Micael
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| posted on 5/10/07 at 04:05 PM |
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Big en bearing and Main bearing
Hi guys,
What's the difference between main bearings and Big end bearings?
I have to buy some new bearing to my Zetec and on ebay some sells big end bearings and other sells main bearing.
I need all "bottom" bearings (crank and conrods).
Micael Moose Åman
Petrolhead and all around nice guy
"Don't leave the duck there. It's totally irresponsible. Put it on the swing, it'll have much more fun." //Sleep Talkin Man Dec 23
2009
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mookaloid
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| posted on 5/10/07 at 04:07 PM |
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Mains are the Crank bearings, Big ends are the bearings in the conrods where they attach to the crank.
HTH
Mark
"That thing you're thinking - it wont be that."
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Micael
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| posted on 5/10/07 at 04:11 PM |
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Thanks,
So will need both sets then. 
Micael Moose Åman
Petrolhead and all around nice guy
"Don't leave the duck there. It's totally irresponsible. Put it on the swing, it'll have much more fun." //Sleep Talkin Man Dec 23
2009
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ash_hammond
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| posted on 5/10/07 at 04:12 PM |
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Be careful tho there are different sized bearings. Best thing to do if your not sure what size they are is take them to ur local engine builder and
he will be able to supply you with the correct size. Fitting the wrong size bearings can create all sorts or problems even engine death.
.: www.mac1motorsports.co.uk | www.m1moc.com :.
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ash_hammond
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| posted on 5/10/07 at 04:15 PM |
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If you require all bottom end bearings then you so need big end and main bearings
big end bearings is the place were the con-rod connects to the crank.
Main bearings are what the crank sits in and turns.
.: www.mac1motorsports.co.uk | www.m1moc.com :.
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Micael
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| posted on 5/10/07 at 04:17 PM |
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I haven't removed the crank yet, but this is how the pistons and head looks like
[Edited on 5/10/07 by Micael]
[Edited on 5/10/07 by Micael]
Micael Moose Åman
Petrolhead and all around nice guy
"Don't leave the duck there. It's totally irresponsible. Put it on the swing, it'll have much more fun." //Sleep Talkin Man Dec 23
2009
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Micael
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| posted on 5/10/07 at 04:18 PM |
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sorry, forgot the picture.jpg)
Micael Moose Åman
Petrolhead and all around nice guy
"Don't leave the duck there. It's totally irresponsible. Put it on the swing, it'll have much more fun." //Sleep Talkin Man Dec 23
2009
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Micael
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| posted on 5/10/07 at 04:19 PM |
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And the head.jpg)
Micael Moose Åman
Petrolhead and all around nice guy
"Don't leave the duck there. It's totally irresponsible. Put it on the swing, it'll have much more fun." //Sleep Talkin Man Dec 23
2009
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Paul TigerB6
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| posted on 5/10/07 at 05:07 PM |
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Until you get the crank out and check for any signs of wear that may require machining, you wont know what size bearings you will need. The crank may
even have been machined previously so requiring oversized (or is that undersized) bearings.
* edited after realising you already stated the crank was still not removed
[Edited on 5/10/07 by Paul TigerB6]
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Micael
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| posted on 5/10/07 at 07:04 PM |
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I plan to remove the crank tomorrow.
I suspect that it is a big end bearing failure that has cause the piston hitting the head.
Micael Moose Åman
Petrolhead and all around nice guy
"Don't leave the duck there. It's totally irresponsible. Put it on the swing, it'll have much more fun." //Sleep Talkin Man Dec 23
2009
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pewe
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| posted on 5/10/07 at 08:02 PM |
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Whilst you are at it check for end float on the crankshaft. That's movement of the crank backwards and forwards along the block. You should be
able to check this with feeler guages and find out the acceptable tolerance from either the workshop manual or google it. Don't ignore it if
it's too much as it can affect the ability of the crankshaft oil seals to seal as well as wear on connecting components.
You should buy a bottom end gasket set which should include these seals. New shims to control end-float from your dealer or engine component supplier.
Finally make sure you know where they all go when you take the crank out as they are split (like half moons) and should go back in as pairs, in the
same position and facing the same way as originally.
Cheers, Pewe 
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MikeRJ
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| posted on 11/10/07 at 11:12 AM |
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quote:
Originally posted by Micael
I suspect that it is a big end bearing failure that has cause the piston hitting the head.
In which case you will be lucky if you can just put new bearings in. It's quite likely the crank will need to be reground if the bearing has
gone badly enough to let the pistons hit the head.
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.JPG)
