Mack log truck Posted February 24, 2022 Share Posted February 24, 2022 Curious what your guy thoughts are on this amount of blowby. 1995 cl713 e7 427. It's a log truck so gets quite of loader time running around 1900rpm. Currently shows 21,100hrs. Has around 60psi oil pressure at startup idle, slightly under 20psi oil pressure at 170-180deg idle. Little bit of oil hase coming out of the tube. Thanks in advance 20220224_114918.mp4 Quote Link to comment https://www.bigmacktrucks.com/topic/69286-1995-e7-427-blowby/ Share on other sites More sharing options...
Joey Mack Posted February 24, 2022 Share Posted February 24, 2022 I think its bit too much blowby, and the low oil pressure when warmed up. 20+ would make me feel better.. when was the last time the oil pump was re[laced, as well as rod and main bearings? the blowby is usually worn rings, I have done rods and mains and an oil pump several times to help improve oil pressure.. Of course I didnt do cam bushings, due to cust. budget or request... it does help. I also check the welch plugs in the rocker arm shafts to make sure one is not leaking by or popped out.. ive made that repair a few times... there will be more comments on the way.. one of us will help you... jojo Quote Link to comment https://www.bigmacktrucks.com/topic/69286-1995-e7-427-blowby/#findComment-490208 Share on other sites More sharing options...
Mack log truck Posted February 25, 2022 Author Share Posted February 25, 2022 2 hours ago, Joey Mack said: I think its bit too much blowby, and the low oil pressure when warmed up. 20+ would make me feel better.. when was the last time the oil pump was re[laced, as well as rod and main bearings? the blowby is usually worn rings, I have done rods and mains and an oil pump several times to help improve oil pressure.. Of course I didnt do cam bushings, due to cust. budget or request... it does help. I also check the welch plugs in the rocker arm shafts to make sure one is not leaking by or popped out.. ive made that repair a few times... there will be more comments on the way.. one of us will help you... jojo I have not touched the engine and i dont know the history. I bought it 6 years ago when it had 19,000hrs and have put about 2,000hrs and about 10,000 miles on it. It starts good, has a little blueish smoke when it's cold but doesn't blow smoke under load as far as I can tell while operating. If there is "upkeep engine maintenance" I can do or have a mechanic look into that aren't huge expences I'd like to pursue them. Quote Link to comment https://www.bigmacktrucks.com/topic/69286-1995-e7-427-blowby/#findComment-490222 Share on other sites More sharing options...
Popular Post Joey Mack Posted February 25, 2022 Popular Post Share Posted February 25, 2022 If it runs good and get's the job done.. run it... keep up on the fluids and temperature.. belts and so on, and it will run and run... jojo 1 2 Quote Link to comment https://www.bigmacktrucks.com/topic/69286-1995-e7-427-blowby/#findComment-490227 Share on other sites More sharing options...
Popular Post R.E.D Posted February 25, 2022 Popular Post Share Posted February 25, 2022 16 minutes ago, Joey Mack said: If it runs good and get's the job done.. run it... keep up on the fluids and temperature.. belts and so on, and it will run and run... jojo I second that... I think low threshold oil psi for that year is 15psi....so your good there . besides for the amount of run time you've given it in 6 years , that amount of blowby is no concern...but if you do plan to run it constant, wouldn't hurt to get a manometer test done to see how bad your engine wear is..clear hose with a u shape and some water in it connected to a crankcase pressure source with a pressure relief.. there's a good video on YouTube about this...I'll try to find it. 1 2 Quote Link to comment https://www.bigmacktrucks.com/topic/69286-1995-e7-427-blowby/#findComment-490231 Share on other sites More sharing options...
R.E.D Posted February 25, 2022 Share Posted February 25, 2022 it's on an isx...but same principle applies. Quote Link to comment https://www.bigmacktrucks.com/topic/69286-1995-e7-427-blowby/#findComment-490232 Share on other sites More sharing options...
mechohaulic Posted February 25, 2022 Share Posted February 25, 2022 what type of maintance are you doing to it in terms of oil change intervals? blow -by not an issue . possibly shorten the oil change interval up grade oil type with hopes of raising oil pressure. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/69286-1995-e7-427-blowby/#findComment-490236 Share on other sites More sharing options...
