Inspection Of Seals; Internal Inspection - Tecumseh SPECTRA 37 Service And Repair Manual

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Inspection of seals

Fig 4 shows the points to which are fitted the gaskets and
oil seals that must always be checked to ensure good
running of the engine. On a 2 stroke engine all the seals
are very important for correct operation.
NOTE - On the short block it is important to ensure that
the 4 transfer port plugs are perfectly sealed (Fig 4 A).
When replacing the plugs, seal with Loctite or similar.
Gaskets
Gaskets fitted to points B - C - D (Fig 4) must be fitted
without the aid of any adhesive.
Grease may be used every time the engine is stripped.
Replace the above gaskets when servicing.
Crankshaft seals
Visually check both crankshaft seals (Fig 4 E and F) and
replace if oil is apparent on the outside of the seal.
The crankshaft seals may be removed with the crankshaft
in position with the aid of special tool Part No. 670286.
c)

INTERNAL INSPECTION

If compression loss occurs after inspection of the seals
and gaskets, dismantle the short block as follows:
- Remove cylinder head
- With the cylinder head removed a first visual check on
the cylinder condition can be made by turning piston to
BDC.
- Remove shroud base (Fig 5)
NOTE - During disassembling take care the 27
needles of the top main bearing do not get lost as
they are not caged.
- Remove the reed plate assy
At this point the conrod may be removed as follows:
- Turn the piston to BDC
- Remove the two conrod screws with a 3-16" hexagonal
head key
- Remove big end cap taking care not to lose the 37
needles
- After having removed the big end cap rotate the
crankshaft until the piston is turned to TDC.
NOTE - Before carrying out this operation clean
carbon from the upper part of the cylinder. Then
remove the piston and the conrod.
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Fig. 4
Fig. 5
Fig. 6