Perkins L4 Workshop Manual - L-36 Fleet

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1 , Cylinder Head ..\-faintenance-eontinued Should it be necessary to remove these covers ncw copper joints should be fitted when they are replaced. lf ncw copper joints are not available the old unes may be used provided they are softened before being re-fitted. To soften the joints heat them to a dull red heat and quench in cold water. Special care is necessary when refitting these covers to ensure that there are no leaks at the joints otherwise there will be a loss of compression and the efficiency of the engine -:vill be impaired. Re-assembly Cylinder Head. Replace valves, valve springs, collars and collet~. Replace combustion chamber caps and joints. Fit exhaust manifold gaskets and exhaust manifold. Replacing Cylinder Head. Before replacing cylinder head it is extremely important to ensure that the cylinder block and cylinder head races are perfectly clean. When replacing the cylinder head a new gasket should be used. Cover both sides with a thin coating of good jointing compound and before placing over the cylinder head studs ensure that the gasket is correctly positioned. The gasket is marked to indicate hcw it should be replaced. Having placed the gas ket in position ensure that the cylinder bead face is perfectly clean and place in position over the cylinder head studs. [J.- @~6 2~ ." Page H3 To tighten the cylinder head Duts, a torque wrench should be used, set to the tension given in Section B, and pulled down in the order marked in Fig. H.3. With tb. push rods in position replace tbe rocker shaft assembly. Examine the oil pipe union and ensure that it is in good condition. Connect union to cylinder head. Where necessary, re-connect the pipe from the pneumatic governor to the venturi. Replace atomisers (See Section S). Replace leak off pipes and cold starting equipment. For fitting of fuel pipes see Section S. Valve Clearance. Valve clearances should be set to .010 in. (.25 mIn) When adjusting valve clearances the engine should he turned to bring the respective pistons to T .D.C. on compression. To adjust, slacken the lock nut and with a .010 in. (.25 mm) feeIer gauge between the top of the valve stem and the rocker lever face, turn the adjusting screw by means of a screwdriver until the correct clearance is obtained. Tighten the lock-nut. STARTING THE ENGINE Proceed as instructed in Section C. Af ter warming up, tbe engine should be sbut down and the cylinder head Duts again tightened witb a torque wrench, set to the tension given in Section B. The nuts should be tightened in the order shown in Fig. H.3. Re-set valve clearance to .010 in. (.25 mm). Tbe cylinder head cover cao aow be replac~d. A ncw joint should be fitted and care should b~ taken to sec that it is correctly positioned § '-;;;;' Fig. H3. Diagram showing order in which cylinder head nut.! must bc tightened
u Fig. ~- , . i u- The pistons are of light alloy, with fully floating gudgeon ping, which work in the bush fitted to the connecting rod small end. The gudgeon ping are held in position by means of circlips. The pistons are fitted with three compression rings, and two oil control or scraper rings. The top compression ring is a plain compression ring, the second achrome plated compression ring and the third is composed of four laminated rings. (See fig. J .2). The tourth and fifth rings are slotted scrapers. Pistons are numbered from 1 to 4 commencing with No. lat the front of the engine. Each connecting rad and cap are also numbered I and I, 2 and 2, etc. (See fig. J.1). The connecting rad and .cap mating faces are serrated la ensure correct positioning and should on no account be filed. l1 ~, J.1. Showing marking of connec- To Remove Pistons and Connecting Rod Assemblies. Remove cylinder head assembly (see Section H). Remove sump (see Sect. P). Remove IubricatingoiJ pump (see Section P). Turn engine until two conn. ecting roos are at bottom centre. then re move setscrews and locking washers. Remove caps and hearing shells. Push piston and connecting rad out of the top of the cylinders. . d Turn engine until remaining mg ro s. connecting rods are at bottom centre. then repeat removal operations. Should there be carbon ridges in the cylinder aDres. remove them. using a scraper for the purpose. Page 11 Keep each piston and connecting rad assembly separate. each to each as marked. To Remove Gudgeon Pins. Remove circlips trom the piston. using long nosed pliers. Ta remave the gudgeon pins. warm the pistons in liquid to a temperature of loooF.-120oF. (38°-49°C.). The pins can then be pushed out. To Fit Small End Bushes. Remove piston and connecting rad from engine. Remove gudgeon ping (see above). The small end bushes are a press fit into the connecting rods. Press out aId bush with suitable press Remove any sharp edges around smal! elld parent bare. Press in new bush. ensure that oiI hole Ul bu:ih coincides with hole in top of connecting rad. Ream out new bush to guit gudgeon pin (see Section V) and check for parallelism. To Assembie Piston and Connecting Rod. Insert gudgeon pin into position. to do this it may be necessary to heat piston in liquid to a temperature of looo-120oF. (38°-49"C.). The gudgeon pin can then be pushed easily into position, Tf original pistons are bejag used they must be re-assembled to the same connecting rods. e.g. piston stamped I must go with connecting rad stamped with the figure 1. For markings of connecting rad see fig. J .1. Fit circiips. check to ensure that they fit correctly into the grooves in the piston. Tt is advisable to fit new circiips even if the oid ODes do not appear to be damaged or strained. Fittings New Rings. Pistons and rings must be thoroughly washed to remove any oil or grease which may be present.
