Dropped valve seats | Ford Escort Owners Association (FEOA)
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Dropped valve seats

Discussion in 'Tech & Repair' started by Shyguy, Sep 3, 2018.

  1. Shyguy

    Shyguy New Member

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    Have a 99 escort that dropped valve seats. Got the head off and looking at the pistons am wondering if getting a replacement head is worthwhile.
    The picture is the worst of them but they all have similar damage albeit to a leader extent. Question is with a replacement head can I expect it to run? Obviously I'll have lower compression than would be expected. Replacing pistons his way more work than I'm willing to do. This isn't a primary vehicle it's just something to drive around if I need to do work on another car.

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  2. Gamer92

    Gamer92 FEOA Donator

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    Best to replace the damaged pistons and put a rebuilt head on there. You can get a kit on eBay with Pistons and rings for $80

    You'll have to home the cylinders but that is fairly easy with a ball hone.
  3. Shyguy

    Shyguy New Member

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    Right, I was hoping to avoid that. Presumably I have to pull the engine out to make that happen.
  4. Gamer92

    Gamer92 FEOA Donator

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    Not necessarily. You can replace pistons with the engine still in the car. They come out from the top. All you have to do is remove cat converter and oil pan
    Last edited: Sep 3, 2018
    copcarguy, millball and rbailin like this.
  5. Shyguy

    Shyguy New Member

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    Right, I did manage to figure that one out, although I imagine it would of been easier if I had an engine hoist.
  6. Shyguy

    Shyguy New Member

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    So how do i remove the wrist pins. I see no sorts of retaining rings. I presume it's not meant to. So far I've tried a wooden dowel and a hammer to try and beat it out, that went nowhere. Does firewrenching it or sticking them in an oven do any good or am I looking to take them to a machine shop? Also if I have to take them to a machine for removal does that mean I'll have to do the same for installation?
  7. denisond3

    denisond3 Moderator Staff Member

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    I would take the pistons to a machine shop. Pressing the wrist pin out (and back into a new piston) involves having a curved support for the piston, and doesnt involve doing any impact trauma to the piston.
    I have fixed up two 1.9L engines that had dropped a valve seat with prior owners who didnt want to bother with the rebuild. In my case I took the engines out of the car, to get each block cleaned, to replace the freeze plugs, cylinders honed, etc. There wasnt enough of a ridge rim in any cylinder to necessitate removing it. The work didnt cost much per block. I also had a cantilever hoist already. Im a hobbyist. This work I did outside on a workbench under a shade tree.
    After taking the pistons out, I found that each block had just two pistons with any damage. (also only two pistons with any pockmarks on the tops). I got a JY engine and took used pistons/rods from that, so never (yet) had to separate pistons from con rods.
    I put rings on the pistons - after cleaning out the ring grooves. I put new crank and rod bearings. They all looked good but it was easy, with the thing on my workbench. New main seals.
    I got a rebuilt head each time , which was my major expense.

    I also flushed out the intake manifold, using gunk and a garden hose sprayer.
    Both cars are still daily drivers for the wife and I. We have put about 70,000 miles on the one I did in 2008, 40k on the one I did in 2009. The $200 I spent on the JY engine has been a bargain, based on all the other parts I got from it over the years.

    If you just put a rebuilt head on it, the damaged pistons will likely fracture from overheating, maybe in less than a thousand miles. All the cylinders were shiny and undamaged, but the pistons were stiff on the wrist pin, and at least one of the compression rings was jammed into the ring groove.
    millball likes this.
  8. zzyzzx

    zzyzzx FEOA Member

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