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05-25-2021, 01:12 PM | #1 |
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Intake Valve not seating
I am getting good compression on all cylinders but #8(30lbs). I pulled the head and intake and can see that the intake valve is not seating. I put a light in the intake hole and can see light around the edges of the valve in the closed position. Can anyone tell me how I should proceed with fixing this issue?
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Brad Williamson |
05-25-2021, 01:18 PM | #2 |
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Re: Intake Valve not seating
You will have to pull the retainer and remove the valve it may be bent, if not clean and lube the guide/ valve.
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05-25-2021, 01:23 PM | #3 |
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Re: Intake Valve not seating
Do you have any clearance between the valve stem and lifter??
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05-25-2021, 01:41 PM | #4 |
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Re: Intake Valve not seating
I have removed the valve and cleaned it. I haven't put a feeler on it yet. I'll try to do that this afternoon.
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Brad Williamson |
05-25-2021, 02:07 PM | #5 |
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Re: Intake Valve not seating
I think maybe the valve is bent.
Sent from my iPhone using Tapatalk
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Brad Williamson |
05-25-2021, 02:58 PM | #6 |
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Re: Intake Valve not seating
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05-25-2021, 03:00 PM | #7 |
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Re: Intake Valve not seating
I second that. If you zoom in, looks like a crack on the lifter.
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05-25-2021, 03:27 PM | #8 |
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Re: Intake Valve not seating
It also looks like the valve guide halves are not even. Should be able to find a used valve,guide and lifter to replace what's there. Lap the valve and grind the stem to set clearance. If clearance is too much get a longer valve. Keep it simple. Mark
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05-25-2021, 03:39 PM | #9 |
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Re: Intake Valve not seating
The valve halves are ok. They are uneven in the picture because the clip isn't in holding them together. Just using the guide here to line up the valve stem.
I'll take another look at the lifter, but I have turned the engine over a few times and didn't notice any problems with it all together other than the valve not seating. Would a broke lifter keep the valve from seating properly? Should the valve head be angled slightly? This one is, which is why I thought it may be bent. Thanks!
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Brad Williamson |
05-25-2021, 03:55 PM | #10 |
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Re: Intake Valve not seating
If it is sitting at a angle, its bent.
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05-25-2021, 04:11 PM | #11 |
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Re: Intake Valve not seating
The lifter is ok. The line you see is from the casting I assume.
I'm going to pull a different valve and check it in the same hole and see if it fits any better.
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Brad Williamson |
05-25-2021, 05:33 PM | #12 |
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Re: Intake Valve not seating
Swapped the valve, and it seated right up.
Where should I order a new valve from? Mac Vanpelt?
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Brad Williamson |
05-25-2021, 06:04 PM | #13 |
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Re: Intake Valve not seating
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05-25-2021, 06:05 PM | #14 |
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Re: Intake Valve not seating
An excellent selection.
'Barn'ers decided to create a couple of threads on the topic. See below. https://www.fordbarn.com/forum/showthread.php?t=269580 https://www.fordbarn.com/forum/showt...1339&showall=1
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-Jeff H Have you thought about supporting the Early Ford V-8 Foundation Museum? Last edited by VeryTangled; 05-25-2021 at 06:19 PM. |
05-25-2021, 07:31 PM | #15 |
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Re: Intake Valve not seating
You may think of replacing the guide also. remove the lifter and look closely for a crack in the top angled side.
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05-25-2021, 09:19 PM | #16 |
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Re: Intake Valve not seating
valves dont just bend find the cause or you will go through all this drama again Next time it could be catastrophic
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05-25-2021, 10:04 PM | #17 |
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Re: Intake Valve not seating
I don’t know the history of this engine. I believe it was a rebuild but I’m not sure who did it or the level of quality of their work.
What should I look for? What would cause a bent valve? Sent from my iPhone using Tapatalk
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Brad Williamson |
05-26-2021, 02:34 AM | #18 |
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Re: Intake Valve not seating
i'ld re check that lifter it shore looks to be split to me also check the head above the valve for any signs of impact
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05-26-2021, 07:07 AM | #19 |
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Re: Intake Valve not seating
I don't believe the Ford style lifters are cast. Judging from the pictures, that lifter certainly looks cracked to me.
Last edited by Tim Ayers; 05-26-2021 at 07:13 AM. |
05-26-2021, 07:29 AM | #20 |
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Re: Intake Valve not seating
While it open I would replace the complete lifter, valve, guide, clip, etc.. Lap it in, set it to specs and reassemble. You have apparently identified the issue and a little overkill on the fix may save you time and money down the road.
All you who have done a repair "half way" and had to go in and do it again raise your hand... If the second repair was three times as expensive and more time consuming than the first raise your hand. Just saying, "enjoy the adventure"... Chap |
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