[FWDLK] Fwd: FW: Chassis Black, frames

[eastern sierra Adj Services <esierraadj@xxxxxxxxx>]

Got that Technical Service Bulletin (#D-70; 6/6/57) right here. It's
entitled: " Enameling
of Frame & Chassis Parts". 

It begins : Investigation & research has shown that the spraying of the
partially assembled
chassis can be eliminated without affecting the expected service life of
the parts.


The TSB then lists the various chassis parts that are not to receive
additional chassis-black paint.

The TSB concludes by saying:

Examination of past model cars in service has shown the same degree of
rusting, between parts painted with chassis black enamel and unpainted
parts after approximately one year.
The parts that are on the chassis at the time this operation is
performed are either plated, painted[!!!], or chemically surface treated
prior to assembly, or are of metal or heavy gauge which requires no
further protection to prevent severe loss of strength due to corrosion."

The TSB does NOT state when the factory 1st began NOT to paint the
various suspension  parts,incl upper/lower control arms, sway bar, strut
bars, AND the Torsion bars (but, they were already 'painted', prior to
delivery 'to' the car).

Neil Vedder 
 


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• From: "David Homstad" <dhomstad@xxxxxxxxxxx>
• Date: Tue, 12 Sep 2006 16:03:26 -0500

FYI

 

-----Original Message-----
From: Wayne Graefen [mailto:wgraefen@xxxxxxx]
Sent: Tuesday, September 12, 2006 8:17 AM
To: David Homstad
Subject: Chassis Black, frames

 

 

 CHASSIS

 

   NOTE:  Also see 'Body and Paint - Factory Body Assembly and Paint Application'

 

 

CHASSIS  BLACK

Early in the 300C production year, the assembled "rolling chassis" (less motor, transmission, propeller shaft and brake lines) was given a light spray of an asphalt-based product known industry-wide as "chassis black".  This was to minimize corrosion on unpainted metal components while cars were shipped or sat in dealer inventory. 

It was applied only to the front and rear suspension areas only, by workers above the chassis, such that often undersides of parts received minimal coverage.  This coating obscured some information such as stencils or inspection marks (see 'Markings').

"Restoration", particularly for judged shows, rarely includes this type of protectant because individual parts are far more carefully prepared and finished with paint or plating than was ever done in a factory assembly line situation.

Nevertheless, cars built in the first part of the year should have their chassis painted with chassis black to appear as they did when they left the factory.

It is believed that there was a production change in June of 1957 affecting the appearance of the chassis when cars left the factory.  A June 6, 1957, Technical Service Bulletin was issued regarding Dodge passenger cars stating that "spraying of the partially assembled chassis" with chassis black would be "eliminated".  We can assume this was a corporate-wide cost- saving measure and that similar bulletins were issued in all Chrysler divisions.

The Dodge bulletin goes on to state that the following component parts are not painted and that these parts were on the chassis prior to this point the spraying operation was performed.  These parts "are either plated, painted, or chemically surface treated prior to assembly, or are of metal of heavy gauge which requires no further protection to prevent severe loss of strength due to corrosion".

•     Sway bar

•     Front struts

•     Upper & lower control arms

•     Exhaust pipes

•     Mufflers

•     Tail pipes

•     Gas tank

•     Bar spring anchor (torsion bar anchor)

•     Steering knuckle tie rails (tie rod adjustment tubes)

•     Links over arms (upper control arm brackets)

•     Propeller shaft & U-joints

•     Differential carrier housing

•     Rear spring U-bolts and shackles

 

Differential carrier housings have been noted in red oxide primer.  These may have been painted prior to factory assembly or may have been factory warranty replacement units that would have had to have been painted to extend warehouse shelf life of appearance.

   NOTE: Because bare steel rusts just from the humidity in the air, for your restoration you may desire to coat the above listed parts with some type of preservative. Products from Eastwood Company called "Nyalic" (clear sealant), "Spray Gray"(spray paint), or "Heavy-Duty Anti Rust" (brown wax film) are available in aerosol form. 

Without availability of a similar Chrysler Bulletin as the Dodge item noted above, it can not be conclusively said that all 300Cs built prior to June 6th, 1957, should be restored including an application of chassis black, or that cars built that date and later should omit a coat of chassis black.  However that is a probable assumption from research to date.

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