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One of the best braked
cars on the road, the 1800 has very little trouble in this
area.
Keep the adjusters free
and adjust the Mk l rear wheels regularly. Mk ll's are self
adjusting.
Mk l and early Mk ll
boosters are not as good as the PBR-VH40. It's cheaper and better to
fit the PBR-VH40, late Mk ll type, to earlier vehicles if they have
booster troubles.
If the PBR-VH40 gives
trouble it will nearly always be confined to a split in the
diaphragm actuating or the diaphragm sensing (small). Both are
easily replaced.
Brake squeal is usually
due to glazed discs and or pads. Roughen them with emery
cloth.
Boosters are available on
an exchange basis, rather than repair it yourself if you're not
confident.
Most brake problems such
as hard pedal, intermittent operation, vacuum leak, brake fluid
reaching a hot manifold causing white smoke, can be traced to
booster faults, particularly in early models.
The Mk ll 1800 booster
seems the least affected and more reliable.
Sudden low pedal, or poor
brakes in dual circuit systems is due to one circuit
failure.
Rear brake linings,
cylinder and complete assemblies are common to the Australian model
HR Holden (only Mk ll and with PBR brakes only).
More Hints and
Tips
The 'B' series engine is
very reliable and a flexible hard working unit.
Watch these
points:
* Cars
not often used or stored for some time can develop very serious
bearing electrolysis especially on the connecting rod bearings. This
can result in a fairly low mileage car throwing a
conrod.
* The
result of neglect, poor oil or an oil filter not changed regularly,
can cause a build up of acids, etc. in the oil. Acids attack the
bearing metal, causing it to corrode away from the steel
shell.
* Overheating:
Have the radiator cleaned
professionally if possible. Replace the thermostat, and remove plugs
from the engine block and clean accumulated scale. Undo the drain
plug and clean out the sediment buildup. Scale or sediment causes
most overheating problems. Use good quality inhibitor and avoid
mixing brands. The engine should never overheat if these points are
adhered to.
* Following
a motor overhaul prime the whole system with oil first. As the oil
is slow to be picked up, a set of new bearings can be ruined before
full oil pressure develops. Cranking the engine over with the plugs
removed for about a minute should suffice.
* Oil
on the clutch assembly can be traced to a failure of the rear seal
in the engine or the clutch shaft seal. Sometimes the seal trench
may be loose or worn.
* When
overhauling the motor, don't forget to remove the primary
oil strainer located at the front of the engine (near the
speedometer drive). This strainer incorporates a magnetic ring that
must be thoroughly cleaned, along with the strainer.
CARBURETTOR AND
TUNING
The SU carburettor used
on the 1800 is very reliable and provides good economy. For greatly
improved performance without sacrificing cruising economy, fit 2 x
1.75" SU's and extractors.
MGB's can be
adapted.
If hard to tune, or using
excessive fuel, replace the needle, seat and main jet (Part No TK
6001) with a matching needle. Using a different grade of oil in the
damper will alter acceleration characteristics.
The main jet and needle
are critical to good tuning and economy, and should be replaced if
in doubt.
The vacuum advance
diaphragm on the distributor is prone to leaks after a few
years.
Test to see if it holds
vacuum - if not, replace.
The two excess fuel drain
holes under the inlet manifold next to the head are prone to fail
and suck air. Remove and plug with a ¼" SAE bolt.
The ventilator diaphragm
can fracture and leak. Replace it with an identical part used on the
Series 3 Landrover.
The booster on the brake
system can leak and admit excess air. Test by blanking off the
vacuum line.
Blanking off the small
hole in the oil filler cap underside with a self tapping screw
prevents dust entry, helps prevent engine oil leaks yet still allows
engine ventilation. However, setting up an engine breather vacuum to
overcome oil leaks would be risky in dusty conditions because, with
heavy equipment, severe wear of seals and seal bosses occur with
engine vacuum conditions.
Air cleaner to carby
seal. Use an O-ring from a discarded oil filter.
Air cleaner bolt
stripped?
Braze a nut inside a
small piece of ½" tube and a large one over it to make a
replacement.
SU Carburettor - Needles
and Springs Fitted to Landcrabs:
MODEL
NEEDLE
SPRING
COLOUR
Rich
Standard Weak
Australian
Production
Mk l
SW TW CIW Yellow
Mk ll
SL Yellow
----------------------------------------------------------------------------------------------------
U.K.
Production
Mk l
SW TW CIW
Yellow
Mk ll
68/70
SA ZH CIW
Yellow
Mk ll 69/72
(Canada)
BAJ
Yellow
Mk ll S
CI TZ
CIW
Red
Mk ll 71/72,
71/74 auto
SA ZH CIW
Yellow
Mk ll
(ECE)
BBF
Yellow
Mk ll
'72/'73
ZH
Yellow
2200
BBD
Red
220 (ECE)
BBN
Red
Note:
The Mk l and Mk ll
carburettors must only be changed with the correct manifold because
the Mk l is 30º semi-downdraught while the Mk ll is
20º. |
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Send me an
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THE
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