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Old 12-23-2003, 09:37 PM   #1
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Exclamation How to change the engine bearing?

See the attachment! Special thanks Manticore's help.
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File Type: jpg change engine bearing.jpg (193.6 KB, 1422 views)
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Old 12-23-2003, 10:15 PM   #2
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Default Re: How to change the engine bearing?

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Originally posted by dino.tw
See the attachment! Special thanks Manticore's help.
Thanks. BTW you didn't mention how long it takes to bake the engine.
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Old 12-23-2003, 10:24 PM   #3
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Default Re: Re: How to change the engine bearing?

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Thanks. BTW you didn't mention how long it takes to bake the engine.
minimun 20mins maximun as long as you like jus dun crack it ok? Jus kidding....
Merry X'mas.........
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Old 12-24-2003, 01:37 AM   #4
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when you start to heat up the oven, it takes a while for the inside heat coil to heat up. the relay and the heat sensor sense on the heater. when the heater reaches 250'C that doesnt mean the engine case is also 250'C and it is much lower in temp. by the time the oven relay stops the heater, the engine case is likely to be below 100'c and that is the proper temp to release the main bearing. how long? that's depends on your oven
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Old 12-24-2003, 11:52 AM   #5
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Default How we do it .... when & why?

I like the visual aid original thread post here. Nice topic Too.

My experience with ideal temps required to remove bearing from casted aluminum nitro engine case is 150C/300F max. I find higher heats unnecessary and prefer leaving engine case in oven an extra 15 minutes (as some times required) allowing the casting with machined bearing surfaces to expand thoroughly. Manufacturers assembled press fit is 0.0002" thru 0.0004" (Just a few tenth of one-thousandth of one inch. Utilize your temp gauge with this procedure and avoid bringing engine case temp above 200C/400F as case will distort as alloy becomes overly malleable with extream heat....especialy above 250C/500F.

Cocidering replacement costs, Actual peak bearing performace/bearing longivity is in my opinion the nitro engines weakest link at this time.
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Old 12-24-2003, 07:54 PM   #6
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Adjusting the oven to 250C just because it's faster. If you use tempgun to measure the real temp. is about 200C.

There are a few engine parts need to maintain regularly.
1)Conrod;2)Bearings;3)Crankpin;4)Piston Wrist Pin

Most died engines were broken due to those wearing parts.
If people can maintain them regularly,Mfg can't take money from your wallet too much.....
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