5.0l
/ 305 cid / 5.7l / 350 cid ENGINES
SERVICE MANUAL NUMBER 24
Valve Seat Repair
Valve seat reconditioning is very important, since seating of valves must be perfect for
engine to deliver maximum power and performance.
Another important factor is valve head cooling. Good contact between each valve and its
seat in valve head is important to ensure that heat will be properly dispersed.
Several different types of equipment are available for reconditioning valve seats. Equipment
manufacturer’s recommendations should be followed carefully to attain proper results.
a
b
d
c
50668
Typical “3 Angle” Valve Seat
a - Top Angle (30°)
b - Seat Angle (46°)
c - Bottom Angle (60°)
d - Seat Width
Intake 1/32-1/16 [.031-.063] In. (0.8-1.5 mm)
Exhaust 1/16-3/32 [.063-.094] In. (1.6-2.3 mm)
Regardless of type of equipment, it is essential that valve guide bores be free from carbon
or dirt to achieve proper centering of pilot in valve guide, ensuring concentricity.
72338
Measuring Valve Seat Concentricity
Index
Page 3A-38
90-861327--1 OCTOBER 1999
| Categories | Mercury MerCruiser Manuals |
|---|---|
| Tags | Mercury MerCruiser 305 CID, Mercury MerCruiser 350 CID |
| Model Year | 1998, 1999, 2000, 2001 |
| Download File |
|
| Document File Type | |
| Copyright | Attribution Non-commercial |
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