Rover's Vikingship The F.A.S.D. Control
Manuel Kit Conversion.
Rover's Vikingship


This part of site is an attempt to organize and add to the web resources for the Rover SD1 to form a cohesive and easily usable guide for those of us without easy access to expert repair and/or advice. It is not offered in any way as a definitive source and we take no responsibility for any errors that may exist.
Webmaster Rene Winters.

F.A.S.D. Manuel Kit
Partno: WZX 1872

General Comments
The F.A.S.D. unit is an auxiliary carburettor incorporating an air valve and fuel metering orifice. A temperature sensitive capsule connected to the engine cooling system, regulates the output from the F.A.S.D. The manual choke conversion replaces the temperature sensitive capsule with a mechanically operated plunger connected to a bowden cable.

Removal Of Temperature Sensitive Capsule

Disconnect the battery earth lead.
FIG. 1 ROVER 3500 (illustrated)
Remove flexible air inlet pipe disconnecting from behind bumper and air receiver mounted between rocker covers.
The aperture in the air receiver should be blanked off using existing clamp and aluminium mesh supplied in the kit.
Place mesh centrally over aperture and push clamp over stub pipe.

ROVER 2000, 2300, 2600
Remove air cleaner to gain access to front of F. A. S. D.
Models fitted with an on board computer have a fuel flow meter attached to lower part of air cleaner, do not disconnect but lower air cleaner to facilitate access.
Ensure the cooling system is depressurised. Then remove the hose connections from the water jacket and re-connect hose ends using connector provided.
Secure the modified hose assembly by taping away from moving or hot engine components.
Remove two screws (A) releasing the small water jacket from F.A.S.D. body.
A special splined socket is available from Solex distributors but careful use of a pin punch will undo the screws by gently tapping anti-clockwise against the serrations.
Note: The water jacket has a substantial spring endload over the majority of its removal (screw travel).

Dismantling The F.A.S.D. (fig 2.)

On removal of the water jacket, the following components can now be dismantled:
a   Temperature sensitive capsule
b    Black plastic bush
c    Brass collar
d    Compression spring
It may be necessary to use a pair of long nosed pliers to extract the compression spring, taking care to ease the spring past operating lever (E) inside the F.A.S.D. body.
The F.A.S.D. is now ready to receive the new components supplied in the kit.

Insertion of Plunger and Bush (fig 3.)

With the operating plunger assembled in the brass bush, insert chamfered end of plunger into body of F.A.S.D. making sure head of plunger engages behind operating lever (E) and milled flats on bush are coincident with lever (E). Note: Lightly grease components prior to assembly.

Assembly of Manual Adaptor (fig 4.)

Place the manual adaptor over position previously occupied by water jacket, it will be necessary to unclamp screw (F) to facilitate engagement of crank pin in operating plunger drive slot.
Two pan head screws and lock washers are provided for securing the adaptor.
Note: Lightly grease crank pin and plunger.

Setting "Choke off" (fig 5.)

With lever (G) sprung loaded against the back stop, push the operating plunger lightly into the F.A.S.D. body and using a suitable screwdriver, rotate spindle (H) gently clockwise to ensure engagement between crank pin and drive slot. Clamp screw (F) tightly.
On some installations, the end of lever (G) may touch the mixture pipe outlet.
Remove excess material from lever end by filing or coarse emery paper until the lever operates without interference.

Cheking "Choke On" (fig 6.)

Rotate lever (G) clockwise to the stop peg and check for freedom of movement. If the crank pin moves into the `over centre' position, the mechanism will stick in the `choke on' position. Undo clamp screw (F) and adjust crank pin position by rotating spindle (H) anti-clockwise until 'over centre' condition disappears. Full operation of plunger may be checked by manually pulling-out plunger with lever (G) against the stop peg.
There should be minimal lost motion.

I nstallation of Cable
Select preferred location of choke knob inside vehicle, typical suitable places are:
a    On the gearbox central tunnel adjacent to the driver's left knee (R.H. drive vehicles). Route cable through       air louvre passing out through front vent.
b    Under steering column.
c    On top of gearbox in front of gear shift lever passing through centre console (fascia mounting).

Using the bracket as a template, mark out position of screw holes then drill 3.5mm / 0.1378" and secure bracket with self tapping screws.

Remove lock nut and washer from choke cable and feed cable through the bracket.
Thread the washer and nut over the cable and lock in position.

