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Crank Grooved by Old Front Seal - Question 200 1981

posted by  DougC on  Sun Feb 16 18:36 CST 2003
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last visit: Sun Aug 10 08:30 CST 2014
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After taking off the front seal carrier and inspecting the crankshaft end, I find it has a groove in it about midway on the visible part of the shaft where the old seal must have ridden. Bentley says to seat the new seal 2mm deeper in the carrier. The crank is stained and cruddy from the groove toward the engine which is where the new seal will ride if I follow Bentley's recommendation. I can get the stain crud off with laquer thinner, but it is slow going. Can I use steel wool, or 1000 grit wet/dry paper? What is recommended? Does the Bentley recommendation of 2mm deeper work out most of the time? I don't want this thing to leak when I'm done.
--
Thanks to everyone for the help, Doug C. 81 242 Brick On Blocks, stock; 86 240, 129K








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    Crank Grooved by Old Front Seal - Question 200 1981

    posted by  Don Foster on  Mon Feb 17 01:17 CST 2003
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    You can dissolve the varnish using lacquer thinner or carb cleaner or any strong industrial hydrocarbon solvent (use ventilation, avoid fumes, avoid sparks, use gloves). I'd not use steel wool or sandpaper, since that might leave microscopic abrasives or steel fibers in the crankcase.

    Seat the seal about 1/16" deeper in the housing. That way, the seal's lip will engage a fresh surface. That has always worked for me.
    --
    Don Foster (near Cape Cod, MA)








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    Crank Grooved by Old Front Seal - Question 200 1981

    posted by  rstarkie on  Mon Feb 17 00:56 CST 2003
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    last visit: Fri Oct 24 10:14 CST 2014
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    The light abrasives you mention are fine and will speed the clean up- just make sure you remove all the residue before installing the new seal. There really is a lot of latitude in seal placement, just make sure you have the new seal riding on an unworn portion of the shaft.

    I always coat the shaft and seal with white lithium grease- nothing special about white lithium, it's just what I have available. This helps the seal slip into place without binding up. Always start the seal so that the shaft does not press all the way around the lip as there is the danger of it folding enough to allow the spring to come out of position which can result in leakage after installation.

    Randy







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