Mack log truck Posted February 25, 2022 Author Share Posted February 25, 2022 1 minute ago, mechohaulic said: what type of maintance are you doing to it in terms of oil change intervals? blow -by not an issue . possibly shorten the oil change interval up grade oil type with hopes of raising oil pressure. I do oil changes on my diesel engines every 250hrs. I shoot for 200-250hrs but usually ends up nearer to 250. Quote Link to comment https://www.bigmacktrucks.com/topic/69286-1995-e7-427-blowby/#findComment-490237 Share on other sites More sharing options...
Joey Mack Posted February 25, 2022 Share Posted February 25, 2022 i would think you are a severe service application. wouldnt 150 hrs be correct? I need to look in my maint. and lube book.. I thought I was doing 150 on dump trucks when I ran a fleet. about 4-5 /per year... jojo 1 Quote Link to comment https://www.bigmacktrucks.com/topic/69286-1995-e7-427-blowby/#findComment-490238 Share on other sites More sharing options...
theakerstwo Posted February 25, 2022 Share Posted February 25, 2022 As for as the blow/by you should make sure that its not steam from engine coolant in the oil.That will look like alot of blow/by.You can check the blow/by tube after it sits for a while and look for water drops. 2 Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/69286-1995-e7-427-blowby/#findComment-490239 Share on other sites More sharing options...
mechohaulic Posted February 25, 2022 Share Posted February 25, 2022 looking at the first picture, doesn't seem to show the white milky color on the cable or spring assy that would indicate coolant mixture . post also didn't say using coolant , as with many post, not being there to physically observe challenges. inside of vent tube should have milky film. i've seen brand new trucks with blow-by. not saying it's ok just lesser of the two evils. Quote Link to comment https://www.bigmacktrucks.com/topic/69286-1995-e7-427-blowby/#findComment-490240 Share on other sites More sharing options...
Joey Mack Posted February 25, 2022 Share Posted February 25, 2022 the picture is not wide enough for me... I think the oil on the spring is coming from the steering box and not the overboard breather.. I bet it runs fine, just needs more frequent maintenance, if hes not going to roll rods and mains and a new oil pump... jojo 2 Quote Link to comment https://www.bigmacktrucks.com/topic/69286-1995-e7-427-blowby/#findComment-490241 Share on other sites More sharing options...
Mack log truck Posted February 25, 2022 Author Share Posted February 25, 2022 Just now, Joey Mack said: the picture is not wide enough for me... I think the oil on the spring is coming from the steering box and not the overboard breather.. I bet it runs fine, just needs more frequent maintenance, if hes not going to roll rods and mains and a new oil pump... jojo I'll do oil changes more often, 2/3 of the hrs are @ 1,900hrs while running the log loader but I have no problem changing oil. And yes the steering boxes leak. It leaks oil at the small tube between the two valve covers, I'd like to fix that, what exactly is that doing? Quote Link to comment https://www.bigmacktrucks.com/topic/69286-1995-e7-427-blowby/#findComment-490242 Share on other sites More sharing options...
Joey Mack Posted February 25, 2022 Share Posted February 25, 2022 that little horse shoe tube is a fuel return jumper from head to head.. 7 pieces, buy all of them and replace it all new... no more leak... jojo 2 Quote Link to comment https://www.bigmacktrucks.com/topic/69286-1995-e7-427-blowby/#findComment-490243 Share on other sites More sharing options...
mechohaulic Posted February 25, 2022 Share Posted February 25, 2022 3 minutes ago, Joey Mack said: the picture is not wide enough for me... I think the oil on the spring is coming from the steering box and not the overboard breather.. I bet it runs fine, just needs more frequent maintenance, if hes not going to roll rods and mains and a new oil pump... jojo i second the motion!! motor oil dripping should have the "wet look". spring had the heavy gear oil (steering box) mix with road dirt etc. i would concentrate on the oil pressure. might be within spec. even oil gotten complicated. and $$$$$ . wifes car runs 0-20. who the hll ever heard of 0-20. higher vis oil might help the pressure on this unit with shorter intervals . nothing else shorter intervals might show improvement. no improve go back to 200 + hrs. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/69286-1995-e7-427-blowby/#findComment-490244 Share on other sites More sharing options...
Vmac3 Posted February 25, 2022 Share Posted February 25, 2022 I agree, Leave it alone. No knocks or clacking, oil pressure a bit low but nothing to worry about. Shorten the oil change interval with good quality oil and the truck will be fine. If the oil pressure drops below 15 then I would look into it. These engines are really reliable. V 1 Quote Link to comment https://www.bigmacktrucks.com/topic/69286-1995-e7-427-blowby/#findComment-490253 Share on other sites More sharing options...
