6-bolt crank in 8-bolt engine?

How to keep the Cessna 170 flying and airworthy.

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3958v
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Post by 3958v »

Can one put an O300D crank in a C145 if they are willing to change props? Bill K
Polished 48 170 Cat 22 JD 620 & Pug
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GAHorn
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Post by GAHorn »

To change an engine from one designation to another (such as substituting a 6 bolt crank into an O-300-A engine which originally had an 8-bolt crank), one needs to follow the TCM Service Bulletin M75-6, Rev. 1.
(See the MX Library for that document.)
As for whether a C-145 may be so converted to an O-300-C (as such a modification would be under the first scenario) one might have to consult with TCM to see if that would meet the Service Bulletin.
'53 B-model N146YS SN:25713
50th Anniversary of Flight Model. Winner-Best Original 170B, 100th Anniversary of Flight Convention.
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