Fiat Uno 1983-1995 Workshop Repair & Service Manual (COMPLETE & INFORMATIVE for DIY REPAIR) ☆ ☆ ☆ ☆ ☆
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This highly detailed workshop service repair manual for download contains virtually everything you will ever need to repair, maintain, rebuild, refurbish or restore Fiat Uno 1983-1995. All diagnostic and repair procedures and gives you access to the same information that professional technicians and mechanics have. You can view and print out the complete repair procedures with this workshop service repair manual Download - you do not need to be skilled with a computer.
26 Check the clutch mating surface of the flywheel. If it is deeply scored (due to failure to
renew a worn driven plate) then it may be possible to have it surface ground provided
the thickness of the flywheel is not reduced too much.
27 If lots of tiny cracks are visible on the surface of the flywheel then this will be due to
overheating caused by slipping the clutch or riding the clutch pedal.
28 With a pre-engaged type of starter motor it is rare to find the teeth of the flywheel ring
gear damaged or worn but if they are, then the ring gear will have to be renewed.
29 To remove the ring gear, drill a hole between the roots of two teeth taking care not
to damage the flywheel and then split the ring with a sharp cold chisel.
30 The new ring gear must be heated to between 180 and 220ºC (356 and 428ºF) which is very hot, so if you do not have facilities for obtaining these temperatures, leave the job to your dealer or engine re-conditioner.
31 Where such facilities are available, then the ring gear should be either pressed or lightly tapped gently onto its register and left to cool naturally, when the contraction of the metal on cooling will ensure that it is a secure and permanent fit. Great care must be taken not to overheat the ring gear, as if this happens its temper will be lost. A clutch input shaft pilot bearing is not fitted on this engine.
32 Examine the camshaft bearings for wear, scoring or pitting. If evident then the bearings will have to be renewed. The three bearings are of different sizes and they can be removed and new ones fitted using a bolt, nut and distance pieces. When drawing a new bearing into position, make sure that the oil hole is correctly aligned with the one in the crankcase. The centre and rear bearings require reaming after fitting, the bearing at the timing chain end is supplied ready reamed
33 The camshaft itself should show no marks or scoring on the journal or cam lobe surfaces. Where evident, renew the camshaft or have it reprofiled by a specialist reconditioner.
34 Check the teeth of the camshaft sprocket for wear. Renew the sprocket if necessary.
35 Examine the bearing surface of the cam followers which are in contact with the camshaft. Any indentations or cracks must be rectified by renewal. Clean sludge and dirt from the cam followers and check their fit in their bores. Side to side rock is unusual except at very high mileage.
36 Examine the teeth on both the crankshaft sprocket and the camshaft sprocket for wear.
Each tooth forms an inverted V with the sprocket periphery and if worn, the side of each tooth under tension will be slightly concave in shape when compared with the other side of the tooth, ie; one side of the inverted V will be concave when compared with the other. If any sign of wear is present the sprockets must be renewed.
37 Examine the links of the chain for side slackness and particularly check the self-tensioning links for freedom of movement. Renew the chain if any slackness is noticeable when compared with a new chain. It is a sensible precaution to renew the chain at about 60,000 miles (96,000 km) and at a lesser mileage if the engine is stripped down for a major overhaul.
38 This is covered in Section 17. Rockers and rocker shaft
39 Thoroughly clean out the rocker shaft. As it acts as the oil passages for the valve gear, clean out the oil holes and make sure they are quite clear. Check the shaft for straightness by rolling it on a flat surface. If it is distorted, renew it.
40 The surface of the shaft should be free from any wear ridges caused by the rocker arms. If it is not, the shaft will have to be renewed. Blocked shaft oil holes often contribute to such wear.
41 Check the rocker arms for wear of the rocker bushes, for wear at the rocker arm face which bears on the valve stem, and for wear of the adjusting ball ended screws. Wear in the rocker arm bush can be checked by gripping the rocker arm tip and holding the rocker arm in place on the shaft, noting if there is any lateral rocker arm shake. If any shake is present, and the arm is very loose on the shaft, remedial action must be taken. It is recommended that a worn rocker arm be taken to your local FIAT agent or automobile engineering works to have the old bush drawn out and a new bush fitted (photo).
42 Check the tip of the rocker arm where it bears on the valve head, for cracking or serious wear on the case hardening. If none is present the rocker arm may be refitted. Check the pushrods for straightness by rolling them on a flat surface.