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Author Topic: Magnum XLS 15 crankshaft removal  (Read 1722 times)

Offline Mark Knight

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Magnum XLS 15 crankshaft removal
« on: August 04, 2017, 07:24:59 PM »
I have a Magnum XLS 15 with a slightly bent crankshaft.  I recently bought a replacement crankshaft.  The back plate, head, and piston sleeve are removed along with the piston.  There are two bearings supporting the shaft.  I am having difficulty pressing out the shaft from the front and don't want to go any further fearing damage to the case.  Is there something I am missing?  Any suggestions?
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Offline Reptoid

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Re: Magnum XLS 15 crankshaft removal
« Reply #1 on: August 05, 2017, 03:28:41 PM »
Did you remove the prop drive and tapered collet?
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Offline Mark Knight

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Re: Magnum XLS 15 crankshaft removal
« Reply #2 on: August 06, 2017, 09:46:38 AM »
No.  I thought the prop shaft would push back through these.  Is the tapered collet the black ring between the shaft and prop drive?  How are these removed?
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Offline Reptoid

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Re: Magnum XLS 15 crankshaft removal
« Reply #3 on: August 06, 2017, 03:19:07 PM »
The correct way to remove it is with a puller. If you don't have one (likely) or can't borrow one, you can try heating the drive with a heat gun and gently tapping on the front of the crank. Once it pops loose from the taper, both the drive and the collet will slide off and then you can push the crank out the back.
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Offline Mark Knight

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Re: Magnum XLS 15 crankshaft removal
« Reply #4 on: August 06, 2017, 06:27:51 PM »
Thank you.  I will give that a try this evening and get back with you.
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Offline Mark Knight

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Re: Magnum XLS 15 crankshaft removal
« Reply #5 on: August 07, 2017, 12:28:41 PM »
I do not have a puller so heating the drive and collet was my only option.  After a few taps the crankshaft was free to pull from the back of the engine.  Now for re-assembly.  My plan is to freeze the crankshaft and heat the prop drive.  Push the shaft up through the back into the bearings, slide on the collet, then set the prop drive down over that. Any other way I could do this? 
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Offline RandySmith

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Re: Magnum XLS 15 crankshaft removal
« Reply #6 on: August 07, 2017, 01:59:30 PM »
Quote from: Mark Knight on August 07, 2017, 12:28:41 PM
I do not have a puller so heating the drive and collet was my only option.  After a few taps the crankshaft was free to pull from the back of the engine.  Now for re-assembly.  My plan is to freeze the crankshaft and heat the prop drive.  Push the shaft up through the back into the bearings, slide on the collet, then set the prop drive down over that. Any other way I could do this?

No do not do that, push the bearings into a hot case with the rear bearing on the crank, after it is installed  make sure the collet is loose from the drive washer, slide on the collet to the crank, push it all the way back until it touches the font bearing  inner race, then slide on the drive washer, put a prop in it, and tighten down the prop, this will press the drive washer up onto the collet


Note:  If you crashed this engine to bend  the crankshaft, you almost certainly damaged the front bearing, 90% of all  bent crank crashes  , ding  the  ball, and or race of the  bearings, so check it carefully by pressing preload on the front inner race, then turn it with your thumb or  finger, if you fell  bump  bump  bump, then it has to be replaced

Randy
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Offline Mark Knight

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Re: Magnum XLS 15 crankshaft removal
« Reply #7 on: August 07, 2017, 02:51:42 PM »
Thanks Randy,
You saved the day.  Once again after I follow these steps I will let you know how the progress goes.
I'm gracious for the advice.
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Offline Mark Knight

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Re: Magnum XLS 15 crankshaft removal
« Reply #8 on: August 08, 2017, 05:38:04 AM »
I checked the bearings and the front one feels a bit gritty compared to the rear bearing.  The front should be replaced.  Great, where am I going to find a replacement front bearing for this engine?  I was lucky to find a new crankshaft.  As everybody knows Hobby People no longer sells this engine and Global Services in no longer in business.  This is going to take a lot of shopping around.  Well, it is a spare engine I just want to have ready.  I have two other Magnum XLS 15's installed on CL Sportsmen Goodyear racers that are running great.
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Offline Dane Martin

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Re: Magnum XLS 15 crankshaft removal
« Reply #9 on: August 08, 2017, 08:22:52 AM »
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Offline Dane Martin

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Re: Magnum XLS 15 crankshaft removal
« Reply #10 on: August 08, 2017, 08:25:25 AM »
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Offline Mark Knight

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Re: Magnum XLS 15 crankshaft removal
« Reply #11 on: September 01, 2017, 07:45:15 PM »
I've gotten some great advice so far with the crankshaft change out.  Thank you guys.  I ordered bearings from Bocabearings for this engine and they assured me they are a direct replacement. 
I would like to change both front and rear bearings however, I am having difficultly removing the old rear bearing.  Heating the case with a portable heat gun doesn't help.  I have no way of driving out the bearing as there is no lip to tap on.  Got any suggestions?
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Offline pmackenzie

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Re: Magnum XLS 15 crankshaft removal
« Reply #12 on: September 01, 2017, 07:53:48 PM »
Quote from: Mark Knight on September 01, 2017, 07:45:15 PM
I've gotten some great advice so far with the crankshaft change out.  Thank you guys.  I ordered bearings from Bocabearings for this engine and they assured me they are a direct replacement. 
I would like to change both front and rear bearings however, I am having difficultly removing the old rear bearing.  Heating the case with a portable heat gun doesn't help.  I have no way of driving out the bearing as there is no lip to tap on.  Got any suggestions?

How I have always done it:
Heat the case till it is just over boiling (lick your finger and quickly touch the case to test). I use a propane torch.
Then hold the case in a heavy work glove and hit it on a wood block.
You need to hit it square, and fairly hard. The bearing should drop out. If not it is either too cold, or you did not hit it hard enough.
I have done this many,many times and never damaged a case or not been able to get a bearing out.

I have also read that others put it in the oven and keep upping the temp till it drops out by itself.

Pat MacKenzie
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Offline Steve Helmick

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Re: Magnum XLS 15 crankshaft removal
« Reply #13 on: September 01, 2017, 11:00:51 PM »
What Pat suggest works 99-ish% of the time. I had one engine, a Taipan 2.5 rear exhaust (a Rossi .15 wannabe) that I absolutely couldn't get the rear bearing out of, and I'd been doing this sort of stuff awhile. I turned an aluminum plug about 3/4" long that was a nice slip fit, with a 1/8" hole down the center, sawed it lengthwise on a bandsaw at 90 deg. intervals (like a "+") leaving about 1/4" unsawn. Stuck a sheet metal screw in the end and cranked it in until I couldn't get it any tighter, heated the lot up, and tapped on the plug with a drift and hammer. The bearing came right out. Where there's a will, there's a way. I doubt the OP will need to go to this extreme, but somebody might need this trick sometime, somewhere.  D>K Steve

Edit: As I recall, I put the screw head inward, toward the venturi, and whacked on the screw head. Theory being that this would drive the screw in tighter, if anything.
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Offline Mark Knight

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Re: Magnum XLS 15 crankshaft removal
« Reply #14 on: September 03, 2017, 04:49:41 AM »
I was not getting it hot enough.  I used a propane torch and the rear bearing just dropped out.  While the case was still very warm I inserted the crank and rear bearing in and seated the front bearing, collet, & drive washer with a prop, washer, & nut.  Wow, I really felt some accomplishment.  Thanks to all for your advice.  This little project took some time but with help I got it done right.
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