How To Rebuild Your Ford V-8 351C-351M-400-429-460.pdf - Index of

More documents

Recommendations

Info

I I Pop-up '71 351C Boss piston and flat-top '72 HO piston give compression ratios of 11.3:l and 9.2:1, respectively. Both are forged, whereas standard pistons are cast. Piston at right is TRW's forged version of the standard 351 C cast piston. forged for added strength. Additionally, the Boss uses a pop-up type 1 1.3 : 1 piston. A pop-up, or dome is a lump formed into the piston top to reduce combustionchamber volume for increased compression. The '72 HO, a low-compression version of the '7 1 Boss, uses a flat-top forgedaluminum 9.2:l piston. It is similiar in appearance to the cast version of the 351C piston. 351M/400-351M and 400 pistons are cast-aluminum, fit the same diameter bores and are flat-top with two valve reliefs. The major difference is compression height, the distance from the wristpin-bore center to the top of the piston. Compression height for the 351M is 1.947 inches. The 400 is shorter at 1.647 inches to compensate for its longer stroke. As a result, these pistons are not interchangeable. Remember, the 351M and 400 engines use the same connecting rods. Consequently, a 351M piston installed in a 400 would stick out the top of its bore or crunch against the bottom of the cylinder head as the piston approaches TDC. On the other hand, a 400 piston installed in a 351M would stop far short of the top of its bore at TDC and would hit the crankshaft at the bottom of the stroke. 429-2V, 4V and 4604V-The 4291460 piston description is similar to that of the 351M1400. They are cast-aluminum, fit the same bores, have two intake-valve reliefs and have different compression heights. 429 and 460 engines also use the same connecting rod. The 460's pistons are dished to achieve the desired compression ratio. I'll discuss how an engine's compression ratio is determined later. 429 CJ, SCJ, Police and 460 Police-Other than the 460 Police, 429, CJ, SCJ and Police pistons differ from the standard piston. The 460 Police engines use conventional passenger-car pistons, 429 CJ and Police-car pistons are cast as originally installed, however their design differs from that of the standard 429 piston. Rather than having two intake-valve reliefs, 429 CJ, SCJ and Police-car pistons have one valve relief. Consequently, an originally installed piston must be installed in the same cylinder bank it came in because it has an offset wrist pin-the pin centerline is 0.0625 inch to the right of the piston center-line. This means the piston can't be turned around to clear the intake valve for installing in the opposite bank as is possible with a piston having no pin offset. Fortunately, all 429 CJ, SCJ and Police service pistons are manufactured without this offset making it possible to install the piston in either direction. Ford services the CJ and 429 Police piston with the SCJ piston. Its design is the same with one major exception-it's forged. CRANKSHAFT, ROD AND PISTON MATCHING What if you're replacing your connecting rods, pistons and crankshaft with those from another engine Some interchanging is possible due to the 35 1 M/400s and the 4291460s using the same blocks, however this is about it. To do any interchanging, you must be aware of the basics. Otherwise, you can end up with a basket of expensive junk. For instance, crankshaft throw, connecting-rod center-to-center length, piston compression height and deck clearance must be compatible with the block's deck height. For a given stroke crankshaft, a longer rod will cause a given piston to operate higher in its bore. A shorter rod would cause the same piston to operate lower in the same bore. Piston compression height is very important here because of the 351M1400 and 4291 460 situations. As compression height is increased-the pin bore is moved down in relation to the piston top-the top of the piston will operate higher in the cylinder bore. Reducing compression height moves it down. The last item, deck clearance, is simply the measurement from the piston top at TDC to the block deck or cylinderhead gasket surface. This clearance is necessary to prevent a piston from hitting the cylinder head. The question is, "How does all this relate to swapping parts" The sum of the crankshaft throw, connecting-rod length and