Mopar RobbMc mini starter

[493 Mike]

The RobbMc starter is currently in at a shop being looked at. Got a call that there is a fork made out of cast pot metal where when the solenoid is energized it pulls the fork back which then pivots the bottom of the fork forward which then throws the bendex gear out to engage the flywheel.

And it's broken?
Mike

 

[rww124]

And it's broken?
Mike

Yes, in 3 places. Called RobbMc to see if the Gen 1 fork is the same as the Gen 2 and was told they are different. So much for getting a new fork.

 

[rww124]

Yes, in 3 places. Called RobbMc to see if the Gen 1 fork is the same as the Gen 2 and was told they are different. So much for getting a new fork. View attachment 1617935

Someone from my local Mopar association sent me this information, not sure if this stuff will work or not.

Super Alloy 1 Multi-Metal and Pot Metal Solder​

$69.00 – $109.00
Super Alloy 1 is a low-temperature multi-metal and pot metal solder that bonds all white metals and can also join white metals to practically any other metal–even ferrous to non-ferrous metals, like steel to aluminum.
Super Alloy 1 bonds metals at half the melting point of pot metal; its honey flux turns root beer brown when the base metal has reached the 350°F working temperature, enabling quick and easy soldering repairs with little or no preheating. This all position rod is ideal for repairing pot metal pitting and can be applied with any heat source including a soldering gun, heat gun, or propane torch with no welding expertise.
The industry standard for classic car restoration and antique auto applications, Super Alloy 1 has salvaged thousands of priceless classic car parts!

Key Features:

• Solders: pot metal, aluminum, galvanized metal, copper, brass, bronze, steel, zinc die cast, pewter, zinc plated steel, lead, zamak, monkey metal
• Bonds dissimilar metals: brass to aluminum, copper to stainless etc
• Low working temperature – 350°F – prevents warpage and base metal damage; favored in applications requiring low heat
• High wettability
• Works with: propane, MAPP gas, oxyacetylene, butane, heat gun, larger soldering irons, ovens
• Flux turns root-beer brown when the parent metal reaches 350°F, acting as an absolute temperature guide
• Can be plated, painted, powder coated, polished, shaped, build-up missing pieces
• Completely non-corrosive; washes off with warm water
• 20,000 psi bonding strength

Note: Super Alloy 1 cannot be used to repair aluminum boats, cast aluminum, large aluminum masses, or diamond plate aluminum. Super Alloy 5 and an oxyacetylene torch are required for these applications. For castings thicker than 1/8″ we recommend beveling the base metal with a grinder prior to soldering.

 

[493 Mike]

Even if you successfully join this together, will it withstand another event like the one that broke it originally? It could fail at a different point. Now, if you have a machinist friend, you have a good pattern to scan for a CNC machined replacement made from billet aluminum. A big if!
Mike

 

[rww124]

Even if you successfully join this together, will it withstand another event like the one that broke it originally? It could fail at a different point. Now, if you have a machinist friend, you have a good pattern to scan for a CNC machined replacement made from billet aluminum. A big if!
Mike

I haven't enquired as yet about CNC machining however did leave a message for the professor who heads up their 3D printing department at our city's University. If I was able to get a new fork CNC machined from billet aluminum would the billet aluminum be as strong as the cast pot metal and if the same event that broke my original fork would the billet piece break of destroy the entire starter? It will all come down to final cost as I have emailed RobbMc to ask if they still make these forks out if cast pot metal or have they improved their materials. Not sure sure which direction to go right now. If I could find someone in Winnipeg who can make a new fork that would work best.

 

[493 Mike]

I haven't enquired as yet about CNC machining however did leave a message for the professor who heads up their 3D printing department at our city's University. If I was able to get a new fork CNC machined from billet aluminum would the billet aluminum be as strong as the cast pot metal and if the same event that broke my original fork would the billet piece break of destroy the entire starter? It will all come down to final cost as I have emailed RobbMc to ask if they still make these forks out if cast pot metal or have they improved their materials. Not sure sure which direction to go right now. If I could find someone in Winnipeg who can make a new fork that would work best.

Billet aluminum is much stronger than a cast white metal. White metal is used to save on costs.
Mike