1942-47 Hudson Mechanical Procedure Manual

SECTION 3 ENGINE TUNE-UP
PAGE 17
ENGINE TUNE-UP
Engine tune-up can be either a major
tune-up with a complete carburetor adjustment
or a minor tune-up which. does not
require a complete electrical and fuel
check.
A complete engine tune-up every 5,000
miles will maintain the best engine
performance and give the utmost in gasoline
economy.
Adjust Breaker Contacts
Recommended gap at contacts is .020 inch
for 6 Cylinder distributors, .017 inch for
8 Cylinder models, measured
preferably with a wire type feeler gauge.
Contacts should be in full register when
closed. If dirty they should be cleaned
with tetra-chloride of carbon
MINOR TUNE-UP
There are many cases when an adjustment
of ignition or carburetion for idling is
all that is necessary to return the engine
to proper performance. A complete minor
tune-up should include the following work.
Regap Spark Plugs
After cleaning the spark plugs, adjust
the gaps to .032 inch using a wire type
feeler for gauging. Never bend the
center electrode.
Figure 5
Breaker Point Adjustment - 8 Cylinder
or unleaded gasoline. If contacts are
pitted or burned install new ones. Contact
face roughness may be corrected by using a
thin, flat, Carborundum hone.
Figure 4
Breaker Point Adjustment - 6 Cylinder
To adjust gap, first turn crankshaft
until cam follower, portion (A) of contact
arms Fig. 4 or 5, is on the highest point
of one of the cam lobes. Loosen lock nut
(B) and turn adjusting screw (C) until
recommended gap is obtained. Recheck the
gap after tightening the lock nut, until
contact arm fiber cam follower (A) Figs.
4 or 5 is on highest point of cam, then
loosen