This would cause the oil to foam and be full of little air bubbles. A careful examination of the piston can help a mechanic trace the source of a mechanical or tuning problem. Hopefully the cylinder is ok. Piston pin "end play" ? 1) Too Much Exhaust Smoke. If the cylinders are damaged you will need to replace the cylinders. Engine was a mild n/a setup, never an issue made over 260rwhp. Number 1 piston/bore. Share this post. The average builder can certainly opt to use standard production-gapped rings to avoid this issue. A Subaru '09 with 60.000 miles has a damaged piston. I can only imagine how bad this thing sounded. In June last year I put together a top end using some used (low mileage) stock pistons and some relatively high mileage ported cylinders (first over). The worst case is that is can cause internal damage to your air rifle, requiring new components. Run the piston down and check fore cylinder damage. 0 0 0. Mar 30, 2006 #3. Sunday 14th June . A crankshaft is about $750. If you have a spring-piston or gas-ram airgun then you shouldn’t dry fire it unless the manufacturer’s instructions explicitly say you can do this. If the crankshaft, crankcase, or cylinder head is damaged, you would be better off looking for another engine. I usually put a belt on it and see if it is ok, but you can also do a leak down test to see. Now he is looking for other options This car can be sold -in good condition- for about 12.000 but without the engine is worth 4-5.000 should I put a new engine to a 4 year old car? Why can’t I change the piston and fix whatever other damage it might have? Upon disassembly I found my #4 ACL piston beaten up, appears to be damage from maybe a spark plug ground strap or some other foreign body? Apr 28, 2014 #1 Sorry for the novel, but I figure too much info is better than not enough. So, you should check and determine whether your piston is still in a good status. It depends on how much internal damage and how the engine is blown. For this to happen would be at least one quart too much and probably much more than that. This indicates that the bike's engine has been set up and jetted correctly. Piston damage is not the only consequence of bad filtration. GTM Proven Member. Joined: Nov 8, 2009 Location: Smithtown Local Time: 4:02 AM. Advertisements … Cut issue and scored piston: how much is too much? The pistons use round wire lock type pin retainers. 1 of 2 Go to page. As other people have mentioned here, a very small amount of water is not a problem. Messages: 206 Likes Received: 5. Piston Damage. 119 months. The old distributer type ignition will cause preignition on #1 & #3. Joined May 1, 2012 Messages 11 Location Michigan. bbaxj. Too much would be when the crankshaft and piston rod ends are hitting the oil in the crankcase. Part # = 43048-006 Part Description = CALIPER PISTON Model Count = 13 Model Name Year Size Description Type KH400-A3 76 400 KH400 STREET KH400-A4 77 400 KH400 STREET KH400-A5 78 400 KH400 STREET KH500-A8 76 500 KH500 STREET KZ750-B1 76 750 750 LTD TWIN LTD STREET KZ750-B2 77 750 750 LTD TWIN LTD … Here are some bikes that used the same piston. Easy way to check, that are engine's pistons rings OK or not. 2,479 posts. A lot of good suggestions, but let me give my perspective, as I've rebuilt the engines of three of the cars I drive First, just because of the blue smoke, don't throw in the towel. Even in a mild case where the ring ends barely touch, the result can be a heavily scored cylinder wall and serious piston-ring-land damage due to this excessive load. Tony1963. How much is ok ?? OK so just got the head off of my girlfriend's 2000 Audi TT 1.8T. ston is likely to take most of the damage. It is debated online as to how much damage dry firing can cause but the general consensus is that it shouldn’t do it. please let me know if this piston damage is referred to as; melted piston IMG_1833.JPGIMG_1834.JPG If there is a lot of exhaust smoke coming out of your vehicle, this could be an easy sign that you have bad piston rings. This damages the bore, which means a very expensive engine repair -- if it is repairable at all. This leads to premature bearing and seal failure. 