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Old 07-29-2008, 11:07 PM   #1
DoodieHead
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Join Date: Sep 2001
Chapter/Region: RMIC
Location: Billings, MT
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2001 GC8 12.08@114
GT35R / Self Tuned 15lbs

Default Blown Valve Guide Seals? *Pictures*

I may have blown some valve guide seals and need someone elses opinion. I was also wondering how one would blow valve guides and how hard would it be to replace them. I have a dyno appointment in a week and need to get the car back on the road.

Thanks gang

http://usera.imagecave.com/doodiehead/Motor/
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Old 07-29-2008, 11:37 PM   #2
White 2.5rs
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99RS TWE&SCAT EJ257
Hydra+HMist+PPG+35R=DEATH

Default

you have to pull the springs off, which if the head is on the car, requires pressuring the cylinder. The seals are easy to replace, but like 5 dollars a piece iirc. I did them when i upgraded valve springs... are you sure its not a bad hg?
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Old 07-29-2008, 11:53 PM   #3
DoodieHead
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GT35R / Self Tuned 15lbs

Default

Pretty sure it is the seals. I actually have had this problem before and have no idea why I keep having it. Head Gasket looked good. The motor is out of the car and heads are separated. You say it is easy to install new seals? If you get bored you should shoot me some instructions.

Thanks.
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Old 07-30-2008, 12:11 AM   #4
White 2.5rs
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99RS TWE&SCAT EJ257
Hydra+HMist+PPG+35R=DEATH

Default

The way I did it was-

Remove keepers
Remove retainer
Remove spring
Pull off old seal w/ your fingers or a pair of needle nose pliers
Put some assy lube into the new seals so they dont get damaged
Slide them over the old valve and press them onto the valve guide, you should feel them sort of pop on

reinstall the stuff
youre done
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Old 08-01-2008, 10:28 PM   #5
MY99 2.5GT
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05 Legacy GT 06 Armada

Default

Just curious how you realized the blown guide seals? Was it just a matter of oil burning or were there noticeable performance decreases?
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Old 08-01-2008, 11:40 PM   #6
DoodieHead
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GT35R / Self Tuned 15lbs

Default Seals are good, Spring and seats are bad!!

Here is a list of what I found on the heads. Needless to say my Dyno appointment is going to be cancelled. :*(

Passenger Side from Rear to Front:

#1 Ex - Has excess goo under Seat
#2 Ex - Cracked Seat
#3 Ex - 1 Bad Shim
#4 Ex - 'OK'

#1 In - 'OK'
#2 In - 'OK'
#3 In - 'OK'
#4 In - 'OK'

Drivers Side from Rear to Front:

#1 Ex - 'OK'
#2 Ex - 'OK'
#3 Ex - Broken Seat
#4 Ex - 'OK'

#1 In - Broken Seat
#2 In - Broken Seat
#3 In - Broken Spring / Seal Missing Spring / Missing Seat
#4 In - Broken Seat

I guess that the seals were fine, it was everything else that was FUBAR. My #3 Intake valve was actually moving without rotating the cam, as the spring was split in half. The bad news is that where the seat sits flat against the head in that sunken hole, that part got really F'd since the spring broke. I am guessing that when the spring broke, it was wabbling around quite a bit destroying the seat, which in turn destroyed the housing for the seat. Bummer of a night. Thanks for the help guys, hopefully have it back on the road here soon.

M|key
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Old 08-02-2008, 12:43 AM   #7
DoodieHead
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GT35R / Self Tuned 15lbs

Default

New pictures added showing the damage.

http://usera.imagecave.com/doodiehead/Motor/
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Old 08-02-2008, 12:45 AM   #8
White 2.5rs
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Hydra+HMist+PPG+35R=DEATH

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how in the hell did that much damage occur?
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Old 08-02-2008, 12:56 AM   #9
DoodieHead
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GT35R / Self Tuned 15lbs

Default

You know, that is what I was wondering. These heads are suppose to tolerate just about anything and I was only boosting 1BAR since they have been in. I guess it is a good thing I did not go any higher. Never heard of snapping a spring before. Oh well, Tom @ Techworks is very nice and I am sure he will take care of this.
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Old 08-02-2008, 10:00 AM   #10
Joncas
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Are those marks in the top of the pistons from the valves being misaligned where the valves pockets are cut? Maybe it's just the picture but it looks like 4 marks.
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Old 08-02-2008, 01:13 PM   #11
Richie03
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Default

Quote:
Originally Posted by Joncas View Post
Are those marks in the top of the pistons from the valves being misaligned where the valves pockets are cut? Maybe it's just the picture but it looks like 4 marks.
I see them too. I'm guessing that a bad valve seat would cause piston to valve contact. Great pictures!
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Old 08-02-2008, 03:40 PM   #12
DoodieHead
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Join Date: Sep 2001
Chapter/Region: RMIC
Location: Billings, MT
Vehicle:
2001 GC8 12.08@114
GT35R / Self Tuned 15lbs

Default

You know, I did not even see the marks on the piston from the valves. That is a bummer. I did overlook the other 3 pistons and there are no marks. I believe that is the cylinder I lost the spring on. I will have to check my log.
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Old 08-02-2008, 03:45 PM   #13
DoodieHead
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Join Date: Sep 2001
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Location: Billings, MT
Vehicle:
2001 GC8 12.08@114
GT35R / Self Tuned 15lbs

Default

Well after looking over my notes, it was #2 that had the marks and the broken spring.

Cylinder #2

#3 Exhaust - Broken Seat
#4 Exhaust - 'OK'
#3 Intake - Broken Spring / Seal Missing Spring / Missing Seat
#4 Intake - Broken Seat
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