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Left front view of Dodge Red Ram Right front view of Dodge Red Ram

Dodge Red Ram Engine

Engine Data and Specifications ( Models D-50, D-53 )

There are two sets of data below. The difference is noted by "(MD)" whic h
represents the Dodge Meadowbrook model and "(CR)"which represents the
Dodge Coronet Royal model. Otherwise they are the same.


All Dimensions are in Inches
Accuracy of number values, has been checke d but are not guaranteed.

Engine
TypeV 90º
Valve Arrangement 53º Inclined L ateral in Head
Number of Cylinders 8
Bore 3 7/16
Stroke 3 1/4
Piston Displacement241.3 cu. in.
< /TD>
Taxable horsepower (AMA)
37.8
Maxium Brake horsepower
at 4440 rpm
140 (MD) 150 (CR)
Compression Ratio
7.1:1 ( MD) 7.5:1 (CR)
Compression Pressure
at 150 rpm ( pl ugs removed)
wide open throttle
125 to 155 (MD) 135 to 165 (CR) lb.
Maxium Variation between
Cylinders ( any one engine )
10 lb.
Firing order 1-8-4-3-6-5-7-2

Cylinder Numbering
From Drivers seat Left Bank 1-3-5-7
Right Bank 2-4-6-8

Engine Weights
Dry
Power plant assembly (Dry)
590 lb.
853 lb.

Engine Dimensions
Width ( oil filter installed )
Height ( bottom of oil pan to top of air cleaner )
Length ( back of flywheel housin g to front of FAN )
32 3/4
31
28 3/16

< TD>40 to 65 lb.
Engine Lubrication
Pump Type Rotary, Full Pressure< /TD>
Capacity (qts.) - When Filter Element
is Replaced add 1 qt.
5
Pump Drive Camshaft
Minimum Pump Pressure at 500 RPM 15 psi.
Operating Pressure at 40 to 50 MPH
Oil Filter Type Shunt Type (opti onal special equipment)
Replaceable Element Yes

Cylinder Block
Cylinder Bore ( standard) 3.4372 5 - 3.43975
Cylinder Bore Out-of Round
(max. allow able before reconditioning)
.005
Cylinder Bore Taper
(max. allowable be fore reconditioning)
.020
Reconditioning Working Limits
for Tape r and Out-of-Round
.001
Maximum Allowable Oversize .060< /TD>
Tappet Bore (diameter) .905 - .9 055
Distributor Lower Drive Shaft BushingPress fit in Block .0015 - .004
Ream to .4865 - .4875
Shaft to Bushi ng Clearance .0007 - .0022

Camshaft
Drive Chain
Bearings Steel-Backed Babbitt
Number 5
Thrust Taken By Thrust Plate
End Play .002 to .006
Maximum Allowable Before
Reconditionin g
.010
Radial Clearance .001 to .003
Maximum Allowable Before
Reconditionin g
.005

Camshaft Journals Diameter and Length
No. 1 1.998 to 1.999 x 7/8
No. 2 1.982 to 1.983 x 3/4
No. 3 1.967 to 1.968 x 3/4
No. 4 1.951 to 1.952 x 3/4
No. 5 1.4355 to 1.4365 x 15/16

Camshaft Bearings Diameter and Length
No. 1 2 x 7/8
No. 2 1 63/64 x 3/4
No. 3 1 31/32 x 3/4
No. 4 1 61/64 x 3/4
No. 5 1 7/16 x 7/8

Camshaft Chain
Adjustment None
Number of Links 68
Pitch .375
Width 1 1/8

Crankshaft
TypeFully Counterbalanced
Bearings Steel Backed Babbit
Main Bearings 5
Thrust Taken By #3 Main Bearing< /TD>
End Play .002 to .007
Maximum Allowable Before Reconditioning .010
Radial Clearance ( desired ) .00 05 to .0015
Maximum Allowable Before Reconditioning< /TH> .0025
Finish at Rear Seal Surface Knur led