8,788 posts. Bores may be ok now. I used new rings and gave the cylinders a quick hone and ended up with 0.0045 piston clearance. bbaxj ArboristSite Lurker. When you pulled the head what kind of damage did you see there. What's worse, in an engine this hot, the pistons might swell. References. trickywoo. How much damage will this have done? Go Google 'detonation piston damage' and educate yourself on just how much damage can be caused. The only cause I can think of would be something in the valve train and the since one was not touched I would look at the springs first. Posted November 7, 2010. Tore down a 2002 4.0 today that had compression issues. Valves and seats are fine too. While the piston slap is annoying, it does often not cause much damage to the car, and you can continue driving your car for miles if it’s not too worn or burns too much oil. As you can see, the piston rings play a vital role in the functionality of your vehicle’s engine. This technical article serves as a guide for the most common mechanical problems that plague engines. This smoke will look very thick and have dark gray and blue colors to it. When an engine failure occurs, the piston is likely to take the brunt of the damage. Any one have an opinion on how bad this piston looks? The mechanic first said that I need to get a new engine for 5 grand. Thread starter bbaxj; Start date Apr 28, 2014; 1; 2; Next. Apr 28, 2014 . Ok, I now have a pristine cylinder head ready to marry up to the block, but I'm concerned about number 4 piston. Metal contact between the piston rings and the cylinder wall (Fig. Andrew Well-Known Member. The rest are not this bad, but I guess I have to act on the worst case. Minor Piston Damage Sign in to follow this . Hey guys, One of my customers has a set of brand new forged pistons that he brought by for me to look at. I know some parts are different but i think 03 and 04 cylinders should go in without any other mods. It is often accompanied with a burning oil smell. Air bubbles aren’t a good lubricant. Can it be reused? 137 Posts . You cannot afford to have one of its functions go bad, let alone all of them. All piston rings appear sound as there was good compression prior to head being removed, and oil soak test shows no oil seeping past rings. No idea how long it was ran like this. There are many common reasons for this problem. Discussion Starter • #1 • Jan 22, 2017. This will cause a certain amount of damage, dependent on the make and model of your gun. A worn crankshaft thrust bearing that allows too much back-and-forth movement of the crankshaft can flex and twist the rods as the engine runs. Would it be ok to clean up and reuse or bin it? Engine, Trans & Driveline. Reply to this topic; Start new topic; Prev; 1; 2; Next ; Page 1 of 2 . Was there some other damage done? The plugs that came out were fine, I don't remember one ever breaking, never pinged. It was surprisingly quiet, probably due to the piston pin offset and the octagonal expander rings. I dont know how much it usually costs to have one honed and replated but i dont see any aftermarket ones available for before 03 Actually i just did some searches and it looks like 94 through 04 cylinders are the same. Check for cylinder ridge indicating wear. Reply ... might be a slim chance of damage if doing flat out track days , will be ok under normal driving . Were any of the srpings broken or stressed in anyway? Step 1: Check the Status of Your Piston As a matter of fact, piston slap is not truly destructive at all. Next Last. The ends of the rings can gouge the cylinder wall, preventing the other rings from making good contact with the cylinder walls and exacerbating the symptoms. Below are the top 5 symptoms of bad piston rings. The outer edge of the piston crown is badly pitted - see photo. This debris can also collect in the bottom end of the engine. 2,009 … The transfer ports on the engine are flowing evenly and the carbon deposits are a dark ch ocolate brown colour. I do not know how you can cause so much damage to the #4 piston and not hurt #1 as well. Followers 4. Feb 9, 2010 #1. When the air rifle is dry fired, there is no pellet to slow the piston due to air resistance, making the piston hit the end of the compression chamber under much greater pressure. xonix_digital 0 xonix_digital 0 Junior Member; Members; 0 127 posts; Location Boston, MA; Trader Feedback. After damage due to dirt, damage and wear caused by fuel flooding is the second most common cause of damage on piston rings.