No idea how long it was ran like this. 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. A connecting rod is about $105. A thin layer of oil coating all of the internal moving parts of your motor is what allows its components to rotate at extremely high speeds for thousands of miles without worrying about any damage. How much is ok ?? Run the piston down and check fore cylinder damage. ston is likely to take most of the damage. Number 1 piston/bore. How much damage will this have done? Share this post. Bores may be ok now. Valves and seats are fine too. This indicates that the bike's engine has been set up and jetted correctly. The first thing you will need to do is to check the status of your pistons – are they in good condition? Ok, I now have a pristine cylinder head ready to marry up to the block, but I'm concerned about number 4 piston. Slowing it down so that it hits the end of the compression chamber without causing any damage to the piston. A careful examination of the piston can help a mechanic trace the source of a mechanical or tuning problem. Find an appropriate feeler gauge to try to determine if the top of the piston has been beaten over and made to rub. Re: This CAN'T be good - piston damage Looking at your pictures the damage is typical trigger failure. 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? xonix_digital 0 xonix_digital 0 Junior Member; Members; 0 127 posts; Location Boston, MA; Trader Feedback. So, you should check and determine whether your piston is still in a good status. This damages the bore, which means a very expensive engine repair -- if it is repairable at all. When an engine failure occurs, the piston is likely to take the brunt of the damage. Piston Wrist Pin Damage Wrist pins can wear out prematurely if the pistons are not receiving enough splash lubrication, but they can also fail as a result of over-revving the engine or too much rod flex. 2,009 … I do not know how you can cause so much damage to the #4 piston and not hurt #1 as well. 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. BigBob : I should have said valve to valve bending, not valve to piston. 1 of 2 Go to page. Go Google 'detonation piston damage' and educate yourself on just how much damage can be caused. Piston pin "end play" ? I have two spare ('89)Force 85 HP motors and both have one cylinder damage/low compression (70 psi) The cylinder-wall are okay & I can Hone them. You cannot afford to have one of its functions go bad, let alone all of them. 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? JACUSTOMER-5b7sskfj- : Not that I know of the car just shut off and the check engine light came on. Was there some other damage done? It depends on how much internal damage and how the engine is blown. Recommended Posts. bbaxj. As you can see, the piston rings play a vital role in the functionality of your vehicle’s engine. Air bubbles aren’t a good lubricant. Advertisements … Audi TT 1.8T Broken Timing Belt Possible Piston Damage 02-18-2011 06:55 PM #1. 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. I usually put a belt on it and see if it is ok, but you can also do a leak down test to see. Below are the top 5 symptoms of bad piston rings. The pistons use round wire lock type pin retainers. 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. OK so just got the head off of my girlfriend's 2000 Audi TT 1.8T. Here are some bikes that used the same piston. The rest are not this bad, but I guess I have to act on the worst case. Sponsored Links Remove Advertisements. This will cause a certain amount of damage, dependent on the make and model of your gun. … This DOES NOT mean you need an engine. The old distributer type ignition will cause preignition on #1 & #3. Oil sample probably will not tell much either way.-Eric : 8 : Cummins:B Series: 4BT a little pop then power loss and some whitish gray smoke: Flabum : 12 : 2 : 25-Nov-16 Reply: Flabum : 14-Sep-16 : There is very little clearance between the head and piston when at TDC, hopefully the tip ended up in the piston cup. Go. Any one have an opinion on how bad this piston looks? How to check easily that are engine's pistons rings OK or wear out in car or truck? Careful e of the mechanical or tuning problem that's damaged pistons as well so The crown of the piston shows an ideal carbon deposit pattern. This debris can also collect in the bottom end of the engine. Cut issue and scored piston: how much is too much? 1) Too Much Exhaust Smoke. 119 months. Too much would be when the crankshaft and piston rod ends are hitting the oil in the crankcase. Step 2: Determine the Cause of Piston Slap. 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. The valves hit the pistons pretty bad and was curious if its worth just putting a new head or should i look further into the pistons, attached are picture let me know what you think . 