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Bobcat  > Skid Steers  > 642b point gap  
 
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 Author Thread: 642b point gap
earmuffs is not online. Last active: 2/28/2012 6:35:31 PM earmuffs
Joined: 03 Nov 2008
Total Posts: 73
 
642b point gap
Posted: 02/15/2010 06:26 PM
anyone know what the gap setting is with the 642b mitsubishi engine?
OldMachinist is not online. Last active: 9/30/2014 7:23:33 AM OldMachinist
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Re: 642b point gap
Posted: 02/16/2010 04:32 AM
If it's the same as the 742 with a Mitsubishi 4G32 it's .018”-.021” and the timing is 5 deg BTDC at 600-650 RPM. At 2800 RPM with vacuum line off it should be 10 degreees advanced.

Bobcat 453F ,Loegering steel tracks, Grouser steel tracks, 48" Dirt bucket, 48" toothed bucket, grapple bucket, 72" hydraulic vee snow plow and utility forks, 1954 Ford 860, 1952 Allis Chalmers CA, 1947 Case SC, Nashville IL USA
earmuffs is not online. Last active: 2/28/2012 6:35:31 PM earmuffs
Joined: 03 Nov 2008
Total Posts: 73
 
Re: 642b point gap
Posted: 02/16/2010 01:10 PM
i put new points in.but there is pressure on the vacuum advance line not vacuum. it runs like the choke is on,sooting up the plugs.
OldMachinist is not online. Last active: 9/30/2014 7:23:33 AM OldMachinist
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Re: 642b point gap
Posted: 02/16/2010 01:43 PM

Is the vacuum line hooked up right at the base of the carburetor? Does it get vacuum when you rev it up?

 


Bobcat 453F ,Loegering steel tracks, Grouser steel tracks, 48" Dirt bucket, 48" toothed bucket, grapple bucket, 72" hydraulic vee snow plow and utility forks, 1954 Ford 860, 1952 Allis Chalmers CA, 1947 Case SC, Nashville IL USA
earmuffs is not online. Last active: 2/28/2012 6:35:31 PM earmuffs
Joined: 03 Nov 2008
Total Posts: 73
 
Re: 642b point gap
Posted: 02/16/2010 08:35 PM
timing belt was off 1 tooth. after i changed it now it wont start. so i put it back. doesnt rev up it just runs worse. no vacuum anywhere. it was running good last week. i will check compression next.
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