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Search the Wayback Machine Search icon An illustration of a magnifying glass. Sign up for free Log in. Irish production in moved to the eastern outskirts of London, where he worked under the brand Fordson until , and then changed the sign to just Ford. Your email address will not be published. Use of materials placed on this site is allowed only if there is an active link to Truckmanualshub. If you have any questions, please contact us.
Fordson Dexta. Leave a Reply Cancel reply Your email address will not be published. This website uses cookies to improve your experience. We'll assume you're ok with this, but you can opt-out if you wish. Accept Reject Read More. Close Privacy Overview This website uses cookies to improve your experience while you navigate through the website. A cap located over the end of the valve stem transmits pressure from the rocker lever to the spring retainer and valve spring.
This anion allows the valve to remain free throughout its operating cycle. A decompressor, operating on all valves, was fitted to early type engines. On current engines this is optional equipment. These instructions have been prepared in orderthat the operations mqy be completed in the quickest time, involving the removal of the least number of component parts.
A guide as to whether a part is fit for re-use or not is given in the form of wear limits tabulated at the end of the section. In the case of a complete overhaul of the engine, discretion must be exercised when re-fitting parts which, although within the limits, may be subject to arduous service when reassembled.
To Dismantle Note - Where a decompressor lever is not fitted the eccentric sleeves and keys refened to are also not fitted, and the build-up is similar to that used on the Petrol and Vaporising Oil engines with the exception of the rocker levers.
Remove the pin and withdraw the decompressor lever or end plug assembly. This will disclose the eccentric sleeve key, which must be removed before the next support bracket can be pulled off the shaft. Remove the remaining parts in a similar sequence and extract the keys as they are revealed. To Reassemble 1 Fit the front end plug and retaining pin to that end of the shaft which has the pin hole centrally drilled. The front and rear brackets are interchangeable, as also are the intermediate brackets, which are identified by a tapped hole for the rocker cover bolt.
Ensure that the support bracket bolt holes are to the right viewing the shaft from the front end, with each pair of rocker levers inclined towards each other at the valve end.
To Replace 1 Fit the push rods in their original position and place the rotator caps on the exhaust valve stems if this type of valve assembly is fitted.
Care should be taken to prevent these caps falling in the engine. Rotator type exhaust valves should be set to 0. Ensure that all locknuts are tightened. Note Ensure that the decompressor control is pushed in and the locking nut screwed in before carrying out the valve adjustment. Oil seals are fitted to the stems of aU valves with the exception of the rotator type exhaust valves. To Remove 1 Lift off the vertical type exhaust pipe. If the horizontal type is fitted, disconnect the pipe at the manifold.
Also disconnect and remove the ventilation suction pipe between the rocker cover and the inlet manifold. To Renew a Valve Spring without removing the cylinder head 1 Remove the rocker cover and rocker shaft assembly, push rods and rotator caps if fitted , as described on page 5. Pull down the cam handle to compress the valve and extract the collets.
Compress the valve spring and fit a new rubber sealing ring into the lower groove of the valve stem where applicable and locate the collets. The diameter of the inlet valve head is greater than that of the exhaust valve to improve engine breathing. On current engines rotator type exhaust valves are fitted and the operation of these is described overleaf.
The inlet valve on aU engines remains the same. Rotator-type Exhaust Valves Engines equipped with rotator type exhaust valves see Fig. If this type exhaust valve is fitted, the overall height of the exhaust valve spring assemblies is much greater than those of thdinlet valves. In addition, the valve spring retainers on the exhaust valves are approximately flush with the valve stem ends.
The cylinder head incorporating this type of exhaust valve assembly does not have a recess for the exhaust valve spring in the cylinder head. Recesses are still provided for the inlet valve springs. These heads also incorporate solid type injector housings.
A small cap is fitted over the end of the valve stem, so that the pressure from the rocker lever is transmitted direct to the valve spring retainer and valve spring, and the valve itself is relieved of spring pressure during the working cycle.
To achieve this condition, a slight clearance exists between the valve cap and the end of the valve stem see Fig. If the clearance is insufficient, then the valve may not be relieved of the spring pressure during the working cycle, or if it is excessive, the valve may hammer on the collets and lead to excessive wear.
In service, the depth of the cap can be determined either by using a depth micrometer or by measuring the overall length of the cap, and subtracting from it the thickness of the top of the cap.
The distance from the end of the valve stem to the outer end of the collet groove should alsa be measured carefully. The difference in these two dimensions thus obtained should be between 0. With new parts the manufacturing tolerances are such that the clearances should always be within the limits specified.
After the valves have been in service for some time, a small amount can be polished off the open end of the cap if the clearance exceeds 0. Repeat for all valves. Do not stamp the heads of the valves with a centre punch, but place them with their components in a suitable container so that they may be refitted to the port from which they were removed.
A number of engines were produced having a cylinder head incorporating integral type injector housings but without rotator type exhaust valves. TrID AB. If worn beyond the limits specified at the end of thii section, the valve guides should be renewed.
These cylinder heads do not incorporate the short exhaust valve guides as do the current engines but they do have recesses for both exhaust and inlet valve springs. It is possible to fit the rotator type exhaust valve assemblies to all cylinder heads having solid type injector housings. On heads having recesses for the exhaust valve springs a valve spring recess spacer will be required for each valve spring location.
Removal and replacement of rotator type exhaust valves is carried out in the same way as the early type, except that particular care should be taken to ensure that the chamfered ends of the short valve guides do not become damaged and that rotator caps are not dislodged and dropped into the engine.
