Mercury 30 Service Manual

POWERHEAD - 4-190-826148R2 MARCH 1997
Specifications
BLOCK
Type
Displacement
2 Cyl. Loop Charged
39.3 cu. in. (644.4cc)
REED VALVE OPENING Opening (Max. Allowable) 0.020 in. (0.50mm)
STROKE Length 2.796 in. (71.0mm)
CYLINDER BORE
Dia. Standard
Taper/Out of Round Max
2.993 in. (76.0mm)
0.003 in. (0.08mm)
PISTON Dia. Standard* 2.988 in. (75.90mm)
PISTON RING
End Gap 0.010 in. to 0.018 in.
(0.254mm to 0.457mm)
WATER PRESSURE
With Thermostat + Poppet
@ Idle
@ W.O.T.
All Models W/O Thermostat + Poppet
@ Idle
@W.O.T.
Poppet Valve Opening 1994-1997
Poppet Valve Opening 1998 & Newer
1/2 - 1-1/2 PSI @750 RPM
5 - 7 PSI @ 5000 RPM
0 - 1 PSI @ 750 RPM
5 - 7 PSI @ 5000 RPM
900-1000 RPM
3000-3500 RPM
*See important information below.
IMPORTANT: Using a micrometer, measure di-
mension “A” at location shown. Dimension “A”
should be 2.988 in. ± .001 for a STANDARD size
piston.
Dimension “A”
at Right Angle
(90°) to Piston
Pin
0.50 in.
(12.7mm)
“A”
52676
TOP
CENTER
BOTTOM

Mercury 30 Specifications

General

Horsepower	30 HP
Cylinders	3
Displacement	526 cc
Gear Shift	F-N-R
Fuel Induction System	Electronic Fuel Injection (EFI)
Shaft Length	20 in
Steering	Remote / Tiller