by jerry_hoback » Wed Mar 12, 2025 11:24 pm
I did finally get the last 3 studs out using heat, Kroil, and a big visegrips low down just above the lower threads. I was initially very leery of using uneven heat right next to the cylinders like that, but no apparent harm was done.
At this point head is back on, cams are mounted, tappet guides checked for gap and reshimmed as needed (3 pairs appeared to have simply been swapped). I believe that the problem valve where the low compression existed was because of a too- thick shim. The valve does not appear bent or damaged but there is evidence of some activity in that area, including the cam timing not agreeing with the crank timing and the shims mixed up. (It seems like every time I fix a problem in the engine bay, I end up wondering why this car ran when I got it.)
I am at the point of setting the cams timing to agree with the cranks' TDC mark. There appears to be about 5 degree disagreement. I have read the shop manual, and maybe my Queens English is lacking (I wouldnt be surprised) but I dont understand how to remove the adjustment plates from the cam sprocket gears. I have the clips out. I found a pair of nuts to put on the guide pins to hold the assemblies off the cams, and tapped- as the manual stated- on the sprocket to try to knock it off the plate but no luck. I was contemplating sliding some sort of shim between the front of the cam and the plate, but am worried that whatever it might be would fall into the abyss below. As it is I tried Kroil there too, along with a bit of heat, but I am essentially ending up hammering against that front guide plate via the nuts I have on the guide pins. I also read another thread here which stated that to install them, the plate and sprocket must be square with each other or they will bind. I suspect this may be my problem but it seems like a special puller would be needed to overcome it. Thoughts?
Thanks guys!
I did finally get the last 3 studs out using heat, Kroil, and a big visegrips low down just above the lower threads. I was initially very leery of using uneven heat right next to the cylinders like that, but no apparent harm was done.
At this point head is back on, cams are mounted, tappet guides checked for gap and reshimmed as needed (3 pairs appeared to have simply been swapped). I believe that the problem valve where the low compression existed was because of a too- thick shim. The valve does not appear bent or damaged but there is evidence of some activity in that area, including the cam timing not agreeing with the crank timing and the shims mixed up. (It seems like every time I fix a problem in the engine bay, I end up wondering why this car ran when I got it.)
I am at the point of setting the cams timing to agree with the cranks' TDC mark. There appears to be about 5 degree disagreement. I have read the shop manual, and maybe my Queens English is lacking (I wouldnt be surprised) but I dont understand how to remove the adjustment plates from the cam sprocket gears. I have the clips out. I found a pair of nuts to put on the guide pins to hold the assemblies off the cams, and tapped- as the manual stated- on the sprocket to try to knock it off the plate but no luck. I was contemplating sliding some sort of shim between the front of the cam and the plate, but am worried that whatever it might be would fall into the abyss below. As it is I tried Kroil there too, along with a bit of heat, but I am essentially ending up hammering against that front guide plate via the nuts I have on the guide pins. I also read another thread here which stated that to install them, the plate and sprocket must be square with each other or they will bind. I suspect this may be my problem but it seems like a special puller would be needed to overcome it. Thoughts?
Thanks guys!