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Antique Gas Engine Discussion

Valve Timing on a Jaeger Type S


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  #1  
Old 03-06-2005, 12:58:07 AM
CJ Winslow
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Default Valve Timing on a Jaeger Type S

I have a 2 HP Jaeger Type S that I am putting together. There is a gear on the crank that has a prick punch mark on it which I lined up with the cam gear which has a line punched betwen two teeth on the side of the gear. I can not find any other marks on either of the gears. I am not sure what I am doing wrong, but the exhaust valve deffinitly opens when the piston is about 1/3 of the way through the exhaust stroke and remains open into the intake stroke. The cam that is on this engine runs both the valve and the magneto trip. I am not sure what I am doing wrong but there must be a logical way to time this engine. I am sure that with the wealth of knowledge on this board somebody has been down this path before and can shine some light on the subject.

Thanks for the help - CJ Winslow
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Old 03-06-2005, 02:38:03 AM
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Dick Graybill Dick Graybill is offline
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Default Re: Valve Timing on a Jaeger Type S

Go to http://www.herculesengines.com/hercu...al/page_8.html It showes aphoto of cam gear and crank. You can copy whole manual. Dick in central PA.
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Old 03-06-2005, 02:43:47 AM
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Dick Graybill Dick Graybill is offline
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Default Re: Valve Timing on a Jaeger Type S

I made an error on last post. Try again. http:http://www.herculesengines.com/hercu...al/page_8.html Dick in central Pa.
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Old 03-06-2005, 02:54:23 AM
Andrew Mackey Andrew Mackey is offline
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Exclamation Re: Valve Timing on a Jaeger Type S

You may not have the valve adjusting bolt set properly. Exhaust valve should open about 20 degrees before BDC and should just be closed at top center. Mag trips at top center - retarded, and about 25 before top center in full advance When you re-assemble the engine governor, put engine at bottom dead center, install governor with the flyweights in a vertical position. This is very important, as it will prevent the flyballs from hitting the piston and being broken off.
Andrew
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Old 03-06-2005, 11:36:50 AM
Jim Tremble Jim Tremble is offline
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Default Re: Valve Timing on a Jaeger Type S

Quote:
Originally Posted by CJ Winslow
I have a 2 HP Jaeger Type S that I am putting together. There is a gear on the crank that has a prick punch mark on it which I lined up with the cam gear which has a line punched betwen two teeth on the side of the gear.
CJ

Forget the marks. Line up the arrow on the cam gear with the keyway on the crank. Adjust the rocker adjusting bolt as needed.

Jim
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Old 03-06-2005, 01:16:51 PM
CJ Winslow
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Default Re: Valve Timing on a Jaeger Type S

I ignored the two marks on the cam gear. I used the keyway to line up with the line on the cam gear and by all appearances it looks good. When I get the engine completed I will be sure to get a picture posted. I have been going through it from the ground up for the past six weeks at a pretty steady rate. I am a college student so all work is being done out of the bedroom of my apartment. All of the individual parts have been going back and forth to the machine shop for repairs, fabrication, sand blasting and paint. Spring break is next week and the engine is going home with me and will be up and running soon with the help you guys have offered.

- CJ Winslow
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