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Old 03-08-2014, 07:44 PM   #1
Dmperfection
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Dropped valve seat, head removed--now what?

Pulled off the head today. #4 looks pretty chewed up. Here's a couple pictures. I was idle when it happened and in a panick tried to restart when it died. Wasn't on for more than 20 seconds when it happened. Cylinder wall is prestine. With head off, turned crank and it was smooth with no binding, just what felt like normal tension.

Questions:

Machine shop for new valve seats and service or head exchange?

A few posts say headsonly has been a good source for exchange. Can anyone comment on experience with headsonly or any other source? Do one of these exchange heads solve valve seat problem 100%?

Piston--requires replacement? I was thinking taking a high speed grinder and smooth out a little.

I've read to check oil pan for debris. How does valve seat get into oil pan? Or am I just looking for broken pieces in general such as block?

Thanks for any input.


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Old 03-08-2014, 07:56 PM   #2
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Yes, replace piston. FFS don't take a grinder to it and try tio reuse it.

You also need to check cylinder wall. Chances are it's awfully mangled
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Old 03-08-2014, 08:05 PM   #3
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Quote:
Originally Posted by goingtoscotland View Post
You also need to check cylinder wall. Chances are it's awfully mangled
Cylinder wall looks perfect. In fact, all cylinder walls still show cross hatch markings. I believe that's a good sign, right?
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Old 03-08-2014, 08:12 PM   #4
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That's good. You'll still have to hone them for new rings, though.

While you're in there I would also get some new bearings for the bottom end. This is a perfect opportunity for a pretty fresh motor without too much extra effort or cost.
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Old 03-09-2014, 01:53 AM   #5
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Yeah, that one is "hammered" more than a little bit that could be smoothed out.

You're looking in the bottom for pieces of the piston actually, some haven't been able to tell the piston was cracked/broken 'till they pulled it out.
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Old 03-11-2014, 11:25 PM   #6
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I bought..

http://www.shop.headsonly.com/FORD-F...US-20-SOHC.htm

That one. They were easy to work with and picked up the phone when I called to ask about the core (I broke an exhaust stud in the head, but they didn't care). They didn't charge me a core charge, they just required that I send the core back to them within 30 days. This is pretty easy since I was able to just put it back in the box it came in (which kept my new head pretty safe ) and stick their return label on it - yep, that's right, they paid for the return shipping. :) They have one for $225 without the cam/rockers/and lifters, but for the price it saved me the hassle. You do need to torque the rocker bolts down though, they're lose so that the valves don't stick out of the head.

Overall I was extremely happy about the purchase. It's been on the car for 15k miles now and I haven't had any problems with it.
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Old 03-12-2014, 12:06 AM   #7
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Overall I was extremely happy about the purchase. It's been on the car for 15k miles now and I haven't had any problems with it.
Thanks, I appreciate the response.
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Old 03-12-2014, 12:05 PM   #8
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Your going to want to search that engine top to bottom for debris. I just started a build thread of my Engine. I wasn't so lucky and ended up with a bent rod and a cracked cylinder wall. Chances are there are pieces of piston in your oil pan. You'll also have plenty of debris in the intake manifold, egr tube and probably the cat. Do yourself a favor, pull the engine and atleast re-ring it with a new piston on number 4. There could also be damage to the bearings on #4 from the repeated impact of the piston as well as debris falling to the oil pan.

It would really suck for you if you went through the trouble of fixing it only to miss a piece of debris somewhere and have this happen all over again. There are plenty of stories of people who have had that happen to them.
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Old 03-12-2014, 02:48 PM   #9
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No point in not honing all 4 and getting new rings
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