09-23-2017, 10:02 AM | #1 |
Senior Member
Join Date: May 2010
Location: Irving, Texas
Posts: 598
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Valve problem
I have an issue with an exhaust valve that just started sticking. This is a new build that has about 30 miles on it. Has been running great. At 1500 rpm, the lifter starts clattering and the engine misses. I can goose it and it quiets down. No noise at idle. Ran a compression check this morning and all cylinders are 120 psi. Temp runs at 150 degrees. I need some suggestions on this one.
Thanks, Ed |
09-23-2017, 11:31 AM | #2 |
Senior Member
Join Date: May 2010
Location: Chester Vt
Posts: 8,842
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Re: Valve problem
Alittle MMO in the gas and use 180 stats. Flathead should run hot.
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09-23-2017, 12:23 PM | #3 |
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Join Date: Dec 2013
Location: Minnesota, Florida Keys
Posts: 10,260
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Re: Valve problem
I agree, 150 is too cold.
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09-23-2017, 01:47 PM | #4 |
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Join Date: Jul 2014
Location: Iowa
Posts: 1,634
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Re: Valve problem
Usual cause for a "sticky" valve is a weak or broken valve spring and/or a valve guide which swells enough when hot to grip the stem. A valve spring retainer that is not properly seated may also be a cause. In our rebuilds we use solid guides and straight stem valves, and never have a problem.
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09-23-2017, 02:14 PM | #5 |
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Join Date: May 2010
Location: Irving, Texas
Posts: 598
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Re: Valve problem
"In our rebuilds we use solid guides and straight stem valves"
That's what I use in my rebuilds as well. Never a problem before this one. May have to pull the intake to see what is going on. Put the MMO in the gas and it's seems to be helping. Thanks Ron. Ed |
09-23-2017, 02:49 PM | #6 |
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Join Date: Jun 2010
Location: San Antonio, Texas
Posts: 16,371
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Re: Valve problem
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For flatheads the fix was already mentioned. The Marvel Mystery Oil is a life saver on the old flatheads. Running at proper coolant temp is a very good idea as well so I can't add anything there. |
09-28-2017, 04:00 AM | #7 | |
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Join Date: Feb 2017
Location: Maine
Posts: 109
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Re: Valve problem
Quote:
I have heard or read recently on the "magic" of bronze lined valve guides for a flathead. I don't recall seeing them sold anywhere, but if I remember correctly there was a company said they could do that to a set of stock solid guides. Thoughts? "Hard tellin' not knowin!" |
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09-28-2017, 04:35 AM | #8 |
Senior Member
Join Date: Dec 2013
Location: Minnesota, Florida Keys
Posts: 10,260
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Re: Valve problem
Gary "GOSFAST" on this board has a company that does them. I have never used his guides, but have gotten a few other things from him and he really knows his stuff.
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09-28-2017, 05:00 AM | #9 |
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Join Date: Apr 2015
Location: Sweden
Posts: 3,045
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Re: Valve problem
Any machineshop can stick a bronze liner in a guide...the size is the same as for a SBC so not uncommon.
I ream mine in the lathe...install....trim...and hone to size in the Sunnen. Honing them is not needed if you arent to picky. |
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