thunderroaddrayage
Posts: 14
Joined: Sep 2002
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Monday September 02, 2002 13:13
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Most any diesel engine will glaze the cylinder walls if they are run excessivly at low R.P.M.s or idle.Youre best hope is what was allready mentioned.Fill the crankcase with light oil,run it under a heavy load and hope.Keep a sharp eye on youre temperature gauges while attempting this.Basically what youre trying to do is use the increased friction of the piston rings running in light oil to generate heat and dissapate the glaze.The glaze is just unburned fuel and oil deposits burned onto the cylinder walls by the higher combustion heat generated at low R.P.M.s when the cylinder is scavenging exhaust gases less eficeintly due to lower port velocity.The glaze fills in the cross hatch pattern on the cylinders from when they were honed during production and the piston rings no longer seal.The only sure way to remove glaze is to rehone the cylinders after wiping them down with a good degreaser like sray can either.Either makes a much better degreaser than it does a starting agent.re-honing would be expensive because the pistons must be removed.You would be one step away from a rebuild.Some people have had good results in de-glazing highway engines by using "marvel mystery oil".Yes,thats really the name of it.It is availible at any auto parts store here in new england,but a good parts man should be able to track it down for you worldwide.They might have a web site.For trucks it goes like this.Fil the crankcase up with 50% marvel,50% new oil,and install new filters.Hook it onto a loaded trailer,drive it one to one and a half hours at full throttle(use a lower gear in the transmission if neccessary to stay at the speed limit),turn around and drive back the same way.Drain immediatly while still warm(not hot enough to burn you).refill and replace filters.Substitute one gallon of marvel for one gallon of normally used oil.Drive normally there after.The theory is that the initial use of the marvel breaks the face of the glaze and softens it.Using a gallon of marvel on every change after continues to chip away at it.Marvel is a light oil most commonly used as a penetrating oil with excellent results.As for de-glazing,I've seen it work for some,not for others.Youre problem doesnt sound that severe,so who knows.To make a simple positive crankcase ventilation system,remove youre breathers from youre valve covers(if thats were they are).Look at the mounting style,grommett mount push ins,gasket mount twist ins,ect,ect.Go to A large automotive parts store.Look at what they have availible for cars and pickups with gas engines that had valve cover breathers that had hose nipples on them to route a rubber hose up to the base of the air filter housing.This was the earliest emmisions system,early to mid 70's.Dodge&plymouth used several styles and sizes like this.You will need a cooperative counter man who wont mind you opening lots of boxes.Once you find the right ones,then you need a couple of hose bungs that will take the same size hose as the breathers.Install them in youre intake tubing,hook up two peices of rubber line,and youre ready to go.A p.v.c. not only takes care of oil vapor,but it actually promotes better ring sealing,so this might also help with youre glaze problem beyond just cleaning up the mess.Hope this helps.
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