bstclee Posted June 9, 2009 Share Posted June 9, 2009 I had issues with my truck last fall with a leaking valve cover. I had both of them redone in November and did'nt run it that much until a month ago. It is leaking again with a vengence. About a gallon + in a eight hour day. What a mess. I am getting my radiator recored this week so I have some time to fix the leaking oil problem. Quote Link to comment https://www.bigmacktrucks.com/topic/9660-e6-2-valve-valve-cover-oil-leaking-issue/ Share on other sites More sharing options...
Rob Posted June 9, 2009 Share Posted June 9, 2009 I had issues with my truck last fall with a leaking valve cover. I had both of them redone in November and did'nt run it that much until a month ago. It is leaking again with a vengence. About a gallon + in a eight hour day. What a mess. I am getting my radiator recored this week so I have some time to fix the leaking oil problem.Ensure the sealing flange of the rocker cover is perfectly flat and not deformed in any fashion. Also use the black neoprene gaskets, and a bit of gasket cinch to keep it from moving. I've not had good luck with silicone in a high vibration environment.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/9660-e6-2-valve-valve-cover-oil-leaking-issue/#findComment-36371 Share on other sites More sharing options...
fjh Posted June 9, 2009 Share Posted June 9, 2009 Ensure the sealing flange of the rocker cover is perfectly flat and not deformed in any fashion. Also use the black neoprene gaskets, and a bit of gasket cinch to keep it from moving. I've not had good luck with silicone in a high vibration environment.RobAs stated gasketsinch, I have found this method to work well ,apply Two coats to the lid two coats to the gasket let it dri between coats stick the gasket to the lid after a 10-15 minute dri time assemble to a clean oil free surface.silicone is an absolute no no. Quote Link to comment https://www.bigmacktrucks.com/topic/9660-e6-2-valve-valve-cover-oil-leaking-issue/#findComment-36377 Share on other sites More sharing options...
theakerstwo Posted June 9, 2009 Share Posted June 9, 2009 Silicone is like a lub and will let the gasket squirt out the side when clamped down plus the silicone some times will get off inside of the egine in glubs and get into the oil pump screen or if used on coolant seals then it will get into the oil cooler or rad. Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/9660-e6-2-valve-valve-cover-oil-leaking-issue/#findComment-36389 Share on other sites More sharing options...
MACKS Posted June 9, 2009 Share Posted June 9, 2009 Silicone is like a lub and will let the gasket squirt out the side when clamped down plus the silicone some times will get off inside of the egine in glubs and get into the oil pump screen or if used on coolant seals then it will get into the oil cooler or rad.I had a tranny fail once,the back end of a quad box,the reason was a small piece of blue silicone went in the shaft and plugged the oil hole under one of the gears. Quote Link to comment https://www.bigmacktrucks.com/topic/9660-e6-2-valve-valve-cover-oil-leaking-issue/#findComment-36399 Share on other sites More sharing options...
Rob Posted June 9, 2009 Share Posted June 9, 2009 I've got a 1693TA in my 78 R model Mack with a fresh "inframe" and I need to pull it due to massive oil leakage. This thing is loaded with red silicone and it is squeezed out of every nook and crannie the I've found and the engine is a mess. 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/9660-e6-2-valve-valve-cover-oil-leaking-issue/#findComment-36402 Share on other sites More sharing options...
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