted February 15, 2020 Gray engines with Bendix compressor. All 3 I've seen have had a hole from where they had ingested something. The first one got me good, I had tried everything to fix it, was a high mileage engine so I inframed it before I found the issue lol. That was a little tricky trying to explain to the customer why he needed a new compressor. Edit...I should add that the hole I found in the piston was on the first one. I didn't bother with pulling the compressor head on the other 2 because I knew what was going on after my first experience 1 1 Quote Link to comment https://www.bigmacktrucks.com/topic/12731-high-crankcase-pressure/#findComment-442841 Share on other sites More sharing options...
fjh Posted February 15, 2020 Share Posted February 15, 2020 Bit of an Eye opener for me Never see that Happen! 1 Quote Link to comment https://www.bigmacktrucks.com/topic/12731-high-crankcase-pressure/#findComment-442844 Share on other sites More sharing options...
steeler Posted February 15, 2020 Share Posted February 15, 2020 2 hours ago, fjh said: Bit of an Eye opener for me Never see that Happen! And I felt stupid after the first one. I've seen 3, 2 of them were Le's and the other a CV. I work at a rather small shop too. Maybe I should buy a lottery ticket! Quote Link to comment https://www.bigmacktrucks.com/topic/12731-high-crankcase-pressure/#findComment-442855 Share on other sites More sharing options...
Popular Post Mack Technician Posted February 15, 2020 Popular Post Share Posted February 15, 2020 9 hours ago, fjh said: Bit of an Eye opener for me Never see that Happen! Same here. Steeler, your have a real humility that let’s you expose even your worst slip up. That’s huge. I’m still working on it. Someday I’ll tell you what happens if you forget to remove a camshaft installation shoe, but I’m currently still in denial. 1 2 Quote Link to comment https://www.bigmacktrucks.com/topic/12731-high-crankcase-pressure/#findComment-442887 Share on other sites More sharing options...
steeler Posted February 16, 2020 Share Posted February 16, 2020 1 hour ago, Mack Technician said: Same here. Steeler, your have a real humility that let’s you expose even your worst slip up. That’s huge. I’m still working on it. Someday I’ll tell you what happens if you forget to remove a camshaft installation shoe, but I’m currently still in denial. Lol!! Hey I'm confident enough in my abilities that I can admit when I screw up. It happens to all of us. I try not to let it happen often, but occasionally it will. The trick is getting the best outcome and not costing the company too much money lol. I have a pretty good idea in my head of what that cam tool looked like afterwards! 1 1 Quote Link to comment https://www.bigmacktrucks.com/topic/12731-high-crankcase-pressure/#findComment-442895 Share on other sites More sharing options...
fjh Posted February 16, 2020 Share Posted February 16, 2020 (edited) Oh ya seen it happen looked good on that guy too he was one of those that could do no wrong in his own mind! He found the issue next oil change thou! 😂 Edited February 16, 2020 by fjh Quote Link to comment https://www.bigmacktrucks.com/topic/12731-high-crankcase-pressure/#findComment-442914 Share on other sites More sharing options...
theakerstwo Posted February 18, 2020 Share Posted February 18, 2020 Yes i have hear of those people that dont make mistakes but never have been able to run into some of them.But i be still watching for one. Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/12731-high-crankcase-pressure/#findComment-443104 Share on other sites More sharing options...
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