Coupler install per Merc bulletin

[Tidbart]

Not a big deal but sometimes the little things help.

My service manual on the 502 doesn't have the updated procedure but I found the service bulletin and followed it.

This already assumes you have the motor out and the old coupler removed.

1. Check runout on the flywheel. Install a dial indicator on the side edge of the teeth of the flywheel. Pic 1

2. Good to have a second pair of hands for this one.... Rotate the engine 360 degrees, checking the runout as you go. Should be no more than .008 in. max. Mine was .002 max.

[Tidbart]

3. Obtain 3 tapered head screws from you local hardware store. 3/8-16 x 3/4. I need to get 1-1/4" long screws for the 502 flywheel. Wasn't enough thread on the 3/4" ones.

4. Install the 3 screws in every other hole and snug them tight. This is the change from the manual. The tapered head screws insure the coupler is centered over the flywheel hole.

[Tidbart]

5. Install 3 of the six permanent machine screws with loctite or equivalent.

6. Torque the 3 to 35 lb-ft.

[Tidbart]

7. Remove the 3 temp screws and install the last 3 permanent screws per steps 5 and 6.

[Tidbart]

8. Prime and paint if your as anal as I am.

Service bulletin is No. 2009-11

Bob