Crankshaft Timing Gear Installation? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 03-03-2008, 09:50 AM
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Crankshaft Timing Gear Installation?

I need some advice on the installation of the timing gear onto the crankshaft.

The engine is an '86 Chevy 454 truck motor. The timing set is a Cloyes true roller set. My cam is a Comp 280H and will be installed at 4 degrees advance (spec from Comp).

Problem is mashing the gear onto the crank.
My shop manual (either the 67 or the 71 Chevy service manual) specifies using a tool to press the gear onto the crankshaft over the key). Finding these 40 year old chevy service tools is near impossible. My preliminary search for an aftermarket tool only yields the balancer install tool.

As an alternative to finding and purchasing the correct tool, I am considering the time honored method of heating the gear with a torch and putting the gear on by hand (using welding gloves). Also, if I do this, I assume that it is best to tap the key into the slot on the crank before tryin to put the heated gear on. My son has done this with two of his rice burner motors and been sucessful.

What do you think? Torch or Tool? Any ideas, suggestions, or leads to acquire the correct tool would be appreciated.

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Old 03-03-2008, 10:12 AM
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Step one: install the appropriate key with Loctite 660 (or nothing if it fits snugly enough)

Step two: find a piece of tubing that is big enough to fit over the snout of the BBC crank

Step three: slide the crank gear on until it gets tight

step four: using the piece of tube and a hammer seat the gear the rest of the way onto the crank
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Old 03-03-2008, 10:28 AM
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Quote:
Originally Posted by Double_v23
Step one: install the appropriate key with Loctite 660 (or nothing if it fits snugly enough)

Step two: find a piece of tubing that is big enough to fit over the snout of the BBC crank

Step three: slide the crank gear on until it gets tight

step four: using the piece of tube and a hammer seat the gear the rest of the way onto the crank
Hopefully while the crank is out of the block.

Vince
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Old 03-03-2008, 10:36 AM
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You can imitate the special gear installer tool with a balancer installer and a tube that will slip over the crank snout.
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Old 03-03-2008, 10:40 AM
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Crank is installed

I thought of that after I already had the crank et al installed.

The book sequence results in installation of the timing gear after all the short block work is done.
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Old 03-03-2008, 10:48 AM
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Imitation Tool

Elliot,

I am working on that. Picking one of the longer balancer tools from summit, I would have the correct 1/2-20 bolt with a thrust washer, adding from my ball joint set I would have a good cap to push the tube.

I am not sure of what to use for a tube. I've looked at several of the axle nut sockets, but none seem just right (diameter, length, fitting the 1/2" bolt through).

If I go to buy some tubing (I'm a one car garage type), I'm not sure what to use. Exhaust pipe, emt conduit, steel?
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Old 03-03-2008, 11:05 AM
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Last time I did it, it didn't take a whole lot of pressure to put it on, I used a piece of scrap PVC I had laying around, but that probably won't work in every instance.
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Old 03-03-2008, 11:12 AM
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It usually doesn't take much to force to get them on there (as long as it is straight when you start it) so this will work with the short block assembled as well.
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Old 03-03-2008, 11:14 AM
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What I use is a piece of square stock that has an inside dimension just larger than the snout diameter and long enough to ensure the gear is seated. The ends of the tubing are milled square. I then press it on with my balancer installer. By using square stock I find that there's clearance for the key and it still contacts the gear and my installation tool.
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Old 03-03-2008, 11:17 AM
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PVC Tool?

Elliott,

I wouldn't have thought PVC is strong enough, but the price is right. I'll give it a try.
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Old 03-03-2008, 11:22 AM
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I think as long as the cuts are nice and straight and contact with the gear and thrust bearing are nice and even, it shouldn't be an issue. I just used it because it was laying around, I wouldn't recommend it if you do a lot of installs, but for a one time use, it should be OK.
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Old 03-03-2008, 11:34 AM
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Old dogs - New tricks

Elliott,

It's hard to learn new tricks when your an old dog ( like me), but I believe in giving credit where credit is due. I think your idea is a good one and I'm going to try it.

I've hammered a bunch of these on and never knew if I damaged the bearings or not (those motors ran and drove long enough). But this is my first big block, it's been VERY expensive, plus I have the time to do things right (project vs repair), so I am taking my time and learning as I go.

For everyone else, I appreciate your interest and valuable input.
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Old 03-03-2008, 11:56 AM
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Yeah I have done this on big and small blocks, As long as you don't get crazy it is not a big deal, it is not like I am winding up with a two pound sledge, just a little tap tap tappy.

THe crank and rotating assembly abosorbs most if not all of what little impact there is, so by the time you get to the thrust bearing it doesn't even really move. If you were concerned though you could always recheck your crankshaft endplay, I have done this and it never changed. (at least as far as I could tell on a 0-.1000 dial indicator.
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