REMOVAL & INSTALLATION
1984-89 Accord and 1984-91 Prelude
See Figure 1
- Remove the engine from the vehicle and place it on a work stand.
- Remove the crankshaft pulley attaching bolts and washer.
- Remove the front cover and the air conditioning idler pulley assembly, if so equipped. Remove the cover assembly.
- Remove the timing belt and sprockets.
- Invert the engine on a work stand. Remove the flywheel and the rear seal cover. Remove the oil pan and gasket. Remove the oil pump inlet and the oil pump assembly.
- Insure all bearing caps (main and connecting rod) are marked so they can be installed in their original positions.
- Remove the main bearing caps (and bridge assembly, if equipped). Use a crisscross pattern making three passes to loosen the bolts.
- Turn the crankshaft until the connecting rod from which the cap is to be removed is up. Remove the connecting rod cap. Push the connecting rod and piston assembly up in the cylinder. Repeat the procedure for the remaining connecting rod assemblies.
- Carefully lift crankshaft out of the block so the upper thrust bearing surfaces are not damaged. If the bearings are to be reused, they should be identified to insure that they are installed in their original position.
- Inspect all the machined surfaces on the crankshaft for nicks, scratches or scores which could cause premature bearing wear. Inspect the bearing clearances.
- If necessary for replacement, remove the main and connecting rod bearing inserts. Refer to the applicable bearing replacement procedures in this section.
- Install a new rear oil seal in the seal cover.
- Apply a thin coat of grease to the rear crankshaft surface. Do not apply sealer to the area forward of oil sealer groove.
- Apply a light coat of assembly grease to the journals and bearings. Carefully lower the crankshaft into place.
- Turn the crankshaft throw to the bottom of the stroke. Push the piston until the rod bearing seats on the crankshaft journal.
- Install the connecting rod cap with the nuts finger-tight. Repeat this for the remaining pistons, then tighten them to the proper specification.
- Install the main bearing caps (and bridge assembly, if equipped). Tighten the bolts to specification (refer to the torque specification chart in this section). Use a crisscross pattern making three passes to tighten the bolts.
- Check the crankshaft end-play.
- If the end-play exceeds specification, replace the thrust bearing. If the end-play is less than the specification, inspect the thrust bearing faces for damage, dirt or improper alignment. Install the thrust bearing and align the faces. Recheck the end-play.
- After the piston and connecting rod assemblies have been installed, check the connecting rod side-play.
- Install the remaining components in the reverse order of removal.
See Figures 2, 3, 4, 5, 6, 7 and 8
Steps are given for crankshaft removal with the pistons in place in the block.
- With the engine removed from the car and the flywheel removed from the engine, unbolt the rear or right side cover from the engine.
- Remove the balancer drive case.
- Insert a metal dowel or similar tool in the maintenance hole of the front balancer shaft to hold it in place. Unbolt the belt sprocket and remove it.
- Remove the bolt from the maintenance hole for the rear balancer shaft. Align the bolt hole and the balancer shaft hole. Insert a 6x100mm dowel or bolt to engage and hold the shaft; remove the sprocket or drive gear.
- Remove the oil screen and the oil pump. Remove the baffle plate.
- Remove the bolts securing the bearing caps (and bridge, if equipped), then remove the bearing caps. Release the tension by turning each bolt about 1 / 3 of a turn at a time, beginning at one corner, then moving to the diagonally opposite corner. On all except Accord V-6, follow the sequence shown in the illustration.
- Turn the crankshaft so that the No. 2 and 3 crankpins are at the bottom. Remove the rod caps and bearings, keeping them in order.
- Lift the crankshaft out of the engine, being careful not to damage the journals.
- Remove the bolts securing the retainer, then remove the front and rear balancer shafts.
- Insert the bearing halves into the block and piston rods.
- Hold the crankshaft so that the journals for pistons No. 2 and 3 are straight down; lower the crankshaft into the block. Make certain the crank journals seat into piston rods 2 and 3.
- Install the rod caps and nuts finger-tight.
- Rotate the crankshaft clockwise and seat the journals into connecting rods 1 and 4. Install the rod caps and nuts finger-tight.
- Check the rod bearing clearance using Plastigage® or similar compressible measuring media.
- Coat the thrust washer and bolt threads with a light coat of clean oil. Install the thrust washers, main bearing caps and bearing cap bridge. Check the bearing clearance using Plastigage® or similar compressible measuring media.
- Tighten the bolts in two passes: On the first pass, in the correct sequence, bring each bolt to approximately 22 ft. lbs. (30 Nm). On the second pass, in the correct sequence, bring each bolt to its final torque of 52 ft. lbs. (72 Nm).
- Insert the balancer shafts into the block, then install the thrust metal to the front balancer shaft and block. Tighten the retaining bolt to 9 ft. lbs. (12 Nm).
- Make certain the mating surfaces of the right side cover and the block are absolutely clean and dry. Apply a liquid gasket sealant to the contact face of the cover, then install it on the block. Tighten the retaining bolts to 9 ft. lbs. (12 Nm).
- Make certain the mating surfaces of the oil pump and engine block are absolutely clean and dry. Apply a liquid gasket sealant to the contact surface of the oil pump. Apply grease to the lips of the oil pump seal and the balancer seal. Install the oil pump and tighten the bolts to 9 ft. lbs. (12 Nm). Wipe the excess grease from the crank and balancer shafts; check that the oil seals did not distort during installation.
- Install the baffle plate, then install the oil screen.
- Apply molybdenum disulfide grease to the thrust surfaces of the balance gears before installation of the driven gear and the drive gear case.
- Use the 6x100mm tool to hold the rear balancer shaft in place. Install the balancer pulley and gear. Tighten the bolt to 18 ft. lbs. (25 Nm).
- Pin the front balancer shaft in place and install its pulley; tighten the bolt to 22 ft. lbs. (30 Nm).
- On the balancer gear case, align the groove on the pulley edge to the pointer on the gear case.
- Hold the rear balancer shaft in place and install the gear case. Tighten the nut and bolts to 18 ft. lbs. (25 Nm).
CLEANING AND INSPECTION
See Figure 9
With the crankshaft removed from the engine, clean the crank, bearings and block areas thoroughly. Visually inspect each crankshaft section for any sign of wear or damage, paying close attention to the main bearing journals. ANY scoring or ridge on the crankshaft means the crankshaft must be replaced. Because of the crankshaft metallurgy, welding and/or regrinding the crankshaft is not recommended. The bearing faces of the crank may not be restored to their original condition which would cause the risk of premature bearing wear and possible failure.
Using a micrometer, measure the diameter of each journal on the crankshaft and record the measurements. The acceptable specifications for both connecting rod and main journals are found in the Crankshaft and Connecting Rod specifications chart in this section. If ANY journal is beyond the acceptable range, the crank must be replaced.