Pics of my intake valves - TerrainForum.net: GMC Terrain Forum
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post #1 of 11 (permalink) Old 08-30-2018, 11:10 AM Thread Starter
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Pics of my intake valves

2011 Nox with 2.4l
75k
Engine rebuild last year from oil burning and no burning since.

Finally purchased a good boroscope (depstech)
The intake manifold on the 2.4l is a pita to do this. Have to go down from the throttle body, do a 180 turn to get it up through the runners. Ultimately had to use washer water hose to run the boroscope through in order to make the 180 turn.

Surprised these valves were not worse.
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Jeff from Iowa, Purchased 2011 Nox in Nov. 2016, Manufacture date 10-10, 2.4l, AWD
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post #2 of 11 (permalink) Old 08-30-2018, 11:33 AM
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Wow.. . how many miles since the rebuild?
Not too bad, but something in me wants to reach in there and use a wire brush or something to scrub that stuff off of the back of the vales and stems.
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post #3 of 11 (permalink) Old 08-30-2018, 12:00 PM Thread Starter
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Wow.. . how many miles since the rebuild?
Not too bad, but something in me wants to reach in there and use a wire brush or something to scrub that stuff off of the back of the vales and stems.
Maybe 8k - 10k miles since rebuild.
They never touched the valves when they do the rebuild so that is what has accumulated over the past 75k miles.
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post #4 of 11 (permalink) Old 08-30-2018, 01:07 PM
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Maybe 8k - 10k miles since rebuild.
They never touched the valves when they do the rebuild so that is what has accumulated over the past 75k miles.
I would have expected worse to.
I don't think mine are any worse, I drive it so I can hear the exhaust over the tire noise.
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post #5 of 11 (permalink) Old 08-30-2018, 02:00 PM
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Originally Posted by New to the Nox View Post
Maybe 8k - 10k miles since rebuild.
They never touched the valves when they do the rebuild so that is what has accumulated over the past 75k miles.

Thank for posting.
On the basis of that, I'm not going to be overly concerned about the valves on my 3.6L then either. In fact, rbarrios posted some pics of his a year or two ago and that was at a higher mileage also.
We only just turned over 30,000 miles on our 2015 LTZ 3.6L so don't see 75K coming up any too soon. Basically, we will do 10,000 miles a year or maybe less.
May I ask what borescope you used and is it on Amazon. . . so may there it makes my head spin and difficult to tell which are any good. I had up drain up at our cabin and sure wished I had one with 25 foot length. A snake cleared it but would have been nice to know what it looked like.
Was it this one . . ?
https://www.amazon.com/Depstech-Semi...words=depstech

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SOLD with *38,865 miles 8-15-2019.

Last edited by JayTee2014; 08-30-2018 at 02:02 PM.
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post #6 of 11 (permalink) Old 08-30-2018, 06:59 PM
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Quote:
Originally Posted by JayTee2014 View Post
Thank for posting.
On the basis of that, I'm not going to be overly concerned about the valves on my 3.6L then either. In fact, rbarrios posted some pics of his a year or two ago and that was at a higher mileage also.
We only just turned over 30,000 miles on our 2015 LTZ 3.6L so don't see 75K coming up any too soon. Basically, we will do 10,000 miles a year or maybe less.
JayTee--His engine is 2.4L, and I don't know if it's direct injection or not; I haven't plugged that info into a memory bank anywhere. If it is direct injection--as is your 3.6L--then it looks exceptionally clean, and lessens my concerns with my 3.6L in my Camaro.
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post #7 of 11 (permalink) Old 08-30-2018, 07:52 PM
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JayTee--His engine is 2.4L, and I don't know if it's direct injection or not; I haven't plugged that info into a memory bank anywhere. If it is direct injection--as is your 3.6L--then it looks exceptionally clean, and lessens my concerns with my 3.6L in my Camaro.

