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4HP Sandwich Help Needed


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  #1  
Old 05-07-2017, 02:15:12 PM
Rex Piekarczyk's Avatar
Rex Piekarczyk Rex Piekarczyk is offline
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Question 4HP Sandwich Help Needed

Replacing the bearing, shaft, and improvised gear. The gear ran loose eating the shaft shoulder and end of bearing.
I'd like to increase the shaft diameter to provide a better shoulder for the gear and cam.

Anyone have a picture of a complete correct engine I could see? I don't know if this configuration is original.

What's the best technique for removing the shaft from the cam without damaging the cam? Tried a little on the Famco #3 but had no motion. Heat?
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Old 05-07-2017, 04:25:31 PM
Jamesk815 Jamesk815 is offline
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Smile Re: 4HP Sandwich Help Needed

Rex
If you have access to a lathe, i would chuck up the shaft, drill, or bore most of the shaft away, and it well be easy to get the gear off after that. It looks like the gear has been worked on before. The original gear would have been solid cast and would not have had a bushing welded in.also you mite check this site for a original gear since you have a couple teeth missing. Although you can build up the missing teeth if you have to. Making a new shaft should not be a problem either. If the engine were mine, i would take the time to put it back like it was when it left the factory.
Good Luck!
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Last edited by Jamesk815; 05-07-2017 at 04:43:23 PM.
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Old 05-07-2017, 08:01:49 PM
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Doug Kimball Doug Kimball is offline
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Default Re: 4HP Sandwich Help Needed

Rex,
Just did this on a 4 1/2 hp Sandwich. Our trouble was removing the cam gear. Tried a puller & heat with no results. After it cooled it came off with puller alone using much force. Previous owner had peened over end of shaft causing the difficulty. Shaft removed from cam fairly easily using a 7 ton arbor press. Faced cam gear end of shaft to remove peening & reassembled.
Your configuration looks correct. You could increase the diameter of the reduced portion of the shaft but it was made that way(on both ends) so that woodruff key does not protrude into the bearing bore. If it does protrude too far & shaft is knocked thru from that side you will damage the bearing bore like on Stover K's for one.
Shaft ends are recessed from face of hubs and secured in place with cap screw & washer.
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Last edited by Doug Kimball; 05-07-2017 at 08:25:58 PM.
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Old 05-07-2017, 08:30:20 PM
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Default Re: 4HP Sandwich Help Needed

I have a cast spoked gear with a 1" face, correct bore and oversize hub I'll turn down to correct dimensions. The right side of the gear is already done.

Boring out the shaft sounds like a fine idea.

I'm planning to increase the diameter of the shaft that runs in the bearing to provide a better shoulder for the gear, not the reduced ends for the cam and gear.

Thanks for the quick responses and guidance, and pictures. Exactly what I needed to proceed.

Will post pics of progress.
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Old 06-08-2019, 07:03:02 PM
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Default Re: 4HP Sandwich Help Needed

Parts made, ready for reassembly. How is the timing mark on the gear synced with the crankshaft gear?
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Old 06-09-2019, 01:13:28 PM
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Default Re: 4HP Sandwich Help Needed

Found instructions in one of Steve Barr's posts, just need to pick one of the marks on this engine. 1st pic crank @ outer position, 2nd @ inner position.
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