Designation:
- 1.3 with low compression - Skoda 781.135
- 1.3 with high compression - Skoda 781.136
Cylinder bore diameter — 75.50 mm
Stroke - 72.00 mm
Working volume - 1289 cm3
The order of operation of the cylinders is 1-3-4-2 (cylinder No. 1 from the side of the crankshaft pulley)
Direction of rotation of the crankshaft - Clockwise (when viewed from the right side of the car)
Compression ratio:
- Engine 135 - 8.8:1
- Engine 136 - 9.7:1
Output power:
- Engine 135 - 59 hp (43 kW) at 5000 rpm
- Engine 136 - 63 hp (46 kW) at 5000 rpm
Cylinder block
Material - Aluminum alloy
Cylinder liner diameter:
- Rated -class A - 75.500 mm
- Rated -class B - 75.510 mm
- Rated -class C - 75.520 mm
Permissible deviations from the nominal diameter - +0 009 mm / -0 mm
Protrusion height of the cylinder liner above the cylinder block:
- Nominal - 0.07-0.13 mm
- The maximum difference between any two sleeves is 0.04 mm
Crankshaft
Number of main bearings - 3
Main bearing journal diameter:
- Nominal - 60.00 mm
- 1st regrinding - 59.75 mm
- 2nd regrinding - 59.50 mm
- 3rd regrinding - 59.25 mm
Permissible diameter deviations (all necks) - from -0.010 to -0.029 mm
Main bearing shell thickness:
- Nominal - 2.495 mm
- 1st regrinding - 2.620 mm
- 2nd regrinding - 2.745 mm
- 3rd regrinding - 2.870 mm
Thickness tolerances (all bearings) — from +0.000 to -0.010 mm
Working clearance of the main bearing - 0.016-0.065 mm
Connecting rod bearing journal diameter.
- Nominal - 45.00 mm
- 1st regrinding - 44.75 mm
- 2nd regrinding - 44.50 mm
- 3rd regrinding - 44.25 mm
Permissible diameter deviations (all necks) - from -0.009 to -0.025 mm
Conrod bearing shell thickness:
- Nominal - 1.490 mm
- 1st regrinding - 1.615 mm
- 2nd regrinding - 1.740 mm
- 3rd regrinding - 1.865 mm
Thickness tolerances (all bearings) — from +0.000 to -0.007 mm
Connecting rod bearing working clearance - 0.019-0.060 mm
Width of the neck of the main bearing No. 1:
- Nominal - 31,500 mm
- 1st regrinding - 31.625 mm
- 2nd regrinding - 31.750 mm
- 3rd regrinding - 31.875 mm
Permissible width deviations - from 0.000 to +0.025 mm
Thrust washer thickness:
- Nominal - 1.490 mm
- 1st regrinding - 1.615 mm
- 2nd regrinding - 1.740 mm
- 3rd regrinding - 1.865 mm
Thickness tolerances (all washers) — from +0.000 to -0.010 mm
Axial play of the crankshaft - 0.020-0.106 mm
Pistons and piston rings
Piston diameter:
- Rated -class A - 75.475 mm
- Rated -class B - 75.485 mm
- Rated -class C - 75.495 mm
- Permissible diameter deviations (all pistons) —±0.009 mm
The clearance between the piston and the cylinder bore is 0.025 mm
Clearance between the ring and the wall of the groove in the piston:
- Top compression ring - 0.040-0.072 mm
- Second compression ring - 0.030-0.062 mm
Piston ring gap: | New | limit value |
Compression rings | 0.25-0.40mm | 1.00 mm |
Oil scraper ring | 0.20-0.35mm | 1.00 mm |
Piston pins
Diameter - 19.997-20.000 mm
The diameter of the bushing of the upper head of the connecting rod is 19.999-20.005 mm
The diameter of the hole for the finger in the piston is 19.998-20.006 mm
Piston pin clearances:
- Between the pin and the piston - 0.002-0.007 mm
- Between the pin and the bushing of the upper head of the connecting rod - 0.001-0.008 mm
Connecting rods
Length between centers — 133±0.1 mm
Axial play of the connecting rod cap - 0.065-0.182 mm
Cylinder head
Material - Aluminum alloy
Valve seat angle - 45°
Valve seat width:
- Intake valve 1.5mm
- Exhaust valve 1.7mm
Camshaft and rocker arms
Drive - Chain from the crankshaft pulley
Number of bearings - 3
Camshaft lobe diameter:
- From the side of the pulley - 38.950-38.975 mm
- Central - 38.450-38.475 mm
- Flywheel side - 29.959-29.980 mm
Diameter of the opening formed by the bearing surfaces of the camshaft bearing:
- From the side of the pulley - 39.000-39.025 mm
- Central - 38.500-38.525 mm
- Flywheel side - 30.000-30.021 mm
The working clearance of the camshaft bearings is 0.025-0.075 mm
Camshaft axial play - 0.020-0.066 mm
Rocker Outer Diameter:
- Nominal - 20.980-21.000 mm
- Repair - 21.193-21.200 mm
The inner diameter of the hole in the rocker arm:
- Nominal - 21.000-21.021 mm
- Repair - 21.200-21.221 mm
Valves
Seat angle - 45°
Head diameter:
- Inlet valve - 34.00±0.12 mm
- Exhaust valve - 30.00±0.12 mm
Rod diameter (nominal):
- Inlet valve - 7.982±0.015 mm
- Exhaust valve - 7.975±0.015 mm
Clearance between stem and valve guide:
- Inlet valve - 0.018-0.037 mm
- Exhaust valve - 0.025-0.037 mm
Setting the valve timing (with a nominal gap of 0.43 mm):
- Inlet valve opening - 12°BTDC
- Inlet valve closing - 48°after BDC
- Exhaust valve opening - 42°to BDC
- Exhaust valve closing - 8°after TDC
Valve spring free length:
- Internal spring - 43.60 mm
- External spring - 45.85 mm
Lubrication system
System pressure:
- Minimum at 1500 rpm - 3.5 bar
- Maximum - 5.8 bar
Oil Pump Type - Power Feed Gear
Oil pump clearances:
- Between pinion shaft and cover:
- Nominal - 0.02-0.06 mm
- Wear limit - 0.15 mm
- Between pin and driven gear:
- Nominal - 0 014-0.050 mm
- Wear limit - 0.1 mm
- Between gears and pump cover (axial clearance) — Maximum 0.1 mm
Tightening torques Nm
Bolts of fastening of a head of the block of cylinders:
- Stage 1 - 17-20
- Stage 2 - Tighten 90°
- Stage 3 - Tighten 90°
Cylinder head nuts - 20-23
Valve cover nuts - 2-3
Valve mechanism mounting bolts - 25-30
Drive chain cover bolts - 5-8
Rocker cover nuts - 2-3
Pallet bolts - 7-9
Downpipe / oil pump strainer - 5-8
Flywheel bolts - 55-65
Flywheel housing plate bolts - 8-10
Camshaft sprocket bolt - 30-35
Crankshaft pulley bolt - 100-120
Main bearing cap bolt - 67-75
Connecting rod bearing cap nut - 36-40
Oil pressure sensor - 20-25
Plugs for lubrication channels in the cylinder block:
- Thread 12 mm - 20-30
- Thread 16 mm - 50-55
Left and right engine/transmission mounts:
- Tie bolts - 42-50
- Bolts of fastening of an arm of a suspension bracket to a body — 39-45