Morgan Wright Posted February 3, 2016 Share Posted February 3, 2016 The whole job start to finish Link to comment Share on other sites More sharing options...
Morgan Wright Posted February 3, 2016 Share Posted February 3, 2016 Before rebuilding head:....................After (wet) ............dry.........wet1..........48..........90................................912..........31..........44................................703..........52..........65...............................1014..........45..........55................................855..........72..........86...............................1036..........74..........86...............................1077..........74..........81................................908..........65..........67.................................0 1 Link to comment Share on other sites More sharing options...
NC-car-guy Posted February 3, 2016 Share Posted February 3, 2016 Ummmm. Cylinder 8 is zero?? Link to comment Share on other sites More sharing options...
Morgan Wright Posted February 3, 2016 Share Posted February 3, 2016 Yup Link to comment Share on other sites More sharing options...
Grimy Posted February 3, 2016 Share Posted February 3, 2016 Highly unlikely that a #8 cam lobe went flat while the head was off (thank goodness!), so some inspection is required. Have you tried watching the movement of the #8 valves while engine is being cranked, and comparing distance traveled to the best cyl (#6)? Watching while engine is being manually turned would be even better. It's gotta be something in the head... Link to comment Share on other sites More sharing options...
Grimy Posted February 3, 2016 Share Posted February 3, 2016 Perhaps...* an incorrectly seated pushrod* a sticking valve in the guide* a not-correctly-seated valve spring retainer that's dragging on the stem Link to comment Share on other sites More sharing options...
avgwarhawk Posted February 3, 2016 Share Posted February 3, 2016 (edited) That is a revolting development. At 0 compression there has to be a huge hole in the piston, no rings or a valve staying open. Highly unlikely on the hole or completely missing piston rings. Major work on the head. This is the area to look. Edited February 3, 2016 by avgwarhawk (see edit history) Link to comment Share on other sites More sharing options...
NC-car-guy Posted February 3, 2016 Share Posted February 3, 2016 That is a revolting development. At 0 compression there has to be a huge hole in the piston, no rings or a valve staying open. Highly unlikely on the hole or completely missing piston rings. Major work on the head. This is the area to look. right, since he had compression before, but none after the heads are re installed, something is stuck.. Link to comment Share on other sites More sharing options...
Morgan Wright Posted February 3, 2016 Share Posted February 3, 2016 I did the compression test at 2 AM with a bottle of Wild Turkey. For cylinders 1 - 7, I was celebrating, especially the cylinders over 100. And 107!! That's good for a nice swig of turkey. But after I checked the last cylinder a few times I drank the rest of the bottle. 2 Link to comment Share on other sites More sharing options...
NC-car-guy Posted February 3, 2016 Share Posted February 3, 2016 oh dear Link to comment Share on other sites More sharing options...
avgwarhawk Posted February 3, 2016 Share Posted February 3, 2016 I did the compression test at 2 AM with a bottle of Wild Turkey. For cylinders 1 - 7, I was celebrating, especially the cylinders over 100. And 107!! That's good for a nice swig of turkey. But after I checked the last cylinder a few times I drank the rest of the bottle. Wonder if #8 received some of that Wild Turkey things would look much different? J/K. I suspect something wrong with the head on #8. Link to comment Share on other sites More sharing options...
Grimy Posted February 3, 2016 Share Posted February 3, 2016 If not the pushrods, there is indeed likely something wrong with the valve job. There *was* reasonable compression in #8 before removal, so I doubt it's the head itself. Perhaps check #8 compression again in the cold light of day, sans Wild Turkey... :-) Link to comment Share on other sites More sharing options...
DonMicheletti Posted February 3, 2016 Share Posted February 3, 2016 If the rocker arm assembly was disassembled and cleaned it is possible at least one of the rocker arms is in wrong. They are not all the same and must be oriented correctly. If not, the pushrod will rub the hole in the head and eventually break - a long shot. Zero compression screams "valve problem", Link to comment Share on other sites More sharing options...
old-tank Posted February 3, 2016 Share Posted February 3, 2016 Apply compressed air to that cylinder. You will soon find where the leak is: exhaust, intake, breather... 2 Link to comment Share on other sites More sharing options...
