impostor Posted June 14, 2016 Share Posted June 14, 2016 So recently I picked up a nice 86 XT GL-10 that is nearly perfect but is leaking oil everywhere. I decided to do a shortblock out reseal. When tearing down the lh head I noticed the cylinder 4 exhaust valve is bent towards the top of the stem. It also looks like a few guides have dropped slightly. I was just wondering how common this is. In all the Subarus I've rebuilt I've never seen a valve bend at this spot. Also, amazingly, the rh head has no cracks between the valves. The lh head looks like a normal ea82 head. Quote Link to comment Share on other sites More sharing options...
skishop69 Posted June 14, 2016 Share Posted June 14, 2016 Never in 20 years seen a bent valve on an EA81 or 82. Never even heard of it unless someone dropped something down the intake. Quote Link to comment Share on other sites More sharing options...
jono Posted June 14, 2016 Share Posted June 14, 2016 I have heard of just one EA82T with a contact between valve and piston causing some bend after a timing belt slip or break. Yours makes the second out of three forums. Can you post up a pic of the removed valve? I have had one head in need of a new valve guide as the valve stem had worn enough tp allow a3mm ? sideways movement in the head and cause a mystery performance problem. Fixed with a K-line insert and in my current EA82Mongrel. I am wondering if you guide is nice and round inside to allow its angle and interference change, or just the guide slipped in to allow this - me thinks. Quote Link to comment Share on other sites More sharing options...
impostor Posted June 15, 2016 Author Share Posted June 15, 2016 Its really hard to tell by looking at it that it is bent. It does have a shiny spot where it was rubbing. It was difficult to remove from the head and when I spun it in a lathe it was pretty obvious where the bend was. I'll try to get a pic in the next few days. Quote Link to comment Share on other sites More sharing options...
skishop69 Posted June 15, 2016 Share Posted June 15, 2016 I don't mean to start a tiff here, but based on deck height, piston height, TDC height and valve protrusion, it is impossible for the valve to contact the piston on an EA82 engine. Just for s&g, I took a bore scope to my XT when I rebuilt it and the clearance with the valve open and piston at TDC is huge in terms of interference specs. The only way I could see it happening is if the block or heads were shaved and the rod stretched. Any valve that is bent by piston contact is going to leave a mark on both especially if the pistons do not have valve reliefs cut/cast into them. Quote Link to comment Share on other sites More sharing options...
impostor Posted June 17, 2016 Author Share Posted June 17, 2016 Thats what is wierd about it. This wasn't valve to piston contact. Quote Link to comment Share on other sites More sharing options...
idosubaru Posted June 18, 2016 Share Posted June 18, 2016 I was thinking the same thing. any signs or knowledge of prior engine work? Sounds like maybe this thing wasnt maintained well or driven hard? Heads shaved a ton? Lol Quote Link to comment Share on other sites More sharing options...
Uberoo Posted June 18, 2016 Share Posted June 18, 2016 (edited) A bent valve is possible with some water ingestion at low engine speeds. Edited June 18, 2016 by Uberoo Quote Link to comment Share on other sites More sharing options...
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