1948-53 Pontiac Hydramatic Manual (pg 89)

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Fig. 128 Dial Indicator in Place to Check Face

  15. Install flywheel and oversize dowel (below).

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  16. Replace transmission assembly (page 117). NOTE: Be sure to use lock washers under heads of front to rear flywheel housing bolts.

REPLACEMENT OF FLYWHEEL

FLYWHEEL TO CRANKSHAFT CONSTRUCTION

    Flywheel has fit of .001" loose to .002" tight on crankshaft flange and is held with six 1/2" special bolts which are tightened gradually to 105 ft. lbs. torque, using alternate opposites. A dowel pin is used to carry part of torque. Dowel has .001" to .0025" press fit in both flywheel and crankshaft (Fig. 129). Special seal compound (Pliobond 30) is used between flywheel and crankshaft.

    When making repairs, dowel hole is finish reamed and an oversize dowel is installed after six flywheel to crankshaft bolts are tightened. This procedure removes scores and prevents oil leakage. Dowels cannot be reused after removal, nor can another dowel be used in same dowel hole. Special tools are available for installing oversize dowel.

OIL LEAK AT FLYWHEEL SEAL,
DOWEL OR BOLTS

    When inspection shows an oil leak to be located at flywheel to crankshaft seal, dowel, or at one or more of flywheel to crankshaft bolts

Fig. 129 Flywheel to Crankshaft Construction

(Trouble Diagnosis and Testing, page 132 ), it will be necessary to remove flywheel and make following repair.

REPLACEMENT OF FLYWHEEL, FLYWHEEL SEAL, DOWEL OR BOLTS

    1. Remove transmission assembly (page 53 ).

    2. Remove flywheel to crankshaft dowel, using tool J-2774-1 and J-2153 (Fig. 130). Dowel must be tapped (5/16"-24) for tool J-2774-1.

    3. Remove flywheel bolts, plates, and flywheel. If flywheel does not come off easily, a slight prying action between front surface of flywheel and block may be necessary. CAUTION: Do not hammer on flywheel in any way so that it will become damaged or distorted. Protect torus cover gasket surface from nicking or burring.

    4. Clean flange of crankshaft and mating surface of flywheel by scraping. If available, Acetone may be used as solvent for Pliobond 30 seal compound. CAUTION: Do not scratch or nick these surfaces.

    5. Apply thin film (approximately 1/2" wide) of special seal compound (Pliobond 30) on the surface of crankshaft at bolt circle diameter.

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