Crank Pulley

When my (258) engine cranks, I see it wobble. I removed the pulley and cranked the engine. I don't see a wobble in the harmonic balancer. I looked at the pulley, noticed the back wasn't flat and straightened it out. When I reinstalled the pulley and tightened the bolts, the back of the pulley distorted again.

I did this months ago. The engine runs , but the belt wobbles.

How do I find the correct pulley for the engine?

 

AFAIK there is no source for these pulleys other than another Jeep. 1974 was the last year for the power steering on the passenger side, then everything on the front of the engine changes.

I expect you'll have a single pulley groove on the damper that runs the alternator and water pump. There is a separate pulley that bolts to the front of the damper and runs the power steering. There is also a fan pulley on the water pump that has one or two grooves, depending on whether you have power steering or not.

Please clarify which part you are talking about. If the power steering pulley, it should not distort when the bolts are tightened. Unlikely you have the wrong part if the pulley fits on the front of the damper.

 

There should be a Jeep part number on that pulley.
Don't know what your exact application is. No profile info listed.
Didn't some have a reinforcement plate around the interior or inside of the pulley?
Finally, why is it distorting when tightened down?

 

It's a '74 with a 258 and T-14, from his sig. I assume it has power steering, since I believe that pulley is only present with PS. Group 1.046-1, 3181227. I don't see any additional plate in the parts book.

There is a different pulley with dealer air.

Possible he could have it backwards on the crank?

 

There's usually some on E Bay.......?
Maybe this site could help ?
https://www.americanpartsdepot.net/waterpumps.htm#hardware

 

According to engine serial number, it is a 1974 258 motor

No power steering
water pump is from a '75. It came with the jeep.
My alternator does not fit in bracket for a '74, (the one that mounts on lower driver's side of engine). I have searched but can't figure out what the alt is from.
Lower radiator angle connection for hose has been straightened to remove kink in hose.

 

You mean the build date stamp? These engines were not serialized.

It's not stock. The factory engine without power steering does not have a pulley that bolts to the front. Single groove, from the crank to the fan to the alternator.

This is from the '74 TSM.

You're going to have to figure it out, if you keep those parts.

The front of the engine in a '75 is completely different. The alternator moves to the passenger side and the power steering to the drivers side. I would start with the right water pump for a '74. 1974 and 1975 are 8120131 and 8125501 resp.

The right alternator is a Motorola and readily available.

 

I spaced out the alternator to make the belt line up with the water pump and crank pulley.

I will have to buy a different alternator and a 74 water pump so I can remove the problem pulley on the crank dampener. Then I could use the first groove on the crank and then the timing mark will not cut into the belt.

 

BUILD DATE STAMP

I am hesitant to change the water pump because I'm sure the bolts on the water pump are going to snap off. One already did.

 

I did not want to but I guess I will have to the correct alternator and water pump. I see problems removing the water pump bolts

 

Can't help you with the bolts. I have not replaced a 258 water pump. You may need to remove the timing cover and work on it on the bench.

According to the book, there's only one fan pulley for a '74 258, apparently with two grooves. It all might line up with the right water pump. There are brackets for the alternator that you'll need.

 

I'd be interested to see if Jeep part number on that crank pulley.
That will tell us what that pulley is and what it fits.

 

The pulley in question is the one that bolts to the front of the damper. It doesn't conform to the shape of the inside of the balancer and distorts when tightening the three bolts.

No number on the damper add on pulley. 2.5" ht and 2belt grooves .... you can see the distortion at the mounting holes
Pulley on fan has 2 belt grooves and 2 5/8" ht ...... I do have a pulley for one belt...same ht.
Bolt with thick washer threads in damper center
Blades on alternator will not fit inside the arc of the '74 alternator bracket for lower driver side mt.

I am going to buy the correct year water pump and find an alternator that fits.

I am not restoring this jeep.

 

Thanks again for suggestions and help

 

anyone have a cj that I can look at near Chicago? (Brookfield Zoo area)

Other than this forum, I am doing this blind

 

What are you still needing?

 

It would be nice to view a finished project. Get some tips...

I am past the hard parts. Everything is on the frame. The engine runs. I have to get some steel and start fabricating the tub. the front clip is good. Windshield and tub need work.

 

I'd guess it could be made to conform, with lathe work, spacers, or whatever it takes.