4. Maintenance & Inspection 4.1 General Inspection Rule s Consult Your YANMAR Dealer or Distributor . Specialized technicians are ready to assist you with periodic inspections and mainte- Conduct Periodic Inspe c tion for Your Safety . The functions of engine components will nance. Consult your YANMAR dealer or distributor in accordance with the service agreement. degenerate and engine performance will drop according to the use of the engine. If countermeasures are not taken, you may encounter unexpected troubles while cruising at sea. Consumption of fuel or Servicing To o ls Prepare servicing tools onboard to be ready for inspecting and servicing the engine and other equipment.
lube oil may become excessive and exhaust gas and engine noise may increase. These all shorten the life of the engine. Dally and periodic inspection and servicing increase your safety at sea. Tightening Torque of Bolts & Nuts Over-tightening of bolts and nuts causes them to come off or their threads to be Inspect Before Starting. Make it a daily rule to inspect before starting. (See 3.3.1) damaged. Insufficient tightening causes oil leakage from the installation face or troubles due to the loosening of bolts. Bolts and nuts must be tightened to the appropr iate tightenmg torque. Important parts must be tightened with a torque wrench to the correct tightening torque and in the right order.
Consult with your dealer or distributor if the servicing requires the removal of such parts. Peri odic Inspe ctio ns at Fixed Interval s. Periodic inspections must be made after every 50, 150, 300 and 600 hours of use. Conduct periodic inspections according to the procedures described in this Operation Manual. U se Genuine Parts . Be sure to use genuine parts for consum- able and replacement parts. Use of other parts will reduce engine performance and shorten the life of the engine. The standard tightening torque for standard bolts & nuts is listed below. r Apply the following tightening torque to bolts having "7" on the head . ( JIS strength classification:
1n T ig hten bolts with no "7" mark to 60 % tighten i ng torque . If the parts to be tightened are made from light alloy aluminum, ti ghten the bolts to 80 % tightening torque . Bolt dia. x pitch mm M6x1.0 M8 x1.25 M10x1.5 M1 2x1.75 M14x1.5 M16x1 .5 Tightening torque Nm 11 ± 01 26 ± 03 50 ± 05 90 ± 1 0 140 ± 15 230 ± 20 ---- ---- --~ -~------~ -~ 34