LUBRICATION, MAINTENANCE AND TUNE-UP Static timing of Bombardier engines requires the use of an accurate dial indicator to determine top dead center (TDC) of the piston before making any timing adjustment. TDC is determined by removing the spark plug and
f+---Base Set screw
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installing the dial indicator in the plug opening. The static timing method is used solely to verify the flywheel timing marks before using a timing light to check ignition timing. The static timing procedure can be used for the following: a. Verify factory timing marks. b. Detect a broken or missing flywheel Woodruff key. c. Detect a twisted crankshaft. d. To scribe timing marks on a new flywheel. Dynamic engine timing uses a timing light connected to the MAG side spark plug lead. As the engine is cranked or operated, the light flashes each time the spark plug fires. When the light is pointed at the moving flywheel, the mark on the flywheel appears to stand still. The flywheel mark should align with the stationary timing pointer on the engine.
Static Timing Check HI-:-:+---
Plunger Adapter
f+----Extension
1. Open the shroud. 2. Remove the drive belt as described in Chapter Eleven. 3. Remove both spark plugs as described in this chapter. 4. Remove the crankcase inspection plug
(Figure 52). 5. Install and position a dial indicator as follows: a. Screw the extension onto a dial indicator and insert the dial indicator into the adapter (Figure 53). b. Screw the dial indicator adapter into the cylinder head (Figure 54) on the MAG side. Do not lock the dial indicator in the adapter at this time. c. Rotate the flywheel (by turning the primary sheave) until the dial indicator rises all the way up in its holder (piston is approaching top dead center). Slide the indicator far enough into the holder to obtain a reading. d. Lightly tighten the set screw on the dial indicator adapter to secure the dial gauge. e. Rotate the flywheel until the dial on the gauge stops and reverses direction. This is