Hatz 1B20-1B50 Manuals, Engine Specifications & Bolt Torques

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Hatz 1B20-1B50
Connecting Rod Bolts


1B20
20-22 Nm 15.0-16.2 lb.ft

1B30
29-31 Nm 21.4-22.9 lb ft

1B40
40-42 Nm 29.5-31.0 lb ft

1B50
40-42 Nm 29.5-31.0 lb ft

Hatz 1B27, 1B50
Cylinder Head Bolts


If the cylinder head screws are loosened for whatever reasons, the stud screws (tension screws) must be replaced for new.

1B27
10 Nm, 7.38 lb.ft

1B50
with new crank case
10 Nm, 7.38 lb.ft

1B50
with used crank case
5 Nm, 3.69 lb.ft

Hatz 1B20-1B50
Displacement, Bore, and Stroke

Displacement
1B20 = 232 cc/ml
1B27 = 280 cc/ml
1B30 = 347 cc/ml
1B40 = 462 cc/ml
1B50 = 517 cc/ml

Bore
1B20 = 69 mm
1B27 = 74 mm
1B30 = 80 mm
1B40 = 88 mm
1B50 = 93 mm

Stroke
1B20 = 62 mm
1B27 = 65 mm
1B30 = 69 mm
1B40 = 76 mm
1B50 = 76 mm

Hatz 1B20-1B50
Arrangement and
Compression Ratio

Arrangement
One cylinder
Air-cooled
Four-stroke-diesel

Compression Ratio
1B20 = 1:22.0
1B27 = 1:21.5
1B30 = 1:21.5
1B40 = 1:21.0
1B50 = 1:20.5

Hatz 1B20-1B50
Weight

approx
1B20 = 33 kg
1B27 = 34 kg
1B30 = 38 kg
1B40 = 55 kg
1B50 = 55 kg