454
CID (7.4L) / 502 CID (8.2L)
SERVICE MANUAL NUMBER 23
454
Mag / 502 Mag / 8.2L (Except 7.4L MPI L-29) Engine Specifications
(Continued)
VALVE SYSTEM
MODEL
454 MAG
502 MAG / 8.2L
Lifter
Hydraulic
Rocker Arm Ratio
1.70 to 1
45°
Face Angle (Intake & Exhaust)
Seat Angle (Intake & Exhaust)
Seat Runout (Intake & Exhaust)
46°
.002(0.05) Max
Intake
1/32-1/16 [.03125 .0625] in. (0.79-1.58 mm)
Seat Width
Exhaust 1/16-3/32 [.0625-.09375] in. (1.58-2.38 mm)
Intake
Exhaust
Intake
.0010-.0027 (0.025-0.069)
.0012-.0029 (0.0304-0.0736)
Production
Service
Stem
Clearance
.003 (0.07)
.004 (0.10)
.0037 (0.09)
.0049 (0.12)
Exhaust
Intake
.372 (9.45)
.372 (9.45)
Stem Diameter
Exhaust
Valve Margin (Intake and Exhaust)
Valve Lash (Intake and Exhaust)
.0312 (0.79)
Fixed Lash
VALVE SPRING
MODEL
454 MAG / 502 MAG / 8.2L
Free Length
2.15 (54.6)
Closed at 1.88 in.
110
Lbs. (489 N)
(47.8
mm)
Closed at 1.80 in.
Does Not Apply
(45.7
mm)
Valve
Spring 1
Pressure
Open at 1.34 in.
316
Lbs. (1406 N)
(35.1
mm)
Open at 1.40 in.
Does Not Apply
(35.6
mm)
Installed Height
Free Length
1.88 (47.7)
1.86 (47.2)
Damper or
Damper
Shield
Approximate Number Of
Coils
4
Damper or
Damper
Shield
Valve Spring Fit in Damper
Shield
Does Not Apply
1
454/502/8.2L Models Only-Test spring pressure with inner and outer spring assembled.
Index
Page 3A-10
90-861326--1 MARCH 1999
| Categories | Mercury MerCruiser Manuals |
|---|---|
| Tags | Mercury MerCruiser 454 CID, Mercury MerCruiser 502 CID |
| Model Year | 1998, 1999, 2000, 2001 |
| Download File |
|
| Document File Type | |
| Copyright | Attribution Non-commercial |
(1 votes, average: 5 out of 5)
Marine readers have rated Mercury MerCruiser GM V8 GM V8 454 CID 7.4L and 502 cid 8.2L Marine Engines Service Manual Number 23 5.0 out of 5.0 based on 1 product reviews. Just need the manual. Wrote review. Can't technically review what I haven't seen yet...