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D8800 bearing HELP?

D8800 bearing HELP?

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ruakina cat
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Hi not to good at writing so I will try to keep this simple. 4H3008
The crank is a 3.250 but is worn to .345 I will not be pulling the crank out to grind it. Next is the bearing problem as they are worn out, when clamped in the rod and measured shells are at 3.260-3.265 I do not have a parts book for this engine so the numbers on the shells do not show in the other books I have.
What I would like to know is a measure for the shells of the part numbers in the pics if that is possible and if you can still buy them or something that will do the job. This engine will only be run 1 hour a year. Any help would be good thanks.
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Tue, Oct 27, 2015 3:24 PM
Old Magnet
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Here is what info I have based on my old Federal Mogul Catalog.
D8800
4H3008 - 4H3268
Fits
Diesel 50, D7, RD7, D7700, D8800
Crank 3.2490/3.2500" (rods)
Oil clearance 0.0045/0.0060
Max bearing bore in rod = 3.593"
ID = 3.2548"
Length = 2.933"
Wall thickness= 0.16875/0.16900"

Basic FM bearing number is 1010B which is a precision bearing, no shims.

Also 7B7370/71 is replaced by 6B6639 or 5F2914(lower) and 6B6619 (upper)
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Tue, Oct 27, 2015 11:40 PM
edb
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Reply to Old Magnet:
Here is what info I have based on my old Federal Mogul Catalog.
D8800
4H3008 - 4H3268
Fits
Diesel 50, D7, RD7, D7700, D8800
Crank 3.2490/3.2500" (rods)
Oil clearance 0.0045/0.0060
Max bearing bore in rod = 3.593"
ID = 3.2548"
Length = 2.933"
Wall thickness= 0.16875/0.16900"

Basic FM bearing number is 1010B which is a precision bearing, no shims.

Also 7B7370/71 is replaced by 6B6639 or 5F2914(lower) and 6B6619 (upper)
Hi RC,
you may be able to get your bronze backed shells re-babbitted local and you can then cut the clearances down to specs. by making them thicker than standard to account for the wear on your journals--may not be cheapest option but would get by your worn crank.

OM has given you the standard running clearances as 0.0045"-0.006"
Max. clearance for those big end shells from the SRB is given as 0.015"

Max wear on big end journal is given as 0.009" and max. ovality as 0.007"
Cheers,
Eddie B.
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Wed, Oct 28, 2015 6:55 AM
ruakina cat
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Reply to edb:
Hi RC,
you may be able to get your bronze backed shells re-babbitted local and you can then cut the clearances down to specs. by making them thicker than standard to account for the wear on your journals--may not be cheapest option but would get by your worn crank.

OM has given you the standard running clearances as 0.0045"-0.006"
Max. clearance for those big end shells from the SRB is given as 0.015"

Max wear on big end journal is given as 0.009" and max. ovality as 0.007"
Cheers,
Eddie B.
Thank you OM for spending the time to upload that information as that is perfect. Yes edb have dropped one off at the local man to thick about building them back up but as you say the cost may out way everything. Have pulled a set of pistons out of a later model 3T engine so will be using them but as you know the crank is bigger in that so rods and shells no good to me. Thanks for help
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Wed, Oct 28, 2015 2:15 PM
Andrew
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Reply to ruakina cat:
Thank you OM for spending the time to upload that information as that is perfect. Yes edb have dropped one off at the local man to thick about building them back up but as you say the cost may out way everything. Have pulled a set of pistons out of a later model 3T engine so will be using them but as you know the crank is bigger in that so rods and shells no good to me. Thanks for help
While the purists may not agree, it is possible tighten bearings using shims as pictured .
Use a piece of solder across the bearing in the worn section and bolt the rod to the journal .
Remove the solder and Mike the thickness of the solder.
Aim for the larger end of the spec. Range.
You would not do this for something you are using all day everyday. Will be fine for what you are doing.
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Thu, Oct 29, 2015 6:04 AM
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