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Dan1950

Dan1950

1974 MK II Roadster
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After my botched attempt to install bearings in my gearbox, I decided to get some tools so that I'm no longer working blind.

I made a trip to the local Harbor Freight and picked up these.

(More) New Toys


(More) New Toys


Some of the negative reviews cited that the Vernier's were not calibrated properly. There were no instructions but the spanner pictured above the calibration gauges suggested that the calibration might be adjustable. After examination I found a hole in the barrel that the spanner wrench fit into. Viola', after some trial and error I had a set of properly calibrated micrometers.

They appear to be accurate to + or - .0005", plenty accurate for my use.

I found that the inner case bearing has a .0015" interference fit in the cover at room temperature. The Sleeve gear bearing has .001" interference fit at room temperature in the case.
 
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Dan1950 said:
I found that the inner case bearing has a .0015" interference fit in the cover at room temperature. The Sleeve gear bearing has .001" interference fit at room temperature in the case.
Click to expand...
From those measurements it should be clear that a press is not needed just some heat. Some use an oven, some a grill, I use a handheld propane torch. If you wanted to be completely safe, boiling water.

Did you measure the OD of the sleeve gear verses the ID of its bearing?

BTW, when I've measured, I've come closer to 0.002" on the sleeve gear - hopefully yours will be tight enough. The Inner cover I've found to be 0.000-0.0015. At 0.000 it's fine since it is clamped in place.
 
marshg246 said:
From those measurements it should be clear that a press is not needed just some heat. Some use an oven, some a grill, I use a handheld propane torch. If you wanted to be completely safe, boiling water.

Did you measure the OD of the sleeve gear verses the ID of its bearing?

BTW, when I've measured, I've come closer to 0.002" on the sleeve gear - hopefully yours will be tight enough. The Inner cover I've found to be 0.000-0.0015. At 0.000 it's fine since it is clamped in place.
Click to expand...
Since the sleeve gear bearing would not be usable after being pushed out of the case with force on the inner race and pulling it off the sleeve gear would have placed further stress on it, I used a diamond wheel and chisel to split the inner and outer races of the bearing to get it of the sleeve gear.

Kaman will have a new bearing for me in the morning to verify, but if the ID of the bearing is indeed 1.250:", there will be about .0015" interference fit. If necessary I will have the OD of the sleeve gear turned down for a snug slip fit.
 
Last edited:
Dan1950 said:
Since the sleeve gear bearing would not be usable after being pushed out of the case with force on the inner race and pulling it off the sleeve gear would have placed further stress on it, I used a diamond wheel and chisel to split the inner and outer races of the bearing to get it of the sleeve gear.

Kaman will have a new bearing for me in the morning to verify, but if the ID of the bearing is indeed 1.250:", there will be about .0015" interference fit. If necessary I will have the OD of the sleeve gear turned down for a snug slip fit.
Click to expand...
Measuring will be interesting. Bearings are usually extremely accurate on sizing. I'm sure you know but measure the OD of the sleeve gear in several places. You may have a burr or two. It may only need a little time with 320-400 grit paper - cut to the right width, wrap it around the area and twist the sleeve gear. Be sure nothing gets inside! Check often in the bearing. I always make sure they it before installing the bearing.
 
marshg246 said:
I'm sure you know but measure the OD of the sleeve gear in several places.
Click to expand...
The first 3/8" or so of the OD adjacent to the splines that enters the sleeve gear is a snug slip fit, but the non-splined portion from there to the shoulder of the gear itself has a very slight "step" that is barely evident to the naked eye. With the dial calipers I was getting .002" increase in diameter but the micrometer has it closer to .0015"
 
Dan1950 said:
The first 3/8" or so of the OD adjacent to the splines that enters the sleeve gear is a snug slip fit, but the non-splined portion from there to the shoulder of the gear itself has a very slight "step" that is barely evident to the naked eye. With the dial calipers I was getting .002" increase in diameter but the micrometer has it closer to .0015"
Click to expand...
My fault. I didn't mean along the length, I meant in several places around the shaft where it sits in the bearing. In other words, is it round? I've lost track - is this a new sleeve gear?
 
marshg246 said:
My fault. I didn't mean along the length, I meant in several places around the shaft where it sits in the bearing. In other words, is it round? I've lost track - is this a new sleeve gear?
Click to expand...
It is round and and yes it is a new sleeve gear. The original had some wear on the teeth so I replaced the "set".
 
Dan1950 said:
The first 3/8" or so of the OD adjacent to the splines that enters the sleeve gear is a snug slip fit, but the non-splined portion from there to the shoulder of the gear itself has a very slight "step" that is barely evident to the naked eye. With the dial calipers I was getting .002" increase in diameter but the micrometer has it closer to .0015"
Click to expand...
Here is a picture of a new AN sleeve gear that is a snug slip fit: https://www.gregmarsh.com/images/temp/SleeveNew.jpg There is no step. This is the two circlip version. if you still have a problem and you bought directly from AN, I would write to: technical@andover-norton.co.uk and explain the problem. It is possible that yours was not properly finished on the outside.
 
marshg246 said:
Here is a picture of a new AN sleeve gear that is a snug slip fit: https://www.gregmarsh.com/images/temp/SleeveNew.jpg There is no step. This is the two circlip version. if you still have a problem and you bought directly from AN, I would write to: technical@andover-norton.co.uk and explain the problem. It is possible that yours was not properly finished on the outside.
Click to expand...
If you look very closely at you photo, you can see a very faint line just outboard of the end of the splines where it appears that the OD is slightly larger. The original sleeve gear does not have this discrepancy and it the two circlip version too.
 
Dan1950 said:
If you look very closely at you photo, you can see a very faint line just outboard of the end of the splines where it appears that the OD is slightly larger. The original sleeve gear does not have this discrepancy and it the two circlip version too.
Click to expand...
It's not there - I've measured, and it is a snug slip fit from just past the threads all the way in. Don't have a new bearing in stock but I tried it in a gearbox with an old bearing. I can't find my 2" micrometer (probably loaned out) so had to measure with calipers which I've verified that measure 0.010" short. They say 1.239 so 1.249, My other caliper that measure 0.001" long says 1.250. Both find no step.
 
marshg246 said:
It's not there - I've measured, and it is a snug slip fit from just past the threads all the way in. Don't have a new bearing in stock but I tried it in a gearbox with an old bearing. I can't find my 2" micrometer (probably loaned out) so had to measure with calipers which I've verified that measure 0.010" short. They say 1.239 so 1.249, My other caliper that measure 0.001" long says 1.250. Both find no step.
Click to expand...
Well the sleeve gear and new bearing are at the machine shop. They will probably just chuck it in a lathe and use some Emory to reduce the OD. There is a very slight interference fit with the new gear, the original is a snug slip fit. If I had any way to chuck the sleeve gear I could probably dress it with Emory and get the fit desired.
 
Dan1950 said:
Well the sleeve gear and new bearing are at the machine shop. They will probably just chuck it in a lathe and use some Emory to reduce the OD. There is a very slight interference fit with the new gear, the original is a snug slip fit. If I had any way to chuck the sleeve gear I could probably dress it with Emory and get the fit desired.
Click to expand...
While in the hands of the machinists, can you have him check other machined features? Just me, but when I find a defect like that, it begs the question, what ELSE is wrong? For instance, the gear teeth surface finish, the last 8 gears I bought were horribly torn/redeposited metal, and then hardened that way. I lost the images in a cell phone crash though.
 
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