Intake Valve not seating

bmwillia

bmwillia

Senior Member
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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You will have to pull the retainer and remove the valve it may be bent, if not clean and lube the guide/ valve.
 
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.
 
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
 
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!
 
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.
 
You may think of replacing the guide also. remove the lifter and look closely for a crack in the top angled side.
 
valves dont just bend find the cause or you will go through all this drama again Next time it could be catastrophic
 
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?


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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
 
bmwillia said:
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.
Click to expand...

I don't believe the Ford style lifters are cast. Judging from the pictures, that lifter certainly looks cracked to me.
 
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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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