Morgan Wright Posted February 3, 2016 Share Posted February 3, 2016 With the valve cover off I can see the valves go up and down normally on 8 when I crank. How fragile are the pistons? What is the chance that I accidentally damaged a piston when I was putting the head on? I was being extremely careful to put the head on straight, and not to touch the pistons, because I had set the engine to top dead center so the tops of pistons 1 and 8 were sticking up. Putting the head on is a delicate task, I was trying not to damage or crimp the head gasket, but the damn head is so heavy there is a certain amount of jockeying around that you have to do. I was using a system of rubber cushions to jockey the head into position but I may have cracked #8 piston, they are aluminum and pretty fragile I guess. Note: I was NOT drinking Wild Turkey the day I put the head on. That is a job for sober people only. Link to comment Share on other sites More sharing options...
NC-car-guy Posted February 3, 2016 Share Posted February 3, 2016 are they going all the way up and down? Could there be something caught in the valve? I would try compressed air like Willie suggested before you pull it all apart again Link to comment Share on other sites More sharing options...
Morgan Wright Posted February 3, 2016 Share Posted February 3, 2016 OK here is the deal. When they regrind the seats they remove metal which increases the amount that the valve has to go up to close. If the old rocker arm valve adjustment was already tight, the new position of the valve might be so high that the rocker arm is not allowing the valve to go up all the way and close. I will back off the screw a couple turns on each rocker arm on 8 and see it that is the problem. Duh! You think maybe I'd do a valve adjustment on a rebuilt head!! Link to comment Share on other sites More sharing options...
avgwarhawk Posted February 3, 2016 Share Posted February 3, 2016 Duh! You think maybe I'd do a valve adjustment on a rebuilt head!! Well..... 1 Link to comment Share on other sites More sharing options...
Morgan Wright Posted February 3, 2016 Share Posted February 3, 2016 (edited) Ok I rough-adjusted the valves using the rocker arm jiggle test. New compression measurements: Before rebuilding head:....................After (wet).........................after the jiggle test (wet) ............dry.........wet1..........48..........90................................91................................1122..........31..........44................................70................................1123..........52..........65...............................101...............................1024..........45..........55................................85..................................975..........72..........86...............................103...............................1106..........74..........86...............................107...............................1077..........74..........81................................90................................1078..........65..........67.................................0.................................105 I did the jiggle test one valve at a time by cranking the engine and waiting for the valve to be in the middle of its open period, grab the rocker arm, and it should jiggle just a little. If it doesn't jiggle it means it's under pressure and probably not closed all the way. If there is too much jiggle tighten it until it just jiggles. 2 intake was way too tight. Had to loosen the screw 180 degrees to get a jiggle. compression jumped from 70 to 1125 intake took 90 degrees to jiggle, compression went up from 103 to 1106 exhaust was too loose, tightened it, no change in compression7 intake only took 45 degrees turn of screwdriver but compression went from 90 to 1078 intake took 3 turns of 180 degrees to get a jiggle8 exhaust took 2 turns of 180. Look at cylinder 8 now!! All other valves passed the jiggle test. Edited February 6, 2016 by Morgan Wright (see edit history) 1 Link to comment Share on other sites More sharing options...
avgwarhawk Posted February 3, 2016 Share Posted February 3, 2016 Fantastic!!!! 1 Link to comment Share on other sites More sharing options...
Morgan Wright Posted February 3, 2016 Share Posted February 3, 2016 Needless to say, I'm going to get another bottle of Wild Turkey to celebrate!!!!!!! Link to comment Share on other sites More sharing options...
Grimy Posted February 3, 2016 Share Posted February 3, 2016 And a feeler gauge, I hope! :-) Link to comment Share on other sites More sharing options...
Morgan Wright Posted February 3, 2016 Share Posted February 3, 2016 And a feeler gauge, I hope! :-)I have one of those, but I'll do the valve lash when the car is running. That might be this weekend! All I have to do now is connect the fuel line and start it! Link to comment Share on other sites More sharing options...
NC-car-guy Posted February 3, 2016 Share Posted February 3, 2016 Sweet!!! Link to comment Share on other sites More sharing options...
