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Post by bretty on Dec 5, 2012 22:54:10 GMT 1
Just had a debate at work regarding engine rebuilds and oiling main and conrod shells when rebuilding yhe engine. Some people are saying you shouldnt oil both sides of the shells some are saying you should. I personally do as it makes sliding shells into place easier and it helps to hold yhe shells in place when putting the pistons in etc and you always get an bit of oil behind the shells regardless when the engine is built and running.
So whats everyones opinions?
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Post by Rhubarb on Dec 5, 2012 23:10:17 GMT 1
I'd say nice and oily on the front face and either dry or a slight mist on the back face  Start a poll  |
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Post by Dragon on Dec 5, 2012 23:25:36 GMT 1
I was taught at college to only oil the bearing side/front face.
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Post by bretty on Dec 5, 2012 23:54:23 GMT 1
When i say oil back face i only mean a little tiny bit not a lot. Obviously plenty on the front face.
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Post by studabear on Dec 6, 2012 0:14:16 GMT 1
I would have said none on the back |
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rebel
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Post by rebel on Dec 6, 2012 0:39:02 GMT 1
Not opinion, but fact - Never oil the back of the shells!
The correct running clearence will only be obtained when the bearing shells are fully seated in their housings - metal to metal.
Oiling the back of the shells will prevent them from fully seating, which will reduce the running clearence and lubrication at the working surface.
I know of a case where a fitter dipped shells in a pot of gear oil before fitting them and when he torqued the caps up the crank was locked solid.
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Post by sorted on Dec 6, 2012 9:34:58 GMT 1
I agree clinically clean back and block / rod - I always fit the shell to a clean dry housing then oil liberally. It does indeed make a different to ease of rotation after initial assembly. |
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Post by teflon on Dec 6, 2012 23:32:01 GMT 1
dry at back for me too
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Post by Steve Parker on Dec 7, 2012 21:43:34 GMT 1
I was allways told to leave in tub of oil while doing other bits "to allow oil to soak in" and then fit wet  |
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Deleted
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Post by Deleted on Dec 7, 2012 23:37:05 GMT 1
Fit dry with a bit of grit off the floor ;D
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Post by sorted on Dec 8, 2012 20:45:21 GMT 1
I was allways told to leave in tub of oil while doing other bits "to allow oil to soak in" and then fit wet Good practice with phospher bronze bushes and the like but but modern shells don't absorb oil. Next time you fit a crank try oiling the shells both sides, torque up and check the torque required to turn it. then try again with shells fitted dry and just the bearing surfaces oiled, I bet the results speak for themselves.. |
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Post by krashbandikoot on Dec 9, 2012 18:44:24 GMT 1
I can't say I've ever oils up shells when doing a rebuild as filling the crank with oil gets them all nice and oiled up anyway so it's a bit of a waste of time.
If they don't snap into place and seat nicely dry then they're not seated properly so you need to start again.
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Deleted
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Post by Deleted on Dec 9, 2012 18:53:15 GMT 1
See some old forum crap appearing!
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Post by Rhubarb on Dec 9, 2012 19:16:29 GMT 1
See some old forum crap appearing! eh, what's up? |
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Post by sorted on Dec 9, 2012 20:10:38 GMT 1
See some old forum crap appearing! Confused   |
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