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Old 04-21-2010, 07:39 PM   #1
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Default How to Re-Install Engine Bearings? Please Help!

I am rebuilding my os speed and I would like some advice on how to re-install engine bearings. I have already taken the originals out by heating up the engine in the oven.

Please share your knowledge, all help is greatly appreciated.
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Old 04-21-2010, 07:43 PM   #2
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Reheat the engine block, Insert front bearing and use a wood dowel to push it in and seat it properly. Put the rear bearing on the crankshaft and insert the crank. Make sure you either tap the back of the crank with a dowel and a soft tap, or push really hard until it seats properly. Let the block cool and re-assemble the rest. Idle one tank to seat the bearings good and then re-tune
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Old 04-21-2010, 07:46 PM   #3
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Originally Posted by Jaz240 View Post
Reheat the engine block, Insert front bearing and use a wood dowel to push it in and seat it properly. Put the rear bearing on the crankshaft and insert the crank. Make sure you either tap the back of the crank with a dowel and a soft tap, or push really hard until it seats properly. Let the block cool and re-assemble the rest. Idle one tank to seat the bearings good and then re-tune
Thanks, that really helps. I heard that one can put the bearings in the freezer to help with the re-installation. Have you heard or experimented with this?
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Old 04-21-2010, 07:47 PM   #4
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The way I reinstall engine bearings is I heat the block up and freeze the bearing. I took an old deep well socket that was the same size as the outer race of the rear bearing and use it as a tool to tap the rear bearing in. If you heat the engine to around 250 for about 15 min. and freeze the rear bearing for about 30 min. it will just about fall into place with little effort. I do the same for the front bearing.
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Old 04-21-2010, 07:48 PM   #5
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yes you can. it shrinks them up a little but they gotta sit in there for a while. so if you are looking to re-install now then probably not an option
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Old 04-21-2010, 07:54 PM   #6
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Thanks for all the advice guys.

I just put the bearings into the freezer, thinkin ill leave them in there for an hour before doing anything.
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Old 04-21-2010, 09:16 PM   #7
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Here are some instructions that also have some pictures to help a little.

http://www.rbproducts.com/mainEn.php...ncept%20engine
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Old 04-22-2010, 08:53 AM   #8
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Thanks, that really helps. I heard that one can put the bearings in the freezer to help with the re-installation. Have you heard or experimented with this?
Freezing the bearings is not required if you heat the block enough. It does not hurt though and does make things easier. I think I remember someone telling me that your engine block can be heated to 300 degrees with no worries. 275 usually does the trick
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Old 04-22-2010, 11:45 AM   #9
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hello there,

i use this,

http://www.amainhobbies.com/product_...g-Bearing-14mm

its a tool made for this purpose. pricey but worth every cent, it centers/aligns both rear and front before installation and with 5-6 gentle taps with a rubber head hammer), the job is done.


cheers
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Old 04-22-2010, 11:49 AM   #10
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Thanks to everyone for their advice. The re-install went relatively well but was time consuming. Not a job I look forward to do again soon.
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Old 04-22-2010, 12:59 PM   #11
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Quote:
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Thanks, that really helps. I heard that one can put the bearings in the freezer to help with the re-installation. Have you heard or experimented with this?
Mugen whatever you do dont put the bearings in the freezer BAD BAD BAD. Condensation will form when you put the cold bearings back in the block and will cause them to rust around the bearing and block and sometimes the balls in the bearings. Heat the block and you will be fine.
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Old 04-22-2010, 01:15 PM   #12
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I hope you put the rear bearing facing the right way! You should see the side of the bearing with the shield off facing the rear of your engine.
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Old 04-22-2010, 03:10 PM   #13
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Thanks to everyone for their advice. The re-install went relatively well but was time consuming. Not a job I look forward to do again soon.
when you say time consuming, how long did it take you??
if you use the right tools and you get used to them, it should take you no more than 20 minutes to take the engine apart, take out the bearings and install the new ones and than put the engine back together.

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Old 04-22-2010, 05:26 PM   #14
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i never freeze the bearings. If you heat the block enough it doesn not matter. Forget a wooden dowel and get a rubber mallet. It will get the front bearing perfect. for the rear bearing i put it on the crank, install the crank and then put a flywheel on it and tighten it. you can take the flywheel off or leave it on after it cools.

There is NO WAY your bearings wont be seated properly. The flywheel also makes the front bearing seat properly if by some strage reason you missed something with the rubber mallet.

To be honest i have never tried a wooden dowel. But on my first engine rebuild i used a ball peen hammer

If you heat your block to over 300 (i go 350) make sure you are using quality bearings with good seals. I got a duratrax engine bearing once to put in at 350 degrees and it melted the rubber seal. But o.s., nova's, tko's etc there is zero chance of that happening.

That's what you get for going cheap!!!!
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Old 04-22-2010, 06:30 PM   #15
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It took me about an 30-45 mins to re-install the bearings because I wasnt getting the engine block hot enough and also I didnt have the right tools which made it more challenging.

Aaron - No worries I installed the rear bearing the right way.
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