Usage:
3406, 3406B, 3406C, 3408 And 3412 Machine Engines
Description of Change: A new material is being used for all the straight thread O-ring plugs used on both sides of the cylinder block. The new O-ring material has a longer service life than the former O-ring.
On the 3406, 3406B and 3406C an optional new, stronger cover can be used whenever the fuel injection pump is removed if there is an indication of leakage. The optional new cover is made of steel and has a groove for an O-ring instead of the former aluminum cover and gasket.
Adaptable To: Chart A identifies the new and former straight thread O-rings and Chart B identifies the new and former cover and gasket/seal.
Typical view of the straight thread O-ring Seals (1), and the production aluminum cover (3) and the production gasket (2).