Main Bearing; Reassembly Of Engine - Tecumseh SPECTRA 37 Service And Repair Manual

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d) MAIN BEARING
The needle bearings can be replaced using Tecumseh
tools (Fig 10).
Use tool 88841026 for flywheel side and tool 88841027
for PTO side to remove bearings.
To refit bearings use tool 88841530 for flywheel side and
tool 88841529 for PTO side.
NOTE - To remove or refit bearings, heat cylinder or
shroud base.

Reassembly of engine

- After having assembled the piston on the conrod, ensure
that the steel bearing halves match and insert on the
conrod and cap, ensuring that the two bearing shells
are correctly located.
Ensure that the alignment marks on the conrod cap
and conrod are matched. (Fig 12).
- Fit the crankshaft protecting the oil seal
- Fit the piston conrod assembly ensuring that hole in the
piston pin boss is on the flywheel side (opposite to the
exhaust).
- Place the cylinder-piston-conrod-crankshaft block on
a flat surface (Fig 13) and turn piston to BDC.
- Fit the 37 needles around crank pin leaving some
tolerance between conrod and crankshaft.
- Fit the conrod cap ensuring that the needles are retained
in their correct position.
- Progressively tighten the screws turning a few times to
ensure that the needles are located in place.
- Tighten conrod according to torque limits.
- Fit the shroud base ensuring that the gasket is fitted
correctly.
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Fig. 10
Fig. 11
Fig. 12
Fig. 13