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. Check for cylinder ridge indicating wear. A crankshaft is about $750. Can it be reused? References. Easy way to check, that are engine's pistons rings OK or not. 2 Photos. Why can’t I change the piston and fix whatever other damage it might have? 8,788 posts. I can only imagine how bad this thing sounded. Mar 30, 2006 #3. Sunday 14th June . Discussion Starter • #1 • Jan 22, 2017. please let me know if this piston damage is referred to as; melted piston IMG_1833.JPGIMG_1834.JPG Step 1: Check the Status of Your Piston As a matter of fact, piston slap is not truly destructive at all. The third function is to take heat away from the pistons so that it doesn’t damage the engine. Reply to this topic; Start new topic; Prev; 1; 2; Next ; Page 1 of 2 . Metal contact between the piston rings and the cylinder wall (Fig. Tore down a 2002 4.0 today that had compression issues. The mechanic first said that I need to get a new engine for 5 grand. Post by BillK » Fri Nov 20, 2020 8:59 pm. One key to a successful engine build is to prevent this from happening. Hey guys, One of my customers has a set of brand new forged pistons that he brought by for me to look at. Joined May 1, 2012 Messages 11 Location Michigan. 0 0 0. Hopefully the cylinder is ok. Would it be ok to clean up and reuse or bin it? 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. A Subaru '09 with 60.000 miles has a damaged piston. Feb 9, 2010 #1. This would cause the oil to foam and be full of little air bubbles. For this to happen would be at least one quart too much and probably much more than that. The other pistons look eroded also.Do not reuse this trigger!! Apr 28, 2014 . The average builder can certainly opt to use standard production-gapped rings to avoid this issue. After damage due to dirt, damage and wear caused by fuel flooding is the second most common cause of damage on piston rings. The transfer ports on the engine are flowing evenly and the carbon deposits are a dark ch ocolate brown colour. 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. As other people have mentioned here, a very small amount of water is not a problem. When a faulty air filter is replaced, this puts a temporary stop to further debris damage, but it does not reverse damage once it has occurred. This smoke will look very thick and have dark gray and blue colors to it. Next Last. Reply ... might be a slim chance of damage if doing flat out track days , will be ok under normal driving . Piston damage is not the only consequence of bad filtration. I used new rings and gave the cylinders a quick hone and ended up with 0.0045 piston clearance. 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). When you pulled the head what kind of damage did you see there. trickywoo. If the cylinders are damaged you will need to replace the cylinders. Were any of the srpings broken or stressed in anyway? Total Rating 0%. There are many common reasons for this problem. Besides the damage caused by blow-by gases, improper lubrication and free hydrocarbons in the oil, there may be mechanical damage evident. If the cylinder heads are damaged, they would need to be replaced. Finally, the last function of piston rings is to ensure the piston does not knock against the cylinder wall. Engine, Trans & Driveline. The plugs that came out were fine, I don't remember one ever breaking, never pinged. This technical article serves as a guide for the most common mechanical problems that plague engines. Apr 28, 2014 #1 Sorry for the novel, but I figure too much info is better than not enough. This will require you to get a good mechanic to dismantle the engine for you. Andrew Well-Known Member. I know some parts are different but i think 03 and 04 cylinders should go in without any other mods. Minor Piston Damage Sign in to follow this . If the crankshaft, crankcase, or cylinder head is damaged, you would be better off looking for another engine. The outer edge of the piston crown is badly pitted - see photo. It was surprisingly quiet, probably due to the piston pin offset and the octagonal expander rings. What caused this? 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. Thoughts? The worst case is that is can cause internal damage to your air rifle, requiring new components. Followers 4. Engine was a mild n/a setup, never an issue made over 260rwhp. Too Much of a Good Thing. By xonix_digital, November 7, 2010 in Nissan L6 Forum. 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 … Thread starter bbaxj; Start date Apr 28, 2014; 1; 2; Next. This leads to premature bearing and seal failure. What's worse, in an engine this hot, the pistons might swell. 1-PERFECT BROWN CROWN The crown of this piston shows an ideal carbon pattern. It is often accompanied with a burning oil smell. Tony1963. GTM Proven Member. Sure, it is somewhat noisy, but this issue does not cause much wear. Joined: Nov 8, 2009 Location: Smithtown Local Time: 4:02 AM. Posted November 7, 2010. Piston 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. In the event of fuel flooding, the oil film on the cylinder wall suffers so significantly that the piston rings rub metal on metal against the cylinder wall and quickly lose radial wall thickness. 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. 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. Minor Piston Damage. Messages: 206 Likes Received: 5. bbaxj ArboristSite Lurker. 137 Posts . 2,479 posts.