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  #1  
Old 12-16-2010
Robert Britton Robert Britton is offline
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Default Allison filter change

Changing fluid and filters today in the Allison transmission. I noticed when I removed the bolts for the filter cover plates that they had some kind of thread seal on the bolts. It looks like the kind that is on DOT brass air fittings when you buy them (orange color)

Question is…do I need to put some thread seal or lock tight on the bolts before reinstalling them? I have some Napa Teflon thread seal, will that work?
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Old 12-16-2010
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that is some locktie product that seals and will not move....look up their line
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Old 12-16-2010
Robert Britton Robert Britton is offline
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Been looking online…Allisonman (online Q&A) states that Allison used some stuff like thread lock from the factory. His recommendation is to install and torque to spec and not use any thread lock. Guess I’ll go with that.
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Old 12-16-2010
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Just torque them as recommended. I serviced a friends Allision trans, torqued the bolts, no leaks.
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Old 12-19-2010
Dan & Cindy Dan & Cindy is offline
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I cleaned up the threads and torqued them to spec. No leaks!
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Old 12-19-2010
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Quote:
Originally Posted by Dan & Cindy View Post
I cleaned up the threads and torqued them to spec. No leaks!
Good.
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Old 01-14-2011
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I can verify this is correct. Torque specs are 38-42 ft/lbs. Just remember the steel bolts are threading into the aluminum transmission housing. So NEVER use impact guns or wrenches while servicing your filters. If the threads get stripped the entire control module has to be removed and a jig has to be mounted. This way the holes can be bored out larger to fit steel Keenserts for the treads. This is normally an 8 hr job plus parts, so it can be a little expensive.
I normally recommend torque the bolts on the low end of the specification to 38 ft/lbs, due to this.
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Old 01-14-2011
Robert Britton Robert Britton is offline
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Quote:
Originally Posted by scott View Post
I can verify this is correct. Torque specs are 38-42 ft/lbs. Just remember the steel bolts are threading into the aluminum transmission housing. So NEVER use impact guns or wrenches while servicing your filters. If the threads get stripped the entire control module has to be removed and a jig has to be mounted. This way the holes can be bored out larger to fit steel Keenserts for the treads. This is normally an 8 hr job plus parts, so it can be a little expensive.
I normally recommend torque the bolts on the low end of the specification to 38 ft/lbs, due to this.
Thanks for chiming in Scott…I went with 40 ft/lbs torque. You don’t recommend any thread lock correct?
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  #9  
Old 01-15-2011
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Quote:
Originally Posted by Robert Britton View Post
Thanks for chiming in Scott…I went with 40 ft/lbs torque. You don’t recommend any thread lock correct?
That is correct.

If you felt you just "had" to use Loctite. Only use the blue (medium) type. It is better for aluminum.
But I would STRONGLY recommend against it. It still could have a chance to “pull” out the aluminum threads in the trans case after repeated filter changes.

As for Loctite composition type on bolts.
Red is for Steel
Blue is for Aluminum
Green is for holding 2 steel items pressed together. **Do not use for threads**
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