Run cable through engine bulkhead, it should be possible to utilise an existing grommet although on most models a spare unused grommet exists. Care should be taken to ensure a clear kink-free run from the bracket to the manual choke unit.

It may be necessary to trim inner/outer cable on final run to choke unit. A sharp pair of wire cutters should be used.

Clamp the outer cable onto choke unit bracket with minimum protrusion through clip. Run inner cable through nipple (L) and with choke knob pushed `fully in' clamp inner cable to nipple.

F unctional Checks
Reconnect battery earth lead.
Refit air cleaner if removed and check all vacuum hoses are re-connected.
Using sufficient choke compatible with ambient conditions, start the engine.
Set the fast idle speed to the manufacturers recommendation when the engine is warm.

Trouble Shooting

I dentification of FASD Units
Isolated cases have been reported of incorrect FASD units being fitted in Service, whilst they are identical externally, the vent fitted to each model differs internally. They can be identified by a reference number stamped under the body casting on the side furthest from the carburettor immediately below the blue plastic cover.
Specifications are as follows:
Vehicle Type         FASD Ref No.       BL Part No.      
Rover 2000               4130                TZX 1005
Rover 2300               4132                TZX 1007
Rover 2600               4131                TZX 1006
Rover 3500               4027               AEU 2456

I nitial Start Mixture Enrichment
During cranking from a cold start, additional fuel is required to compensate for that which condenses out onto manifold and cylinder walls.
To achieve this a delay valve is incorporated in the adaptor block fitted between the starter and carburettor allowing additional enrichment when closed.
The delay valve consists of a ball/seat operated through an electrically heated bimetal strip.
On engine start, a separate drive module, housed in the instrument binnacle, supplies current to the delay valve permitting valve opening after approximately 15 seconds. Failure of either the drive module or delay valve will cause difficultly during starting.

D rive Module Checks
Operation of the drive module can be checked as follows:
With the engine stationary and ignition switched off, connect a volt meter across the two leads to the FASD delay valve on the carburettor. Switch on the ignition: there should be no permanent voltage present, although a momentary pulse may be observed in some cases. Start the engine, with the engine running (hot or cold), battery voltage should be present. If not, the drive module or its wiring connections is/are suspect.
The drive module should be wired as follows: (Pin connectors are on base of module.)
1 Earth (Black wire)
2 Pulse (White/Black wires (2)
3 Power (Brown/Green wires (2)
4 Not used
5 FASD (White/Blue wire)

It is important to note that if either the module or the plug connector is removed from the locating bracket; on refitting, the mounting lugs must be correctly engaged to avoid the possibility of the leads or terminals fouling the base of the instrument binnacle.

D elay Valve Checks
A moving coil or electronic ammeter should show a pulse when the ignition is switched on and then remain at zero. Ensure pulse is in correct polarity direction, rectify if not.
The meter should indicate zero during cranking; if not zero then the vehicle electrics are at fault.
The meter should indicate 4-6 amps after start for approximately 10 seconds and then drop to typically 300 mA; if not, check that 12v is being applied to the delay valve when running.

C hecks to be made before removing starter
Check damper oil levels.
Without removing the blue cover check that the needle carrier is engaged and free to move up and down, if disengaged change starter.
Check that the starter is held tight onto the carb and that the feed pipe joints are secure.
Remove starter and delay valve.

C hecks to be made after removing starter
Check function of carb non-return valve by drawing fuel out of the starter fuel feed passage along a clean plastic tube. The fuel should not fall back when the suction is ceased.
Connect 2 flying leads to the delay valve and blow into starter vacuum passage (onto the white cross). Connect the leads to a 12v battery and note the time taken before the valve opens by maintaining a constant pressure on the vacuum passage. The time should be in the order of 15 seconds.
Check that the carburettor/starter vacuum passage is clear in the carb.

T ypical symptoms and causes
Repeated fire, run, stall, when starting after a cold soak: delay valve open. Remedy: change valve.
Piling after start: delay valve closed. Depression passage blocked.
Remedy: check circuit and change valve.
Starts but will not drive: carb dampers empty. Delay valve closed or depression circuit blocked. Non-return valve not fitted to carb:
starter mis-set with no overtravel.
Extended cranking period:
faulty or dirty spark plugs or other electrical fault eg king lead off.
Feed pipe air leak or fuel circuit air leak.
Part warm restart problems: restart with throttle assistance may be required occasionally.
Engine speed increased after a few seconds running:

F.A.S.D Control



© RWP sept. 2003