Wrist Pin?

[uselesstactics]

Ok so I am looking at a decent Comanche on craigslist that says it has a bad wrist pin. I am clueless when it comes to engines except mild repairs. Wondering how bad of an issue this is and how costly. Really would like to own a Comanche and have already owned an XJ and ZJ which were both fun and lifted. Now I just want a DD/Weekend Warrior type vehicle and a Comanche seems perfect, and sexy :)

 

EDIT: It is a 2.5 with nothing stating the mileage.

[Biotex]

Wrist pins are how the piston is attached to the connecting rod. A bad wrist pin more than likely means a complete rebuild. Could also be bad enough that the block is toast. Only way to know is to pull the head or pan.
 You might get lucky, but it could go either way, so be prepared.
 
If you want, you could pull the pan, and perhaps remove the bad piston/rod from the bottom without removing the head. I have done it that way before as a temporary fix, but again, when an engine gets in that condition, it is best to bite the bullet and rebuild or replace.
 
Long blocks are not that expensive. It's the labor that gets you if you don't DIY.

 

Edit:

Best case scenario: You can drop the pan, and remove the bad parts. You will need a new or used piston, wrist pin, connecting rod. Then you have the rings and bearings...

 

You "could" get by with reusing the old ones if you can get the off without damage. Not the ideal way to do this, but like I said, it is doable if you just want to get the truck running.

 

IMO if you are going to go that far, you are better off just finding a different engine, or pulling the head and doing a re-ring and bearing job.

[uselesstactics]

Thanks, gonna look into some things and consider it.

[randomguy310]

how would someone know it was a bad wrist pin.. could be a rod bearing

[jimoshel]

Use a stethescope or just your ear. A wrist pin has a lighter knock. Also stick your head under the hood. A wrist pin will be louder than a rod. Crawl under the Jeep. The rod will now be louder than a pin.