Engine Overhaul Western Skyways

Engine Overhaul Western Skyways

<HTML>Hello George

Well George I've made up my mine I'm going with WesternSkyways
First I went to there web sight and was extremly impressed.I also called
and spoke with Trent He explaned to me the proccese and really took the time to explain every detail including cylinders difference's.Thank you for suggesting them. Do you think I should have mine overhauled or should I get an exchange
engine whats your opinion,my engine was overhauled once in 1977.Oh yea!  I asked If he knew you and sure enough he did .Well hope to here from you soon.

Thank You</HTML>

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Re: Engine Overhaul Western Skyways

<HTML>Well, I'm sorry to read that they know me.  Now I guess I'm going to have to start looking around for someone else who can be tricked into doing work for me! (grin)
Re: Your own engine everhauled VS an exchange engine---
  O300's are great little engines that enjoy a particularly good reputation for reliability.   But in the mid-70's Cessna developed a relationship (ultimately ending up in a marriage) with Lycoming, with a result that more and more Cessna's were born with Lycomings in them.  The C145/O300 engine fell into history.  The only reason so many parts are still around for them is because so many of them were issued originally, that a good market existed for TCM to service.   Several decades worth of business resulted.   Now that's becoming less true.  TCM subsequently quit making many parts for them, and has now completely quit remanufacturing them at Mobile.  They still support the engine in other ways, ...just not by reman/rebuilding them.
  Cylinders became short-supplied until Superior began making them, which spurred TCM back into making parts, but the real heart of the engine is the crankshaft.  New-dimensioned crankshafts are becoming very scarce.  (Rumor has it that Superior was considering entering that arena, but the TCM/cylinder experience has got to cause them some concern.  It's difficult to recover R&D investments if after production, TCM comes back in and steals a large part of the market.  Anyway, the problem is finding an airworthy crank.
  An exchange engine is priced according to the rebuilder's efforts to produce a profit that will overcome any expected expenses of rebuiliding, including lost cores due to rejected parts.   A rebuilder therefore must conclude in advance that your crankshaft is X-% unlikely to be salvageble, and the cost of that planning is built into their pricing schedule.
  The alternative is your risk of assuming your parts will be capable of re-certification.  If you know your engine is in good condition (other than simply being timed out) you have an excellent chance to save money.  If your crankshaft (and other parts) are low time, not abused or damaged, and not excessively worn because you've cared well for the engine in it's lifetime,...then you have an excellent opportunity to end up with a successful, low-cost overhaul/rebuild.
  However, if you choose the overhaul route, and the crankshaft was found to be unuseable, then you have the misfortune of having to pay for another crank, lose any core-deposit of your red-tagged crank, and possibly suffer considerable down-time while another crank is found.  The price of the exchange engine may look pretty good to you if down-time is a factor.  Here's what I suggest.
  If you intend to fly the aircraft to Montrose and wait for an installation, then the exchange engine is the most likely best choice in terms of time VS money.
  If you intend to have your engine removed locally and shipped to Montrose, then I'd ask Western Skyways if they already have an airworthy crank in stock, and what additional cost to expect if your own crank fails inspection.  With those numbers in hand, you'll be better able to make a decision.  You may also have a better handle on it if you knew the history of your present crank.  You say it's been overhauled once already.  Are you certain that it's only ONCE?  And does the logbook entry state whether standard or oversize bearings were used in the rebuild?  (Or does it list pn's that can be traced to bearing sizes?)  This is where good records, good log-book entries become truly valuable.   (It's why a pre-purchase inspection that considered log entries could have told you what to expect next overhaul.  An airplane with a record of "Engine overhauled" is less informative than one stating "Engine rebuilt utilizing .010U bearings, Part number XXX...")  A crank can be reused only so many times before it's too small, as each time it's re-machined to an acceptable size and reinstalled.
  I'll tell you this, ....Western Skyways will do you a really good job.   They will build you a solid engine either way.  They will do it with enough profit involved to keep them in business no matter which route you choose.  Their interest will be in pleasing you with the final product comensureate with their excellent reputation.  I suggest that they are the ones both in the business and in the position of judging whether or not your engine is likely to be a successful candidate for a fast, economical rebuild, or whether it should be exchanged.  One advantage of rebuilding your own engine's parts is that you already know the operating history of those parts.  An exchange engine (especially a "reman" exchange) has a lot of unknowns with regard to it's history.  (I.E., has your crank ever suffered a prop-stirke?  Is yours likely to measure out standard?  Or are you willing to accept an exchange engine that has a crank already undersize and perhaps definitely will not pass inspection for still another overhaul when that time comes?) 
  If you are confident that your engine's internals are low time and well cared for, and if the shop has an airworthy crank available or in stock, then if time is not a major factor, I'd go for the overhaul.  You may save a little.  If, on the other hand, your research (logbooks) tell you that your crank has already had one overhaul in your crankcase, and maybe came from another engine before that, and that .020 undersize bearings were used the last time, and that maybe a previous owners oil-change records are a little sketchy and that nose seal has had a pesky leak no matter how many times it's been changed.....and/or turnaround time is important to you,....then an exchange certainly sounds better and better.
  Otherwise, get Western Skyways opinion, and go with it.  After all, if they know their business and we already trust their expert judgement.    That's why we're using them.  Right?
  Regards, George</HTML>

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