Can anyone tell me the bolt size and thread pitch for the harmonic balancer to the crankshaft bolt on an 87 Cherokee?

 

this is what I found....be sure to check it yourself..

18mm or 11/16"

 

According to this ebay listing (https://www.ebay.com/itm/334356869219)

"Bolt is 1/2-20 (fine threads) uses a 3/4" wrench and is 1 1/4" long (threaded portion)"

I'm not suggesting you buy it nor am I affiliated with the seller. Just pointing to the source of the info.

 

You probably want a longer bolt, nut and washer to install the new balancer though. The original bolt is too short to "pull" the balancer on.

 

1/2-20 with 3/4 head is what's on there. Need a longer one to pull the balancer on.

 

There's no mumblemeters on our 4.0s!! LOL.

 

Thanks all! I used a 2 inch long bolt and just kept backing the bolt out and adding washers as I went. It is all back together with the factory bolt now. Motor mounts are next.

 

genuine question here, but are you saying there is not 15mm and 18mm head size on XJ ?

I associate those head sizes with metric, but havent checked the markings on the bolts to check, or threads with a die or gauge

Its always confused me, as there appears to be a mixture of metric and imperial head sizes

(18mm is not 11/16" = 17mm).

 

Not on the 4.0 engine.

 

Plenty of metric elsewhere, just not directly on or in the engine.

 

this really is a non issue about metric or SAE... I just copied a post from another jeep forum....didn't think it would dig out the chit shovel...

 

No chit here, I'm just annoyed that I can never find that 18mm when I need it. I still can't find that damn 10mm either. Them things have wings, I tell ya!