HEXA

ENGINE

c) Oil Cooler :

Oil passage into Filter

Passage of filtered oil into Block

Oil cooler is heat exchanger which uses coolant to

reduce the temperature of oil coming from the oil

pump. It is mounted on the oil filter bracket.

NOTE



For other details refer overhauling

procedure for oil pump in engine section.

d) Hydraulic Lash Adjuster (HLA) :

Hydraulic Lash Adjuster supports the pivot end of

the rocker arm while automatically controlling the

rocker arm position to keep it in contact with the

camshafts and valve.

The range of the hydraulic lash adjuster

accommodates engine build tolerances; hence no

adjustment is required during engine assembly.

At all engine working conditions it maintains zero

clearance between rollers rockers and valve stem.

MAINTENANCE

Hydraulic lash adjuster uses Engine oil pressure

for its operation. In case of a freshly assembled

Engine, do not run for a long time; there are

chances of valve train noise / tappet noise

appearing when the engine is started.

HLA noise can be heard as repeated tappet like

noise when engine is running at low idle speed.

Following procedure is recommended to eliminate

the noise.



Raise the Engine speed to 500rpm without

load

(Vehicle stationary)

to bleed the

hydraulic chamber of HLA. The noise should

disappear in15-30 seconds.



If the noise still persists, run the engine further

under same condition

(no load at 500 RPM)

for several minutes. The noise should

disappear in 3 to 30 mins, in few cases.