JeremyB123 Posted January 26, 2018 Share Posted January 26, 2018 Hey guys, I've got my EJ255 engine sitting on an engine stand, the heads are at the machine shop and the turbo is being rebuilt. The heads came off last night (despite the stupid camshaft sprocket bolts!) and I noticed cylinder 1 has some damage. Most of it being right on the top (crown) of the piston. I'd love to hear what you guys would do in this situation as I'm not highly experienced rebuilding engines and I have some reticence about delving deeper. The guy at the machine shop says the head looks fine despite just a bit of damage. He is concerned that the piston rings could have caught the foreign object. https://photos.app.goo.gl/TiVnuzJzq7XCcnGQ2 https://photos.app.goo.gl/hUqf1twANlXFBXaZ2 I was having some occasional misfiring for the last couple years...I once got a misfire code but it was for cylinder 3 so not sure there is any connection. What do you think? Seems like there was no problem before so do I just leave it alone? Or dig even deeper into this mess? Link to comment Share on other sites More sharing options...
DrD123 Posted January 26, 2018 Share Posted January 26, 2018 Do you know how it happened? What does the cylinder wall look like? Link to comment Share on other sites More sharing options...
JeremyB123 Posted January 26, 2018 Author Share Posted January 26, 2018 Do you know how it happened? What does the cylinder wall look like? I wish I had a picture of the wall. It really doesn't look "scored" or "scratched" at all. But I will say you can see some markings where it was rubbed. Based on the cylinder wall I would say it doesn't look like anything is currently wedged int the piston rings. As for the cause...about 6 months (maybe 2,000 miles ago) I fired up the car to an AWFUL racket that sounded like it was rhythmic with the engine as it idled. I thought maybe a bad lower end knock or something being bashed around inside the motor. But as I pulled off the turbo I saw that the compressor wheel was badly dinged up. So clearly it sucked some foreign object into it...whether that made it into the cylinder is unknown. Link to comment Share on other sites More sharing options...
Shadow_419 Posted January 27, 2018 Share Posted January 27, 2018 I'd be a little weary of just letting it be. A light hone if the cylinders are decent and new piston + rings all around would be my preference. Your mechanic/machine shop will have there opinions for you. If you trust them, go with they're suggestions Link to comment Share on other sites More sharing options...
JeremyB123 Posted January 27, 2018 Author Share Posted January 27, 2018 I'd be a little weary of just letting it be. A light hone if the cylinders are decent and new piston + rings all around would be my preference. Your mechanic/machine shop will have there opinions for you. If you trust them, go with they're suggestions Yeah you're probably right...I'm really considering replacing the piston and rings at minimum on cylinder 1 where the damage is. I'm trying not to dump too much money into it at this point but definitely want to be wise with how much work has already been done to get to this point... Link to comment Share on other sites More sharing options...
Max Capacity Posted January 29, 2018 Share Posted January 29, 2018 Do it right the first time. You'll save money in the long run. 305,600miles 5/2012 ej257 short block, 8/2011 installed VF52 turbo, @20.8psi, 280whp, 300ftlbs. (SOLD). CHECK your oil, these cars use it. Engine Build - Click Here Link to comment Share on other sites More sharing options...
Recommended Posts
Archived
This topic is now archived and is closed to further replies.