Crankshaft - GT3

Disassembling and assembling crankshaft - GT3




Tools




Components, exploded view







Designations and notes

Disassembly





1. Remove tensioning sleeve (6 x 16) with a vice-grip wrench. Clamp special tool retaining plate P 209a in the vice. Fasten the crankshaft to the retaining plate with 3 pan-head screws LO No. 928 102 151 01.
2. Loosen connecting rods with socket wrench insert M14 and remove.





3. Remove snap ring with snap ring pliers.





4. Remove spacer ring and timing gear with a conventional puller.
5. Remove Woodruff key.
6. Remove crankshaft from retaining plate. Check crankshaft for shocks, cracks and wear. Carry out sounding test.

Assembly
1. Clean crankshaft thoroughly. Rinse out oil bores with a hand pump and solvent naphtha. With a visual inspection, check whether the oil ducts are blocked at the bearing surfaces and on the front face (aluminum stoppers).
2. Clamp crankshaft. Insert and align new Woodruff key for timing gear.
3. Warm the timing gear to approximately 150° C in an oil bath or on a heating plate and push it on to the crankshaft journal up to the stop. The collar of the timing gear must point to bearing 7.





Note: As an assembly aid, remove the timing gear from the heat source e.g. with a piston restraining strap and quickly mount or push it into place on the journal.

4. Heat up the spacer ring in the same way and push it on up to the stop.





5. Mount snap ring. Select the corresponding snap ring using an insertion test. The snap ring must be inserted without play.
The snap rings are available:
Part number Thickness Identification mm
901.102.148.00 2.4. blank
901.102.148.01 2.3. tempered blue*
901.102.148.02 2.2. tempered yellow/ brown
901.102.148.03 2.1. black, gun-metal finish most frequently used snap ring for first assembly.
* most frequently used snap ring for first assembly.





6. Mount connecting rods on the crankshaft. The thread of the con-rod bolts must be greased without fail. Use special grease Part No. 000.043.300.12. The matching numbers of the con-rods and the con-rod bearing caps must all point to the same side.





7. Tighten con-rod nuts. When tightening, the con-rod bolt must be protected against turning at the same time by a second person using a feeler gauge.

Tightening torque:
Initial tightening 30 Nm (22 ft. lbs.)
Final tightening 1 x 90° turn