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IO-240 B Engine mounts

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bakerocb

Joined: 15 Jan 2006
Posts: 727
Location: FAIRFAX VA

Posted: Fri Jul 18, 2014 7:01 am Post subject: IO-240 B Engine mounts

7/18/2014



Hello Again Tim, You wrote: “... does anyone have the instillation 

instructions....”



There are no such official instructions that I am aware of, but I will pass 

on a few tips based on my experience:



1) To repeat, here are the part numbers and quantities that you will need 

for complete replacement of all elastomeric vibration isolators parts for an 

IO-240 B engine:



a) P/N 638225 Bushing. Unique to IO-240 A and B. Four required. I last 

bought these from Dart Aircraft Parts in 2008. List price was $52.34, my 

cost was $28.79. See here:



http://www.dartaircraft.com/



kmuellner(at)dartaircraft.com



b) P/N 530740 Bushing, Engine Mount. Same part number as for O-200. Eight 

Required. Available from Aircraft Spruce. See here:



http://www.aircraftspruce.com/catalog/eppages/contmountparts.php?clickkey=11688



2) You can support the engine with an engine hoist or crane while working on 

replacing the vibration isolators. See here:



http://www.harborfreight.com/automotive-motorcycle/shop-cranes/1-ton-capacity-foldable-shop-crane-69512.html



3) You may also use a bottle jack on the flat plate on the lower front of 

the crankcase. Suggest making a pad out of 3/4 inch thick plywood that just 

fits onto that plate and has a recess on the bottom of the pad for the top 

of the bottle jack. Don’t want the jack to slip and damage the crankcase.



4) You may also be able to work on replacing the isolators on one mount at a 

time without supporting the engine and loosening the other mounting bolts, 

but that is difficult to do.



5) Expect that the old isolators P/N 638225 may be stuck in the crankcase 

recesses and that you may have to gouge them out and clean out the debris 

from the crankcase recesses.



6) Plan on using a bit of silicone spray to slide the new P/N's 638225 into 

the recesses.



7) If the engine is not perfectly lined up you may have difficulty in 

getting the mounting bolt all the way through the stack of bushings and 

washers. You can make a bullet shaped short lead guide from a piece of 

hardware store .375 (3/ inch diameter bolt to assist in the line up and 

inserting of the mounting bolt. (Somebody on the internet is selling such a 

guide for that exact purpose, but I can not find it now.)



 When replacing some, but not all, of the elastomers in my engine the 

first time around did not initially raise the engine front end back up to 

the point that I wanted I cheated a bit and ground a bit off the ends of the 

two top P/N 653695 Spacers, Engine Mount. This squashed the top elastomers a 

bit more than the design called for when bolted in place with a bit shorter 

bolts, but it worked fine.



I have since replaced all parts with factory designed parts, but the next 

time my engine sags a bit I am going to reinstall those shortened P/N 653695 

spacers for an interim quick and easy fix rather than replace all of the 

elastomers (it is not an easy chore). I figure that this trick eliminates 

engine sag and gets close to double the life that I get out of a set of 

elastomers before needing total replacement.



9) ".... torque?...."



Just tighten the mounting bolts until the stack bottoms out on the P/N 

653695 spacer. Don't forget the cotter pin or use AN363-624 metal stop nuts 

instead. See here:



http://www.aircraftspruce.com/catalog/hapages/an363.php?clickkey=51378



Please let me know if you have any questions or problems.



OC

=============================================================================



From: Tim Yoder

Sent: Thursday, July 17, 2014 6:25 PM

To: kis-list(at)matronics.com

Subject: Engine mounts



My Cont. IO-240 B Engine mounts are 16 years old and need to be replaced. 

They are conical, of course. What are the ones I need and does anyone have 

the instillation instructions, torque?



Thanks,



Tim

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ftyoder(at)yoderbuilt.com
Guest

Posted: Fri Jul 18, 2014 3:53 pm Post subject: IO-240 B Engine mounts

Hi OC,



This is very helpful and very much appreciated. 



Tim 



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