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All Forums >> Glow Engines, Gas Engines, Fuel & Mfg Support Forums >> Engine Manufacturers Direct Support Forum >> MVVS Support >> MVVS 6.5 disassembly help
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MVVS 6.5 disassembly help - 5/2/2012 10:26 PM   
Stand



Posts: 102
Score: 100
Joined: 1/1/2003
Last Login: 5/19/2013
From: Richland, WA, USA
Status: offline 		I have an older MVVS (1995) engine that I need to replace the bearings. I am not having success in removing the sleeve. I have tried heating the case with a propane torch and gently prying under the bolts holding the cylinder casing to the base. I also tried using the casing bolts by unscrewing them to put pressure on the sleeve. I seems to be stuck and I don't want to beat it up taking it apart. I haven't tried putting it in an oven. And I assume that I'll have to do that to remove the bearings.

From the parts lists in Europe it looks like the sleeve should just slide up and out. I want to make sure there's not something holding it that I'm over looking.

Any suggestions?

Stan D

Never mind. I got it out. Just had to apply the heat a little more vigorously. Got apart and changed the bearings. It's all back together agian and ready to roar!

< Message edited by Stand -- 5/3/2012 12:24 AM >

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RE: MVVS 6.5 disassembly help - 5/2/2012 10:53 PM   
pe reivers



Posts: 6502
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From: Arcen, , NETHERLANDS
Status: offline 		take the head off, and remove rear cover / carb. Loosen the prop drive, but do not take parts off. The prop drive taper is not self-locking, so should pop off easily.
take the 4 screws that hold the cylinder jacket out.
Heat the case until the cylinder jacket/sleeve assembly loosens. (loctite on jacket/case junction)
it now is easy to remove the sleeve/piston/jacket/conrod assy from the engine
with case still hot, and crankshaft loosened but still in place as bearing guide, tap case on a wooden block to get the rear bearing loose.
remove rear bearing, re-insert crankshaft
tap out the front bearing using the crankshaft as bearing guide

Assemble in reverse order using loctite between jacket and crankcase.

Case heating is best done with a paint stripper. Use just enough heat to get the job done (about 100°C or 200°F)


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Pe, (www.mvvs.nl), MVVS, MOKImotor, RCexl, MTW, Xoar, Mejzlik.
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RE: MVVS 6.5 disassembly help - 5/3/2012 12:26 AM   
Stand



Posts: 102
Score: 100
Joined: 1/1/2003
Last Login: 5/19/2013
From: Richland, WA, USA
Status: offline 		Thanks I got all done. Just needed a little more heat on the case!

Cheers
Stan D

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RE: MVVS 6.5 disassembly help - 7/30/2012 4:06 AM   
fiery


 

Posts: 2287
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Last Login: 5/25/2013
From: Hervey Bay Queensland, AUSTRALIA
Status: online 		Love the paint stripper idea

I use the oven (my lady hates that) or a propane torch (leaves marks sometimes, and you have to be careful to "spread" the heat.



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