Buicknutty Posted February 5, 2016 Share Posted February 5, 2016 Nice! Link to comment Share on other sites More sharing options...
Morgan Wright Posted February 6, 2016 Share Posted February 6, 2016 The good news doesn't stop coming. I just redid the jiggle test on #7 and it's 107 now. I'm going back to edit the post. 1 Link to comment Share on other sites More sharing options...
Morgan Wright Posted February 6, 2016 Share Posted February 6, 2016 I can't leave well enough alone. I didn't like 1 being 90 and 4 being 85 so I went and adjusted the jiggle on them a little more. Now 1 is 112 and 4 is 97. Final results: Before rebuilding head:....................After 1................90....................................1122................44....................................1123................65....................................1024................55......................................975................86....................................1106................86....................................1077................81....................................1078................67....................................105 1 Link to comment Share on other sites More sharing options...
NC-car-guy Posted February 6, 2016 Share Posted February 6, 2016 Awesome Link to comment Share on other sites More sharing options...
smithbrother Posted February 6, 2016 Share Posted February 6, 2016 Now you need to HOPE the rods and mains stand up to the change in the compression. I haven't read the entire thread, so maybe you have addressed that. I recall in the mid/late 40's when new cars were flying out the door, but some folks just couldn't afford a new one. Many requested just a valve job, only to find a few weeks later the bearings were in trouble. Dad always warned them of the added compression, and what it could do to bearings. I wish you well, Dale in Indy 1 Link to comment Share on other sites More sharing options...
Morgan Wright Posted February 7, 2016 Share Posted February 7, 2016 Good call. If I drive like an old grandmother we won't need to worry about the bearings. Link to comment Share on other sites More sharing options...
smithbrother Posted February 7, 2016 Share Posted February 7, 2016 Yep, RPM is a key factor.I'm sure you have that under control.Dale in Indy 1 Link to comment Share on other sites More sharing options...
Morgan Wright Posted February 7, 2016 Share Posted February 7, 2016 https://youtu.be/nang5aznjf4 Video of rebuilt head. I'll pull the car outside and start it now. Link to comment Share on other sites More sharing options...
Buicknutty Posted February 7, 2016 Share Posted February 7, 2016 Cool, Morgan. I'm really looking forward to the one of it running! Great progress! Keith 1 Link to comment Share on other sites More sharing options...
Morgan Wright Posted February 7, 2016 Share Posted February 7, 2016 (edited) https://www.youtube.com/edit?o=U&video_id=VpqHGIITcwM Edited May 9, 2017 by Morgan Wright (see edit history) 2 Link to comment Share on other sites More sharing options...
Morgan Wright Posted February 7, 2016 Share Posted February 7, 2016 (edited) . Edited May 9, 2017 by Morgan Wright bad link (see edit history) 3 Link to comment Share on other sites More sharing options...
Ben Bruce aka First Born Posted February 7, 2016 Share Posted February 7, 2016 Great, Morgan. She is ALIVE. Ben 1 Link to comment Share on other sites More sharing options...
avgwarhawk Posted February 8, 2016 Share Posted February 8, 2016 That is awesome! Link to comment Share on other sites More sharing options...
JohnD1956 Posted February 8, 2016 Share Posted February 8, 2016 Just wait till the engine gets warm enough for the choke to open. Of course from my view, I'd have opened the choke a little more as soon as it started. Also wondering if you installed exhaust manifold gasket of some sort. Kinda looks like an exhaust leak at the front and rear exhaust ports. 1 Link to comment Share on other sites More sharing options...
Morgan Wright Posted February 9, 2016 Share Posted February 9, 2016 Also wondering if you installed exhaust manifold gasket of some sort. Kinda looks like an exhaust leak at the front and rear exhaust ports. Yep, got manifold gaskets, intake and exhaust. No leak, it was just smoke from the oil. Link to comment Share on other sites More sharing options...
Buicknutty Posted February 10, 2016 Share Posted February 10, 2016 Morgan, I'm just getting caught up on your most recent work. That is trully awesome to see it start up and run so well. Congrats! Keith 1 Link to comment Share on other sites More sharing options...
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