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Old 05-23-2012, 06:29 PM
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Need Bolt Torque Specs For A 2.5 Ohv In A '95 Jeep

I hope somebody can help me with this. I am doing a re-ring and re-bearing on my buddy's '95 Jeep 2.5 engine and did a Google search on torque specs to no avail. All I could find was head bolt specs. I need torque specs. for the :

Head bolts;
Rod cap nuts;
Main bearing cap bolts;
Cam sprocket bolts;
Oil pump bolts;
Intake and exhaust manifold bolts;

I sure would appreciate the help. I want to get this together tomorrow since my buddy wants to take his restored Wrangler to Charlotte next weekend. BTW The top compression rings were broke in 1 & 3 cyls. and both compression rings were broken in #2 . Guy knocked $2500 off the price because it had so much blowby. $370.oo in parts will fix it. My labor is traded .

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Old 05-24-2012, 10:11 AM
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Quote:
Originally Posted by adantessr
I hope somebody can help me with this. I am doing a re-ring and re-bearing on my buddy's '95 Jeep 2.5 engine and did a Google search on torque specs to no avail. All I could find was head bolt specs. I need torque specs. for the :

Head bolts;
Rod cap nuts;
Main bearing cap bolts;
Cam sprocket bolts;
Oil pump bolts;
Intake and exhaust manifold bolts;

I sure would appreciate the help. I want to get this together tomorrow since my buddy wants to take his restored Wrangler to Charlotte next weekend. BTW The top compression rings were broke in 1 & 3 cyls. and both compression rings were broken in #2 . Guy knocked $2500 off the price because it had so much blowby. $370.oo in parts will fix it. My labor is traded .
This engine is a chrysler 2.5 OHV not OHC
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Old 05-24-2012, 01:17 PM
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According to my "books", it's an AMC 2.5 (150 CID). SOME Jeeps had the GM 2.5 (151), but most had the Rambler. The Chrysler 2.5 is a 153 and SOHC.

Main torque is 80 lbs. Rod bolts are 30-33 lbs.

For head bolt torque, you'll need a "Felpro Torque Spec" book. Most parts stores have them. The later version (like yours) may have "torque to yield" bolts. If the threaded portion of your head bolt is longer than about 1", they ARE "TTY" and cannot be reused. And it's not a "ploy" to sell bolts. If you try to reuse them, they WILL fail. TTY bolts "hold" better initially, but don't "return" to original length. Once "stretched", they stay stretched.

The 5/16"/8mm bolts get 22 lbs. The 3/8" bolts get 32-35. That's the "shank" diameter, not the head size.

Jim
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Old 05-24-2012, 04:11 PM
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Quote:
Originally Posted by Mr. P-Body
According to my "books", it's an AMC 2.5 (150 CID). SOME Jeeps had the GM 2.5 (151), but most had the Rambler. The Chrysler 2.5 is a 153 and SOHC.

Main torque is 80 lbs. Rod bolts are 30-33 lbs.

For head bolt torque, you'll need a "Felpro Torque Spec" book. Most parts stores have them. The later version (like yours) may have "torque to yield" bolts. If the threaded portion of your head bolt is longer than about 1", they ARE "TTY" and cannot be reused. And it's not a "ploy" to sell bolts. If you try to reuse them, they WILL fail. TTY bolts "hold" better initially, but don't "return" to original length. Once "stretched", they stay stretched.

The 5/16"/8mm bolts get 22 lbs. The 3/8" bolts get 32-35. That's the "shank" diameter, not the head size.

Jim
While waiting for a reply, I was fortunate to find a shop with the correct torque specs. The head bolts torque in steps, ending up at 110 ft lbs except for bolt # 7 which gets torqued to 100 ft lbs. I found a web site that tells how to number the bolts. The other specs were the same as you listed except that the main cap bolts are torqued in steps also.
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Old 05-26-2012, 10:28 AM
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You can find a complete workshop manual at http://oljeep.com/edge_parts_man.html for 1982. The engine basics will be the same, but that year has a carb instead of EFI. You can download a newer manual from Scribd.com for $5 (they charge a $5 a day fee, so you can get more than one for the money). There were some newer ones on an XJ site, but their tech section has been down for a couple weeks now.

The engine is indeed an AMC/JEEP engine. 1980-83 AMC/Jeep used a GM Iron Duke (Pontiac) 2.5L with SBC bell pattern. Starting in 1984 they had their own 2.5L four (sometimes called 2.46L -- the actual dimensions -- to avoid confusion with the GM motor) which is essentially a 4.2L (258) with 0.10" bigger bore with the center two cylinders removed. A new head was built with much better ports than the old 4.2L six head. This in turn became the basis for the new for 1987 4.0L -- same bore, stretched block and head.

Chrysler was using their 2.2L and 2.5L SOHC fours in the Dakota through 1995. The 2.5L only produced 100 hp/136 ft-lbs. In 1996 Chrysler saw the light and replaced the 2.5L SOHC with the stronger AMC/Jeep 2.5L. The AMC/Jeep pushrod four produced 120 hp/139 ft-lbs. It was more suited for a truck than the Chrysler motor, which was originally designed for the K-car platform. Increasing the bore to make it a bit more under square (the 2.5L SOHC) helped, but still not as much of a puller as the Jeep motor. Production stopped on the 2.2/2.5L four, but the Jeeps were still selling enough to keep that motor in production, so it was used in the Dakota as well.
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