Hi Everyone,
I wanted to get your opinion on my recent experience. I sent in some heads off a EJ205 subaru engine (DOHC) to get a valve job done and supplied new OEM valves. After the job was complete, I installed the heads on the the short block which is still on the engine stand and ran a leak down test. My target pressure was 70 PSI but I had no expectation of reaching that pressure as with a good seal, the pressure should start pushing the piston down from TDC and I would have to hold the crankshaft stationary.
I was disappointed to discover that 3 of the 4 cylinders exhibited 60% leakage while one cylinder held pressure to the point where I could no longer hold the crankshaft stationary. I brought the heads back to the machine shop to have them take a look and their claim was that everything looked good. I was told that after I run the engine, everything would seal back up and I would have no issues.
I'm a little hesitant to do this because it's a lot of work to put the engine in and pull it out if there are issues. Also, the fact that one cylinder passed the leakdown test while the other failed is reason for my skepticism.
What are your opinions on this? Just install them and run them? Or if the leak now, they'll leak after they're run?
Thanks!
I wanted to get your opinion on my recent experience. I sent in some heads off a EJ205 subaru engine (DOHC) to get a valve job done and supplied new OEM valves. After the job was complete, I installed the heads on the the short block which is still on the engine stand and ran a leak down test. My target pressure was 70 PSI but I had no expectation of reaching that pressure as with a good seal, the pressure should start pushing the piston down from TDC and I would have to hold the crankshaft stationary.
I was disappointed to discover that 3 of the 4 cylinders exhibited 60% leakage while one cylinder held pressure to the point where I could no longer hold the crankshaft stationary. I brought the heads back to the machine shop to have them take a look and their claim was that everything looked good. I was told that after I run the engine, everything would seal back up and I would have no issues.
I'm a little hesitant to do this because it's a lot of work to put the engine in and pull it out if there are issues. Also, the fact that one cylinder passed the leakdown test while the other failed is reason for my skepticism.
What are your opinions on this? Just install them and run them? Or if the leak now, they'll leak after they're run?
Thanks!