MACKS Posted February 25, 2022 Share Posted February 25, 2022 10 hours ago, Mack log truck said: I'll do oil changes more often, 2/3 of the hrs are @ 1,900hrs while running the log loader but I have no problem changing oil. And yes the steering boxes leak. It leaks oil at the small tube between the two valve covers, I'd like to fix that, what exactly is that doing? If that fuel line between the heads is leaking I’m betting it starts a little hard after sitting a day or two.. Quote Link to comment https://www.bigmacktrucks.com/topic/69286-1995-e7-427-blowby/#findComment-490259 Share on other sites More sharing options...
Mack log truck Posted February 25, 2022 Author Share Posted February 25, 2022 1 hour ago, MACKS said: If that fuel line between the heads is leaking I’m betting it starts a little hard after sitting a day or two.. If that's a fuel line it must not be leaking because it's oil that i see, so must be from the valve covers? It starts great no matter how long it sits or 5-10 degree Temps. It has always started great, little bit of blue haze out of the exhaust but doesn't smoke once it's warm or under load. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/69286-1995-e7-427-blowby/#findComment-490262 Share on other sites More sharing options...
MACKS Posted February 25, 2022 Share Posted February 25, 2022 1 hour ago, Mack log truck said: If that's a fuel line it must not be leaking because it's oil that i see, so must be from the valve covers? It starts great no matter how long it sits or 5-10 degree Temps. It has always started great, little bit of blue haze out of the exhaust but doesn't smoke once it's warm or under load. Back in 2008 I started a thread on here about low oil pressure on 96 e-7 350 I was look ing to buy,well I bought it and still running it,still has low oil pressure at ideal and still runs awesome,500,000 miles doesn’t burn a drop of oil,great engines.. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/69286-1995-e7-427-blowby/#findComment-490263 Share on other sites More sharing options...
Mack log truck Posted February 25, 2022 Author Share Posted February 25, 2022 Not to change topics but I was under the truck and noticed some coolant on the surface of the lower tank and dripping off. If I pull the radiator can just a new lower tank be installed without getting to complicated? I can't tell for sure if it's coming from the gasket or coming through the metal but the lower tank is pretty rusty. Quote Link to comment https://www.bigmacktrucks.com/topic/69286-1995-e7-427-blowby/#findComment-490267 Share on other sites More sharing options...
doubleclutchinweasel Posted February 25, 2022 Share Posted February 25, 2022 I have heard of 15W-40 giving different oil pressure than SAE30. I know folks who swear by both! Quote "Eagles may soar, but weasels don't get sucked into jet engines." Link to comment https://www.bigmacktrucks.com/topic/69286-1995-e7-427-blowby/#findComment-490270 Share on other sites More sharing options...
MACKS Posted February 25, 2022 Share Posted February 25, 2022 1 hour ago, doubleclutchinweasel said: I have heard of 15W-40 giving different oil pressure than SAE30. I know folks who swear by both! I remember years back we would run straight 40W just to have better oil pressure.. 2 Quote Link to comment https://www.bigmacktrucks.com/topic/69286-1995-e7-427-blowby/#findComment-490282 Share on other sites More sharing options...
R.E.D Posted February 26, 2022 Share Posted February 26, 2022 3 hours ago, MACKS said: I remember years back we would run straight 40W just to have better oil pressure.. I always use a gallon of Lucas...some people hate it ,some people love it.. usually no in between..lol. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/69286-1995-e7-427-blowby/#findComment-490298 Share on other sites More sharing options...
R.E.D Posted February 26, 2022 Share Posted February 26, 2022 6 hours ago, Mack log truck said: Not to change topics but I was under the truck and noticed some coolant on the surface of the lower tank and dripping off. If I pull the radiator can just a new lower tank be installed without getting to complicated? I can't tell for sure if it's coming from the gasket or coming through the metal but the lower tank is pretty rusty. If it's metal ,it could be repaired by a good radiator shop.. plastic style in my opinion need replacement. Red 1 Quote Link to comment https://www.bigmacktrucks.com/topic/69286-1995-e7-427-blowby/#findComment-490299 Share on other sites More sharing options...
Bliue dm Posted February 26, 2022 Share Posted February 26, 2022 I've seen worst when it comes to blowby. Loader does use some hp but I'd run it. She'll let you know when she is tired 😫 1 Quote Link to comment https://www.bigmacktrucks.com/topic/69286-1995-e7-427-blowby/#findComment-490314 Share on other sites More sharing options...
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