wsm wg972-e4 - Page 93

ENGINE
WG972-E4, WSM
1-S2
Deficient Output 1. Fuel is insufficient Check the fuel system –
2. Damaged spark plug Check and adjust or replace 1-S20,
1-S21
3. Damaged ignition coil Check and replace 1-S21
4. Wires disconnection or
damaged
Check the wire harness –
Reconnect or replace –
5. Bad connection of ignition
coil and spark plug
Reconnect –
6. Clogged air cleaner Clean or replace G-14, G-24
7. Insufficient oil in lubricating
system
Check oil pressure and lubricating 1-S16
Repair 1-S57
8. Oil filter clogged Check and replace G-18
9. Improper valve clearance Check the compression pressure 1-S14
Adjust 1-S15
10.Improper intake and
exhaust valve sealing
Check the compression pressure 1-S14
Check and replace 1-S42
11.Excessive wear of rings
and liners
Check the compression pressure 1-S14
Check and replace 1-S50,
1-S56
12.Excessive carbon in
engine
Remove carbon 1-S40
13.Improper clearance of
bearing
Check and adjust 1-S52,
1-S54,
1-S55
Rough Low-speed
Operating And Idling
1. Damaged spark plug Check and adjust or replace 1-S20,
1-S21
2. Damaged ignition coil Check and replace 1-S21
3. Wires disconnection or
damaged
Check the wire harness –
Reconnect or replace –
4. Bad connection of ignition
coil and spark plug
Reconnect –
5. Improper valve clearance Check the compression pressure 1-S14
Adjust 1-S15
6. Improper intake and
exhaust valve sealing
Check the compression pressure 1-S14
Check and replace 1-S42
7. Excessive wear of rings
and liners
Check the compression pressure 1-S14
Check and replace 1-S50,
1-S56
Symptom
Probable Cause and
Checking Procedure
Solution
Reference
Page
KiSC issued 07, 2015 A