Jeep Engines - Oljeep

~~2.5L POWER TECH IN-LINE 4 (INTRODUCTION) 27Note: The following procedures for the 2.5L Power Tech In-Line 4 cylinder engine are intended to be performed invehicle,on a dynamometer, or as an individual change/modilication.In addition to the information contained in this chapter, much of the information contained in Chapter 4, 4.0L Power TechIn-Line 6, is generic to all Jeep engines (including the 2.5L). Therefore, in addition to this chapter, we highly recommendthat all 2.5L engine owners read Chapter 4 in its entirety.For additional 2.5L engine general service information, refer to the proper service manual.IntroductionThe Jeep 2.5 liter (150 cubic inch displacement) engine is acast iron, overhead valve, In-Line 4 cylinder design. It has astandard bore and stroke of 98.45 x 80.97 mm (3.876 x3. 188"), and a 9.2:l compression ratio.The 2.5L has a liquid cooled, forced circulation cooling systemwith a capacity of 9.5L (10 quarts-MJKJ vehicles); 8.5L (9quarts - YJ vehicles). The cylinders are numbered 1 through 4from front to rear. The firing order is 1-3-4-2 (Figure 2-1).For more information, refer to 2.5L Engine Specifications,'Engine Assembly' section of this chapter.2.5L Engine General SpecificationsNote: The following information has been reprinted fromthe 1999 Jeep Wrangler Service Manual.Engine Type ........... In-Line 4-cylinderBore and Stroke ........ 98.4 x 81.0 mm (3.88 x 3.19")Displacement .......... 2.5L (1 50 CID)Compression Ratio ...... 9.1 :IFiring Order ........... 1-3-4-2Lubrication ............ Pressure Feed-FullFlow FiltrationCooling System ........ Liquid Cooled-ForcedCirculationCylinder Block ......... Cast IronCrankshaft. ............ Cast Nodular IronCylinder Head. ......... Cast IronCamshaft ............. Cast IronPistons ............... Aluminum AlloyCombustion Chamber .... Dual-QuenchConnecting rods ........ Cast Malleable Iron.* ...