To Remove 1 Pass the rod of the valve guide remover and replacer tool No. The rialves, springs, guides and retainers should be cleaned and the valve faces and valve seatings in the cylinder head examined for signs of pitting, burning or distortion.
T o Replace 1 Pass the rod of the valve guide remover and replacer tool No. The use of the correct adaptor will ensure that the guide is correctly positioned, i. Turn the wing nut to pull the guide into its housing and continue to do so until the adaptor abuts the face of the valve spring seat on the cylinder head. Where replaceable valve inserts are fitted in the cylinder head, they can be renewed, if necessary, by following the instructions given below.
The first operation is to remove the original insert and the utmost care must be taken to avoid damage to the cylinder head.
The easiest method for removal is to position a bar through the insert so that the end locates under its lower inside edge, suitably protecting the edge of the head on which the fulcrum point of the bar rests. A smart tap on the outer end of the bar will force the insert out of the cylinder head.
A new insert should be placed in the reccss in the cylinder head, chamfered edge first. I t can then be pressed home with the aid of a driver, tool No. If not available suitable drivers can be made locally from the details given in Fig. Great care should be taken to ensure that the insert is entered squarely in its recess and an extension to the driver, to locate in the valve guide, may be found advantageous.
Peening or rolling the surrounding metal of the cylinder head over the edge of the insert is unnecessary, as the. Suitable cutters are marketed to enable the cylinder head to be machined to accept an insert where not previously fitted and also to permit an oversize insert to be fitted, should the original for any reason need renewing. The dimensions of standard and oversize inserts can be obtained from the table shown in Fig.
Remember that hand grinding is a finishing process and on no account should excessive hand grinding be attempted, otherwise the seat angles may be altered and the seat width increased excessively. Valves which are badly burned, distorted or which have been previously ground to the limits should be discarded and new parts fitted as replacements.
Always grind a replacement valve into its seating. If the condition cannot be reached, it will be necessary to reface or re-cut the valves and seats. After grinding-in the valves, carefully clean all paste and foreign matter from the seats and valves. Care should be taken when re-cutting the valve seats to ensure that too much metal is not removed.
As narrow a valve seat as possible should always be maintained. If the valve seats in the cylinder head are badly damaged, valve seat inserts should be fitted. Before re-use all the valve springs should be carefully examined, with particular attention to squareness of ends and pressure developed at the compressed lengths.
After the engine has been started up the tappets should be checked and readjusted if necessary, when the engine is running at its normal working temperanue. T o Replace the Valves Remove all traces of grinding paste and foreign matter from the valve heads and stems and from the seats and guides in the cylinder head. Oil the valve stems and guides to provide initial lubrication. Insert each valve in its correct port. T h e tappets can only be removed from the crankcase locations after the camshaft has been withdrawn.
With the cylinder head on a flat surface to support the valves, locate the valve springs in the spring retainers with the closed coils to the cylinder head. Using the valve spring compressor tool No. Remove the tool. I t is difficult to lay down any set period when it will be necessary to carry out decarbonising a diesel engine. All other factors contributing towards loss of power, etc. Adjusting the Valve Clearances After replacing the rocker shaft assembly and push rods it will be necessary to readjust the valve clearances.
With the. Carbon Removal I t is essential that absolute cleanliness is observed throughout the following operations to prevent any possibility of consequential damage resulting from particles of carbon falling into the engine and causing scoring of the cylinder bores, pistons, bearings, etc. Ensure that no b u m ace made on the machined face of the cylinder head.
This causes the grease to fill up the gap between the piston crown and the cylinder wall and prevents carbon particles from reaching the ring grooves and subsequently causing wear. On earlier production engines, copper housings are fitted in the cylinder head, the injectors being situated in these housings. T o Replace 1 Thoroughly clean out the cylinder head location, especially the recess for the rubber seal and the lower face.
Normally, it should not be necessary to remove the injector housings which are a light tap fit in the cylinder head. Should it be necessary to remove any or all of these houshgs the remover tool No. New rubber seals and copper housings should always be used as replacements.
T o carry out this operation there is no necessity to remove the cylinder head. On later production diesel engines the injector housings are cast integral with the cyliider head and a plain copper washer is used to ensure a gastight joint between the injector nozzle and cylinder head.
T o Remove 1 Drain the cooling system through the two taps, one on the radiator and one on the left-hand side of the cylinder block. I t is ,important that the tap is entered squarely otherwise diiculty may be experienced in removal of the housing. It will be necessary to support the weight of the sump as it must be lowered squarely during removal. Fit a new lower half rear oil seal. This should be previously soaked in engine oil for one hour and when fitted should protrude at its ends in.
Do not forget the split pin. Engine Oil Indicator On current tractors the engine oil indicator is used in conjunction with a steel tube pressed into the sump. It has a metal cap secured to the shank which is located over the top of the tube. A rubber seal is fitted inside the cap to exclude all foreign matter. If required in cases where early type tractors are operating under adverse conditions it is possible to convert to the latest type indicator and the following method can be adopted with the sump in situ.
Ream out the full length of the oil indicator bore in the sump to a diameter of 0. The outside diameter of the tube is 0. Dismantling, Reassembling and Testing the Pump refer to Engine Lubrication section on pages 60 and Fit the support bracket to the centre main hearing cap.
Refill the sump with clean oil of an approved grade.
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