Re·screwing Of Main Bolts - Mitsubishi 4DQ50 Service Manual

involves a sharp drop of its capacity. Remember especially that a decrease of
specific gravity in inadequate charge might make electrolyte ready to freeze in
a cold area. (Refer to Sect. 8, "Handling in Cold Weather", Chap. 1).
3) Good battery maintenance requires moreover such cares as mentioned below.
a) Keep battery always clean and dry.
b) Connect terminals always firmly.
Corroded parts of terminals can be easily cleaned by washing with solution of
sodium bicarbonate. But be careful not to splash it into cells. After polishing
terminals well, connect them firmly and give a thin coating of grease. Never
try to hammer or hit them off or on.
c) Don't put any metal articles such as pliers and spanners on battery. Such
careless doing will short-circuit it with a spark and might cause a serious
accident, to say nothing of early break-down of battery, nor bring naked fire
near it.
7 RE-SCREWING OF MAIN BOLTS
With initial fatigue of gaskets and packings in newly assembled engine and with its long
use, bolts will get loose. To prevent accidents ariSing therefrom, check main bolts at regular
intervals to see if they are working tight enough and if loose, screw again accofdingly. Apart
from this, always give attention to those bolts that can be seen from outside. Re-screwing of
main bolts must be done according to the given below clamping Torque List with fit torque
wrenches, so should be entrusted to your dealer or a service shop.
Clamping Torque List for Model 4DQ50 Engine
Clamping Torque
Remarks
Bolted Parts
Pitch
kgm ft-Ib
Cylinder head
12P-1.75
12 86
See Par. 7-1 below.
Main bearing caps 12P-1.75 8.5 60
Connecting rod caps
10P-1.5 5.5
38.5
Flywheel
12F-1.5
8.5 60
Nozzle holders
24P-2.0 5 35
Nozzle tip retaining nuts
22P-1.5 7 50
Delivery valve holders 18P-1.5 3
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