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Technical discussions specific to 1964-1967, 1968-1970, and 1971-1973 Classic Mustang. Discuss all tech related to in-line six cylinder and V8 powered Vintage Mustangs here.

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Unread 11-09-2009   #1 (permalink)
toofun is offline Rookie


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Default 71 302 valve adjustment.. Help!!

Why cant Ford do things like Chevy... one way to adjust valves for hydraulic and one way for solid.. Not this if it has this type of rocker do this and if it has this type of stud tighten all the way till you cant tighten any more.. frigin nightmare.. Anyways I figured its easier to post a UTUBE video to show what my problem is so PLEASE VIEW IT and post back what you think?? ANY HELP AS USUAL IS GREATLY APPRECIATED!... Thanks in advance!!
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Unread 11-09-2009   #2 (permalink)
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Here is Chilton's description for a 71 torino valve adjustment.

Identifying Type Of Rocker Arm

The 8-cylinder engines use 2 different type rocker arms. Before proceeding with any cylinder head work or valve adjustment, it is important to identify the type of rocker arms installed.
The early 5.0L engine were equipped with adjustable rocker arms. However, due to production differences, some of these early 5.0L engines may be equipped with positive stop rocker arm mounting studs.
To identify the type of rocker arm installed, proceed as follows:
  1. Remove the rocker arm cover from the cylinder head. Refer to section 3 for details.
  2. Examine the studs used to secure the rocker arms.
  3. If the shank portion of the stud exposed above the cylinder head is the same diameter as the threaded portion to which the rocker arm retaining nut attaches, this is an adjustable type rocker arm.
  4. If the shank of the stud is of greater diameter than the threaded portion, this identifies the stud as a positive stop rocker arm stud.
  5. Refer to the appropriate procedure below.
Adjustable Rocker Arms
  1. Crank the engine until the No. 1 cylinder is at TDC of the compression stroke and the timing pointer is aligned with the mark on the crankshaft pulley.
  2. Scribe a mark on the pulley at this point. This we will call A.
  3. Scribe three more marks on the damper, dividing the damper into 4 quarters. These additional marks we will call B, C and D.
  4. With mark A aligned with the timing pointer, adjust the valves on the No. 1 cylinder, by backing off the adjusting nut until the pushrod shows free-play in it. Then, tighten the nut until there is no free-play in the rocker arm. This can be determined by turning the pushrod with your fingers while tightening the nut; when the pushrod can no longer be turned, all clearance has been removed. After the clearance has been removed, tighten the nut an additional 3/4 of a turn.
  5. Repeat this procedure for each valve, turning the crankshaft 1/4 turn to the next mark each time and following the engine firing order of 1-5-4-2-6-3-7-8.
Positive Stop Type Rocker Arms
  1. Crank the engine until the No. 1 cylinder is at TDC of the compression stroke and the timing pointer is aligned with the mark on the crankshaft pulley.
  2. Scribe a mark on the pulley at this point. This point we will call A.
  3. Scribe two additional marks on the pulley. These points we will call B and C.
  4. With the timing pointer aligned with mark A on the pulley, tighten the following valves to the specified torque: 4.2L, 5.0L, 7.0L, and 7.5L Engines
    • Intake Valve on Cylinder No. 1, 7 and 8,
    • Exhaust Valve on Cylinder No. 1, 5, and 4
    5.8L and 6.6L Engines
    • Intake Valve on Cylinder No. 1, 4, and 8
    • Exhaust Valve on Cylinder No. 1, 3, and 7
  5. Rotate the crankshaft 180 to point B and tighten the following valves: 4.2L, 5.0L, 7.0L, and 7.5L Engines
    • Intake Valve on Cylinder No. 5 and 4
    • Exhaust Valve on Cylinder No. 2 and 6
    5.8L and 6.6L Engines
    • Intake Valve on Cylinder No. 3 and 7
    • Exhaust Valve on Cylinder No. 2 and 6
  6. Rotate the crankshaft 270 to point C and tighten the following valves: 4.2L, 5.0L, 7.0L, and 7.5L Engines
    • Cylinder Intake Valve No. 2, 3, and 6
    • Cylinder Exhaust Valve No. 7, 3 and 8
    5.8L and 6.6L Engines
    • Cylinder Intake Valve No. 2, 5, and 6
    • Cylinder Exhaust Valve No. 4, 5, and 8
  7. Tighten the rocker arms on 4.2L , 5.0L and 5.8L engines until the nut contacts the rocker shoulder, then tighten to 18-20 ft. lbs. (24-27 Nm).
  8. Tighten the rocker arms on 6.6L engines until the nut contacts the rocker shoulder then tighten to 18-25 ft. lbs. (24;34 Nm).
  9. Tighten the rocker arms on 7.0L and 7.5L engines until the nut contacts the rocker shoulder then tighten to 18-22 ft. lbs. (24-30 Nm).
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Unread 11-10-2009   #3 (permalink)
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Default 71 302 valve adjustment.. Help!!

Hello toofun,
Hello from Medford, MA. A nice video.
i would change the nuts in addition to readjust.

be careful on the valve that the rockers came off of. Be certain it is free.

Good job........ Print Dad
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Unread 11-10-2009   #4 (permalink)
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Default valve adjustment

Well I figured out that I have the NON ADJUSTABLE type of valves because the studs are definately alot wider at the base than at the threads.... I looked up the procedure to test to see if the push rods are the right size as well as the torque setting of the nuts.. I will report back with any results.. Hopefully this will solve it...

Thanks to you all....

Mark
TOOFUN
"roadrage" 65 Mustang Fastback
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