Having problems with your Ford Mustang ?

What are the torque specks on the head bolts?? on a 3.8 1998 mustang engine

Posted / edited by AnonymousUser on : 17-09-2018

Answers :

1998 Ford Mustang 3.8L SFI \015\0126cyl

\015\012\015\012CAUTION\015\012\015\012When draining the coolant, keep in mind that cats and dogs are \015\012attracted by ethylene glycol antifreeze, and are quite likely to drink \015\012any that is left in an uncovered container or in puddles on the ground. \015\012This will prove fatal in sufficient quantity. Always drain the coolant \015\012into a sealable container. Coolant should be reused unless it is \015\012contaminated or too old.\015\012\015\012
3.8L Engine
\015\012\015\012
    \015\012
  1. \015\012Disconnect the negative battery cable.\015\012
  2. \015\012
  3. \015\012Remove the upper and lower intake manifolds.\015\012
  4. \015\012
  5. \015\012Remove the valve cover(s) and rocker arms.\015\012
\015\012\015\012\015\012Be sure to label or separate all of the cylinder head components \015\012(such as pushrods, rocker arms, etc.) so that they can be installed in \015\012their original positions on the cylinder heads.\015\012
\015\012\015\012
    \015\012
  1. \015\012Remove the exhaust manifolds.\015\012
  2. \015\012
  3. \015\012If not already done, perform the following for left-hand cylinder \015\012head removal:\015\012\015\012
      \015\012
    1. \015\012Remove the Power Steering (PS) pump front mounting brace retaining\015\012 nuts from the water pump.\015\012
    2. \015\012
    3. \015\012Remove the alternator.\015\012
    4. \015\012
    5. \015\012Remove the idler pulley.\015\012
    6. \015\012
    7. \015\012Remove the PS pump/alternator bracket mounting fasteners, then \015\012(leaving all PS hoses attached) position the PS pump and bracket aside \015\012in a position so that PS fluid does not leak out.\015\012
    \015\012\015\012\015\012
  4. \015\012
  5. \015\012If not already done, perform the following for right-hand cylinder\015\012 head removal:\015\012\015\012
      \015\012
    1. \015\012If equipped with A/C, remove the compressor mounting bracket \015\012bolts, then (leaving all A/C lines attached) position the compressor \015\012aside.\015\012
    2. \015\012
    3. \015\012If not equipped with A/C, remove the idler pulley.\015\012
    \015\012
\015\012\015\012
    \015\012
  1. \015\012Remove and discard the cylinder head mounting bolts.\015\012
  2. \015\012
  3. \015\012Lift the cylinder head(s) up and off of the engine block.\015\012
  4. \015\012
  5. \015\012Remove and discard the old cylinder head gasket(s).\015\012
\015\012\015\012To install:
\015\012Lightly oil all bolt and stud threads prior to assembly, except those\015\012 specifying sealant, with clean engine oil.\015\012
\015\012\015\012
    \015\012
  1. \015\012Clean the cylinder head, intake manifold and valve cover gasket \015\012mating surfaces thoroughly.\015\012
  2. \015\012
  3. \015\012If a cylinder head was removed for head gasket replacement, \015\012inspect the cylinder head for warpage.\015\012
\015\012\015\012\015\012If a cylinder head is warped, have it ground by a competent machine \015\012shop before installing.\015\012
\015\012\015\012
    \015\012
  1. \015\012Position the new cylinder head gasket(s) on the engine block, then\015\012 install the cylinder head(s).\015\012
WARNING\015\012\015\012\015\012Always use new cylinder head bolts to ensure a leak-tight seal. \015\012Torque values with used cylinder head bolts can vary, which may cause \015\012coolant or compression leakage.\015\012\015\012\015\012\015\012
    \015\012
  1. \015\012Tighten the cylinder head bolts in the sequence shown in the \015\012accompanying illustration, and in the following steps to the proper \015\012values:\015\012\015\012
      \015\012
    1. \015\012Tighten the bolts to 15 ft. lbs. (20 Nm).\015\012
    2. \015\012
    3. \015\012Next, tighten the bolts to 29 ft. lbs. (40 Nm).\015\012
    4. \015\012
    5. \015\012Then, tighten the bolts to 37 ft. lbs. (50 Nm).\015\012
    6. \015\012
    7. \015\012Loosen the bolts, one at a time, two or three revolutions, then \015\012retighten them as follows:\015\012
    \015\012
WARNING\015\012\015\012\015\012Do not loosen all of the bolts at the same time in the following \015\012step; only work on one bolt at a time, then move on the next bolt in the\015\012 sequence.\015\012\015\012
1996-98 Models

\015\012\015\012\015\012Tighten the bolt to 29-37 ft. lbs. (40-50 Nm) for a long bolt, or \015\012to 133-221 inch lbs. (15-25 Nm) for a short bolt.\015\012Rotate the bolt an additional 180 degrees.\015\012Proceed to the next bolt in the sequence.\015\012\015\012\015\012
    \015\012
  1. \015\012Dip each end of the pushrods in engine assembly lubricant, such as\015\012 Ford D9AZ-19579-D or equivalent, then install the pushrods in their \015\012original positions.\015\012
  2. \015\012
  3. \015\012Apply engine assembly lube to the rocker arms prior to \015\012installation, then install the rocker arms.\015\012
  4. \015\012
  5. \015\012Install the exhaust manifolds.\015\012
  6. \015\012
  7. \015\012Install the lower and upper intake manifolds.\015\012
  8. \015\012
  9. \015\012Install the valve cover(s).\015\012
  10. \015\012
  11. \015\012Install the spark plugs, if removed. Then, connect the spark plug \015\012wires to the plugs.\015\012
  12. \015\012
  13. \015\012If necessary, install the PS pump and bracket on the engine, then \015\012install the alternator.\015\012
  14. \015\012
  15. \015\012If necessary, install the A/C compressor and bracket on the \015\012engine.\015\012
  16. \015\012
  17. \015\012If not already performed, install the accessory drive belt pulleys\015\012 and the drive belt.\015\012
  18. \015\012
  19. \015\012Connect the negative battery cable.\015\012
  20. \015\012
  21. \015\012Fill the engine with the proper type and amount of coolant.\015\012
  22. \015\012
  23. \015\012Start the engine and check for coolant leaks.\015\012

Hope help with this.
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