Bolts' & Components Tightening Torques

 Alza 2010 Bolts' & Components Tightening Torques. Why it is important to torque the bolts / screws at its specified settings ? 

Correct tightening torques for bolts / screws is essentially important to keep the tightening balance between bolts equal when working with cars. 

Over tightening the bolts usually cause the bolts and its hole thread damage or worse broken bolt which make an extra job to remove them. To make matter more worst when the bolt located within difficult area (tight spaces) to reach which possibly taking apart the whole engine to get it removed. This isn't worth the job when only one bolts cause the whole things to be opened.

Imbalance torque tightening between bolts also can damage bolt / hole threads because the car engine constantly under vibration force when it is running. Over time it can damage the threads as one or more of the bolts break lose by the force of vibrations. Apart from that imbalance torque tightening also posses the risk of leaking for fuel and oils seal components which may results in fire hazards and lacking in lubrications respectively. 

For the under tightening (lose) bolts common problems usually associated to fuels / oil seals component leak. Apart from that it could also generate unwanted sound of lose metals grinding / knocking / clunking / clicking against each other. Lose bolts also pose risk of accidental separations / detachment of the objects overtime which is dangerous especially within the suspensions and power steering parts.

Below bolts / screws tightening torque (general) for Daihatsu cars 

 

Component	Tightening Torques
Tires Lug Nut	88.3 - 117.7 N.m (65.1 - 86.8 ft-lb OR 9 - 12 kgf-m)
Engine Oil Drain Plug	23.6 - 35.4 N.m (2.4 - 3.6kgf-m)
Oil Filter	12 - 16 N.m (1.2 - 1.6kgf-m)
ATF Oil Pan Bolts	29.4 - 49 N.m (21.6 0 36.1 ft-lb OR 3 - 5 kgf-m) Check ATF Fluid Level 1. Check fluid level when transmission fluid temperature is 70 - 80 degree Celcius 2. Drive the car for 15 minutes at speed 60 km/h or 30 minutes at speed of 40 km/h. The fluid temperature becomes about 70 - 80 degree C 3. Park the vehicle on a level surface 4. Run the engine at idling speed and depress the brake pedal 5. Move the shift lever from P to 2 smoothly and return to P 6. Pull the dipstick out and wipe it clean. Insert it into original position 7. Pull the dipstick out again and check the level to see if it is within "HOT" range. 8. If the oil level is too low, add more fluid - "DO NOT OVERFILL"
Inner tie rod	100 N.m
Tie rod end bolt	41.7 ~ 52 N.m
Power steering bush	63nM
Water pump pulley bolt	8.1 ~ 13.8 N.m
Water pump bolts	7.2 ~ 11.7 N.m
Crankshaft pulley bolt	120 ~ 140 N.m
Idler pulley bolt	35.2 ~ 52.8 N.m
Crank angle sensor	5.3 ~ 9.8 N.m
Valve cover	Cap nuts (2 pieces) 7.2 ~ 10.8 N.m Nuts 8.8 ~ 13.2 N.m
Ignition coil	6 ~ 9 N.m
Spark plugs	14.4 ~ 21.6 N.m
Exhaust manifold	20 ~ 30 N.m
Coolant temperature sensor	16 ~ 24 N.m
Oxygen sensor (o2 sensor)	29 ~ 39 N.m
Intake Manifold	15.2 ~ 22.8 N.m
Fuel delivery pipe (rail) and fuel injectors	16.8 ~ 25.2 N.m
Oil pan no.1 (Top)	6.0 ~ 11 N.m (M6 x 1.0 bolts) 29.4 ~ 54.6 N.m (M10 x 1.25 bolts)
Oil pan no.2 (Bottom)	6.8 ~ 10.2 N.m
Flywheel (drive plate)	32 N.m (Temporary tightening torque for each bolt) 73.3 ~ 82.7 N.m (Final tightening torque)
	19 +/- 4 N.m