piston compression height must not exceed a block's deck height, otherwise serious engine damage will result. This is particularly true if it is exceeded by more than the specified deck clearance. In this case the piston will come higher than the deck surface and impact against the cylinder head. On the other hand, if the sum is considerably less, you'll have a very underpowered engine due to a too-low compression ratio. One final and vital factor that must be considered when changing bottom-end components is balance. You don't want undue engine vibrations. Chances are this won't be a problem as the components that can be interchanged are balanced to work with each other, however it certainly wouldn't hurt to have bottom-end components checked for proper balance. This is particularly important in high-performance applications. Many engine machine shops are equipped to do this, and at very reasonable prices. VALVE-TRAIN DESIGN Variations in 335 and 385 valve trains are restricted mostly to the rocker-arm designs and how they are stabilized, or guided. To operate a valve, a rocker arm must rock only in the plane of the valve stem and the pushrod. Ford uses two basic rocker-arm styles and guides them in three different ways. Valve-Stem-Guided-1968-71 4291460s are the only 3351385 engines using valvestem-guided rocker arms. The rocker-arm pivot or fulcrum is spherical at its rockerarm contact surface. Consequently, the only thing keeping the rocker arm from pivoting in all directions is the rockerarm rails, thus the name rail-type rocker
CK CLEARANCE) (COMPRESSION D (DECK HEIGHT) (CONNECT1 NG-ROD LENGTH) T (CRANK D d H L T 351C 70-74 9.206 0.035 1.650 5.780 1.750 351C Boss 71 9.206 0.045 1.631 5.780 1.750 351C H.O. 72 9.206 0.019 1.657 5.780 1.750 351M 75-80 10.297 0.016 1.947 6.580 1.750 400 71-80 10.297 0.565 1.650 6.580 2.000 68.70% 10.300 0.010 1.890 6.605 1.795 429 70% 10.310 0.020 1.890 6.605 1.795 72-80 10.322 0.032 1.890 6.605 1.795 429CJ & SC J 70-71 10.300 0.010 1.890 .6.605 1.795 68.70% 10.300 0.010 1.760 6.605 1.925 460 70% 10.310 0.020 1.760 6.605 1.925 72-78 10.322 0.032 1.760 6.605 1.925 Crankshaft throw, connecting-rod length, and piston compression height must add up to no more than a block's deck height, otherwise serious engine damage will result. When interchanging parts, use accompanying chart to make sure your engine will have sufficient deck clearance. ARM arm. Flanges cast into the end of the Be wary of using worn valves and railrocker arm straddle the valve-stem tip. type rocker arms in your engine. If the FULCRUM This restricts lateral rocker-arm move- rails are close to the retainer-0.060 inch ment. The problem with this set-up is or less-don't take chances. Replace the additional loads are put on the valve-stem rocker arm and its valve. tip, the valve guide and the rocker arm. Pivot-Guided-Beginning with the 351C As a result, all wear a bit more than in 1970, all except tlie high-performance normal. Rather than the guide wearing versions of the 335 and 385 engines use toward and away from the fulcrum due pivot-guided, stamped-steel rocker arms. to the normal sliding motion of the Rather than using a ball, or spherical fulrocker-arm tip against the valove-stem tip, crum, a cylindrical-shape pivot is used. it also wears sideways, or 90 to normal This restricts the rocker arm so it pivots guide wear. around one axis or in a single plane-the As rocker arm and valve-stem tip wear, plane of the valve stem and pushrod. To the rails get closer to the valve-spring re- do this, the pivot must also be restricted 1968-71 429/460 rail rocker arms are tainer. This doesn't present any particular from moving. This is accomplislled by stabilized by rails which straddle their problem until the rails begin to bear on registering the fulcrum in a notch in the valve tips. These are the Only rocker arms the retaiiler. When this occurs, the retainer cylinder-l1ead rocker-arm pedestal and in 335 and 385 engine series which are cast-iron and use spherical fulcrums. Note keepers are unloaded and can be released, securing it with a bolt through the center also, the positive-stop stud. Drawing cour- letting the valve drop into its cylinder. of the pivot. Consequently, the rocker tesy Ford. Severe engine damage usually results. arm cannot be adjusted, but this is not
