Yamaha 2014 MT-07 Service Manual

CRANKSHAFT AND BALANCER SHAFT5-89For example, if the crankcase J1 and balanc-er shaft web J1 numbers are 6 and 5 respec-tively, then the bearing size for J1 is:EAS31075CHECKING THE CRANKSHAFT1. Check:• Balancer drive gearDamage/wear → Replace the balancer drivegear and balancer shaft assembly as a set.Excessive noise during operation → Replacethe balancer drive gear and balancer shaftassembly as a set.2. Measure:• Crankshaft runoutOut of specification → Replace the crank-shaft.3. Check:• Crankshaft journal surfaces• Crankshaft pin surfaces• Bearing surfacesScratches/wear → Replace the crankshaft.4. Measure:• Crankshaft-journal-to-crankshaft-journal-bearing clearanceOut of specification → Replace the crank-shaft journal bearings.NOTICEECA13920Do not interchange the crankshaft journalbearings. To obtain the correct crankshaft-journal-to-crankshaft-journal-bearing clear-ance and prevent engine damage, the crank-shaft journal bearings must be installed intheir original positions.▼▼▼▼ ▼ ▼▼▼▼ ▼ ▼▼▼▼ ▼ ▼▼▼▼ ▼ ▼▼▼▼ ▼ ▼▼▼▼ ▼▼▼a. Clean the crankshaft journal bearings, crank-shaft journals, and bearing portions of the cyl-inder and crankcase.b. Install the crankshaft journal upper bearings“1” and the crankshaft into the cylinder.TIPAlign the projections “a” on the crankshaft jour-nal upper bearings with the notches “b” in thecylinder.c. Put a piece of Plastigauge® “2” on eachcrankshaft journal.TIPDo not put the Plastigauge® over the oil hole inthe crankshaft journal.J1 (crankcase) – J 1 (balancer shaft web)= 6 – 5 =1 (blue)Bearing color code1.Blue 2.Black 3.Brown 4.Green5. YellowRunout limit0.030 mm (0.0012 in)J1 J2 J3BJournal oil clearance0.018–0.042 mm (0.0007–0.0017in)a1b