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Engine main bearing difference s


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#1 boostinmini

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Posted 31 May 2017 - 09:39 AM

Hello

I am currently rebuilding a 4d56 which is very similar to a 2.6, even same part number for engine bearings

Question I have is I got a set if clevvitte main bearings and according to the manual I I should have  grooved bearings for the top and noon grooved for the bottom but they all appear to be grooved, what should I do?

Is this normal?





#2 Guest_STARION_NORTH_*

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Posted 31 May 2017 - 09:48 AM

Fully grooved main bearings allow for a full 360-degree crank oiling. The downside to having the groove in the bottom half bearing shell is that it reduces the load carrying surface area.

#3 boostinmini

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Posted 31 May 2017 - 09:53 AM

Is it normal for mine to be fully grooved?

#4 Guest_STARION_NORTH_*

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Posted 31 May 2017 - 10:11 AM

http://www.enginebui...on-performance/

Hope this helps.

Edited by STARION_NORTH, 31 May 2017 - 10:16 AM.


#5 boostinmini

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Posted 31 May 2017 - 10:31 AM

Ok interesting read, so I thought clevitte bearings where the go to standard?

Maybe these are very old stock?

Since this is a diesel, fully grooved seems like a bad idea

#6 Guest_STARION_NORTH_*

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Posted 31 May 2017 - 11:05 AM

I would guess that they are either old stock or just simply a standard replacement for the original design? Are the original bearings from the motor fully grooved? I don't believe Clevite would take the time to re-engineer a design that was already working. Does the catalog call for the same part number for both the 4G54 and the 4D56?

Edited by STARION_NORTH, 31 May 2017 - 11:06 AM.


#7 boostinmini

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Posted 31 May 2017 - 03:27 PM

Yes same part number for both engines the original ones were full bearings on the bottom, this diesels going to be hopped up so I need things to last I feel like maybe I should change the bearings before I get too far end

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Posted 31 May 2017 - 06:02 PM

Interesting, maybe Dad can tell us if the different brand bearings he carries are full groove or not?

#9 Dad

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Posted 01 June 2017 - 11:31 AM

If its the same part number for the 2.6  then I suspect you got a set packaged wrong.  Should be no groove lower bearings.

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#10 boostinmini

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Posted 01 June 2017 - 11:46 AM

I googled the part number, it said full groove main bearings, I can find many other sets that are full groove.

I am starting to feel strongly that I would not run them

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Posted 01 June 2017 - 03:22 PM

Dad, what brands have you used that are not full groove? Would be nice to know for my own engine build.

#12 Dad

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Posted 01 June 2017 - 09:36 PM

Clevite and sealed power bearings for the 2.6 are not full grooved.

#13 G54Bstore

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Posted 02 June 2017 - 08:50 AM

View PostDad, on 01 June 2017 - 09:36 PM, said:

Clevite and sealed power bearings for the 2.6 are not full grooved.
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