New misfire - sticky valves?

Would have to go with Kiwi. The guide appears to be moving.

Pull the intake manifold. Should be an easy fix.

Could be collets out of place or valve broken near the collet end.

Intake off inspection required.

Good use of the video capture.

Mart.
 
Just took off the intake and here's what I found. Guess I was lucky that it landed and stayed where I found it. The rest of the valve assembly looks good. Anyone know where to get a new C-clip?
 

Attachments

  • valve1.jpg
    valve1.jpg
    68.1 KB · Views: 106
  • valve2.jpg
    valve2.jpg
    68.6 KB · Views: 99
JMFL36 said:
Just took off the intake and here's what I found. Guess I was lucky that it landed and stayed where I found it. The rest of the valve assembly looks good. Anyone know where to get a new C-clip?
Click to expand...

Let me check tomorrow. If ive got part of a set ill send you some .
 
It's nice to see a conclusion to a problem. Thanks for following through the whole project! Nice work!


You might take up any offers on a used/good clip. At least you'll know what the steel is made from.


I'd probably wonder why the clip failed. They are hard to get out on most engines in normal settings. Guides are stationary. Repeated valve sticking putting force on guide movement (there is only force from the spring, nothing from a sticky valve would force a 40/60lbs spring down to release the clip to let a 1/8" gap horseshoe to pop out), spring pressure? not installed correct previously, or a bent valve. Maybe look at how it happened also in conjugation to replacing the culprit.


.
 
Last edited:
It appears that the spring retainer has also come loose. Under the circumstances, the entire valve assembly is suspect. You could try to reassemble the this particular valve assembly, checking each of the various components for flaws, but if it was mine, I’d simply replace that assembly so I didn’t have to worry if some other piece of it would continue to act up. Further replacing of manifold and head gaskets plus all the retorquing would be a real drag to have to go through.
 
Mac VP said:
It appears that the spring retainer has also come loose. Under the circumstances, the entire valve assembly is suspect. You could try to reassemble the this particular valve assembly, checking each of the various components for flaws, but if it was mine, I’d simply replace that assembly so I didn’t have to worry if some other piece of it would continue to act up. Further replacing of manifold and head gaskets plus all the retorquing would be a real drag to have to go through.
Click to expand...


I agree. The guide may have a defect that let the retainer come loose. At first I thought it just did not get fully installed but then I wondered if part of the guide did not break.
 
Mac VP, the bottom spring retainer is still in place and looks good.

Frank Miller, I was able to inspect the full guide circumference by turning the guide with a needle nose pliers. The retainer groove in the guide looks good with no damage all the way around.

I suspect (hope) that the retainer clip was not completely seated when installed, and worked its way out over time. The motor was rebuilt by a previous owner and has seen little mileage since the rebuild, under 1000 miles.

So my plan is to just replace the clip and not pop the heads. After a couple hundred miles I'll pull the intake again and do another close inspection of that valve assembly.

Ggmac, it would be great if you have a couple spare clips you could send me. Much appreciated.
 
Make sure the recess in the block, the retainer clip fits into, is clean and clear of obstruction so the retainer fits inside the recess.
 
JMFL36 said:
Mac VP, the bottom spring retainer is still in place and looks good.

Frank Miller, I was able to inspect the full guide circumference by turning the guide with a needle nose pliers. The retainer groove in the guide looks good with no damage all the way around.

I suspect (hope) that the retainer clip was not completely seated when installed, and worked its way out over time. The motor was rebuilt by a previous owner and has seen little mileage since the rebuild, under 1000 miles.

So my plan is to just replace the clip and not pop the heads. After a couple hundred miles I'll pull the intake again and do another close inspection of that valve assembly.

Ggmac, it would be great if you have a couple spare clips you could send me. Much appreciated.
Click to expand...
Ive found 5 that are homeless . Pm your address and ill get them to you . Itll be a couple of days till i get to the post office .
Gary
 
JMFL36 said:
Mac VP, the bottom spring retainer is still in place and looks good.

Frank Miller, I was able to inspect the full guide circumference by turning the guide with a needle nose pliers. The retainer groove in the guide looks good with no damage all the way around.

I suspect (hope) that the retainer clip was not completely seated when installed, and worked its way out over time. The motor was rebuilt by a previous owner and has seen little mileage since the rebuild, under 1000 miles.

So my plan is to just replace the clip and not pop the heads. After a couple hundred miles I'll pull the intake again and do another close inspection of that valve assembly.



Ggmac, it would be great if you have a couple spare clips you could send me. Much appreciated.
Click to expand...

Parts sent . Pm with details . Good luck
 
Update. Thanks to Ggmac, got a few horseshoe clips in the mail yesterday. Borrowed a pickle fork (valve spring depressor) from a friend. Today I put the clip in. It was a snap (pun intended). Got everything back together and she fired up on first crank. Runs quieter than before the clip came out, so it must have been misaligned for awhile before popping out. Problem solved (fingers crossed). Thanks to everyone for all the tips and advice, and a special thanks to Ggmac for the spare clips!
 
Mac VP said:
Further replacing of manifold and head gaskets plus all the re-torquing would be a real drag to have to go through.
Click to expand...


Every once in a while you could pull both. Gaskets are a good thing to have. I agree with you to not figure out an issue because you don't want to buy gaskets, seems weird.
 
You must log in or register to reply here.
Back
Top