Head Bolts

(Difference between revisions)

Revision as of 22:52, 2 August 2012

A-series head bolts are designed to be reused; they are not Torque-To-Yield (TTY) bolts.

Maintenance Schedule

Retighten cylinder head bolts every 24 months or 24000 miles whichever comes first.

600 mile service
24 months/24000 miles

See Changing Head Gasket for torque specifications and procedure.

Overview

BOLT-FIXING CYLINDER HEAD SHORT
11056-18001 36 lb ft
11056-H1000 43 lb ft
11056-H2301 58 lb ft

Original Lo-torque bolts (B10 & early B110 -1172) - 36 ft-lb

• 11056-18001 BOLT-FIXING CYLINDER HEAD SHORT
• 11057-18000 BOLT-FIXING CYLINDER HEAD LONG
• 11058-18000WASHER-LOCK FIXING CYLINDER HEAD

Newer medium torque bolts (1272-) - 43 ft-lb

• 11056-H1000 BOLT-FIXING CYLINDER HEAD SHORT (9 needed) $2.90
• 11057-H1000 BOLT-FIXING CYLINDER HEAD LONG [Center bolt] $2.51
• 11058-H1000 WASHER-LOCK FIXING CYLINDER HEAD $2.28

A12GX, A12T, A12S, A13, A14, A15, A12A - 58 ft-lbs

• 11056-H2301 HEAD BOLT SHORT (9 needed) $3.96
  • NOTE Some newer lo-power (round port) A12S are spec'd for 11056-H1000
• 11057-H2301 BOLT-CYLINDER HEAD LONG, TO OIL GALLERY (TO 6/73) $3.88
  • one needed
• 11057-H5000 BOLT-CYLINDER HEAD LONG, TO OIL GALLERY (FROM 7/73) $4.03
  • one needed
  • Also used by Z24 and KA24E
• superceeded 11057-H5700?

A12: Long middle bolt marked 'T'
A14: Long middle bolt marked '13'

Hi-torque bolts marked "13" on the head. Remove the valve cover to verify.

head bolts
Cro-Mo-V steel
13T

Lock Washer

• 11058-H1000 WASHER-LOCK FIXING CYLINDER HEAD -8504 $2.28
• 11058-21002 Washer Cyl Head 8504- $2.57