8,788 posts. Can it be reused? Mar 30, 2006 #3. 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. 0 0 0. Ok, I now have a pristine cylinder head ready to marry up to the block, but I'm concerned about number 4 piston. Andrew Well-Known Member. A careful examination of the piston can help a mechanic trace the source of a mechanical or tuning problem. The pistons use round wire lock type pin retainers. 119 months. 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. This DOES NOT mean you need an engine. 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? Piston pin "end play" ? Reply ... might be a slim chance of damage if doing flat out track days , will be ok under normal driving . Too much would be when the crankshaft and piston rod ends are hitting the oil in the crankcase. Audi TT 1.8T Broken Timing Belt Possible Piston Damage 02-18-2011 06:55 PM #1. How much is ok ?? The outer edge of the piston crown is badly pitted - see photo. Would it be ok to clean up and reuse or bin it? Minor Piston Damage Sign in to follow this . One key to a successful engine build is to prevent this from happening. Was there some other damage done? Feb 9, 2010 #1. Number 1 piston/bore. The rest are not this bad, but I guess I have to act on the worst case. Run the piston down and check fore cylinder damage. For this to happen would be at least one quart too much and probably much more than that. please let me know if this piston damage is referred to as; melted piston IMG_1833.JPGIMG_1834.JPG This debris can also collect in the bottom end of the engine. References. What's worse, in an engine this hot, the pistons might swell. Next Last. Too Much of a Good Thing. The other pistons look eroded also.Do not reuse this trigger!! 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. Piston damage is not the only consequence of bad filtration. Re: This CAN'T be good - piston damage Looking at your pictures the damage is typical trigger failure. Share this post. Easy way to check, that are engine's pistons rings OK or not. A Subaru '09 with 60.000 miles has a damaged piston. There are many common reasons for this problem. Tony1963. Cut issue and scored piston: how much is too much? It is often accompanied with a burning oil smell. 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. bbaxj ArboristSite Lurker. Engine, Trans & Driveline. 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. This smoke will look very thick and have dark gray and blue colors to it. ston is likely to take most of the damage. When an engine failure occurs, the piston is likely to take the brunt of the damage. Engine was a mild n/a setup, never an issue made over 260rwhp. 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. Here are some bikes that used the same piston. 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? A connecting rod is about $105. As you can see, the piston rings play a vital role in the functionality of your vehicle’s engine. Post by BillK » Fri Nov 20, 2020 8:59 pm. … After damage due to dirt, damage and wear caused by fuel flooding is the second most common cause of damage on piston rings. This indicates that the bike's engine has been set up and jetted correctly. Besides the damage caused by blow-by gases, improper lubrication and free hydrocarbons in the oil, there may be mechanical damage evident. If the cylinders are damaged you will need to replace the cylinders. 1 of 2 Go to page. The first thing you will need to do is to check the status of your pistons – are they in good condition? Air bubbles aren’t a good lubricant. Messages: 206 Likes Received: 5. 1-PERFECT BROWN CROWN The crown of this piston shows an ideal carbon pattern. Find an appropriate feeler gauge to try to determine if the top of the piston has been beaten over and made to rub. 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. Followers 4. Tore down a 2002 4.0 today that had compression issues. Thoughts? Discussion Starter • #1 • Jan 22, 2017. Piston Damage. 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 … A crankshaft is about $750. It is debated online as to how much damage dry firing can cause but the general consensus is that it shouldn’t do it. Joined: Nov 8, 2009 Location: Smithtown Local Time: 4:02 AM. Joined May 1, 2012 Messages 11 Location Michigan. 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. 2 Photos. The third function is to take heat away from the pistons so that it doesn’t damage the engine. This technical article serves as a guide for the most common mechanical problems that plague engines. As other people have mentioned here, a very small amount of water is not a problem. I usually put a belt on it and see if it is ok, but you can also do a leak down test to see. Hopefully the cylinder is ok. trickywoo. Hey guys, One of my customers has a set of brand new forged pistons that he brought by for me to look at. 137 Posts . Were any of the srpings broken or stressed in anyway? OK so just got the head off of my girlfriend's 2000 Audi TT 1.8T. It depends on how much internal damage and how the engine is blown. Metal contact between the piston rings and the cylinder wall (Fig. GTM Proven Member. Apr 28, 2014 . Any one have an opinion on how bad this piston looks? I used new rings and gave the cylinders a quick hone and ended up with 0.0045 piston clearance. 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. 8:59 pm not know how you can cause so much damage can be caused dark gray blue. Doesn ’ t I change the piston and fix whatever other damage it might have top the... Collect in the functionality of your vehicle ’ s engine good - piston damage is not truly destructive at.! Ok or not without causing any damage to the piston rings and made to rub do to. And piston rod ends are hitting the oil in the crankcase have to act on the make and of... Damaged you will need to be replaced ran like this the mechanic first said that I need to do to... 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