MilesFox Posted October 9, 2005 Share Posted October 9, 2005 ok we have this 87 carb'd gl wagon that came missing a valve spring. looks like a keeper fell out(?somehow) the cam tower was still on. this car came from someone who claimed it had a "broken timing chain and 2 bent valves" replaced the spring and keeper. the lash adjuster was found apart and put back together runs and drives and no compression on #1 cylinder take cam tower off and pull head. mock up head and cam tower and exhaust valve is slightly open on the #1 cylinder. note was taken the lash adjuster was taller than the other, because the cap was not on all the way, that was fixed and the head put back on still no compression on #1 cyl. what is the problem and how do you bend valves on subarus??? the valve seats closed when the head is by itself and no cam tower and rockers installed. Link to comment Share on other sites More sharing options...
TomRhere Posted October 9, 2005 Share Posted October 9, 2005 Most valves bend at the head/stem area due to contact with the piston. Have seen a few that were bent on the stem itself, real bear to remove from guide by the way when that happens. If the valve seated against the seat when the head was sitting alone, I wouldn't think that it would be bent. Usually quite obvious that something is wrong when a bent valve is against the seat. My theory on sequence of events here. HLA stuck in the colasped position (momentarily) allowing rocker to fall off. Rocker fell against valve spring, and cam lobe caught it collaspsing the spring enough to allow keepers to fall out. HLA, now free of being held by the rocker, was pushed apart by the oil pressure, (could be pushing that one abit though??). Wonder if maybe the rocker is bent or malformed enough to hold valve off it's seat when everything is where it should be. Or maybe there's something in bore for the HLA?? This that Wagon that Jim just bought?? Link to comment Share on other sites More sharing options...
86subaru Posted October 9, 2005 Share Posted October 9, 2005 yes it is the wagon i just got , i do have a spare motor parts with good valves,seems like the alt needs replaced also Link to comment Share on other sites More sharing options...
nipper Posted October 9, 2005 Share Posted October 9, 2005 Most valves bend at the head/stem area due to contact with the piston. Have seen a few that were bent on the stem itself, real bear to remove from guide by the way when that happens. If the valve seated against the seat when the head was sitting alone, I wouldn't think that it would be bent. Usually quite obvious that something is wrong when a bent valve is against the seat. My theory on sequence of events here. HLA stuck in the colasped position (momentarily) allowing rocker to fall off. Rocker fell against valve spring, and cam lobe caught it collaspsing the spring enough to allow keepers to fall out. HLA, now free of being held by the rocker, was pushed apart by the oil pressure, (could be pushing that one abit though??). Wonder if maybe the rocker is bent or malformed enough to hold valve off it's seat when everything is where it should be. Or maybe there's something in bore for the HLA?? This that Wagon that Jim just bought?? i agree witht he theory. Make sure the valve isnt burnt, or has carbon holding it open. nipper Link to comment Share on other sites More sharing options...
86subaru Posted October 9, 2005 Share Posted October 9, 2005 could the slack adjusters freeze up , if so how to fix ? Link to comment Share on other sites More sharing options...
MilesFox Posted October 9, 2005 Author Share Posted October 9, 2005 interesting theory, tom. the outer spring and spring keeper were in a parts tray, the cam tower was still on the head, i dont know why anyone would try to remove a valve under the cam tower before removing it there are score marks on the inside of the cam tower housing the round part that retains the spring had a notch worn out of the outer circumfrence. the iner part where the tip of the valve stem comes through was wallowed out on one side, this must be the side that dropped a keeper now, the valve moved back and forth freely before another spring and keepers were installed. went right together now what you say about the lash adjuster is interesting. the part that holds the lash adjuster was missing and i used one from anothr adjuster that was stuck in its head off another motor would there be a difference in HLA's between years such ad 85-85 vs. 87-94? there was no excessive carbon build up. the valve seats were fine and the cracks between the valves were minimal the motor has 85,000 original miles something interesting i noticed is the bottom half of the circumfrene of the pstons were shiny suggesting water, and there was a water spot on the #1 cylinder but i would attribute this to weather and the car sitting. the head gasket looked fine and came off on one side and remained to the block in all its surface Link to comment Share on other sites More sharing options...
86subaru Posted October 9, 2005 Share Posted October 9, 2005 bump bump Link to comment Share on other sites More sharing options...
torxxx Posted October 9, 2005 Share Posted October 9, 2005 Miles - I ran into this problem last winter. Some kid cold started his car, rev'd the crap out of it and popped a valve like you've listed. Exact same deal. I ended up having to scrap the motor because the valve put a crack in the top of the piston, bent the hell out of the valve and messed the guide up. I got a new straight valve and it wouldnt go into the guide at all. You sure that "water" mark on the piston isnt a valve mark from the valve hittin the piston when it was TDC? Link to comment Share on other sites More sharing options...
86subaru Posted October 9, 2005 Share Posted October 9, 2005 while changing the fuel filter i broke the brake line , i must have hit the line some how, Link to comment Share on other sites More sharing options...
TomRhere Posted October 10, 2005 Share Posted October 10, 2005 (quote) would there be a difference in HLA's between years such ad 85-85 vs. 87-94? I remember someone posting a pic on here of 2 differently shaped HLA's, but do believe the over-all length should be the same. (quote) the outer spring and spring keeper were in a parts tray, the cam tower was still on the head, i dont know why anyone would try to remove a valve under the cam tower before removing it there are score marks on the inside of the cam tower housing the round part that retains the spring had a notch worn out of the outer circumfrence. the iner part where the tip of the valve stem comes through was wallowed out on one side, this must be the side that dropped a keeper Hmmm. Maybe rocker did fall out, and PO tried to fix it, but waited to long in doing so, thus the worn parts. Did the score marks look like they were made by engine parts, or by someone using tools? I've only tore-down 1 EA-82 engine, but don't think I would attempt to do valve work with head still on engine, myself. Been long enough since I did so, that I'm having trouble getting a mental pic of everything, going here. When you re-assembled everything, did you use a different rocker, or the same one from this engine? Reason I ask is, maybe it is bent/deformed like I said before. It's about the only thing I can think of right now that would hold valve open when things are assembled. Thinking I would swap the entire head/cam carrier/whatnots from the spare engine at this point. Link to comment Share on other sites More sharing options...
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