Screen Removal Bargman L-300 Door Handle brakes Satellite Fuel Tank Fire Extinguishers Roof Antenna Tech Talk Forum Shortcut Motor Oil Window Generators headlights batteries Radiator AC Unit Grab Handle Wiper Blades Wiper Blades Door Locks Door Locks Door Locks Door Locks Rims Front Shocks Rear Shocks Front Tires Oil Filter Steps Roof Vent Awning Propane Tank Mirror Info Clearance Lights Clearance Lights Clearance Lights Clearance Lights Clearance Lights Spartan Chassis Gillig Chassis Freightliner Chassis P-32 Chassis MCC Chassis
    Forums    Tech Talk    Patch aluminum
Go to...
Start A New Topic
Search
Notify
Tools
Reply To This Topic
  
Patch aluminum
 Login now/Join our community
 
Supporting Member of Barthmobile.com 6/17
Picture of Richard_Muise
posted
I have a crack in a cover for a small engine tranny. Is there an epoxy that would patch it? It would need to be oil resistant.


R.P.Muise 1994 Breakaway/Cummins 5.9/Allison transmission/Spartan Chassis
 
Posts: 678 | Location: Hampden, Massachusetts | Member Since: 10-13-2005Reply With QuoteReport This Post
Official Barth Junkie
Supporting Member of Barthmobile.com1/21
Picture of Steve VW
posted Hide Post
A good question since there seems to be a huge assortment of epoxy products to choose from.

In general, the five minute/fast set formulas are not completely waterproof, only good for about 200F heat and not as strong.

The strongest formulations are usually slower setting (1-2 hrs or more) They have greater strength, resistance to heat and solvents. The strongest formulas are often combined with powdered metals. (ie JB Weld products)

In this case, if the crack simply needs filling, the epoxy alone should fill and adhere well enough to seal the crack. If the crack is not stable, I would seal it first, then lay a reinforced patch over the area as a second coat. Fiberglass or screen mesh can be used for reinforcement. Be sure there is no oil remaining in the crack, rinse with solvents, blow out with air, etc.

Slow set epoxy should work well.


9708-M0037-37MM-01
"98" Monarch 37
Spartan MM, 6 spd Allison
Cummins 8.3 300 hp
 
Posts: 4761 | Location: Kalkaska, MI | Member Since: 02-04-2011Reply With QuoteReport This Post
Supporting Member of Barthmobile.com 1/21
Picture of Pirate19
posted Hide Post
I recommend Pro-poxy 20 for this application. It is a "full-bodied" epoxy.

As to all epoxies adhesion is the primary concern. I often us a Dremel (various bits do fine) to roughen the surfaces. Then after extensive mixing of the parts I firmly knead some of the product into each roughened surface. I follow by topping with the remainder. With this product you can smooth the finish with a wet finger.

I understand the oil/grease concern. I think this stuff would work. In addition, could you finish with a couple coats of enamel paint?


'92 Breakaway
Cummins 190hp, No Modifications
Allison AT542
Floor Plan 30-BS-11B
9205-3798-30BS11B
 
Posts: 351 | Location: USA | Member Since: 11-07-2014Reply With QuoteReport This Post
Supporting Member of Barthmobile.com 1/21
Picture of Duane88
posted Hide Post
JB weld to me is the best, would not hesitate to use it. 24 hour cure though. Yes rough up the surface a bit prior to spreading it around, if it might move, a stiffener, filler always helps.


25 Ft Glassnose, 2792, 1982
454 Engine
Plain Jane Interior
Original Paint
 
Posts: 1731 | Location: Clinton Iowa | Member Since: 04-02-2017Reply With QuoteReport This Post
  Powered by Social Strata  
 

    Forums    Tech Talk    Patch aluminum

This website is dedicated to the Barth Custom Coach, their owners and those who admire this American made, quality crafted, motor coach.
We are committed to the history, preservation and restoration of the Barth Custom Coach.