Stuart 7A Eccentric sheave throw

[Stephen Doyle 2Participant @stephendoyle2]

Hello,

I have been given a Stuart 7A vertical engine to complete. I am trying to establish the throw on the eccentric sheave it is missing off the engine and need to replace.

Regards,

Steve

[Stephen Doyle 2Participant @stephendoyle2]

[mechman48Participant @mechman48]

According to my kit drawings the throw is based on 3/32" offset centres, will scan pic of eccentric dwg & post later

George.

[mechman48Participant @mechman48]

Steve

Eccentric dim's…

George.

[Stephen Doyle 2Participant @stephendoyle2]

Hello George,

Thanks very much for the info I appreciate the drawing. I will now attempt to complete and get the engine operational. Thanks once again for your input.

Regards,

Steve.

[Stephen Doyle 2Participant @stephendoyle2]

Hello George,

I have just checked the dimensions on the Stuart 7A I have, there is a drawing but the dimensions are different to the ones on your drawing. This an old 7A I think from the 60,s I have added a picture of the eccentric sheave there appears to be no off set dimension. I am having to make a new eccentric and trying to .establish the throw. Excuse me if I am missing something simple here.

Regards,

Steve

[CirclipParticipant @circlip]

Should be able to calc. throw from valve block and port spacing.

Regards Ian.

[mechman48Participant @mechman48]

Steve

We both have dimensions missing from our respective dwgs; my kit was bought approx 18 more ago so I take it as the latest input of dim's but looking at your dwg it seems that I have missing dim's too so we have both helped ea. other out. If you are able why not send me a pdf set of dwgs from your kit & I can reciprocate then we'll have all the info we need ? my e mail address is in my profile, forward me yours via pm

George.

[Stephen Doyle 2Participant @stephendoyle2]

Hello George,

My email address is [email protected] drop me an email and I will send some pics.

Regards,

Steve

[mechman48Participant @mechman48]

Steve

Sent you e-mail with PDF's

George

[mechman48Participant @mechman48]

Steve

A couple of links to others who have built Stuart 7A 's, drop them a line, they will more than likely give you the exact sizes…

**LINK**

**LINK**

George.

[JasonBModerator @jasonb]

No need to ask Michael you can see the dimension in his first photo – 9/64th.

George is that the right drawing you posted earlier as it only has a 3" flywheel, the 7A should have a 3.5" flywheel which would also explain the larger 9/64 throw and longer eccentric rod on others models. Looks like your drawing is for a 10A

 

Edited By JasonB on 04/02/2016 20:23:24

[mechman48Participant @mechman48]

Mea culpa… My drawing is for a 10A, seems like I went word blind for a while there, after checking my kit box it had 10 A on it although I was convinced it was a 7A… have already posted Steven on the error… considering I'm much closer to 70 than 60 an error or two is bound to arise, so I reckon I'm not doing too bad on the whole.

George.

[Stephen Doyle 2Participant @stephendoyle2]

Thank you for all the assistance especially to George I have sent you a reply email. I now see the throw is 9/64th I was not sure what that dimension on the drawing was. I normally would have expected the throw to be shown from the centre line but there you go that's just me.

[mechman48Participant @mechman48]

Rec'd your dwgs for 7A, appreciated, Like you I would expect the offset to be relative to the centre line, drawn similar to the 10A dwg.

George.

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