428 F rdM t rC FORD V8 CARS & THUNDERBIRD 1955 CONTINUED FROM PRECEDING PAGE PISTON PINS Floating type with lock rings at each end. Diam t r-.9120-.9123". L ngth-3.016--3.030". Pin Fit in Piston-Hand push fit at 70°F. Pin Fit in R d Bushing-.0001-.0003" clearance. New pin should not fall through of own weight. R plac m nt Pins: Standard size, .001", .002" Oversize. PISTON RINGS Ring Width End Gap Side Clearance Compr. #1 3/32" 010-.027" 002-.0035" Compr. #2 3/32" 010-.027" 002-.0035" Oil 3/16" 010-.027" 0015-.003" R plac m nt Rings: Standard size, .020", .030", .040", .060" Oversize. •-REPLACEMENT PISTON RING NOTE: "Snap type" rings furnished in standard size only, "Steel section type" in all above oversizes. CONNECTING RODS Crankpin J urnal Diam t r-2.1880-2.1888". L wer B aring-Steel backed, copper lead alloy lined type. Upper and lower halves interchangeable. CI aranc -.0008-. 0027". Sid CI aranc -.006-.016" (two rods). R plac m nt B arings: Standard size (4 sizes marked r d & blu for selective fitting) and .010", .020", .030" Undersize. Installing R ds: Rod bearing lock slot in rod should be toward outside of engine "V". When installing rod and piston assembly in engine indentation on top of piston head should be to front of engine, and numbers on rod and cap should be to left (left bank) and to right (right bank). CRANKSHAFT J urnal Diam t r-2.4980-2.4988". Max. wear limits .0015", taper .001". B arings-Steel backed, copper lead alloy lined. R plac ment B arings: Standard size, (4 sizes marked r d & blu for selective fitting) and .010", .020". .030" Undersize. End Thrust: Taken by No. 3 main bearing. Replace bearing if endplay excessive. Thrust B aring Alignm nt-See "Crankshaft & Main B arings" in Ford Special Data. Endplay-.002-.006". Crankshaft R ar Oil Seal Installation: See "Crankshaft •*$ Main B arings" in Ford Special Data. Crankshaft Fr nt Oil S al Installation: See "Engine Front Cov r" in Ford Sp cial Data. CAMSHAFT J umal Diam t r-1.9255"-1.9265" (new), l.924"(worn limit). Clearanc —001-.003" (new), .005" (worn limit). End Thrust: Taken by plate on forward end of block (between camshaft sprocket and shoulder ort block). Endplay-.003-.007". R plac m nt Camshaft Bearings: Finished bearings furnished Standard, .015" Undersize. CAUTION-OH holes in b arings must b I'm d up c rr ctly. S Ford Sp cial Data. Camshaft R m val - S Ford Sp cial Data. "Camshaft & B arings" in Valv Guid s: Integral with cylinder head. When stem-toguide clearance exceeds maximum (See table above), timing Chain: Side-guide type. Length 56 links. ream guides and install oversize valve. S "Valv Guides" in Ford Special Data. •-REPLACEMENT NOTE: Replace chain and sprockets when deflection on slack side exceeds Yi" (take up all Valve Lifters: Mushroom type. Removed from below with slack on driving side, measure slack on opposite side). camshaft removed. -VALVE LIFTER INSTALLATION CAUTION: Cast iron •-CAMSHAFT SPROCKET SPACER INSTALLATION tappet, Part No. EAA-6500-C, should no longer be CAUTICN: If spacer, Part No. EBE-6265-A, installed used as service replacement on 8-cylinder engines as backwards, it will allow an excessive amount of endthese tappets may contribute to cam lobe wear. Use play. Inside diameter of spacer has a chamfer on one steel tappet, Part No. EAA-6500-D. Cast iron tappet side and this chamfered side should be installed tohas smooth molded appearance on unmachined portion ward No. 1 camshaft bearing journal. of tappet foot. Tappet foot is .220" thick. Steel tappet Camshaft Setting: Sprockets marked by "O" at one tooth. has forging marks on outer edge of tappet foot and is Mesh chain so that there are 12 pins between "O" .140" thick. mark s. Engine Front Cover Oil Seal (Crankshaft Front Seal) Installation: See "Engine Front Cover" in Ford Special Data. VALVES •-EXHAUST VALVE STEM DIAMETER CHANGE (Production & Service Replacement Valves): Stem diameter decreased .0005" for greater stem clearance in guide. See "Valve System" in Ford Special Data. Tappet Clearance: .019" (Intake & Exhaust), with engine at normal operating temperature. NOTE-Valve tappet clearance on truck engines is different. Tappet Adjustment-See "Valve System" in Ford Special Data. Valve Head Diam. Intake Exhaust Valve Stem Diam.