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Old 05-26-2013, 07:41 PM   #1
ImBillT
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Dropped valve seat. Chances of bending a connecting rod?

So my wife's focus just wouldn't start when she tried to start it last. Did a comp check and found out it dropped a valve seat. The engine hasn't been run since. I started it twice and it sputterd, coughed and died. Most of the ones i read about get driven a little before they are diagnosed. Since the thing has probably been cranked for less than 60 seconds total since it happened, is there any chance the rod is still good?


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Old 05-26-2013, 08:09 PM   #2
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I highly doubt a valve could do any damage to a rod. There might be some carnage to the top of the piston, but most likely still useable.
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Old 05-30-2013, 08:47 PM   #3
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I spoke with some longtime friends and Ford mechanics. Their procedure is to replace the rod and piston in the damaged valves cylinder. Three mechanics, all pros, same opinion.

If the piston has been whacked, even a little, chances are the piston and rod are toast.

I am going through the process right now as my Focus lost #4 cylinder last week. Read the other thread about this.

Take care!
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Old 05-31-2013, 02:42 PM   #4
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Thanks man. It seems rare, but mine dropped a seat on #1. Ordered one rod. Now that the head is off I wonder if my wife cranked on it more than I realized. Cylinders #3 and #4 have some chunks in them as well.
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Old 05-31-2013, 10:07 PM   #5
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One thing that was really emphasized to me was to clean out all of the passages in the intake, the vacuum lines, the lines to the EGR, etc. Also clean the bottom of the intake below the throttle body. They tell me that if there is junk in those places, metal bits, it gets sucked into the cylinders again and *POOF* another head bites the dust. Clean it all, be anal about it to save yourself future grief.
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Old 06-02-2013, 06:29 AM   #6
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Depends on the piston/head damage. More means rod bent. If pieces of ring land came loose then by all means change it.

'I highly doubt a valve could do any damage to a rod.'

And at 8600 posts, too. Lost, oh so lost.......................

Last edited by amc49; 06-03-2013 at 10:18 PM.
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Old 08-15-2013, 02:58 PM   #7
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ANY nicks (unless very very VERY minor) require a piston AND rod change, period, why chance it?
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Old 08-18-2013, 11:06 PM   #8
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Yes, they need to be pretty small nicks...............
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Old 08-20-2013, 04:50 PM   #9
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Hello, I recently bought a 2000 SPI (Craigslist for $800), it had dropped a #1 seat, I got it from a shop and the head was off and missing. I pulled the engine and rebuilt it on a stand, with new (standard) pistons and rings, new (standard) bearings (at 115K still looked new), lightly honed the cylinders, and rebuilt / corrected head - in the process I am glad I did the pistons, because #1 was broken in two about the pin, and also the rod was bent at the pin so I had to replace that too (rebuilt, $28). The engine rebuild went very well, I am very impressed with the block. I only have about $600 in it, it is back in the car already and should be ready to start in a few days - my first Focus, I have never even been in one before! So, don't gamble when doing an SPI with a dropped seat - it is not that hard to drop the oil pan and undo a rod and pull a piston to inspect and make sure when putting on a rebuilt head or you may have to pull the head again! Plus new pistons and rings were only $170, well worth it. Bob Scates, Virginia
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Old 08-20-2013, 09:54 PM   #10
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With that kind of a break I'da been looking VERY close at the cylinder wall there, not impossible to crack a wall out too.

And yes, with cast pistons people often look at piston top and then make the judgement the piston/rod are fine, of course they're not. Cast pistons are brittle and can look pretty good on top and be garbage at the ring lands or skirts.

Last edited by amc49; 08-28-2013 at 03:16 AM.
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