Joe Flanagan Posted February 26, 2011 Report Posted February 26, 2011 I'm replacing my timing gears. The old crankshaft gear was very hard to get off with a puller. The new one won't go on without a good deal of pounding, which I don't want to do. I checked the fit of the old one and it, too, would be so tight to reinstall that I'd have to use a lot of force to get it on. It's not the key holding it up because I tried both old and new gears with the key out. I read in a recent thread that this is supposed to slip on, so what do you suppose is the problem? Quote
Don Coatney Posted February 26, 2011 Report Posted February 26, 2011 Do not use a hammer to pound the gear into place! Get some fine emery cloth and dress both the front of the crankshaft wher the gear goes and the internal bore of the gear. It sounds as if you have a slight burr. It may take some time to dress this for fit but it is time well spent. Quote
RobertKB Posted February 26, 2011 Report Posted February 26, 2011 Heat the gear in the oven? This would increase the size of the internal bore and it might slip on easily. I don't think it would harm the gear but am not positive. I would only try this after Don's suggestion as his makes sense and certainly should be tried first. I doubt very much it would just slip on as you mentioned as this could lead to excess play. I believe it should be a pressed fit. The key is more of a safety factor to stop the possiblilty of the gear slipping. Maybe others can chime in as I could be way off base with my suggestion. 1 Quote
aero3113 Posted February 26, 2011 Report Posted February 26, 2011 When I put mine on I tapped it on with a block of wood. It did not slide on easy but it did go on smoothly with some tapping. Quote
aero3113 Posted February 26, 2011 Report Posted February 26, 2011 I want to add that my crank was out of the engine when I did this. Quote
Dodgeb4ya Posted February 26, 2011 Report Posted February 26, 2011 (edited) These crank gears are a fairly tight press fit onto the crankshaft. Check for burrs and do what Don said. You could make up press tube to push the gear on using a real thick large diameter washer put on the crank nut and forcing the gear on after de-burring it first. Pounding the gear or hub puts a lot of force against the rear main bearing thrust surface. Hammer Pounding could damage the main bearing and also roll over the front pulley flange hub bore. I have a special tool to remove and pess them on the old flatheads-have done a lot of them. Bob Edited February 26, 2011 by Dodgeb4ya Quote
greg g Posted February 26, 2011 Report Posted February 26, 2011 put it in the oven at 375 or 400. I did, then tapped it on with a plastic hammer. Quote
Joe Flanagan Posted February 26, 2011 Author Report Posted February 26, 2011 Got it. Emory cloth and light tapping. Thanks, everyone. Quote
greg g Posted February 26, 2011 Report Posted February 26, 2011 I think I may have used the big crank nut socket also to tap it on also. Quote
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