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  #1  
Old 07-03-2006, 10:21 PM
shopteacher shopteacher is offline
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Location: Lawton, Michigan
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Compression 175psi, is this too high on a 15.5 vanguard?

Hey guys, hope all is well.
I had only 70 psi on a briggs vanguard ohv. I replaced the head gasket and now its a whopping 175. I adjusted the valves to .005 and .007 respectfully. But WOW, I didn't think I would get 175 psi.
Any thoughts?
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  #2  
Old 07-04-2006, 12:59 PM
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lawnmaniac883 lawnmaniac883 is offline
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175 is a little too high I believe. Sounds to me like you need a thicker head gasket to bring that down to around 160.
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  #3  
Old 07-04-2006, 05:24 PM
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Restrorob Restrorob is offline
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How does it run now with the new gasket ? And sorry maniac, There is only one gasket for this engine.
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  #4  
Old 07-04-2006, 05:56 PM
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lawnmaniac883 lawnmaniac883 is offline
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Originally Posted by Restrorob
How does it run now with the new gasket ? And sorry maniac, There is only one gasket for this engine.

Well, thats gonna suck if it doesnt run right vanguard...
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  #5  
Old 07-05-2006, 11:16 PM
shopteacher shopteacher is offline
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I found the problem. I had a briggs mechanic tell me that 180 lbs was what a brand new engine would have. Long story short - I took off the valve cover and discovered the rocker arm had come off.
I don't know how, but I adjusted the valves again, and it ran great
This time the compression was 85
Good lesson.
Thanks for your answers.
Keep on wrenchin'
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  #6  
Old 07-06-2006, 12:36 PM
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lawnmaniac883 lawnmaniac883 is offline
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Quote:
Originally Posted by shopteacher
I found the problem. I had a briggs mechanic tell me that 180 lbs was what a brand new engine would have. Long story short - I took off the valve cover and discovered the rocker arm had come off.
I don't know how, but I adjusted the valves again, and it ran great
This time the compression was 85
Good lesson.
Thanks for your answers.
Keep on wrenchin'

If the exhaust rocker is the one that came off then the engine would act like an air compressor. My guess is that you turned it over twice allowing it to build excess pressure. Now 85? Too low... engine wouldnt be running if it only had 85 PSI.
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