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Thread: Using a bearing install tool to install seals

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    Frank S's Avatar
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    Aug 2015
    Peacock TX
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    Using a bearing install tool to install seals

    Many are following my several threads of the tools I made for the rebuild of a Ford/ Masda 7.5 LS differential
    I made mention in the thread Axle bearing install tool Of how I planed to use the same tool to install the axle seals.
    Here's the tip when installing an oil seal that has a spring under the lip it is always best to have an install tool which emulates the shaft which is going to be running in it. The reason for this is not all, but in some of the seals the spring can be dislodged when installing if there is no sealing surface present. For this reason alone I like to use a tool which protrudes through the seal itself while I am installing it.
    Since my tool that I made was machined so it could set the bearing deep in the housing to its stop it would only work to install the seal if the seal had a flange like the original factory seal. My replacement seals did not.
    My solution rather than machine anohter tool I decided to simply use a couple of left over thick shims that came in the master rebuild kit. this limited the install tool to striking against the housing and insureing that the seal was installed to the proper depth and square
    Using a bearing install tool to install seals-20180715_124234.jpgc.jpg

    Using a bearing install tool to install seals-20180715_124316.jpgc.jpg
    Another thing I do is to use a thin amount of sealant on the seal housing. My reason for doing this is sometimes the part that the seal is being installed in can have some damage to the surface the sealant helps to prevent leakage between the seal and the part.
    Using a bearing install tool to install seals-20180715_124645.jpgc.jpg
    Seal installed Also you may note the bearing has been pre lubed with the same lubricant that will be running in the diff. My reason for this is Grease and oils are not always readily compatible the presents of a small amount of grease will not contaminate the lube but also it takes time to be broken down and mixed with the lube, meaning the bearing could run dry before the lube ever gets past a glob of grease.
    Additionally I prefer lubes with a high sticktion (SP) or akin to molasses in its ability to stay put.
    Using a bearing install tool to install seals-20180715_125440.jpgc.jpg
    Links to the other threads which explain more on the rebuilding of a rear end
    Slide hammer bearing puller adapter
    Handle for my bearing tools
    Pinion shaft bearing race install tool
    Single hole adjustable spanner wrench
    Pinion shaft bearing install tool
    For setting the preload as mentioned in another thread and not shown since I didn't get a picture of the process. What you need to have is a torque wrench with a dial that reads in inch lbs. the factory specs for this diff were from 20 to 28
    while the ring gear to pinion gear backlash was to be .008 to .012"
    Using a bearing install tool to install seals-20180715_132508.jpgc.jpg
    Right in the range
    Using a bearing install tool to install seals-20180715_132519.jpgc.jpg
    Should be no problems with this rear end for the life of the pickup.

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