BoostedBoxer421 Posted November 17, 2014 Share Posted November 17, 2014 I have a 1985 ford f250 with a 300 bored .60 over and the timing marks on the harmonic balancer do not relate to TDC on the number 1 cylinder. The marks are aligned with TDC on number 5. How can this be? Link to comment Share on other sites More sharing options...
john in KY Posted November 17, 2014 Share Posted November 17, 2014 Balancer has sheared the woodruff key and has spun on the crankshaft? Link to comment Share on other sites More sharing options...
El Presidente Posted November 17, 2014 Share Posted November 17, 2014 Is that the stock balancer that came with the engine? I can't remember, but I think SBF balancers will fit on the big 6 engines. Does TDC on #5 sit exactly at 0 on the timing marks? Has the outer ring separated from the rubber and rotated? Josh Link to comment Share on other sites More sharing options...
BoostedBoxer421 Posted November 17, 2014 Author Share Posted November 17, 2014 Is that the stock balancer that came with the engine? I can't remember, but I think SBF balancers will fit on the big 6 engines. Does TDC on #5 sit exactly at 0 on the timing marks? Has the outer ring separated from the rubber and rotated? Josh yes, TDC goes to the #5 cylinder Link to comment Share on other sites More sharing options...
BoostedBoxer421 Posted November 17, 2014 Author Share Posted November 17, 2014 the key is still good, the engine ran great before the computer went out Link to comment Share on other sites More sharing options...
john in KY Posted November 18, 2014 Share Posted November 18, 2014 (edited) "the timing marks on the harmonic balancer do not relate to TDC on the number 1 cylinder" I'm confused. Are you saying that when you bring #1 cylinder up to TDC, the pointer doesn't point at 0 degrees? The firing order is 142 536. Seems to me the only problem is the plug wires are 180 degrees off. I would retime the engine by bringing #1 up to TDC. The timing marks on the balancer should be at 0. Then reinstall the plug wires. Edit from another forum: Ford in there infant wisdom saw fit to put 2 different sets on many of the 4.9s. on mine there is one set on the timing gear cover. dont use this one if you have the other one it is located on the other side or passenger side. it is a metal strip that has notches in it. one big notch which is TDC and smaller notches going both ways out from TDC . there are also 2 different marks on the crank pulley. one square notch that is easy to see. dont use this one. the other correct one is a very small line scribed in the pulley and very hard to see if the pulley is dirty. this is the one to use. Edited November 18, 2014 by john in KY Link to comment Share on other sites More sharing options...
spazomatic Posted November 18, 2014 Share Posted November 18, 2014 How sure are you that it is the correct balancer? And look for clues that the outer ring may have spun. Look for a lot of cracks, missing pieces, or bulges on the rubber isolator. If all else fails, dont worry about it. I time my engines with my spidey senses, and if i use a timing light, its for curiosity sake or for documentation. Link to comment Share on other sites More sharing options...
BoostedBoxer421 Posted November 19, 2014 Author Share Posted November 19, 2014 With the number one piston on TDC with valves closed. Either mark is about 45degrees off from either side timing references. If you rotate the thin line mark scribed on the balancer then it is number 5 cylinder on TDC. Link to comment Share on other sites More sharing options...
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