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Catalog 111 • Page
99
P105
sherwood
F5B-9 / F6B-9
johnson
jabsco
crankshaft mounting
crankshaft / harmonic balancer mount
Belt
Crank
Pulley
Gear/Slot
Shaft
HIGH SPEED, EFFICIENT MOUNT
Crankshaft/Harmonic balancer mount pumps are specifically designed for high-speed
operation (up to 5000 rpm) and are fitted with a drive flange bolted directly to the crankshaft
pulley, thus eliminating mounting brackets, belts and pulleys. Since these pumps are only
supported by the ball bearings, they must be prevented from rotating by means of a torque
arm to prevent the pump housing from turning and damaging or disconnecting the inlet
and outlet hoses.
All of the below models will mount on small and large block Chevy engines.
Model
Seal
Chevy
Port
Gallons Per Minute at RPM
Number
Type
Size
1000
2000
3000
4000
4500
JA 50410-1201 Lip
454 Block 1
1
/
4
" Barb
8.0
17.5
29.0
39.5
43.5
JA 50410-1251 Lip
350 Block 1
1
/
4
" Barb
4.0
12.0
19.0
27.0
30.0
JA 50410-1301 Mech. 454 Block 1
1
/
4
" Barb
8.0
17.5
29.0
39.5
43.5
JA 50410-1351 Mech. 350 Block 1
1
/
4
" Barb
4.0
12.0
19.0
27.0
30.0
BRONZE HOUSING, LARGE, SMALL & 8.1 liter chevy BLOCK
The Jabsco series crankshaft/harmonic balancer mount pumps come in full cam (high
flow) and half cam (medium flow) versions with lip or mechanical water seal. The half cam
pumps are typically used on “350” small block Chevy engines. The full cam pumps are used
on “454” large block Chevy engines. (The replacement impeller for the 50410 series is JA
18777-0001). See
for service parts.
Model
Port
Gallons Per Minute at RPM
Number
Size
1000
2000
3000
4000
4500
JS 10-24232-1 (F6B-9)
1
1
/
4
" Barb
9.5
19.0
29.0
34.5
33.0
JS 10-24228-1 (F5B-9)
1
1
/
4
" Barb
5.2
12.0
18.5
24.5
25.5
JS 10-24805-1
1
1
/
4
" Barb
9.5
19.0
29.0
34.5
33.0
BRONZE HOUSING, LARGE AND SMALL BLOCK CHEVY
Johnson manufactures two variations to provide raw water cooling for the “350” small block
(10-24228-1) and “454” large block (10-24805-1 formerly 10-24232-1). Chevy engines are
commonly used by Volvo, Indmar, Pleasurecraft, Marine Power and many others. Each size
is unique and requires different replacement impellers: JS 812B (10-24232-1) / JS 1027B
(10-24228-1). See
and
for service parts.
Model
Port
Gallons Per Minute at RPM
Number
Size
1000
2000
3000
4000
4500
SH P105
1
1
/
4
" Barb
9.5
19.5
29.0
32.5
30.0
Stainless Housing, Small Block Chevy
Sherwood manufactures their pump out of stainless steel with ample flow of raw water
for cooling the “350” small block Chevy engines commonly used by Volvo, Indmar,
50410 Series