crankshaft bolt removal

[diamondsm]

How to remove the crankshaft bolt?

ive done alot of research on this subject and have only found a couple ways to do it

1. attatch a 1/2" breaker bar to the bolt brace it against the ground and bump the starter

2. impact gun

3. wrap a towl around an object and place it between the block&crank to hold it still and get it with a breaker bar

4.chain locks (its a chain/vice grip that you lock around your crank sprocket and brace it to keep it from turning

all theese methods work but they have there cons, you cant do #1 inless the engine is assembled, impact gun are nice but are not always available and do not always work (my mechinest used an 1100lbs impact on an old 4g63 project and it did not budge)as for #3 i dont really wanna jam anything in my block but it will work and #4 works but it will ruin your crank sprocket

NOW FOR MY NEW WAY!! if anyone as heard of this let me know ### i dont wanna take credit if i did figure this out

take a peice of 3/8 all thread rod cut it to about 16" turn your crank till the crank is up on the #1 and #4 cylinders it will look like a hook (refer to pic 1)place the all thread rod across on the inside of the main cap bolts (refer to pic 2)turn the crank till it locks into place and use a 1/2" breaker bar on the crank bolt it should pop right off

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[juntjoo]

I just used a 525 ft-lb cordless impact today. Worked like a charm

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[MuffinMan7580]

Or you can shove a screwdriver in the teeth of the flywheel and wedge it against something. It takes two people, but it works really well.

 

[luv2rallye]

This looks interesting: Home built crank tool for balance belt replacement

 

[DSM1G90]

I've done the spanner extention and bump the starter trick many times.

The tightening trick is to bolt on the inner part of a split harmonic balancer pulley and a chain wrench wrapped around that pulley to hold the crank, then do the torque wrench to get the bolt into torque specs.

Lots of tugging together, but it works.

 

[socalmk1]

If you wedge a screwdriver in the flywheel teeth, its easy and safer than the starter trick.

 

[mndizzum]

If you wedge a screwdriver in the flywheel teeth, its easy and safer than the starter trick.

thats how i did it, took awhile though

 

[bryanwheat]

If you wedge a screwdriver in the flywheel teeth, its easy and safer than the starter trick.

You also take the risk of damaging the teeth on the flywheel. I don't know why some people think that the pry bar method is unsafe or hard. I've literally done it 100+ times on many different types of cars. Not one single time have i had it fly off and damage anything. If you pay attention to what you are doing and wedge it in between the the control arm and sway bar than it will work every time the first time. It literally takes less than 1 minute to complete. How is wedging a screw driver in the teeth of the flywheel with one hand and using the other to loosen the bolt (which takes alot of force usually) and easier than placing a breaker bar and socket on one bolt, and turning a key?

 

[92AWDHX40]

I used a screwdriver in the flywheel method a few times, until i got my impact gun now lifes a better.

 

[diamondsm]

How to remove the crankshaft bolt?

ive done alot of research on this subject and have only found a couple ways to do it

1. attatch a 1/2" breaker bar to the bolt brace it against the ground and bump the starter

2. impact gun

3. wrap a towl around an object and place it between the block&crank to hold it still and get it with a breaker bar

4.chain locks (its a chain/vice grip that you lock around your crank sprocket and brace it to keep it from turning

all theese methods work but they have there cons, you cant do #1 inless the engine is assembled, impact gun are nice but are not always available and do not always work (my mechinest used an 1100lbs impact on an old 4g63 project and it did not budge)as for #3 i dont really wanna jam anything in my block but it will work and #4 works but it will ruin your crank sprocket

NOW FOR MY NEW WAY!! if anyone as heard of this let me know ### i dont wanna take credit if i did figure this out

take a peice of 3/8 all thread rod cut it to about 16" turn your crank till the crank is up on the #1 and #4 cylinders it will look like a hook (refer to pic 1)place the all thread rod across on the inside of the main cap bolts (refer to pic 2)turn the crank till it locks into place and use a 1/2" breaker bar on the crank bolt it should pop right off

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all those methods work but some of them can cause damage i would say the best method for doing is to just bump the starter with a breaker bar on the crank bolt......this is just the best way i could figure out how to do it with out it causing damage and with the engine disessembled.

 

[Janaelen]

FWIW, I did what luv2rallye posted a while back and it's worked like a charm. Just remember when doing this to use strong steel stock. It doesn't take but a few minutes to make and only requires a drill, metal drill bit (same diameter as the crank bolt) and a metal cutting tool (I used a jig saw and a metal blade).

For those of you who don't like making tools, there are usually available on ebay for a reasonable price.

 

[Archer Fabrications]

Whats the best way to do this in an engine stand

 

[KuckFatrina]

Stuff some shirts into the block and hit it with an impact. When I had to remove it I didn't have an impact wrench so I stuffed some shirts into the block to wedge the crank and used a 6 foot piece of exhaust pipe as a cheater bar.

 

[mitsubishikid]

One time I pulled the oil pan, and stuck a thick breaker bar in between two of the crank throws and turned the crank till the breaker bar contacted the inner wall of the block, and then I turned the crank with a 1/2 inch ratchet and a breaker bar loud snap!!! and the bolt came off.

Another trick I heard about from friends [but never tried] was putting a bunch of rope in through the spark plug hole and turning it till it would resist then use a breaker bar. after you break the bolt loose you'd pull the rope out, but I hated the idea of it possibly getting stuck on a valve which is why I never used it but It might be worth investigating.

 

[KuckFatrina]

That rope idea sounds like the epitome of backyard redneck mechanics.

 

[mitsubishikid]

That rope idea sounds like the epitome of backyard redneck mechanics.

I know right, why risk it, it might be worth it just to see what happens on a junkyard motor, but not on any of my working motors.

 

[bryanwheat]

The rope idea works great for 2 strokes and flat head engines, but on an over head valve engine it can do some real damage. I would just built a holding tool that bolts to the crank sprocket and use a big breaker bar. A good impact is the best bet, but it takes a real nice one to get them out.

 

[pauleyman]

In any case use the square hole at your own risk. Socket is preferred.