tr wrote:
> Yesterday..my serpentine belt "came off" the pulley assembly..I notice
> today that the main pulley on the engine block at the bottom has
> appeared to slide out about 1/2 "...thrwoing off the belt alignement.
> There is one hex bolt in the center of the lower pulley...can I just
> tighten this up and will it pull the pulley back the 1/2 inch to the
> engine block...or is there something else major going on here ?
>
> Jeep Pioneer Cherokee 1987 4x4 4-speed manual 4.0 engine

Sounds to me like your harmonic balancer has split.
http://revbeergoggles.com/hb/

The question is, has the whole balancer slid out or just the outer ring.
The balancer is two parts of iron with a rubber isolator band between them.

If the balancer has moved then you need to replace it now.
Not a hard task if you get the correct tools. And don't let someone
tell you to beat the thing on with a hammer or draw it in with the bolt.
That's a great way to mess up the crankshaft and main bearings.

If the balancer is fine and the whole crank is actually able to move 1/2"
then that's a "bad thing" and will require serious engine work.

--
DougW

 

tr wrote:
> Yesterday..my serpentine belt "came off" the pulley assembly..I notice
> today that the main pulley on the engine block at the bottom has
> appeared to slide out about 1/2 "...thrwoing off the belt alignement.
> There is one hex bolt in the center of the lower pulley...can I just
> tighten this up and will it pull the pulley back the 1/2 inch to the
> engine block...or is there something else major going on here ?
>
> Jeep Pioneer Cherokee 1987 4x4 4-speed manual 4.0 engine

Sounds to me like your harmonic balancer has split.
http://revbeergoggles.com/hb/

The question is, has the whole balancer slid out or just the outer ring.
The balancer is two parts of iron with a rubber isolator band between them.

If the balancer has moved then you need to replace it now.
Not a hard task if you get the correct tools. And don't let someone
tell you to beat the thing on with a hammer or draw it in with the bolt.
That's a great way to mess up the crankshaft and main bearings.

If the balancer is fine and the whole crank is actually able to move 1/2"
then that's a "bad thing" and will require serious engine work.

--
DougW

 

tr wrote:
> Yesterday..my serpentine belt "came off" the pulley assembly..I notice
> today that the main pulley on the engine block at the bottom has
> appeared to slide out about 1/2 "...thrwoing off the belt alignement.
> There is one hex bolt in the center of the lower pulley...can I just
> tighten this up and will it pull the pulley back the 1/2 inch to the
> engine block...or is there something else major going on here ?
>
> Jeep Pioneer Cherokee 1987 4x4 4-speed manual 4.0 engine

Sounds to me like your harmonic balancer has split.
http://revbeergoggles.com/hb/

The question is, has the whole balancer slid out or just the outer ring.
The balancer is two parts of iron with a rubber isolator band between them.

If the balancer has moved then you need to replace it now.
Not a hard task if you get the correct tools. And don't let someone
tell you to beat the thing on with a hammer or draw it in with the bolt.
That's a great way to mess up the crankshaft and main bearings.

If the balancer is fine and the whole crank is actually able to move 1/2"
then that's a "bad thing" and will require serious engine work.

--
DougW