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Old 06-14-2014, 01:24 AM   #1
montanasuby
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Member#: 204866
Join Date: Mar 2009
Vehicle:
2004 Forester XT

Default High Milage shortblock reuse or no?

My 2004 xt forester ended up with a burned exhaust valve at 195,000 miles. The compression tests were @120 across the board at 3300 ft elevation. The number 2 cylinder with the burned valve had 70% leakdown and low compression. I am torn wether to run with this block or not money is an issue anyone want to shot holes in my plan or been down this road?
Thx
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Old 06-14-2014, 01:33 AM   #2
uglybetty
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If you burnt a valve just make sure that the cylinders aren't scorched as well.

I bought an 05 fxt to build and am reusing the 701 series block at 150k but mine never had any issues. Post some pics if.you can and some of of the more knowledgeable guys will give you a better opinion
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Old 06-14-2014, 10:49 AM   #3
montanasuby
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Snapped a couple photos, there are some tracks visible. Not looking to promising.




side view







Edit to add photos. I have this block for sale but today I decided to pull piston numbers 2 & 4 to inspect the ringlands.

Last edited by montanasuby; 07-05-2014 at 10:26 PM.
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Old 06-14-2014, 11:01 PM   #4
BMXkrUZer
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2002 Stroked WRX
WRB

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Does your fingernail catch in those tracks? If not I'd run it in a heartbeat!
Your compression and leak down numbers were low on the cylinder because of that valve obviously.
Personally I would just replace that one valve and get the rest lapped. Then slap it back together and do another compression test. That the cheapest route too.
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Old 06-18-2014, 02:23 PM   #5
BONFIRE074
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2006 Unicorn
Saabaru 9-2x

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run itttttttt
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Old 06-19-2014, 10:22 AM   #6
Keaton522
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I would use a drill, tubing, and grinding compound, set the new valve, get new headgaskets, and slap it back together!
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Old 06-19-2014, 09:51 PM   #7
sidewayz
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My 04 FXT had the same thing. Burned exhaust valve. I tossed a used one in, lapped all the valves, new seals, ball honed the walls and built it. 10,000 miles later and still strong
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Old 06-22-2014, 06:42 AM   #8
my99maddog
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Scotch bright and wd40 on the pistons and check the block faces with a set square.
Never assume it is flat, measure it with a straight edge and feeler gauge. You should have no more than .002" (.05 mm) out-of-flat in any direction.
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Old 07-05-2014, 03:21 PM   #9
montanasuby
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Quote:
Originally Posted by sidewayz View Post
My 04 FXT had the same thing. Burned exhaust valve. I tossed a used one in, lapped all the valves, new seals, ball honed the walls and built it. 10,000 miles later and still strong
Did you ball hone with the crank in? I am trying to avoid splitting the block?
thanks
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Old 07-05-2014, 03:24 PM   #10
montanasuby
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Quote:
Originally Posted by Keaton522 View Post
I would use a drill, tubing, and grinding compound, set the new valve, get new headgaskets, and slap it back together!
Use that stuff for?

I got the heads machined. At this point I have the #2 & 4 pistons out and have no ringland failure. I was thinking of doing a re-ring or new sti pistons and rings and a hone.

I need to research if I can avoid splitting the block to do the hone or if I should not hone it and just put new pistons in.
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