crankshaft gear removal

[eckoxl]

I cannot for the life of me get this crankshaft gear off. It is in the block so I need to find a way to get this one off and put the new one on without damaging anything. Anyone have any ideas? I'm going to spray some PB blaster on it and let it set over night. Hopefully that will help.

[geoffinbc]

Your need a puller. It is a press fit. I found I needed to grind my puller jaws on the back side in order to fit between the gear and main bearing.

[eckoxl]

What about getting it on?

[RedBird]

that's something you're gonna have to take up with your significant other....

is it odd/strange that on my last 2 motors that i could slide the crank sprocket on and off by hand?

i'd say heat it up to expand it but that could compromise a lot of strength... soo..... i'd say make sure the crnak is clean of burrs and such(remove any with emery cloth, gently), then make sure you put some oil on it and coerce it on with oh, say, a small piece of pipe(to hit the sprocket but not but crank snout) and a mallet sounds liek it'd work good to me, long as you're careful.

[eckoxl]

that's something you're gonna have to take up with your significant other....

WOW. lol.

Yeah, I'll try tapping it on with a pipe. Unless anyone else has an idea...

[Superdave]

you'll need a 2 or 3 jaw puller.


I have a gen2 gear stuck on a crank right now, no fun.

[3400-95-Modified]

is it odd/strange that on my last 2 motors that i could slide the crank sprocket on and off by hand?

Later year models the ones with the narrower timing chain were not a press fit, this is why.

[Superdave]

I got bored and made this at work today.. going to try and use it in combination with my regular harmonic balancer puller tonight. The black plates are 1/4" steel and the silver ones are 1/8". It's adjustable a few different ways so we'll see what happens...

[60dgrzbelow0]

Dave's design is a very clever one. Here are some additional images of the Three Prong Tool suggested by him and Geoff as well in action and the Crank Sprocket Installation tool from Kent-Moore to get the new one back on. Accidentally pounding on the end of the crank can de-tune it, so a short length of galvanized pipe extension from AutoZone and the side of a large plastic mallet can be used to pound it back on until it destroys the impact end of the pipe and finally bottoms out for proper alignment will finish the job nicely. Like vengeance...this is a mechanical fix that is "Best Served Cold" as introducing concentrated heat on the assembly might cause the oil in the block to congeal and plug up your Oil Pump Screen or even compromise the strength of the metal parts being heated incidentally in that area. A swipe of Moly-D grease on the crank nose just in front of the small gear will allow it to slide off with the use of the tool and drop into your hand like an Oreo Cookie into a Glass of Milk.

http://www.handsontools.com/Kent-Moore-J-38612-Camshaft-Sprocket-Installer-for-GM_p_721-16068.html

[tkoforpresident]

Bob, remember that Crankshaft socket you told me to buy? It ended up being extremely useful and we even used it to put the crank gear back on!

we used it as a spacer since the crank bolt fit through the square cut out for the socket wrench to go into. All we had to do was fit the socket on the end of the crank, and then tighten down the crank bolt until it went all the way!

[60dgrzbelow0]

Bob, remember that Crankshaft socket you told me to buy? It ended up being extremely useful and we even used it to put the crank gear back on!

we used it as a spacer since the crank bolt fit through the square cut out for the socket wrench to go into. All we had to do was fit the socket on the end of the crank, and then tighten down the crank bolt until it went all the way!

Yes Max... I went out and rifled my specialty tool box and snapped the attached image with the proper PN and description.

To Whom It May Concern...

This tool... (if it is identical to the one Max has)... has a small, metric threaded bolt that should be screwed in snugly inside the nose of the crankshaft and while holding the new, small cog gear aligned with the Woodruff Key...(and with plenty of Moly-D covering the larger bolts threads and mating surfaces between the hex bolt and the outer face of the roller bearing that presses on the outer facing of the gear)...You can then slowly (and almost effortlessly) tighten down until the cog bottoms out in the ogive curve of the crankshaft... a short length of galvanized pipe slightly larger than the outside diameter of the crankshaft must be used in between the cog gear and the inner race of the bearing after the small gear is initially pushed onto the nose of the crankshaft. This will properly align the small cog with the larger camshaft gear which should be installed with the chain after this part is completed. It sure "beats" giving any new parts a "beating" to get them installed. Oh...and this is also the prescribed tool to use to easily install the Harmonic Balancer, too... without the pipe section in between...of course...

[eckoxl]

Well my gear puller is too cheap and bent, so im going to exchange it for a stronger one tomorrow. spray some more pb blaster on it as well.

[Superdave]

My contraption worked well after i took the grinder to it and narrowed it down a little.


too bad i found out later on that the crank is junk

[eckoxl]

Got old gear off and new gear put on.

[60dgrzbelow0]

Here are better descriptions of the two pullers that will work for the Crankshaft Gear Removal, should anyone want to find them online and get the right ones for the job... (See attached Images...)