skydawg Posted August 5, 2022 Share Posted August 5, 2022 Hi,is visible smoke from the road vent(crankcase) to be expected or is it indicative of excessive blowby?Would this be a deal breaker for a buyer who couldn`t afford an engine rebuild.The engine seems healthy otherwise.Thanks for any advice. Quote Link to comment https://www.bigmacktrucks.com/topic/70234-endt-673-engine-from-1961/ Share on other sites More sharing options...
D-Day Posted August 5, 2022 Share Posted August 5, 2022 Visible smoke is normal even a little oil, excessive smoke is usually accompanied by a fair amount of oil dripping 2 Quote Link to comment https://www.bigmacktrucks.com/topic/70234-endt-673-engine-from-1961/#findComment-505411 Share on other sites More sharing options...
mechohaulic Posted August 5, 2022 Share Posted August 5, 2022 while working at a Mack dealer early '70's a major construction Co bought 20 brand new DM's . a few had blow by from valve cover vent. wasn't considered a problem. on the other hand, a used truck depending on mileage /hrs ; blow by doesn't always mean a needed engine rebuild. open oil filler cap while it's running; how much blow-by out the cap vs out the vent. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/70234-endt-673-engine-from-1961/#findComment-505412 Share on other sites More sharing options...
Popular Post Joey Mack Posted August 5, 2022 Popular Post Share Posted August 5, 2022 (edited) one thing I do is put my hand over the end of the tube and just feel the draft.. (I just did this for the ASET-C I just built) I could feel the puffing of the engine, After I took it down, #3+#4 pistons had stuck rings, both were the #2 compression rings. My point here is that if it is not puffing hard it's good, if its just warm and cuddley, and not puffing into my hand.... It's good.. sometimes just how the steam leaves the pipe can tell you.. If it just drifts away, its probably good. if it blows to the ground,, ya got an issue.. Come on Glenn,, Tell me I'm right??? jojo Edited August 5, 2022 by Joey Mack more content needed 3 Quote Link to comment https://www.bigmacktrucks.com/topic/70234-endt-673-engine-from-1961/#findComment-505413 Share on other sites More sharing options...
mowerman Posted August 7, 2022 Share Posted August 7, 2022 Joey you are a genius it generally means the engine is getting tired most times worn compression rings These days rebuild kits are so expensive and you’re almost better off to find a used engine and I understand Mack doesn’t sell them anymore for the END series bob Quote Link to comment https://www.bigmacktrucks.com/topic/70234-endt-673-engine-from-1961/#findComment-505536 Share on other sites More sharing options...
mowerman Posted August 7, 2022 Share Posted August 7, 2022 (edited) But if you continue to drive it you risk spinning a bearing or a risk or wrist pin bushing but like Joey said if it’s not puffing that bad you probably don’t have anything to worry about I would be more concerned about exhaust smoke Bob Edited August 7, 2022 by mowerman Misspelled Quote Link to comment https://www.bigmacktrucks.com/topic/70234-endt-673-engine-from-1961/#findComment-505537 Share on other sites More sharing options...
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