SPONSORED LINKS

Red hot exhaust

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,816 POSTS
Hi,

I can't guarantee it, but I think we found the problem. Inspect them for clearance and let me know what you find. I'm really interested in knowing. I have a feeling this is the cause. Also, that could be the noise we hear when it's running.

Take care,

Joe
SPONSORED LINKS
Was this
answer
helpful?
Yes
No
Thursday, June 24th, 2021 AT 8:21 PM
Tiny
WHITESHIRTSAMMY
  • MEMBER
  • 60 POSTS
Hello, I am back on this. I took the head off to inspect for valve damage since I overheated the engine exhaust, a few times. I don't see any damage but I don't have a trained eye. How can I verify that all the valves are seating correctly?
Images (Click to make bigger)
Thumb
Thumb
Was this
answer
helpful?
Yes
No
Sunday, September 5th, 2021 AT 2:46 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,816 POSTS
Hi,

Since the engine didn't overheat, it should be fine. Take a bright flashlight and shine it on each valve in the head. See if there is any light going through. You will see it if there is an issue. You will be able to see it in the inlet/exhaust ports on the head.

Let me know what you find.

Joe
Was this
answer
helpful?
Yes
No
Sunday, September 5th, 2021 AT 6:42 PM
Tiny
WHITESHIRTSAMMY
  • MEMBER
  • 60 POSTS
Checked all the valves via exhaust/intake, no light passes. But if the air is not escaping through the valve where then.

What can I check?
Was this
answer
helpful?
Yes
No
Monday, September 6th, 2021 AT 3:45 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,816 POSTS
Did you adjust the valves before removing the head?
SPONSORED LINKS
Was this
answer
helpful?
Yes
No
Monday, September 6th, 2021 AT 7:03 PM
Tiny
WHITESHIRTSAMMY
  • MEMBER
  • 60 POSTS
No. I was unable to build compression on the #1 cylinder, which is one of the steps needed, even after disengaging the push rod for the #1 cylinder and the compression gauge installed. This is what lead me to believe that I damaged the valves when the exhaust overheated causing them not closing all the way. When I was turning the crankshaft, I was able to clearly hear the air escaping from the #1 cylinder.
Was this
answer
helpful?
Yes
No
Tuesday, September 7th, 2021 AT 7:03 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,816 POSTS
Were you getting any compression from number 1? If you were getting nothing, it does sound like a valve was stuck open.

Let me know.
Joe
Was this
answer
helpful?
Yes
No
Tuesday, September 7th, 2021 AT 6:54 PM
Tiny
WHITESHIRTSAMMY
  • MEMBER
  • 60 POSTS
Now that I have know I did not damage the head or the valves, I am going to get me a new head gasket, put it back together and see what I get.

I will report back in a few weeks.
Was this
answer
helpful?
Yes
No
Wednesday, September 8th, 2021 AT 5:44 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,816 POSTS
Were you getting any compression from cylinder 1 before taking it apart? Also, make sure to adjust the valve lash before trying to start it.

Let me know how things turn out. I'm interested in knowing.

Take care,

Joe
Was this
answer
helpful?
Yes
No
Wednesday, September 8th, 2021 AT 7:41 PM
Tiny
WHITESHIRTSAMMY
  • MEMBER
  • 60 POSTS
Okay, so, I got a new head gasket, reinstalled the cylinder head, and torqued it down. I am still having the same problem. I cannot build pressure in the #1 cylinder. Initially, I thought it was leaking thru the gauge, so I took it out and installed the spark plug; still, same.

It must be leaking through the valve.
Image (Click to make bigger)
Thumb
Was this
answer
helpful?
Yes
No
Thursday, October 28th, 2021 AT 6:02 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,816 POSTS
Hi,

Are you getting any compression from cylinder one?

Let me know.

Joe
Was this
answer
helpful?
Yes
No
Thursday, October 28th, 2021 AT 7:56 PM
Tiny
WHITESHIRTSAMMY
  • MEMBER
  • 60 POSTS
My apologies. I am not using the correct terminology.

