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valve clearance question


 
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Robert J Hampton
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Joined: 22 Mar 2010
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PostPosted: Fri Dec 28, 2012 6:17 pm    Post subject: valve clearance question Reply to specific post Reply with quote

I have just replaced the head gasket on my AD3-152. While I had it down I readjusted the valves .012 cold but I think I may have got them a little snug. What would the symptoms be if the valve clearance was not enough? The engine starts great, my only concern is what sounds like a slight sucking sound coming from the exhaust. Would it be wise to readjust with a little more clearance?
 
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Jerry/MT
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Joined: 22 Jul 2003
Posts: 10090
Location: Western Montana

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PostPosted: Fri Dec 28, 2012 10:02 pm    Post subject: Re: valve clearance question Reply to specific post Reply with quote

Your intake valve lift would be a little bigger and your power would come up bit due to more airflow. Your exhaust valves have less seat contact time and run hotter.
 
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Mike in Mn.
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PostPosted: Sat Dec 29, 2012 8:52 am    Post subject: Re: valve clearance question Reply to specific post Reply with quote

I'm not an expert on that engine but 12 seems a little tight to me. I would re-torque the head gasket and re-adjust the tappet clearance according to the book. Sometimes the exhausts require more clearance that the intakes. Get it hot, re-torque the head and re adjust the tappets while hot.
 
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Robert J Hampton
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PostPosted: Sun Dec 30, 2012 2:38 am    Post subject: Re: valve clearance question Reply to specific post Reply with quote

readjusted valves and runs right now. thank for your replies.
 
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DavidP, South Wales
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PostPosted: Mon Dec 31, 2012 5:40 am    Post subject: Re: valve clearance question Reply to specific post Reply with quote

Hi Robert, bit late coming in on this one but it is essential that the engine is at number 1 TDC for both phases of tappet adjustment. This is confirmed by the TDC line being visible in the engine backplate inspection hole.
DavidP, South Wales
 
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Phil Tibbetts
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Location: Old Town, Maine

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PostPosted: Mon Dec 31, 2012 4:50 pm    Post subject: Re: valve clearance question Reply to specific post Reply with quote

I've always felt it was better to have them a little loose than too tight. Never seen a burnt valve from them being too loose. I'm not talking a lot but if your feeler gauge is slightly loose at .012 and tight at .014 I would feel good about that.
 
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