J 24270 Ridge Reamer
1. Use the J 24270 in order to remove the ridge or the deposits from the upper end of the cylinder bores.
1.1. Turn the crankshaft until the piston is at the bottom of the stroke.
1.2. Place a cloth on top of the piston.
1.3. Perform the cutting operation with the J 24270.
1.4. Turn the crankshaft until the piston is at the top dead center (TDC).
1.5. Remove the cloth and the cuttings.
1.6. Repeat this procedure for each cylinder.
2. Before removing the pistons and the rods, check the pistons and the rods for cylinder identification numbers.
3. If the pistons are not numbered, use a metal number stamp in order to mark the piston, the rod and the cap using the following procedure:
• Mark the cylinder number, on the bottom of the front section of the piston boss, of each piston.
• Mark the cylinder number on the bearing tang slot side of both the rod and the cap .
• Mark the components from the front to the rear, with the engine in an upright position and viewed from the front.
• The left bank is numbered 1-3-5-7, while the right bank is number 2-4-6-8.
• Be sure to mark both, the rod and the cap with the correct cylinder number.
• Keep the connecting rod and cap together as mating parts.
4. Remove the connecting rod nuts.
5. Remove the connecting rod cap.
6. Remove the bearing inserts from the connecting rod.
7. Attach two short pieces of 10 mm (3/8 in) hose to the connecting rod bolts, in order to protect the crankshaft journal during removal.
8. Push the connecting rod and the piston out of the bore.
9. After removal, assemble the connecting rod, the cap and the bearings. If reusing the bearing inserts, keep the inserts in the rods and cap from which they were removed.