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Original Message
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| Pulling head will give you some insite |
| By mcj67 - 01/26/2001 8:20:49 PM; IP 12.78.135.51 |
| Hello Schu, Did you try squirting a little oil into #5 & #6 sparkplug holes and rechecking the compression, this will tell you if the rings are the problem( make sure the throttle and choke are wide open when checking the compression) I am sure that you have checked the valve adjustment, do you have adjustable rockers ,even with hyd. system it may have tightend up some since you built the engine, or it could be some bad lifters, Steves book tells how to check all that stuff. You may have gotten hold of a couple of the wrong lenth push rods,if the valve lash is just a little to tight this would cause low compression.(the valves don't quite close all the way) As for the head, since it has not been that long ago that you rebuilt the engine it should not be all that hard to pull it ( no locked up exhaust bolts ect.) and if you don't mind putting in the time and effort,I would pull it. At the very least it would rule out certian things. Since the two cylinders that are reading low are next to each other #5 & #6 you could have a blown head gasket between these two cylinders, and it does not take long for a leak in this area to start removing material from the head, and worse yet the block. This would also give you a chance to check the cylinder bore for scraches, measure the bore to see if it has washed out, and check out the valves, seats, gides, and the springs. If you do pull it let me know what you find. Have you been able to determin if the black residue on #5 & #6 spark plugs is oil or fuel? I found the reply you got on the FE forum about the power valve in the carb. interesting, I can see where it would make a car run poorly and cause certian sparkplugs to soot up . But since you have low compression I think there is more to it. Keep us informed, you will get it sooner or later. Good Luck Mike Jones |
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