Engine mount to Firewall bolt torque for N1320D

How to keep the Cessna 170 flying and airworthy.

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Psmith
Posts: 40
Joined: Thu Aug 22, 2002 3:34 pm

Engine mount to Firewall bolt torque for N1320D

Post by Psmith »

I have a 51 170A. What is the criteria for replacing the rubber pads (engine mount to firewall) and what is the bolt torque. Also there are 2 slotted tabs on copilots side, cabin side of the firewall, what are/were they for? Thanks.




Pete Smith N1320D
Lewistown, MT
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n3439d
Posts: 18
Joined: Tue Apr 23, 2002 5:03 am

Post by n3439d »

The cessna 172 manuals cover this subject well, the mounts and torque values are listed.

ken
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GAHorn
Posts: 21290
Joined: Fri Apr 12, 2002 8:45 pm

Re: Engine mount to Firewall bolt torque for N1320D

Post by GAHorn »

Psmith wrote:I have a 51 170A. What is the criteria for replacing the rubber pads (engine mount to firewall) and what is the bolt torque. Also there are 2 slotted tabs on copilots side, cabin side of the firewall, what are/were they for? Thanks.


Pete Smith N1320D
Lewistown, MT
The "Cessna 100 Series, 1962 and prior, Service Manual" (available from Aircraft Spruce 877/477-7823) says to tighten the mounts until the rubber mounts "bulge out slightly". The mounts should be replaced whenever they are dry rotted, cracked, sag excessively or are excessively age-hardened.
Some mounts (not usually found on 170's) have a steel bushing within the mount itself, and those should be torqued according to the torque tables found on page 1-8 in the service manual.
Last edited by GAHorn on Wed Dec 04, 2002 3:48 am, edited 1 time in total.
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Psmith
Posts: 40
Joined: Thu Aug 22, 2002 3:34 pm

51 170A Rubber engine mounts

Post by Psmith »

Are the rubber firewall mount pads typically replaced before the plane is 52 years old?


Pete
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mit
Posts: 1067
Joined: Wed May 01, 2002 1:54 am

Re: 51 170A Rubber engine mounts

Post by mit »

Psmith wrote:Are the rubber firewall mount pads typically replaced before the plane is 52 years old?


Pete

Probably. 48's don't have any except at the eng. to mount.
Tim
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N170BP
Posts: 552
Joined: Mon Jul 22, 2002 7:24 pm

Post by N170BP »

Mine were trashed, and I suspect they were the originals.
I was looking for a torque value as well but only found
the blurb in the 100 series service manual saying to tighten
them until they bulge slightly. I suppose over-tightening
them could lead to cracking / failure....

The bushings were relatively inexpensive (got them
from http://www.iwantcessnaparts.com).

Bela P. Havasreti
'54 C-170B N170BP
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