FO-4 I&T (Remastered Ver.1.2 ) 05-24-2015
The one-piece valve guides
can be installed in engines
originally equipped with the
two-piece type. If valve
rotators are not included in
the change-over, it will be
necessary to use the same
valve springs as used for the
two-piece type of guide.
Springs in tractors with two-
piece valve guides should
test 37-40 pounds @ 2 1/8
inches; for one-piece guides
41-44 pounds @ 1.80 inches.
Renew valve springs if
protective pain coating is
lost or if tension is less
than specified.
VALVE PUSH RODS (TAPPETS)
26. Valve pushrods (tappets)
are of the barrel type. On
tractors built prior to 1951,
the tappets are of the non-
adjustable type, later
tractors are equipped with
adjustable tappets.
Adjustable type tappets can
be installed in engines
originally equipped with the
non-adjustable type, and this
change-over is recommended.
Adjustable tappets are also
included in Ford Special
Equipment Kit 8N6546B which
provides special exhaust
valve rotators. This kit can
be installed in 2N, 9N and
early 8N tractors. Tappet
clearances (gaps) of .010 - .
012 inlet, .014 - .016
exhaust, cold, are used on
both types of tappets.
Method of adjusting the adjustable type tappets is shown in Fig. FO18. Required are
Connect/Report Errors – jcchapster@gmail.com
Fig. FO17 - Free valve type exhaust valve rotators
used on later engines and available in kit form
for early engines.
Fig. FO18 Showing special tappet holding wrenches–
needed for adjustment of Ford engines with
adjustable type tappets. A regular tappet end
wrench should be ground off as shown in upper left.
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