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Reassembly of engine, but 1 problem.

Old 11-04-2007, 12:40 PM
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Default Reassembly of engine, but 1 problem.

I dissasembled a K&B .61 size glow engine, and I am almost done reassembleing it, but I need some advice on how to get the fly wheel (thing behind the prop) back on, there are two parts, a prop washer, and then the fly wheel thing, anyone have any advice?
Old 11-04-2007, 01:57 PM
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Default RE: Reassembly of engine, but 1 problem.

I think the part you are talking about is the prop drive hub. I'm sitting here looking at one of my K&B 61's (mine has a pump) and the drive washer just falls into place once you line it up correctly with the flats on the crankshaft. If you have a boat version with bigger "actual" flywheel it may be slightly different.

You install the drive hub, prop, flat washer, nut in that order.
Old 11-04-2007, 02:11 PM
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Default RE: Reassembly of engine, but 1 problem.

Mine doesn't just slide on, its like it would have to be pounded on and thats the last thing I want to do.
Old 11-04-2007, 02:16 PM
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Default RE: Reassembly of engine, but 1 problem.

http://www.mecoa.com/kb/aero/aircraft.htm
Which P/N do you have? I have the 6550. Check the included manuals for possible help. These people are the currrent manufacturers of the K&B line and also have parts.
Old 11-04-2007, 02:21 PM
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Default RE: Reassembly of engine, but 1 problem.

They have a FAQ page that includes an email address for questions like yours. If you use it be sure to state which model of engine you are writing about.
Old 11-04-2007, 02:39 PM
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Default RE: Reassembly of engine, but 1 problem.

its used, don't know the model number, is it somewhere on the engine
Old 11-04-2007, 05:20 PM
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Default RE: Reassembly of engine, but 1 problem.

Look at the pics in the link I sent you and see if any look familiar.

Also, are you sure it's a 61? Maybe a K&B 65 Sportster?
Old 11-04-2007, 06:02 PM
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Default RE: Reassembly of engine, but 1 problem.

Try putting both the engine and the thrust washer in the freezer for about 45 minutes. The cold will frequently shrink the metal enough to allow the parts to go together with minimal force. When the parts get back to room temperature everything will b nice and tight.

If you do the freezer thing, AFTER the engine is back to room temperature (about 1 1/2 - 2 hours ) give the engine a shot of afterrun oil and turn it over a few times to take care of any condensation that may have formed.
Old 11-04-2007, 07:10 PM
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Default RE: Reassembly of engine, but 1 problem.

If you put the engine AND the thrust washer in the freezer you'll be in the same boat, just with cold fingers, because the thrust washer will shrink too, you just want the shaft to shrink, and the hole in the thrust washer to stay big.
Old 11-04-2007, 07:58 PM
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Default RE: Reassembly of engine, but 1 problem.

Thanks I will try that to get it on the shaft, but I still have to press the thrust washer into the prop drive hub, they won't stay together, any special tools or techniques I should know?
Old 11-04-2007, 08:57 PM
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Default RE: Reassembly of engine, but 1 problem.

You're confusing me. What does your "thrust washer" look like? Is it flat or is conical in shape and maybe split? Any pics?
Old 11-04-2007, 10:05 PM
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Default RE: Reassembly of engine, but 1 problem.

ORIGINAL: Gary L.

If you put the engine AND the thrust washer in the freezer you'll be in the same boat, just with cold fingers, because the thrust washer will shrink too, you just want the shaft to shrink, and the hole in the thrust washer to stay big.
Think about what you said for a moment. The crankshaft is going to shrink, that is definite. The thrust washer is also going to shrink, however as the thrust washer shrinks, the hole is going to get larger because the metal surounding the hole is going to shrink thus making the hole larger.
Old 11-04-2007, 10:07 PM
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Default RE: Reassembly of engine, but 1 problem.

Does your engine look like this?
Attached Files
File Type: pdf
Om33545.pdf (92.0 KB, 2 views)
Old 11-05-2007, 09:32 AM
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Default RE: Reassembly of engine, but 1 problem.

TimC - that's the one I was starting to think of. If that is the one he has, all he should need to do is assemble it with a prop and tighten the nut firmly. It should all draw together when done.
Old 11-05-2007, 04:50 PM
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Default RE: Reassembly of engine, but 1 problem.

YES!!! Thats it. You know what I should do?
Old 11-05-2007, 06:02 PM
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Default RE: Reassembly of engine, but 1 problem.


ORIGINAL: F-15 Fan

YES!!! Thats it. You know what I should do?
Did you read post #14?
Install the prop stud fully. Slide the prop dive collet on the prop stud, then the prop drive then an old prop. Then add the prop washer and nut and tighten down firmly. You will NOT hurt anything. It should seat the collet in the rear of the driver.
Old 11-05-2007, 06:54 PM
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Default RE: Reassembly of engine, but 1 problem.

I tried that, the prop driver still won't fit over the prop drive collet. It keeps sliding off.
Old 11-05-2007, 09:08 PM
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Default RE: Reassembly of engine, but 1 problem.

OK, now that we know a little more about your engine here is what should be a part list
http://www.mecoa.com/kb/61/61-parts.htm
You need to decide if you have the ringed or ABC version. You should recall from your disassembly.

You can try your question on the K&B forum

http://www.modelengine.org/forum/vie...cc038e37b5e54f
Old 11-05-2007, 09:13 PM
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Default RE: Reassembly of engine, but 1 problem.

F-15 Fan, I'm having trouble understanding your problem. If the prop driver won't snug against the collet, maybe it is cracked? I've never had one that wouldn't go over the collet.
Old 11-05-2007, 09:19 PM
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Default RE: Reassembly of engine, but 1 problem.


ORIGINAL: TimC

F-15 Fan, I'm having trouble understanding your problem. If the prop driver won't snug against the collet, maybe it is cracked? I've never had one that wouldn't go over the collet.
I agree, it's usually hard to get them apart. Not hard to get them together.
Old 11-06-2007, 04:16 PM
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Default RE: Reassembly of engine, but 1 problem.

Its not cracked, but I guess the best thing to do now is take to our local hobby store and ask them about the problem, since he can visually see the engine. But thanks for the help guys.

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