i bought an SL 760 Hyundai shan dong in dec 2012 after 650 hours approxymatly , it started consuming engine oil we brought it to Hyundai , they open the engine and found one broken segment and all other are sharpen but the cranshaft is ok! THEY TOLD ME ITS BECAUSE THEY FOUND SILICA SAND INSIDE THE ENGINE AND THEY DONT WANT TO PUT IT UNDER THE WARRANTY THEY WANT TO CHARGE ME FOR THE REPAIR AND THE PARTS; I M NOT A MECHANIC SPECIALIST , SO PLEASE IF ANYBODY KNOWS ABOUT IT AND CAN HELP !!!! THKS IN ADVANCE
Sounds like its been getting sand into the air intake some how, loose hose clamps, hole in air filter element, hole in rubber hoses some where, definately shouldnt have sand inside the engine. Cheers RDG.
sand can break a ring ?
To cast an engine block, sand is required for the process. I have seen pockets of sand left in corners of castings before, considering the number of hours on the machine, it maybe possible. But questions need to be asked. How much sand was found in the engine? Does it look like anything on or around where the machine was working? Has a close inspection of engine oil fill point/s been made to find how or where it entered? Is it possible that the machine was vandalized by former employee or other wayward person? Alot of factors are involved, & new engines generally don't come with sand in them..... the dealers will be leaning toward vandalism as the likely cause. edit - I just saw the pics you loaded. Was the sand in the pan or in the air intake?
hi the spots of sand are very fine and not significant, it is impossible that its vandilized, they found it in the oil pan, and they say that it came from the air filter !
when they scratch the valve with a knife they say its sand came from it !
Its in my opinion that your problems are not the result of manufacturer defect. Why cause your machine is a year and a half old, and has 650 hrs at the point of failure. If it was a sand pocket in the block, it would should have had probably 4 oil changes to flush it out, and the damages would have been noticeable immediately. With the motor broke in now, I'm leaning towards vandalism or air intake failure. Silica sand is rather hard and the same material that sandpaper is made with, it doesn't take 650 hrs for it to wreck a motor, from what I've heard depending on amounts, 50 hrs would be enough to trash a motor.
personnally i m not surprise that the dust came from their spot ; the engine is stopped since MAY 10 th in an open spot in hyundai Tunisia !
the engine is parked outside since MAY 10 th 2013 with all the dust and very dirty place ( it bacame like a dump area ) Very professional coming from a big company like hyundai !!!!
its a 7 months old machine and the problem starts after 4 months , i think its a bad quality of rings that they put on IT !! what do you think?
If the sand / dust has entered from the intake, there will be a clear & distinct trail of contamination from the leakage area. Take a good look inside the intake hoses, intake manifold, intake ports of the cylinder heads - they should all be clean with no trace of ANY dust.
I have never worked on these engines but Im not too sure about those valves. I have seen ceramic coated valves like that before. Does anyone know if that may be a coating? What does the rest of the intake look like?
Do you have a better picture of the side of the ring?
no other pic of the ring but theyare very sharp
What about down the hole?
I ll try to take more pic and post them!
But could it be a bad quality of rings that they put in that machine?
From what I see so far, the engine has been dusted but you need better pictures, we need to see what the cylinder walls look like and what the remainder of the intake piping looks like. Can your dealer tell you the source of the dust? If it was bad air filter cleaning practices or if there was a clamp left loose. If there is silica in the oil sample the number one source of is on the intake piping side. It comes through the intake and passes the rings into the oil. If there is so much sand in the pan that they can see then there may be a chance someone put it there.
how often do-have been changing or blowing out the air filters?
We changed 3 times the air filter , every service check , but we blow it twice or three times a week! Depending if its windy or not
That may be where the sand came from over servicing of air filters , check restriction gauge before servicing .if in a very dust area ,work in a talc mine in Western Australia and we were change filters every 4hrs so ended up putting to filers in line oil bath first then standard filter.most machinery is not made for hot and dusty county a/c never get cold ,filter to small.
So am I the only one that can see the broken piston ring?
I think it was dusted, again check intake circuit...... I think the white on valve is ceramic coating as it appears it is a exhaust valve. Broken ring? Hard to say, have you ever ran it out of fuel and used ether to start it ? Sounds like your trying to talk the forum into agreeing with you on bad rings..... IMO your wrong, chalk it up to vandalism, a hole in intake circuit or etc. As far as the ring being "sharp" they will have a nice square edge on them against the cyl wall..... They travel up and down at the speed of light in some pretty harsh conditions so yes they will show wear. On a side note, have you checked the air filter to make sure there is no holes and also to verify that the correct filters were used ? Pj
First I would be inspecting the air intake ducts very carefully for any possible signs of dust entry. Maybe at a clamp that wasn't quite tight, maybe a hose that was not installed far enough on to a metal tube. If you take a clean white cloth and wipe it around the inside of the air intake duct, is there any trace of dust on it when it comes out..? Regarding the broken ring, if the engine has had significant quantities of dust through it then the ring will have worn to such an extent that the groove will no longer support it correctly and thus the ring will likely break. As others have said here if dust gets into an engine it might only have to run a few hours (50 would be more than enough) to do the damage that is allegedly seen in the engine. Note that I say allegedly because none of the photos posted so far are taken from close enough to show sufficent detail to remove the word "allegedly" from the comment. If someone asked me to do a failure analysis simply on the basis of the photos as opposed to be able to go into the workshop and look at the failed iron I would respectfully decline because there is not enough detail in any of them to come to a logical conclusion regarding what caused this problem. That's no disrespect to the person taking the photos, most likely they did not realize the level of detail required to do a failure analysis purely on the basis of photos. A few comments were made regarding the condition of the valves. Can the dealer show you an engine that they are in the process of rebuilding at the moment in which they consider the valves good..? Take photos and compare the two engines regarding the condition of the valves.
I think the valves look like they usually does after a while, carbon and soot buildup and that isn't always black. when you scratch them you get something that could be mistaken for sand. And an engine sucking dust and breaking a piston ring because of that with out gouging the hell out of the pistons before that happens....not likely. The coating on the pistons look like new.
I agree, from here everything looks tolerable, except the broken rings, and maybe wiped bearings? hard to tell from a picture. If the engine inhales sand (or dust), isn't it going to end up pretty sharp by the time it settles in the oil pan? If there's round sand inside the engine, I'd be sticking to my guns for it to be covered as a defect. Kind of hard to prove anything after they leave it torn apart with windblown dust everywhere...