Cylinder Head Combustion Deck Inspection And Refacing; Valve Guides: Inspection And Installation - Dodge D250 1990 Service Manual

Base Engine Components
DODGE Turbo Diesei
Alternative Repair Procedures
Page9K-17
Cylinder Head Combustion Deck Inspection and j^fo
Refacing S=*^
Inspect the head surface for nicks, erosion, etc.
Check for head distortion as illustrated.
Limit
Variation: .010mm [0.0004 inch] in any given 50.8mm [2.0
inch] diameter area. The overall end or side-to-slde variation
limit is:
• 0.30mm [0.012 inch]
The combustion deck may be refaced in whatever increments
necessary to clean up the surface and maintain the surface
finish and flatness tolerancing, as long as the combined total of
stock removed does not exceed 1.00mm [.0393 inch]. The
amount of stock removed each time must be steel stamped
just above the edge of the combustion deck on the lower right
hand corner of the rear face.
A « 1.00mm [.03937 inch] total
B = 94.00 ± 0.25mm [3.7008 ± .0010 inch]
minimum (reference only)
C « Surface finish 1.5 to 3.2 micrometers
[60 to 128 microinches]
D = Identification area for stamping amounts of
stock removed
Valve Guides: Inspection and Installation
Inspect the valve guides for scuffing or scoring.
Measure the valve guide bore.
Diameter Limits
New Minimum: 8.019mm [0.3157 inch]
New Maximum: 8.029mm [0.3165 inch]
Worn Limit: 8.090mm [0.3185 inch]