© 1.785" 1.515" S eat Angle 3415" 3405" Lift© Length 5.02" 5.02" Stem Clearance Intake .45° 345" 002" max. Exhaust 45° 345" .._ 003" max. ©—Valves furnished with .003", .015", .030" oversize stems for service replacement. See "Valve Guides" in Ford Special Data. ©—Minimum lift for checking camshaft lobe wear. Valve Seat Width-.060-.070" (Intake). .070-.080" (Exhaust). •ROT AT ABLE VALVE NOTE: All valves are rot a table type. See "Valve System" in Ford Special Data. Valve Stem Oil Seals-"Umbrella" type oil seals used on intake & exhaust valve stems. Seals are installed with cupped side down on valve stem at guide,boss on cylinder head. Install new seals whenever valves removed or when seals become loose on valve stems. •-VALVE STEM OIL SEAL PRODUCTION CHANGE & INSTALLATION CAUTION: New valve stem oil seal (Part No. B5A-6571-A) is being installed in production and is available for service. Skirt length has been increased .100" to seal a greater area of valve stem from oil splash. Also, seal will minimize amount of oil permitted to enter combustion chamber via stem-tovalve guide clearance. When servicing engines with old type seal, new seal should be used. Valve Springs: Install with closed coil end toward cylinder head. Free Length-2.11-2.13". Valv Spring Sp cificati ns Pr ssure Valve Closed Valve Open.- 54-62 lbs 124-140 lbs L ngth 1.821" 1.505" Rocker Arm Assembly: See "Valve System" in Ford Special Data. VALVE T I M I N G See "Camshaft Setting" under CAMSHAFT above. •-VALVE TIMING NOTE: The following valve opening and closing points are with camlift as indicated. Intake Valves-Open 12° ©BTDC. Close 54° ©ALDC. Exhaust Valves-Open 58° 3)BLDC. Close 8° ©ATDC. ©-Camlift .016"." ©-Camlift .019". ©-Camlift .014". ©-Camlift .018". Valve Timing Check: See "Camshaft Setting" und r CAMSHAFT above. Remove right-hand rocker chamber cover. Turn engine over until No. 1 intake tappet is on heel of No. 1 intake cam lobe. Back off No. 1 intake valve adjusting screw push rocker arm to one side, then install dial indicator. Zero dial indicator, then rotate engine slowly until desired lift (.016") obtained. Compare degrees on pulley with specifications (12°). If not within specifications check for bent timing pointer by bringing No. 1 piston to TDC and see if timing pointer aligned with TDC mark on crankshaft pulley. If pointer not at fault, check timing chain, camshaft sprocket, camshaft, crankshaft pulley, and crankshaft in order of accessibility. O I L I N G SYSTEM -ENGINE OILING SYSTEM: See "Engine Lubrication" under OILING SYSTEM in Ford Special Datd. Crankcase Capacity: 5 qts. (refill). Add 1 qt. when filter changed. Norrhal Oil Pressure: 45-55 lbs. at 30-40 MPH. Pressure Regulator Volve-In pump body,not adjustable, Oil Pressure Indicator-Indicator light on instrument panel, operated by Engine Unit-Ford No. FDA-9278-A (Stamped No. 7 on Hex.). Lights when ignition switch turned on, goes out when engine starts. Oil Pump: Gear type pump located on- left side of engine crank-case, driven by distributor drive gear. Pump Overhaul-See "Oiling System" in Ford Special Data. •-OIL PUMP LEAK CORRECTION: On some oil pumps, oil pump cover bolt holes may be tapped into gear cavity of pump causing oil-leak past threads and out between bolt and pump cover. To correct, remove cover bolts. Coat threads of t o l t s with Sealing Compound, Part No. 8A-19554-B. Install bolts. •OIL PAN-TO-PUMP TUBE SEAL INSTALLATION CAUTION: Pump failures have been encountered due CONTINUED ON NEXT PAGE
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