Perkins 300d

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I recently re-ringed a perkins 300d. The engine ran perfectly . The complaint was a little puff of blue from low to high idle. The head was inspected and was found to be all right , they lapped and seated the valves, and installed new valve stem seals. The engine again runs perfectly ,but still gives a puff of blue from low to high idle. Just to note , when the engine is still cold this does not happen. Lincoln says this is normal , but I think it's BULL , as a few of my friends have these and do not have this symptom. HAS ANYONE HAD OR HEARD OF THIS, ANY ADVICE WOULD BE APPRECIATED. ThanksKen
Reply:What viscosity of oil are you using?Who did the piston ring job? Are you confident all went well? Does that engine have oil control rings? How did the cylinder walls look?How is the fuel quality? age, etc?-Ryan
Reply:Did you load bank your machine after the overhaul to set your new rings in, then I'd say that the blue smoke is not normal. However, if you didn't , then yes. I get this with the new machines on predelivery inspections.If I don't load bank them, I tell the customers to get a case of beer, some scrap, a 10lb box of 3/16" and weld it till it's gone. Blue smoke is gone after that too.
Reply:Yes the rig job was done by a reputable Perkins repair shop. I was told the cylinders looked good . The old cross hatching still visible. The machine is on my truck , fresh and good quality fuel is used. The welder was put on a load-bank to break the engine in. I use 15w40 oil. I believe the bottom ring is an oil ring with scrapers.Ken
Reply:Just put a near max load on it for about 1 or 2 hours:   work the dog snot out of it.  Will either cure or kill----probably cure.  Perkins seem to be very hard to seat the rings on.
Reply:This was just a ring job? There was no boring done if I am understanding this correctly. Did they use a "hone" or a "glaze breaker" on the cylinders.This is a HONEThese are often called HONES but they are really "Glaze Breakers"The big difference is that a hone makes the holes round again.A glaze breaker just scratches up the surface to provide a surface to break in the rings. Cylinders in an engine get wider crossways in relation to the crank. If you just "glaze break" you had better use cast rings or you will have a hard time breaking them in.I would doubt that there are even cast rings available for a Perkins diesel.Rings made of harder materials really need to be honed to straighten out the bores in order to break in properly.Something about this "lapping thing" makes me not trust this shop. and if they thought it was leaking oil past the valve stems, what they should have done is replace the guides and possibly the valves.just whatever you do don't let them give it the "Babbo Treatment"Way back in the day when chrome rings first came out, guys were having trouble breaking the rings in. sometimes a customer would let a new machine sit and idle and the rings would never break in.So the solution was "Give it the Babbo treatment"You would sprinkle Babbo Cleanser in the intake while the engine was running. the Babbo was abrasive and it would break the rings in in a big hurry.Really not a recommended procedure  More of a Git-R-Done kind of thing.Last edited by joethemechanic; 03-16-2008 at 09:37 PM.Joewww.CummingsHauling.com
Reply:I really didn't ask which tool was used. I will ask him this week. I don't think he suspected oil leaking past the valves, I asked him to check the head and repair as necessary. The shop is DSG Canada , a big shop with more than one location in my province. Another thing ,if i burn about 15 or 20 1/4" welding rods one after another(a heavy load)  . the puff of blue from low to high idle stops . Then letting it idle and burning small rods for an hour and the symptoms return. I don't consider the oil consumption high, about 1/2 a quart in 200 hrs.Ken
Reply:I would ask to see what they used to "hone the cylinders" if it is one of those ball things or 3 stones on arms with a spring they did it wrong.If you ask they will probably say hone. Most mechanics sadly don't know the difference.Joewww.CummingsHauling.com
Reply:Thanks for the info.Ken
Reply:Where was the engine repaired? An engine shop with a loadbank would be a rarity.
Reply:Originally Posted by CruizerWhere was the engine repaired? An engine shop with a loadbank would be a rarity.
Reply:It was repaired at DSG Canada, in Saskatoon, Saskatchewan, in Canada. They are a Perkins warranty depot. There is a welder repair shop near. They bring load bank over. I think they load for 2 or 3 hrs as Lincoln recomendsKen