Inspecting And Adjusting Low Idle Speed And High Idle Speed; Preparation; Adjusting Low Idle Speed; Adjusting High Idle Speed - Mitsubishi Heavy Industries SL Series Service Manual

1.4 Inspecting and adjusting low idle speed
and high idle speed
(a) The minimum no-load speed (low idle speed) and the maximum no-load speed (high idle speed) of each engine
have been checked on test bench and then their setting bolts have been sealed at the factory. Only the service
shops designated by Mitsubishi are authorized to perform checking and adjustment of these settings.
(b) Be sure to seal all the external stoppers in the same manner as they were sealed at the factory if adjustments
have been made on the governor.
Whether the seals are intact or not has important bearing on the validity of claims under warranty. Be sure to seal
all of the specified locations.
(c) When inspecting and adjusting the governor, be prepared to operate the engine stop lever manually in anticipa-
tion of engine overrevving (running at an extremely high speed).
1.4.1

Preparation

(1) Operate the engine to warm up until coolant
temperature reaches 60°C or higher.
(2) Make sure that valve clearance, fuel injection timing,
nozzle opening pressure, spray condition, and oil
sealing are normal.
1.4.2

Adjusting low idle speed

(1) Loosen the lock nut of idling set bolt.
(2) By turning the bolt, adjust the low idling speed.
(3) Secure the set bolt with the lock nut.
1.4.3

Adjusting high idle speed

(1) Loosen the lock nut of high speed set bolt.
(2) By turning the bolt, adjust the high idling speed.
(3) Secure the set bolt with the lock nut.
ADJUSTMENT AND OPERATION
Low speed position
(low idle)
High speed
position
Lock nuts
Adjusting engine speed
Low idling
set bolt
High speed
set bolt
13-5