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Unread 05-17-2010, 01:10 PM   #1
MikeL95YJ
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Join Date: May 2010
Location: San Diego
Posts: 11
head bolt pattern/numbering system on a 4 cyl.?

I got the torque settings for my '95 2.5 liter head bolts, but need help identifying the #8 bolt. Are they numbered 1-5 on driver's side front to rear, 6-10 passenger side, OR 1-9 odd on driver's side front to rear, 2-10 even on passenger side front to rear, OR vice-versa on any of these, OR some other less logical pattern? thanks--Mike

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Unread 05-17-2010, 02:39 PM   #2
idaholtby
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1991 YJ Wrangler 
 
Join Date: Apr 2008
Location: Meridian, Idaho
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Quote:
Originally Posted by MikeL95YJ View Post
I got the torque settings for my '95 2.5 liter head bolts, but need help identifying the #8 bolt. Are they numbered 1-5 on driver's side front to rear, 6-10 passenger side, OR 1-9 odd on driver's side front to rear, 2-10 even on passenger side front to rear, OR vice-versa on any of these, OR some other less logical pattern? thanks--Mike
I created this jpeg from info derived from my Chilton's. (That is my disclaimer) but this should be correct for all model year 2.5L Jeep engines...
2.5l-head.jpg  
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Unread 05-17-2010, 03:15 PM   #3
MikeL95YJ
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Location: San Diego
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Steve--This is exactly what I needed! My guess did not include the start in the center and spiral clockwise order, but definitely makes it easier to follow the order when torqueing. I'll be adding a Chilton's YJ manual to my collection, as soon as I need another major repair. Thanks for the info--Mike
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Unread 05-17-2010, 03:33 PM   #4
idaholtby
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1991 YJ Wrangler 
 
Join Date: Apr 2008
Location: Meridian, Idaho
Posts: 2,554
Quote:
Originally Posted by MikeL95YJ View Post
Steve--This is exactly what I needed! My guess did not include the start in the center and spiral clockwise order, but definitely makes it easier to follow the order when torqueing. I'll be adding a Chilton's YJ manual to my collection, as soon as I need another major repair. Thanks for the info--Mike
Most all head bolt patterns follow this same pattern so that there is no trapped stress between the bolts. As the bolts are tightened in sequence, the stress is pushed outboard rather than being trapped otherwise. You are fortunate in that you reside in San Diego, as one of our most gifted mods lives in that area. If you ever get stuck and especially need mechanical assistance, then I am sure that Joe Dillard will lend a hand. He commonly offers his assistance to those within his reach. (It may cost you a beer or two, but I suspect he would still help for free) On a side note, the Chilton's is a good reference but falls far short of a factory service manual. It is definitely a good tool to have and if your needs surpass it, you can then get a fsm OR ping the board for help.
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