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12-07-2004 04:19 AM  13 years agoPost 1
dkshema

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Cedar Rapids, IA

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I was out flying one of my Caliber 30's this past Saturday. Second flight, about 20 feet off the ground on a landing approach, the engine simply stopped. The main tank had about a 1/4 inch of fuel left in it, the header was full.

The engine is (should say - "was") an OS32SX-H.

Here's why it quit:

Third time this year. Bummer.

Dave

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12-07-2004 07:18 AM  13 years agoPost 2
ShempHoward

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San Francisco, Ca - too many beggars + bad drivers

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Third time?? Makes you wonder if perhaps its something you are doing or not doing for this to become a three time problem. I peeled a 32SX-H by perhaps running it a bit too lean and Hobby Services honored the warranty long after it was up. Pehaps they will do the same for you?

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12-07-2004 10:48 AM  13 years agoPost 3
Al Magaloff

rrMaster

12,199 Posts- Enough Time Wasted. See Ya!

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Doesn't look lean though, but could be. Maybe you should consider another fuel. Were all three blow-ups run on the Sig stuff?

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12-07-2004 11:16 AM  13 years agoPost 4
Crusty

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N51 degrees 29.823 minutes W3 degrees 16.133 minut

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Gordon bennet!!!!!!!!1,
you got "ANY" oil in yer fuel?

I am dsylexia of borg..resistance is fruity...your arse will be laminated

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12-07-2004 01:03 PM  13 years agoPost 5
airdodger

rrElite Veteran

Johnston USA

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Just curious what procedure do you use to install crank nut? Is the cylinder liner discolored along with the crank can't tell in the pics? Also looks like the top of piston is rounded not a sharp edge? Chris

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12-07-2004 01:24 PM  13 years agoPost 6
dkshema

rrMaster

Cedar Rapids, IA

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All three "blowups" were using the same fuel. But that wouldn't explain why my 50-SXH, 70-SZH, ST90, 40SX, 46SX, ST45 and LA46 (and a whole list of other engines) are still running strong. I've used this fuel for years, I don't think it's fuel related.

The fuel is 22% oil, and there is plenty of residue on the skid strut below the muffler after each flight.

Cylinder is nice and clean (except for the bits and pieces of engine).

Not run lean, as you can see, the piston is nice and clean, as is the plug.

If you look at the top picture, the bronze bushing is still on the crank pin, and even it doesn't look too bad inside. The crank journal looks a bit suspicious, however.

The large end of the rod appears to have just let go. The engine was running fine, and gave me no hint of trouble until it just went south before landing.

My guess is the rod is being stressed from overspeeding at some point in the flight, perhaps coming down the backside of a Split-S (or some other inverted maneuver) and not getting back into positive pitch fast enough. The one-way bearing has never given me a hint that it is slipping so I don't think that's the culprit, either.

In any event, this gives me reason to spring for a 37 as it's going to cost more to repair this one than it would to purchase a new 32!

Oh, I DON'T use the piston locking tool, I do use the OS machined delrin/nylon crank lock.

Dave

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12-07-2004 06:34 PM  13 years agoPost 7
Chem Geek

rrVeteran

AL

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A 37, or the Toki 40

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12-07-2004 06:58 PM  13 years agoPost 8
Yogi 1

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Clinton,CT USA

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You might want to start running a governer and if you allready are than turn down the max limit some. I've been using the Throttle Jockey with excellent results easy to set up works flawless.Good Luck Yogi

Velocity Is A State Of Grace Get Some Now !

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12-07-2004 07:01 PM  13 years agoPost 9
dkshema

rrMaster

Cedar Rapids, IA

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Yeah, this 32 is toast, and not wise to spend repain $$ on it (it's probably out of warranty by now). Up until now, all the repairs have been freebies, as the engines have been under warranty.

I've been planning a winter upgrade to the 37 -- this looks like a good reason to do that.

I have a spare 32 -- I can stuff it back in the heli for awhile.

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12-07-2004 10:21 PM  13 years agoPost 10
cootertwo

rrApprentice

Labelle Florida USA

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Hi Dave. Can you say TOKI Ha!

One Day At A Time

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12-07-2004 11:21 PM  13 years agoPost 11
dkshema

rrMaster

Cedar Rapids, IA

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C2 -- I understand that putting a TOKI 40 in your Caliber requires that you have a real good crash right after installing it, to make that big red head fit between the frames.

When I finally replace the 32 for good, I'm probably going to chicken out and go with the OS 37. They have the same HP and RPM ratings, and the 37 drops in with no mods. I've also got a KSJ399 muffler in the shop that should make the 37 happy.

Dave

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12-10-2004 11:34 AM  13 years agoPost 12
Jason WAI

rrVeteran

Hong Kong

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OS 37 SZ H,....... Radical New Design OS 30 class engine,with specially designed 20M carburetor

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