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F rdM t rC
FORD V8 CARS & THUNDERBIRD 1955
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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
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