I am not getting compression on the number one cylinder after reinstalling the cylinder head with a new head gasket and spark plug fully installed. When I manually turn the crankshaft, I hear air escaping from somewhere.

That last picture is of the number one cylinder before I reinstalled the cylinder head.
SPONSORED LINKS
Was this
answer
helpful?
Yes
No
Monday, November 1st, 2021 AT 6:55 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,816 POSTS
Okay, if you hear air escaping, try this. Either it will be going through the intake, exhaust, or if the rings are bad enough, through the crankcase which is unlikely.

Remove the inlet air tube between the throttle body and air filter box. See if you can hear it there. If nothing, then remove the oil fill cap to see if it sounds like it is coming from there. If not, then the exhaust is left.

Is there any compression being produced by cylinder 1?

https://www.2carpros.com/articles/how-to-test-engine-compression

Let me know

Joe
Was this
answer
helpful?
Yes
No
Monday, November 1st, 2021 AT 9:50 PM
Tiny
WHITESHIRTSAMMY
  • MEMBER
  • 60 POSTS
This is how the engine sits right now in my driveway.
Image (Click to make bigger)
Thumb
Was this
answer
helpful?
Yes
No
Wednesday, November 3rd, 2021 AT 2:37 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,816 POSTS
Hi,

It looks new. Does the cylinder create any compression? If you test it by placing about a tablespoon of oil in it, does the compression increase?

It's hard to tell looking at a pic, but are any of the valves even open in the pic?

Joe
Was this
answer
helpful?
Yes
No
Wednesday, November 3rd, 2021 AT 5:14 PM
Tiny
WHITESHIRTSAMMY
  • MEMBER
  • 60 POSTS
None of the pushrods are installed. All the valves are in the closed position.

I will try the tablespoon of oil and report back.
Was this
answer
helpful?
Yes
No
Wednesday, November 3rd, 2021 AT 5:22 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,816 POSTS
Hi,

If that makes a difference, it indicates an issue with the rings. Let me know what the compression is both before testing dry and after testing it wet.

Joe
Was this
answer
helpful?
Yes
No
Wednesday, November 3rd, 2021 AT 5:32 PM
Tiny
WHITESHIRTSAMMY
  • MEMBER
  • 60 POSTS
Okay, I pour some engine oil into the #1 cylinder, no change. I can still hear air escaping and do not build compression.
Was this
answer
helpful?
Yes
No
Monday, November 15th, 2021 AT 1:49 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,816 POSTS
Is it truly no compression? I ask because if the piston is moving, there should be some. The only thing that would cause 0 compression would be open valves or extreme clearance between the piston rings and the cylinder (or a piston that isn't moving). Even bad rings create some compression.

If I recall, you did this with the rocker arms off, correct? If so, by any chance do you have an automotive stethoscope? If you do, see if you can determine where the noise (air escaping) is loudest. For example, near the exhaust manifold or intake manifold vs the oil fill. I need to know what that sound is coming from.

Let me know if it is 0. That is going to direct me best.

Joe
Was this
answer
helpful?
Yes
No
Monday, November 15th, 2021 AT 5:55 PM
Tiny
WHITESHIRTSAMMY
  • MEMBER
  • 60 POSTS
After I messaged you, I had a bright idea to turn the compression gauge upside down so I can see it from underneath the vehicle. As I am manually turning the crank, I can get about 20PSI on the gauge. It quickly goes away if I stop turning.
Was this
answer
helpful?
Yes
No
Wednesday, November 17th, 2021 AT 4:25 PM

Please login or register to post a reply.

Related Exhaust Manifold Content

Exhaust Manifolds Front Accessories
VIDEO
Exhaust Manifolds Front Accessories
Instructional repair video
Exhaust Manifold Gasket Replacement
GUIDE
Exhaust Manifold Gasket Replacement
Removing and reinstalling an exhaust manifold and gasket is a critical task in automotive maintenance. This guide will take you through the step-by-step process, ensuring a...
VIEW MORE

Sponsored links