Ej25 Head Rebuild | 2010 Subaru Legacy GT

There was a check engine light in my 2010 Subaru Legacy gt and I had zero compression in cylinder 3. Found a burnt valve was causing the cylinder 3 misfire. These seem to be the common burnt valve symptoms. I pulled the ej25 motor out of the car and now I'm rebuilding the head. It was in good enough shape that having the Subaru head replaced wasn’t necessary. Unfortunately there is a lot of work involved with burnt valve repair. I had the ej25 head fixed at the machine shop and I install new valves. All the new valves are lapped into place and then I do a leak down test. Valve lapping takes a lot of patience. I also measure the valve lash and get that into spec.

[@stephaniec2478]

you have way more patience than I would have with this project. nice work, man!!!

[@aphex28]

Noice! Speed Academy engine build videos really helped me when I was in the same predicament. Although I do wish I had a video like this back in 2019 and I would have rebuilt my heads myself vs sending them to the machine shop(Although dang that was a lot of metal shavings coming out of there). You definitely went through it and and ended up going through a lot of the back and forth I would have. Keep on pushing through, you had such good patience and positivity to get it done!

[@victordeleon8412]

Yeah I guess the shavings are pretty typical. They only do a hot tank cleaning they don’t blow out the metal shavings at the machine shop. But it’s ok I would have done it anyway just to be sure there was no metal even if they blew it at the machine shop

[@nixter1618]

Much easier solution to the valve bucket clearance would be to install the bucket and measure clearance for each valve location. Take the difference of spec vs your measurement and you know how much to take off each valve. Great work though.

[@victordeleon8412]

Unfortunately without the special 800 bucket grinder there is no way to to accurately grind off the exact clearance needed in one pass and I don’t have a micrometer long enough to measure a vavle

[@nixter1618]

@@victordeleon8412 could use calipers to measure overall valve length and subtract amount needed. You found a way that works though. Great job at being creative!

[@victordeleon8412]

@@nixter1618 yeah probably would have been worth buying a large micrometer but I’m cheap and over budget on the rebuild 😂😂😂

[@nixter1618]

@@victordeleon8412 the story of all of us subie owners. Lol

[@bernana_wrx]

Damn, that valve grinding kit is sick

[@victordeleon8412]

Thanks dude it was a lot of work 🥵