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Thread: Engine Mount Washers

  1. #21

    Join Date
    Jan 2022
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    Port Saint Lucie, FL
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    Default Re: Engine Mount Washers

    Jason, I would install the mounts and engine without any washers. Once the engine is mounted, put one leg of an 18 inch carpenters square against the firewall and the other at the aft section of the upper case split line. You can use a protractor to measure the angle between the square and the case split line. Should be 2 degrees right angle. Use an 8 inch digital level along the upper case split line. This should be 4 degrees down angle. These measurements will give you the thrust line of your engine to airframe. If it is out of tolerance, you can place washers as need to improve the thrust angle. Make sure that you have properly torqued the engine mount rubbers prior to checking the angles. It takes about 5 minutes to check with the upper cowling off. If you need more than a washer or two to bring it into line, you probably have something bent pretty good. Rebuilt motor mounts are a common issue. Some jigs are not so accurate, if they jig them at all.
    N2709P
    Last edited by N2709P; 01-13-2023 at 10:38 PM.

  2. #22
    Administrator Steve Pierce's Avatar
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    Nov 2007
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    Graham, Texas, United States
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    Default Re: Engine Mount Washers

    I check firewall to zero and then put the digital level across the two rocker covers if the engine is mounted. If not put the firewall side of the mount on a flat surface and being it is a conical mount the digital level should give you the angles when layed on the engine conical mount washers.

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