Main Bearings
Bearing Sizes ( Diameter and Length) #1- 2 3/8 x 27/32
#2-2 3/8 x 27/32
#3-2 3/8 x 1 3/32
#4-2 3/8 x 27/32
#5- 2 3/8 x 1 9/16
Main Bearing (service)
Available in St andard and
the following Undersized
# 1- .001 .002 .003 .010 .012
#2- .001 .002 .003 .010 .012
#3- .001 .002 .003 .010 .012
#4- .001 .002 .003 .010 .012
#5- .001 .002 .003 .010 .012< BR>

< /TR>
Main Bearing Journals
Diameter 2.3745 to 2.3755
Maximum Allowable Out of Round . 001
Maximum Allowable Taper .001
Center Bearing Run-Out ( total indicator reading )
When Supported at Front and Rear Main Bearing
.002

< /TR>
Crankpin Journals
Diameter 1.9365 to 1.9375
Length 1 13/16
Maximum Allowable Out-of-Round . 001
Maximum Allowable Taper .001

Connecting Rods and Bearings
Type Drop Forged I Beam
Length (center to center) 5.9335 - 5.9375
Weight (less bearing) 600 grams< /TD>
Bearings Steel Backed Babbitt
Diameter and Length 1 15/16 x 13 /16
Radial Clearance Desired .0005 t o .0015
Maximum Allowable Before Reconditioning .0025
Side Clearance .006 to .014
Bearings for Service Standard, . 001, .002, .003,
.010, .012 U.S.

Connecting Rod Bushing
Type Steel Backed Bronze
Number of Bearings 8
Diameter and Length 35/64 x 1 1/ 8

Pistons
Type T Slot with Steel Band
Material Aluminum Alloy Tin Coat ed
Clearance in Bore (pounds pull with
. 0015 x 1/2 feeler stock)
5 to 10 lb.
Land Clearance (in bore) .027 - .033
Clearance Top of Skirt .00075 t o .00175
Weight (Standard through .060 oversize) 462 - 466 grams
Piston Length (overall) 3 17/64< /TD>
Ring Groove Width Upper &n bsp;            .0795 - .0805
Intermediate  .0790 - .0800
Lower    &n bsp;  &n bsp;      .1875 - .1890
Pistons for Service Standard, .0 10, .020, .030, .040, .060, o.s.

Piston Pins
Type Floating
Diameter and Length .8591-.8593 x 2.880-2.890
Clearance in Piston (thumb press at 70 86; F.) .0000 to .0005
End Play .003 to .029
Clearance in Rod (selective) .00 01 to .0004
Piston Pins for Service Standard , .003, .008 o.s.

Piston Rings
Number of Rings per Piston 3
Compression Rings 2
Oil Rings ( with expander) 1
Width of Ring Upper  & nbsp;           .0775 - .078 0
Intermediate  .0775 - .0780
Lower     & nbsp;  & nbsp;     .1860 - .1865
Expander               .1785-.1825
Piston Ring Gaps .007 to .015
Ring Side Clearance Upper & nbsp;            .0015 - .0030
Intermediate  .0010 - .0025
Lower    & nbsp;  & nbsp;      .0010 - .0030

Tappets
Type Hydraulic
Clearance in Block .0005 to .001 5
Body Diameter .9040 to .9045
Clearance Between Valve Stem
and Rocke r Arm (Dry)
.060 to .210

Valves - Intake
Head Diameter 1 21/32
Length (to top of valve face) 4 13/16
Stem Diameter .372 to .373
Stem to Guide Clearance .001 to .003
Maximum Allowable .004
Face Angle 45º
Lift .360

Valves - Exhaust
Head Diameter 1 13/32
Length (overall) 4 3/4
Stem Diameter .371 to .372
Stem to Guide Clearance .002 to .004
Maximum Allowable Before
.00 6
Face Angle 45º
Lift .364

Valve Guides
Length ( intake and exhaust ) 2 19/32
Press Fit in Head .001 - .003
Valve Seat to top of Guide Intak e - 15/16
Exhaust - 1 3/32
Ream after Installation Intake - .374 - .375
Exhaust - .374 - .375
Install Exhaust Valve Guide with Oil Hole Toward Intake Guide.

