Model A, B & G28T

Ford Garage

Cylinder Head Nut Tightening Sequence

Pictured above is the only recommended engine cylinder head nut tightening sequence I have found published by the Ford Motor Company for Model A and B type engines. This image is from the 1948 Ford-Köln Lastwagen Ruhr Truck Instruction Book.

This engine is an improved G28T Model BB engine, first introduced in Germany during 1942. The G28T cylinder head is also interchangeable with that of US and British Model A & B engines, and Russian GAZ Model BB engines.

Pictured below is a somewhat different cylinder head nut tightening sequence which is commonly recommended by Larry Brumfield and by various modern Model A publications.

Also note that the combustion chamber hem of the gasket and any stamped lettering should always be placed 'up', in contact with the cylinder head, not the engine block.

<---Front
(Distributor Side of Engine)
⑨ .... ③ .... ⑥ .... ⑫
⑬ .... ⑦ .... ① .... ⑧ .... ⑭
⑪ ... ⑤ .... ② .... ④ ... ⑩
(Oil Fill Side of Engine)

Ford did not publish actual torque values for the Model A cylinder head nuts, but the long accepted standard has been 55 lb-ft for a stock head, and as much as 65 lb-ft for a 6:1 high compression head.

It is recommended to initially torque the head in three passes following the sequence above, going from 35 to 45 to 55 lb-ft. Then after some running and cool down cycles to re-torque to 55 lb-ft again because the gasket will take some compression and lose some torque after initial use.


More related information on Ford Garage:

  1. Model A & B Cylinder Head Gasket Guide comprehensive listing
  2. Model A & B Cylinder Head Compression Ratios
  3. Snap-on Cylinder Head Nut Wrench proper torque application tool
  4. Cylinder Head Flatness Requirements by Larry Brumfield
  5. Model A & B Cylinder Head Gasket Installation Instructions by Larry Brumfield
  6. Model A & B Cylinder Head and Distributor Pullers by Ron Cloat
  7. Model A & B Cylinder Head Stud Removal Tools
  8. Model A & B Broken Cylinder Head Stud and Bolt Removal

August 2010