Subaru Legacy Forums

Subaru Legacy Forums (
-   Turbo Powertrains (2.0GT, 2.5GT, 2.5XT) (
-   -   #2 cylinder burnt valve - what else to do while engine is out (

LEGA-C-YA 01-01-2013 03:56 PM

#2 cylinder burnt valve - what else to do while engine is out
I have the dreaded burnt exhaust valve issue on my 2005 Legacy GT with 126K miles on it. I have been running Coob stage 2 since about 25K miles. I have removed the engine and the head and found part of one exhaust valve gone on the #2 cylinder. I want to keep the car for at least another 100K miles so I am wondering how far to take the repair and what other work I should do while the engine is out. I am going to tkae the head to a machine shop tomorrrow but I have never had head work done before

-should I replace both exhaust valves for #2 and also the exhaust valves for #4 cylinder?

-Do the valve guides and/or the valve seals need to be replaced?

-should I touch the intake valves or leave them alone?

-should I send the injectors (stock) out to be checked?
(I only recently got a P0302 code and long after the rough idle problems started, teh spark plug looks the same as the other 3)

-If a leak down test is Ok on the other head should I leave it alone? I would prefer not to touch it

-What other work should I do while the engine is out?
( I am planning a new clutch, and I did the timing belt, water pump, idler pulleys at 105K miles)

Thanks for all help and advise on this

JermTheElf 01-01-2013 04:03 PM

Any oil consumption?

LEGA-C-YA 01-01-2013 04:21 PM


Originally Posted by JermTheElf (Post 4226732)
Any oil consumption?

Yes - I woudl guess a quart every 1200-1500 miles. No sign of any smoke out the exhaust. i had just changed the valve cover gasket on the passenger side and thought some of the oil was leaking out there

LEGA-C-YA 01-01-2013 04:26 PM

1 Attachment(s)
photo of the valves

devobuzz 01-01-2013 04:33 PM

Were you running the 91 or 93 octane tune? And which version of the Access Port?

wurkenman 01-01-2013 04:56 PM

Looks to me like that thing was running lean for some time. Bad thing about a generic off the shelf tune. I would do a complete valve job since it is already out. If it were me, I would also replace the bearings and at least re-ring it. Of course the timing belt and idlers/ tensioner and a water pump.

LEGA-C-YA 01-01-2013 05:15 PM


Originally Posted by devobuzz (Post 4226764)
Were you running the 91 or 93 octane tune? And which version of the Access Port?

The 93 octane tune and the original AccessPort. I have always run 93 octane gas in the car

Max Capacity 01-01-2013 05:44 PM

The machine shop will tell you what you need when they inspect the heads. Notice I said heads and not head.

They should also take the block apart and tell you what you need there too.

Search in the 4th Gen forum for my thread, "got some stuff for engine R&R" It has lot's of good pictures and info.


mightyS 01-02-2013 12:27 PM

Sorry this happened to your engine.

panicrev 01-02-2013 02:01 PM

I responded to your other post. i found someplace locally selling intake valves for $7 each and exhaust for $9 each. they are only slightly (2 grams) heavier than the expensive sodium filled stock exhaust valves. i also changed all of the springs. i got a complete gasket set and changed all of the seals including valve seals. had a machine shop do the work and set up the valve lash. .008 +/- .002 intake, .014 +/- .002 exhaust. i had my throwout bearing explode at the same time so i got the tsk3 kit an clutch kit. i also changed my timing belt, tensioners, and waterpump less than a year ago.

LEGA-C-YA 01-03-2013 05:35 AM

great prices on the valves. Do you remember where you bought them? I brought the head to a machine shop yesterday and am waiting for the tear down. The shop said they would set all the clearances so I am bringing them the cams and the buckets.

I replied to your other psot before this one but I was wondering if you did both your heads or only 1 side? also - did you send your injectors out to be checked and cleaned?

thanks for your replies

Max Capacity 01-03-2013 07:24 AM

You should have both heads rebuilt.

I didn't do anything with my injectors during my rebuild.

Do you have the new larger orange o-rings for the intake manifold to TVG's. Thay should be replaced and you should tighten all the fuel lines under the intake.

SeeeeeYa 01-03-2013 08:00 AM

Here is a thread with information you may find applies to your situation... especially the burned valves. Pay particular attention to Maxwell Power's posts:

Start with this post: and follow the subsequent posts paying particular attention to his mention of aging MAF sensors. I, for one, never considered the MAF Sensor as a maintenance item, but I do now.

While the entire thread contains more value than most, now that you have the engine apart there is a lot more in the thread you may find applicable besides the MAF Sensor info.

panicrev 01-03-2013 08:10 PM

i forget where i bought them. i look for my receipts tomorrow and get back to you about where i got the valves. i responded to the other thread about your other questions

wurkenman 01-03-2013 08:30 PM

I have a complete set of OEM valves and springs with 45K on them. They Came out of my 05. You are going to have the valves touched up anyway, so just use these and have some fresher springs at the same time. You can have everything for 40 shipped.

All times are GMT -6. The time now is 01:23 AM.

vBulletin Optimisation provided by vB Optimise v2.6.3 (Lite) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.