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Drilling a Motor Mount |
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Tools | Main Menu |
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Most
engine mounting drill guides merely mark the motor mount. Then you must drill
exactly perpendicular to the mount and exactly through the mark. Good luck. Our drill bushing kit requires no luck. |
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Step 1 Our drill bushing may be just a little larger than the holes in the
engine lugs. If that is the case, you
will need to drill the engine lugs using the larger diameter drill supplied
in the kit. A light touch on the hand
drill helps the drill exactly follow the existing hole. |
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Step 2 Now, our bushing fits snugly in place, and we can mount the engine. |
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Step
3 Position the
engine, clamp it to the mount with a spring clamp and insert the bushing. |
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Step
4 Using the bushing
as a guide, drill completely through the motor mount with the 6” drill that comes
with the kit. The arrows in these photographs shows that the drill has gone
through. |
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Step
5 Remove the engine
and enlarge the pilot hole for whatever screws you will use. A 4-40 screw takes a #43 or 3/32" drill;
these sizes are nearly identical. If
you choose larger 6-32 screws, use a #36 drill. Now the mount can be tapped.
The threads on a tap are tapered. That allows several teeth to cut and
also helps the tap align itself with the hole. Fiberglass threads easily so
there should be no problem. |
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Step
6 A
single screw holds the motor in place much better than a spring clamp. So attach the engine to the motor mount
with the single screw. This shot
shows the drill bushing method being used to drill the remaining three holes. |
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Step
7 The screws are
all parallel to each other, perpendicular to the mount and attach the engine
and mount. |
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Tools | Main Menu |
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