Agreed. . . it is a 2.4L. The 2011 is a DI engine. DI on the 2.4L happened in +2010 models. But his pics combined with the pics form rbarrios 3.6L high mileage photos ( and some others I've seen) makes for a convincing case that the carbon build up will not be that bad in 80K to 90K miles or so. I think the key is to use good Tier II fuel. That, and I run 20oz Techron Concentrated Fuel System cleaner once a year (~ 10,000 miles) in a tank of gas right before an oil change. For me, that will be coming up at the end of September.

2019 GMC Acadia SLT-1 3.6L LGX V6 - Build Date: 4-11-2019 - Bought 6-22-2019

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post #8 of 11 (permalink) Old 08-30-2018, 09:49 PM Thread Starter
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Quote:
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Originally Posted by New to the Nox View Post
Maybe 8k - 10k miles since rebuild.
They never touched the valves when they do the rebuild so that is what has accumulated over the past 75k miles.

Thank for posting.
On the basis of that, I'm not going to be overly concerned about the valves on my 3.6L then either. In fact, rbarrios posted some pics of his a year or two ago and that was at a higher mileage also.
We only just turned over 30,000 miles on our 2015 LTZ 3.6L so don't see 75K coming up any too soon. Basically, we will do 10,000 miles a year or maybe less.
May I ask what borescope you used and is it on Amazon. . . so may there it makes my head spin and difficult to tell which are any good. I had up drain up at our cabin and sure wished I had one with 25 foot length. A snake cleared it but would have been nice to know what it looked like.
Was it this one . . ?
https://www.amazon.com/Depstech-Semi...words=depstech
Different lengths available.
Good reviews.
https://www.amazon.com/Depstech-Semi.../dp/B0785H3XR7
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post #9 of 11 (permalink) Old 08-30-2018, 09:58 PM
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My 2011 3.0L V6 (bought brand new) just crossed 120,000 miles. Engine has gotten nothing but the cheapest off-brand 87 octane I can find - 95% of the time Speedway or WalMart’s Murphy Gas. Even on my long 900-Mile one-way drives, it gets Love’s, Pilot, and Wawa gas. Nothing special. Not a drop of Techron added.

No problems (so far). Now maybe the wheels will fall off the wagon tomorrow and you guys can laugh at me, but I don’t think so. The paint will be off the nose of the car before that...

2011 Equinox 1LT (new Jan 2011): Summit White / 3.0 L V6 / FWD / Pioneer Stereo / 18" Wheels / 138.2k miles [05-NOV-2019]

2002 Impala 1LT (new Jun 2002): Summit White / 3.4 L V6 / FWD / Cassette-CD Combo /225.5k miles [05-NOV-2019]
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post #10 of 11 (permalink) Old 08-30-2018, 10:06 PM Thread Starter
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Quote:
Originally Posted by JayTee2014 View Post
Quote:
Originally Posted by c&wsinbad View Post
JayTee--His engine is 2.4L, and I don't know if it's direct injection or not; I haven't plugged that info into a memory bank anywhere. If it is direct injection--as is your 3.6L--then it looks exceptionally clean, and lessens my concerns with my 3.6L in my Camaro.


Agreed. . . it is a 2.4L. The 2011 is a DI engine. DI on the 2.4L happened in +2010 models. But his pics combined with the pics form rbarrios 3.6L high mileage photos ( and some others I've seen) makes for a convincing case that the carbon build up will not be that bad in 80K to 90K miles or so. I think the key is to use good Tier II fuel. That, and I run 20oz Techron Concentrated Fuel System cleaner once a year (~ 10,000 miles) in a tank of gas right before an oil change. For me, that will be coming up at the end of September.
Yes, it's a DI engine.

I did put a couple of bottles of Gumout One-N-Done through a few months ago which did clear out all the carbon on the piston heads. There was quite a bit of it too - black and thick. Since tgat did such a good job on the pistons, some of it might have gotten on the back of the valves? But tgen that is the problem with DI engines. The gasoline generally doesn't get back there.

Jeff from Iowa, Purchased 2011 Nox in Nov. 2016, Manufacture date 10-10, 2.4l, AWD
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