Page 1 and 2: u u u ...J J Perkins Engines Peterb
Page 3 and 4: Page IV All threads used on the L4
Page 5 and 6: 1 J -, " l 1 1 -, -.J ..,.j .., ...
Page 7: INDEX TG ENGINE PHOTOGRAPHS I. Brea
Page 15 and 16: Page B2 Details of Industrial engin
Page 17 and 18: Page C2 Starting the Engfne-cantinu
Page 19 and 20: 1 DIFFICULT STARnNG No Foei at Atom
Page 21 and 22: 1 1 J DO KEEP THE ENGINE CLEAN. AND
Page 23 and 24: Page F2 PRESERV AllON OF LAID UP EN
Page 25 and 26: -J J J J FILTERS A prime considerat
Page 27 and 28: 1 Filters-continued Pa1!e G3 Fig. G
Page 29 and 30: 1 1 ., Filters-continued rage G5 Fi
Page 31: Page H2 Cylinder Head Maintenance-c
Page 35 and 36: ~ l Pistons and Connecting Rods-con
Page 37 and 38: ~ , Page L 1 -.. ., -,. -, ..., -,
Page 39 and 40: ~ . -,. ~ " ,., J, Crankshaft and M
Page 41 and 42: 1 .., TIMING (N NOTE.- When checkin
Page 43 and 44: ~ ~ 1 .., -; J ..., -J ~ I - .., Ti
Page 45 and 46: Page P2 The OU Pressure Relief Valv
Page 47 and 48: ~ Page P4 Assembie idler gear, pump
Page 49 and 50: 1 ! 1 u Paee u W A TER PUMP(Q) ] ]
Page 51 and 52: u Page u u u u ~ J pump body and pu
Page 53 and 54: I U u Page SI u FUEL SY STENl (S) T
Page 55 and 56: ~ . .., - .., u ~ ~ 1 J ] Fue/ lnje
Page 57 and 58: , u u Page in u J J ] , .., ., ...
Page 59 and 60: . . ~- Pag~ .., Iel InjectÎon Syst
Page 61 and 62: ~ t ~ 1 u ., 1 1 J Fuel Injection S
Page 63 and 64: . ~. . u ~ , u u u u u u u J J J Fu
Page 65 and 66: . L: ~ 1 u u gj;;::;"~ Fuei [njecti
Page 67 and 68: ] J ] - - ~ = ~ °- " -- w '< ." ~
Page 69 and 70: Page T2 .\{ echanica/ Governor-cont
Page 71 and 72: faze U2 to tbe cranksbaft flange, a
Page 73 and 74: Page V2 SCHEDULE OF BunnING CLEARAN
Page 75 and 76: Page V4 SCHEDULE OF BUn.DING CLEARA
Page 77 and 78: . c Settings ""'Oc ..., L4 MARINE (
Page 79 and 80: u uuI ' u u ~ u u u u u u u u u L4
Page 81 and 82: J . 1.4 MARINE EN G INEs- W . 5 ~ y
Page 83 and 84:
316-125 VaJve Seat Cutter Pilot Eng
Page 85:
1 ] 1 ~l J y '1 ~ ~~ y < ~-.., f- Z
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Perkins L4 Workshop Manual - L-36 Fleet

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