Craftsman Marine — Checking and adjusting injection timing
Adjustments · Fuel injection pump
From a Craftsman Marine service manual — check it applies to your exact model before use.
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Before you start
- Be sure to shut off the fuel feed before removing the delivery valve.
Procedure
- Disconnect the No.1 injection pipe.
- Remove the No.1 delivery valve; put back the valve holder only.
- Remove the tie-rod cover and disconnect the tie-rod from the control rack.
- Set the control rack to a midway position.
- Open the fuel feed pipe and confirm fuel flows from the delivery valve holder.
- Turn crankshaft clockwise and find the instant fuel stops flowing (real injection timing).
- Adjust injection pump mounting shim thickness to align with standard timing.
Specs & values
- Increasing or decreasing shim thickness by 0.1 mm [0.0039 in.] varies injection timing about 1°
- Standard injection timing: 15° bTDC (<2000 rpm), 17° bTDC (2000-3600 rpm), 19° bTDC (3600 rpm)
Source: Craftsman Marine service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.