Page 1 and 2: HPBooks How to find out what needs
Page 3: Introduction This book deals with r
Page 6 and 7: DIAGNOSIS home and dumping the "ins
Page 8 and 9: A complete, high-quality tune-up ki
Page 10 and 11: may be causing the problem at this
Page 12 and 13: ect, particularly if there appears
Page 14 and 15: To ensure that your hood will fit a
Page 16 and 17: Radlators can be heavy like this bi
Page 18 and 19: emove the compressor and have a sys
Page 20 and 21: ENGINE REMOVAL 19 - i When jacking
Page 22 and 23: ENGINE REMOVAL 21 After starter-mot
Page 24 and 25: get on with the physical makeup of
Page 26 and 27: Cylinder-block, cranksharr an0 cy~~
Page 28 and 29: When sifting through your local scr
Page 30 and 31: 351C Boss, '71 CJ, HO '72-74 4V CYL
Page 34 and 35: pushrod-guided aspect comes in. Thi
Page 36 and 37: PARTS 35 Compression ratio is deter
Page 38 and 39: 4291460-Standard 429 and 460 cylind
Page 40 and 41: Tearing down your engine is the fir
Page 42 and 43: Remove engine-lifting lugs and exha
Page 44 and 45: You'll need a puller to remove the
Page 46 and 47: cam sprocket and chain, and then th
Page 48 and 49: them; they'll tell you a story. Bea
Page 50 and 51: If you are removing your cam bearin
Page 52 and 53: 5 Inspecting and Reconditioning the
Page 54 and 55: After you've cleaned out the head-
Page 56 and 57: 0.020 inch, the next available over
Page 58 and 59: Checking deck-surface flatness with
Page 60 and 61: Cross-hatch pattern of a freshly ho
Page 62 and 63: If you don't have a snap gage, here
Page 64 and 65: Using grease and some machined roun
Page 66 and 67: while your micrometer is handy, do
Page 68 and 69: When measuring piston diameter, do
Page 70 and 71: Using a piston ring and a feeler ga
Page 72 and 73: Five- and four-plate timing chains
Page 74 and 75: New oil-pump drive shaft above and
Page 76 and 77: CYLINDER-HEAD RECONDITIONING 75 If
Page 78 and 79: anything from a cardboard box to a
Page 80 and 81: CYLINDER-HEAD RECONDITIONING 79 . .
Page 82 and 83:
The K-Line bronze valve-guide inser
Page 84 and 85:
will be sealed the first time the v
Page 86 and 87:
or 68 lbs. in this case. If a sprin
Page 88 and 89:
Uslng a short sectlon of wlre cut a
Page 90 and 91:
Except for rocker arms and fulcrums
Page 92 and 93:
This is the part of engine building
Page 94 and 95:
.,., ....., ,. ,., .,. . .,. differ
Page 96 and 97:
If you are installing a new or regr
Page 98 and 99:
BEARING-CLEARANCE CHECKING ROTATING
Page 100 and 101:
Large socket and brass hammer being
Page 102 and 103:
ENGINE ASSEMBLY 101 in the caps, po
Page 104 and 105:
Section of an oil-ring assembly. Le
Page 106 and 107:
Piston-and-rod assemblies lined up
Page 108 and 109:
A simple check to make sure pistons
Page 110 and 111:
metal cover. You can tap the seal i
Page 112 and 113:
Install water pump before the seale
Page 114 and 115:
Carefully fit oil pan on block and
Page 116 and 117:
Yes, 429/460 head bolts are differe
Page 118 and 119:
Installing early stamped-steel rock
Page 120 and 121:
lnstalllng the Intake-manifold end
Page 122 and 123:
ENGINE ASSEMBLY 121 With the gasket
Page 124 and 125:
12-15 ft. lbs. 4291460 has a horizo
Page 126 and 127:
LUBRICATING WICK- Centrifugal weigh
Page 128 and 129:
- 1 I Magnetic-pickup retaining cli
Page 130 and 131:
I - Real-life removal of top distrl
Page 132 and 133:
- Slide gear on the shaft while kee
Page 134 and 135:
housing with the remaining screw. I
Page 136 and 137:
Begin carburetor teardown by removi
Page 138 and 139:
You're now ready for the last big o
Page 140 and 141:
Install standard-transmission front
Page 142 and 143:
spots, creating little bumps on the
Page 144 and 145:
4 - -- - - - - - \ 2 ~ ---- I nrr:
Page 146 and 147:
_- PASSENGER CAR KICKDOWN ROD 10-25
Page 148 and 149:
TOOTH MUST BE PERFECTLY ALIGNED WIT
Page 150 and 151:
P'. Object here is to ger rnar rlrs
Page 152 and 153:
If your choke has a clip for routin
Page 154 and 155:
- R ENGINE INSTALLATION 153 ~ Cross
Page 156 and 157:
starts turning and the rest of the
Page 158 and 159:
After putting a few hundred miles o
Page 160 and 161:
Index A AIC compressor 152- 153 bac
Page 162:
HP AUTO BOOKS MAKE YOU THE PRO! I H
show all

How To Rebuild Your Ford V-8 351C-351M-400-429-460.pdf - Index of

Create successful ePaper yourself

Delete template?

Save as template?