Gen V And Gen VI (Except 7.4L Gen VI) Engine Specifications
UNIT OF MEASUREMENT
In. (mm)
DISPLACEMENT
Bore
7.4L
454 MAGNUM
502 MAGNUM / 8.2L
4.25 (108)
4.46 (113.28)
Stroke
4.00 (101.6)
8.6:1
Compression Ratio
8.0:1
8.75:1
Cast Iron
(Oval Port)
Cast Iron
(Rectangular Port)
Heads
Intake Manifold
Block
Cast Iron (Note 3)
Aluminum With Brass Inserts-High Rise (Note 1)
Cast Iron (4 Bolt Main Bearing Caps)
Forged Steel
Rods
Pistons
Cast Aluminum (Note 2)
Cast Steel
Forged Aluminum
Forged Steel
Crankshaft
Camshaft
Cast Iron (Gen V) Steel (Gen VI)
Note 1: 7.4L / 454 and 502 Magnum Multi-Port engine is equipped with a cast aluminum intake manifold with
brass inserts.
Note 2: 7.4L Bravo Three engines with engine code
UB with serial number OF1589289 and lower will have forged pistons.
XX with serial number OF159290 and higher will have cast pistons
Note 3: Serial numbers OD838819 thru OF800699 are equipped with cast aluminum intake manifolds.
CYLINDER BORE
IMPORTANT: 7.4L Bravo Three engines with engine code UB with serial number OF1589289 and lower have
forged pistons. The piston specifications for the 454 Magnum must be used.
502
MAGNUM/
8.2L
ENGINE
7.4L
454 MAGNUM
4.2500-4.2507
(107.950-107.967)
4.2451-4.2525
(107.826-108.013)
4.4655-4.4662
(113.423-113.441)
Diameter
Production
Service
.001 (0.025) Max
.002 (0.05) Max
Out of Round
Thrust Side
Relief Side
.0005 (0.0127) Max
.001 (0.0254) Max
Production
Taper
Service
.001 (0.02) Over Production
PISTON
.0030-.0042
(0.0762-0.1066)
.0025-.0037
(0.0635-0.0939)
.0040-.0057
(0.1016-0.1447)
Production
Service
Clearance
.005 (0.12) Max
.0075 (0.15) Max
.0065 (0.16) Max
Index
3A-4 - 454 C.I.D. (7.4L) / 502 C.I.D. (8.2L)
90-823224--2 796
| Categories | Mercury MerCruiser Manuals |
|---|---|
| Tags | Mercury MerCruiser 454 CID, Mercury MerCruiser 502 CID |
| Model Year | 1993, 1994, 1995, 1996, 1997 |
| Download File |
|
| Document File Type | |
| Copyright | Attribution Non-commercial |
(4 votes, average: 4.5 out of 5)
Marine readers have rated 1993 1997 Mercury-MerCruiser GM V8 454 CID 7.4L and 502 CID 8.2L Marine Engines Service Manual Number 16 4.5 out of 5.0 based on 4 product reviews. Hugely helpful service manual! Perfect. Thank you!
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This book is invaluable if you do your own repairs. Great book.
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