Lubrication System
10---1
10. LUBRICATION SYSTEM
A. Reconditioning of oil relief valve
for lubricating oil pressure
If the engine lubricating oil pressure is insufficient or if it varies,
the relief valve should be checked after first checking the oil
level.
210--- 1
1. Remove the cover over the valve and spring. Take care of
the washer between the cover and spring. Remove the valve
insert together with the valve cone and ensure that the o---ring
is also removed.
2. Clean the parts and check that the valve cone slides freely
in the insert and that the sealing surface are undamaged. Mi-
nor damage can be adjusted, but in general, damaged parts
should be changed. Scrape off any remains of the gasket.
3. Assemble the valve with a new o---ring and insert it in the
cylinder block. Place the washer and spring in the cover and
fit it with a new gasket.
210--- 2
4. Note that the relief valve cover is not symmetrical. The
greater distance between the spring housing and bolt should
be turned downwards.
Note!
From engine no. J 7595 (engines without oil cooled piston)
From engine no. J 14016 (engines with oil cooled piston)
The engines are equipped with a new type of oil pressure
valve. In the construction of the new valve the hydraulic vibra-
tions are damped, it is more reliable and it gives the best, opti-
mised pressure level.
210--- 1/1
Loctite 638
B. Removing and dismantling lubri-
cating oil pump
1. Drain the engine oil and remove the oil sump.
2. Remove the oil pump suction and pressure pipe.
3. Remove the oil pump together with any shims between the
pump and the cylinder block.
4. Remove the pump cover and the gasket. Remove the gear
on the dead axle.
5. Clamp the pump gear across the teeth in a vice fitted with
soft jaws, and loosen the drive gear nut. Knock the gear wheel
off by hitting the end of the shaft with a soft hammer. Pull out
the drive shaft---gear wheel
6. Clean the parts and check for wear and other damage.
Compare with the specifications. Change damaged parts and
all seals.
60 Nm
210--- 3
7. On 620/634---engines the bearing points are provided with
separate bearing bushings. If You change the bushings, ma-
chine them to dimension of
18,000...18,018
after fitting.
