robrob Posted February 5, 2015 Report Share Posted February 5, 2015 Hi, my name is Rob. I own a 74 620 and im running a u20 cam w53 head on an l16 with twin hitachi w38 flat tops and a k14 manifold. My truck has been running crappie lately so I decided to replace the old points distributor with anew d4k match box. i went to put my motor to tdc with the valve cover off and noticed that the cam gear wasn't in line with the notch. Here's the fun part, when I turn the motor, via the fan the cam gear moves independent of the cam This is a running motor and every thing is thight. Could the pin on the cam have broken some how? Quote Link to comment
flatcat19 Posted February 5, 2015 Report Share Posted February 5, 2015 Had to have. Or just fallen out altogether. Spin around till you find dowel pin hole. What I would be more scared of is...Where did the dowel end up? 1 Quote Link to comment
flatcat19 Posted February 5, 2015 Report Share Posted February 5, 2015 I guess you could tap the cam to take a bolt to secure the cam gear. Doesn't sound entirely shady. I'd do it. Quote Link to comment
Stoffregen Motorsports Posted February 5, 2015 Report Share Posted February 5, 2015 I've seen broken cams before in motors that still ran. If everything is tight, then the cam (obviously) should not spin independent of the cam gear. Quote Link to comment
flatcat19 Posted February 5, 2015 Report Share Posted February 5, 2015 In theory, yes. Better safe than sorry with added piece of mind having something more than just the bolt, right? 1 Quote Link to comment
robrob Posted February 5, 2015 Author Report Share Posted February 5, 2015 Thanks guys I just pulled it and put a different cam in... it wasn't broke the pin was bent and it was casing slop in the geat Quote Link to comment
robrob Posted February 5, 2015 Author Report Share Posted February 5, 2015 I did get the distributor in but I had to wire it differently from what I've seen on here. Black and white to the + side of the coil and C to the + and B to the -side of the coil Quote Link to comment
banzai510(hainz) Posted February 5, 2015 Report Share Posted February 5, 2015 hope you use a EI coil as the point one will burn up if not using the ballst resisitor. C to the + and B to the -side of the coil ??????????????? B is + C is -side coil what I know of But if it works for you . as for cam gear I seen where the holes are slighly larger(OSK set) than the dowl which will give a little movement Quote Link to comment
robrob Posted February 5, 2015 Author Report Share Posted February 5, 2015 I got the coil for a 79 620.... Having some trouble getting this thing to idol smooth though.. It dose have a miss but now all my ignition components are new. At one time the carbs were set good. Could I have a bad valve ? I will check the valve lash after work. How can I check if thevalves are seating right without removing the intake or head? Quote Link to comment
banzai510(hainz) Posted February 5, 2015 Report Share Posted February 5, 2015 what I do is pop the valve cover and what ever cam lobe is up see if it wiggles then you know the valve is closing. then ck the others then move the cam clock wise till the next lobe is up then ck that one this don't ck if the seat poped loose or the valve has a crack and looses compression. maybe you you go to habe B on +12volts and C to - side of coil? Quote Link to comment
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