How to remover the pulley from the crankshaft?

[Ken Bartz]

My engine rebuilder decided that I needed a different crankshaft so he found one and trued it up and installed it. Now comes my problem. The crankshaft pulley has a large V-belt grove and my generator and fan have narrow V-belt groves. This pulley also has the place to put a hand crank to start the engine. I have a spare engine with a small grove that I can get the pulley from (no hand crank).

1. How much torque is the nut put on with? (also how much torque to remove?)

2. How do I remove this nut without having the engine turn over?

I presume that the pulley is put on with a key way so as to keep the timing mark correct. One pulley nut is 1 1/2" the other is 1 3/4".

3. If I go to all of the trouble of getting both pulleys removed will they interchange? Same shaft size?

Someone will say why not just use the smaller V-belt? Because it slips on the larger V-belt pulley. This engine is a P-23, from a 1951 Plymouth.

[jd52cranbrook]

Much better to use a impact wrench if you have it, wont turn the motor that way. And yes the crank pulley is keyed.

I just pulled mine out, (P23 218cid), and have not seen the hand crank opening you mention.

[Young Ed]

You should have no trouble getting those nuts off if you can use an air gun. Then you'll need a puller to pull the pulleys.(did I get the word pull in that sentence enough?) Tap the good one back on until you can start the nut and then use it to push the pulley on the rest of the way. And then send me the wide pulley and the hand start nut

[greg g]

Used a puller on mine, whacking my ratchet with a 3 lb hammer. I had the oil pan off and blocked the crank from turning with a block of wood. I believe the torque is 125 lb ft.

[Norm's Coupe]

Ken,

Why not just change the pulley on the generator. Seems like that would be easier, if you have one.

[Ken Bartz]

The wider V-belt is not a problem with the generator. The wider belt wants or curl off of the fan pulley if is is too tight. It more than fills the V grove of the fan pulley.

[grey beard]

The fan pulley is the easiest of all pulleys to change - just four short 5/16 bolts on the fan, and the pulley's in your hand. I'd guess changing the fan and generator pulleys will make it original again, as well, unless you are working on something newer than P15/D24.

[Merle Coggins]

Hey Ken,

If you don't have an air impact wrench, you may be able to use a good breaker bar on a socket, and smack it with a hammer to loosen the nut. Then as Ed says, you will need a suitable puller. I've got a nice puller that I'd lend you if you need it. Maybe we could arrange a small work party. I recall that you have some number punches that'll work on my replacement serial # tag?

I also have the larger sockets that you would need if you don't have them either.

Let me know,

Merle

[Don Coatney]

If you remove the crankshaft pulley from the hub you can use a large Crescent wrench to remove and install the nut. I used the pictured puller to remove the hub.

Guess I question why you need to remove the hub. Why not simply un-bolt and replace the pulley leaving the hub in place? The bolt pattern for the pulley has one hole drilled off center so It will only go on in one direction.

[Young Ed]

Don the later engines got rid of that 2 piece deal. The hub and pulley for the narrow belts is one piece and you need a socket to remove the bolt and a puller for the hub.

[Don Coatney]

Don the later engines got rid of that 2 piece deal. The hub and pulley for the narrow belts is one piece and you need a socket to remove the bolt and a puller for the hub.

Ed;

My 1953 Desoto engine had the two piece deal with the skinny belt. When did Mopars do away with the hub than can use a hand crank? Were any P-15's ever equipped with the hand crank pulley? I have seen D-24's so equipped but I have never seen a P-15 with this option. And of course there is no hole in the radiator to insert the hand crank and this leads me to believe the hand crank pulleys were left over pre war stock that the factory wanted to use up.

[Young Ed]

On my truck the only thing that makes it hand crank-able is a special nut for the hub. Its got ears on it. I've got a p23 engine in my truck with the 1 piece hub and skinny belt but I could still crank start if I remembered to reuse that special nut. I wish I had a better picture of the front of my truck engine but this is the only one in my bucket. Cant tell that well but I dont have that big weight on the front of the hub. I agree that the post war cars were't intended to be crank started but they may have had leftovers in them.

[Merle Coggins]

Here's a shot of the front of my engine with the one piece pulley/hub and the hand crank nut.

After I put it on I realized that I needed to pull it back off to get the front mount bracket on. So I got to use my puller again.

Granted, this is a truck engine. Did all of the car engines have a damper? Maybe that's why they used a 2 piece hub?

Merle

[Young Ed]

With the exception of the nut my P23 engines have the same assembly. No big weight on the front.