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01-28-2018, 05:02 PM | #1 |
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Changing Timing and Crank Gear
I am installing a new aluminum timing gear and have the matching crank gear. Due to the difficulty involved in removing the crank gear I am wondering if it would be ok to leave the old crank gear. I have attached pictures of my existing gear. There is rust pitting in the teeth.
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01-28-2018, 05:31 PM | #2 |
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Re: Changing Timing and Crank Gear
That gear looks pretty rough and would probably eat up an aluminum gear. They can be hard to get off, heat and a big puller are usually needed. I'd recommend replacing it.
When installing the new gear, don't pound/hammer it on. Push it on. I use a squared up piece of pipe with a cap welded to the end and threaded for a crank bolt. Then use another bolt to press/push the new gear on. Heating the gear helps, just don't use as mush as you did to get the old one off. |
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01-28-2018, 06:17 PM | #3 |
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Re: Changing Timing and Crank Gear
Agree...Ernie
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01-28-2018, 06:29 PM | #4 |
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Re: Changing Timing and Crank Gear
I just did this a couple weeks ago on a Model T crank = same principle. I heated the new crank gear in our kitchen's oven @ 500 degrees for about 15 minutes. Using vise grips to carry the gear when heated, I rushed it down to the garage where the crankshaft was sitting in cold winter temperatures. Aligning the gear's slot with the woodruff key in the crankshaft, I slipped the gear over the end of the crank and pushed it home. It slid easily all the way down until it bottomed out. Easy as pie! A couple minutes later and the gear was unmovable. The combination of the heated gear (expanded metal) and the cold crankshaft (contracted metal) worked perfectly. Leave your garage unheated overnight before performing this procedure the next day so that the little extra bit that the cold crankshaft contracts will be just that much more helpful.
Marshall |
01-28-2018, 06:57 PM | #5 |
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Re: Changing Timing and Crank Gear
By the way, make sure you install the new steel crankshaft timing gear with the marked tooth for mating with the camshaft's timing gear indent/dimple facing OUT.
Marshall Last edited by Marshall V. Daut; 01-28-2018 at 06:58 PM. Reason: clarity rewording |
02-01-2018, 07:02 PM | #6 |
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Re: Changing Timing and Crank Gear
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02-01-2018, 07:26 PM | #7 |
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Re: Changing Timing and Crank Gear
Picture of engine raised up.
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02-01-2018, 07:39 PM | #8 |
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Re: Changing Timing and Crank Gear
Ed
If you need to you can remove the upper hand frank bearing that the u bolts go over by removing the 4 NRA below he spring plate and removing the upper plate. With the car on the ground it will sit there . Be careful if you are lifting the engine or using a jack underneath. I might suggest removing one of the engine mount bolts in the Rear to allow the rear to pivot without bind I have done many of these Larry Shepard |
02-01-2018, 07:53 PM | #9 |
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Re: Changing Timing and Crank Gear
Larry thanks for the information I have removed one bolt from each side and have loosen the other engine mount bolt. The engine pivots easy. I have read several times that model a ford springs you need to treat with respect.
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02-01-2018, 09:43 PM | #10 |
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Re: Changing Timing and Crank Gear
Hey Ed, the front spring is pretty safe.
It's the rear spring that can cause grief if the centre bolt breaks while disassembly. Good luck with your repair. Jeff
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02-02-2018, 12:29 PM | #11 |
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Re: Changing Timing and Crank Gear
Also, the snout of the crank is buggered up from using a pipe wrench on it. Dress the high spots down before pulling the gear or you might get stuck even tighter.
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02-02-2018, 02:08 PM | #12 |
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Re: Changing Timing and Crank Gear
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02-02-2018, 04:31 PM | #13 |
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Re: Changing Timing and Crank Gear
I figure some past mechanic.
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02-02-2018, 05:44 PM | #14 |
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Re: Changing Timing and Crank Gear
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02-03-2018, 07:52 AM | #15 |
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Re: Changing Timing and Crank Gear
Simple way to heat the gear. Lay the gear by the hole on the top of a 100 watt light bulb till it gets hot. It should go on easily with a little help from a hammer. Be aware, the key sticks out of the gear so, you will need a pipe with a notch or a piece of an old pulley to get it on for the last 3/16" or so. You can hammer the gear some if, you don't use an 8# sledge or hit it like you are breaking concrete.
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02-03-2018, 04:30 PM | #16 |
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Re: Changing Timing and Crank Gear
Picture showing how I pushed the crank gear onto the crankshaft. I heated the gear up with a Bernz O Matic torch using map gas. I held onto the gear with channel locks. The gear slid on quite ways with just hand pushing it. I used part of a 2 piece pulley and the old crank gear. I finished tighten it up with the impact gun. I have read about tighten down the timing gear nut from 60 to 100 foot pounds. It seems like a 100 would be way overkill as 60 sounds better. I was thinking just snugging it up with a impact gun on low setting. Would that be a bad idea. Thanks for all the input.
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02-03-2018, 04:33 PM | #17 |
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Re: Changing Timing and Crank Gear
A little more information I think the marks on the crank shaft is not from some one turning the engine over. With a closer inspection it looks maybe marks from a sharp chisel trying to raise some metal to tighten up a loose pulley.
Last edited by Ed Northrop; 02-03-2018 at 08:09 PM. |
02-04-2018, 02:47 AM | #18 |
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Re: Changing Timing and Crank Gear
Good job! Just did this last week. Crank gear was as bad. Pulled both bolts on each side, had to replace the rubber any way. As it was the motor mounts, one had crack and the other cracks and a piece missing.
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