Exhaust Valve Seat Inserts.
Seat Angle 45º
Seat Wiudth .040 - .060
Press Fit in Head .002 - .004

Head
Valve Springs - Outer
Number 16
Free Length 2 1/32
Pressure (When Compressed to 1 11/16) Val ve closed 38 to 43 lbs.
Pressure (When Compressed to 1 5/16) Valv e open 100 to 110 lb.
Assemble with Closed Coils Toward
Valve Spring ID .990 to 1.010
Maximum Allowable Out-of-Plumb1/1 6
Valve Spring Installed Height (spring seat to retainer)
*Use 1/16 spacer to reduce spring height (when over 1 11/16)
1 5/8 - 1 11/16

Valve Springs - Inner
Number 16
Free Length 2 1/64
Pressure (When Compressed to 1 9/16) Valv e Closed 20 to 23 lbs.
Pressure (When Compressed to 1 3/16) Valv e Open 40 to 45 lbs.
Valve Spring ID .690 to .710
Maximum Allowable Out-of-Plumb1/1 6
Valve Stem Assembled Length (stem tip to s pring seat)
1 29/32 - 1 31/32

244º
Valve Timing
Position of No. 1 Piston with Respect to Block at TDC .017 Above to .008 Below
Intake Opens (BTDC) 17º
Intake Closes (ABDC) 47º
Exhaust Opens (BBDC) 55º
Exhaust Closes (ATDC)
Valve overlaps 26º
Intake and Exhaust Valve Duration

Cylinder Head
Number Used 2
Combustion Chamber Hemispherical
Valve Seat Run-out (maximum) .00 2
Valve Seat Out-of-Round .0005
Intake Valve Seat Angle 45º ;
Seat Width (finished) .060 to .0 85
Exhaust Valve Seat Angle 45º ;
Seat Width (finished) .040 to .0 60
Cylinder Head Gasket (thickness) .075 (MD) .055 (CR)

Rocker Shaft Assembly
Clearance Between Rocker Arm and Tube .001 - .002
Clearance Between Rocker Tube and Bracket .0007 - .0027
Clearance Between Valve Stem and Rocker A rm (Dry) .060 - .210
Pressure Lubricated Yes (metered )


The connecting rod nuts, bearing cap bolts, cylinder head bolts
and spark plugs should be very carefully hand torqued.

< /TR> < /TR>

< /TR>
Tightening Reference - FOOT POUNDS
Camshaft sprocket hub nut 125
Camshaft sprocket hub thrust plate bolt 15
Carburetor to manifold stud nut 15
Chain case cover bolt 15
Clutch housing bolt (small) 30
Clutch housing bolt (large) 45
Clutch housing pan bolt 15
Connecting Rod Bearing Cap Bolt nut 45
Cylinder head bolt 85
Distributor clamp bolt 15
Engine front support insulator bolt 20
Engine front support bolt 45
Exhaust manifold stud nut 25
Exhaust pipe flange bolt nut 40< /TD>
Fan blade bolt 15
Flywheel housing to cylinder block bolt 50
Fuel pump bolt 30
Generator adjusting strap bolt 1 5
Generator adjusting strap mounting bolt 30
Generator bracket bolt 50
Generator mounting bolt 20
Intake manifold bolt 30
Main bearing cap bolt 85
Oil filter bolt 25
Oil pan bolt 15
Oil pan drain plug 35
Oil pump cover bolt 10
Oil pump mounting bolt 35
Spark plugs 30
Crankshaft pulley hub bolt 135
Water outlet elbow bolt 30
Water pump body bolt 30
Water pump housing bolt 30

Tightening Reference - INCH POUNDS
Crankcase ventilator outlet pipe bolt 15
Manifold heat control counterweight bolt< /TH> 50
Rocker cover stud nut 30
Rocker cover bolt 30
Tappet chamber cover bolt 50
Ignition cable cover bolt 85



Tightening Reference



Frank Tomjack

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Created 28/Dec/96