Layshaft bearing removal from the case in situ

Jonez69

Jonez69

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Performing my first AMC gear box rebuild on my 1973 850 Roadster. Indeed, I found the famous Portuguese layshaft bearing and plenty of bronze. My layshaft bearing refused to come out with the shaft the first time, so I put the shaft back into the inner race, applied heat, but no joy. Any tricks I haven't found searching here? Will a blind bearing puller do the job? Any advice will be appreciated! Thanks!

Layshaft bearing removal from the case in situ
Layshaft bearing removal from the case in situ
 
Jonez69 said:
Performing my first AMC gear box rebuild on my 1973 850 Roadster. Indeed, I found the famous Portuguese layshaft bearing and plenty of bronze. My layshaft bearing refused to come out with the shaft the first time, so I put the shaft back into the inner race, applied heat, but no joy. Any tricks I haven't found searching here? Will a blind bearing puller do the job? Any advice will be appreciated! Thanks!

View attachment 118935View attachment 118936
Click to expand...
Yes, heat it and pull it with tool of choice
 
Another thought, I didn't need to do this for my transmission bearings, but I heated up my engine cases in my barbeque grill. This resulted in a very satisfying 'clank' when the main bearings fell out. Then I used oven mitts to slide the new bearings in before the cases could cool. (one at a time)
 
Apply heat to get the gearbox case hot so water sizzles on the case and hit the case from the primary side, use a big block of wood and hammer the wood.
 
I replaced the infamous layshaft bearing in my 73 Commando with the gearbox case in place using a blind puller from either Autozone of Orielly. It was necessary to grind a bit of metal from the "feet" to round them slightly and sharpen them slightly to be effective. Heating the case is required, of course. I used a propane torch playing it constantly to prevent overheating any one area.

Photos: To me, the metal flakes look like residue from worn shift forks and possibly bushings (bushes).
Russ
 
kommando said:
Apply heat to get the gearbox case hot so water sizzles on the case and hit the case from the primary side, use a big block of wood and hammer the wood.
Click to expand...
I did that gently yesterday, but didn't want to get carried away. I also have the famous small crack between the bearings.
 
998cc said:
I replaced the infamous layshaft bearing in my 73 Commando with the gearbox case in place using a blind puller from either Autozone of Orielly. It was necessary to grind a bit of metal from the "feet" to round them slightly and sharpen them slightly to be effective. Heating the case is required, of course. I used a propane torch playing it constantly to prevent overheating any one area.

Photos: To me, the metal flakes look like residue from worn shift forks and possibly bushings (bushes).
Russ
Click to expand...
I will be replacing the pinion bushes as well. I am going the easy route and buying the Andover Norton overhaul kit 06-7279.
 
Soinds like you were too lenient with the heat. I did mine in situ, first trying a heat gun, then propane for a good 10 to 15 minutes until water sizzled off the casings. Bearing then slid right out easy. Hemmings DVD shows him flaming away with a huge burner, casing open side facing down resting on bricks on his metal workbench....until the bearing just falls out. Don't worry about over cooking....

I see the crack in your casing, what are your plans, bearing retainer compoind?
 
Atlas Commando said:
Another thought, I didn't need to do this for my transmission bearings, but I heated up my engine cases in my barbeque grill. This resulted in a very satisfying 'clank' when the main bearings fell out. Then I used oven mitts to slide the new bearings in before the cases could cool. (one at a time)
Click to expand...
That's what I do, get it up to around 300F and they drop out. Sometimes I have had to throw a couple of ice cubes on the inner race and tap them out. But normally just some PB Blaster or similar potion, heat, and out they come.
 
Thank you everyone! Using an infrared thermometer I had the case heated up into the 250 range after 15 minutes of constant propane torch heat. The puller only needed a couple of light taps of the slide hammer and the bearing popped out nice and easy! Now I have another tool in the shed when needed!
 
I was fortunate enough to watch John Hudson perform this, using just a blowtorch and a pair of tyre levers placed back-to-back inside the bearing
 
Jonez69 said:
Performing my first AMC gear box rebuild on my 1973 850 Roadster. Indeed, I found the famous Portuguese layshaft bearing and plenty of bronze. My layshaft bearing refused to come out with the shaft the first time, so I put the shaft back into the inner race, applied heat, but no joy. Any tricks I haven't found searching here? Will a blind bearing puller do the job? Any advice will be appreciated! Thanks!

View attachment 118935View attachment 118936
Click to expand...
Maybe a cheap set of these .
 

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