9/26/2017
Service Manual Model J
http://www.sky-net.org.uk/kelvin/diesel/j_range/man/index.html
13/17
retaining ring will be destroyed. As this cannot easily be rectified, it is important to
allow no water to reach the flywheel
.
82. FRONT OIL RETAINING RING.--Fitted around the crankshaft and
immediately behind the flywheel there is a white metal ring to prevent escape of oil.
To remove it first prise off the spring and then remove the upper half of the iron plate.
The plate must be rejointed with cement
.
83. REAR OIL RETAINING RING.--Between the rearmost crank and the reverse
gear and visible from within the crankcase there is an iron plate with a white metal
bush fitting close around the crankshaft. This serves two purposes-to prevent the
escape of oil into the reverse gear and the passage of damp vapour from the crankcase
to the ball thrust bearing situated immediately behind it. The bush carries no load and
requires no attention.
*84. STARTING HANDLE.--The spring around the starting shaft brings the handle
out of engagement when the engine starts. This is necessary for safety because a
Diesel engine stopped on full compression recoils and causes the handle to spin round.
85. CRANKSHAFT BUSH.--The clearance between the bush and the shaft should be
.003". The shaft should measure between 2.749" and 2.751". Should a lower half
become damaged, order a half crankend bush. When this is placed in the cap, the
edges may stand above the flush and it is necessary first to file them flush. The
bedding of the bush should be carried out by the use of red lead and a scraper in the
ordinary manner. All bolts must be left as tight as is possible with the spanner
provided. As the upper halves control the alignment of the shaft, it is desirable to
avoid renewing them. Should it be necessary to do so, the work must be very carefully
done.
86. CRANKPIN BUSH.--The clearance between the bush and the crankpin should be
.003". The clearance may be checked by inserting between the bush and the crankpin
a feeler .003" in thickness. It is preferable to bed the bush to a mandrel which is
oversize by the amount of the clearance. Such mandrels are supplied at small cost.
They are designed to be held in the vice. When the bush has been made a working fit
on the mandrel, its clearance on the engine will be correct provided that the crankpin
is still between 2.624" and 2.626".
Do not attempt to reline any of the crankshaft bushes as it cannot be done without
elaborate appliances. For engines shipped abroad it is advisable to have spare bushes
and a mandrel.
87. TO DISMANTLE REVERSING GEAR.--Remove the control wheel bracket;
withdraw the starting shaft; remove the upper half of the case; find the joint in the
large chain and remove it; lift out the gears and the lower half of the case can be
removed.
88. TO REPLACE REVERSING GEAR.--Fix the lower half of the case; place the
gears in position. Draw in the chain by means of a copper wire passed around the
lower wheel. When the chain engages the lower wheel, help it around by turning the
