Cylinder #7 down on compression

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Inertia said:
I'm just passing on 40 yrs experience working then owning a large auto repair center in our Capital city.
I had an outstanding mentor, and I trained 3 apprentices.
If one of my mechanics showed me that piston, compared to others, I'd want to know why, and certainly warn the customer that something was awry.
I come here to share my knowledge and experience, while "hunting" on a different site .

And miss the juicy stuff from those on ignore, rofl
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I understand where you are coming from. I am going to stop by Advanced Auto on my way home from work and I will do a wet leak down and see what happens. What should I use for the test? Paint Thinner? I don't see myself pulling the engine and doing a complete rebuild at this point in my life. I have a wife who hates that I spend so much time in the garage, a son in his first year of college and I just found out the subframe on my 08 Police package Charger has a bad subframe so money is not easy to come by. I am going to clean up the pistons the best I can and hope and pray that whatever you don't like about #5, I think that's the piston you're referring to is from a previous problem. I'll keep you all posted.
 
gtgto said:
I understand where you are coming from. I am going to stop by Advanced Auto on my way home from work and I will do a wet leak down and see what happens. What should I use for the test? Paint Thinner? I don't see myself pulling the engine and doing a complete rebuild at this point in my life. I have a wife who hates that I spend so much time in the garage, a son in his first year of college and I just found out the subframe on my 08 Police package Charger has a bad subframe so money is not easy to come by. I am going to clean up the pistons the best I can and hope and pray that whatever you don't like about #5, I think that's the piston you're referring to is from a previous problem. I'll keep you all posted.
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Hey, look at the bright side, you might wet test it, and they all hold fluid evenly, lol, then you can come back here and tell everyone my asshole is sucking wind, and I guess I would deserve it.
Should be able to get cleaning solvent, or varsol at the parts store, kerosene.
If nec, I would just slap the repaired heads on, totally understandable, but you at least know that plug will likely foul, put another plug in carry on.
Done that to many vehicles too, including my own, lol
What were the old plugs like, are they around?
Good luck .
 
Inertia said:
Hey, look at the bright side, you might wet test it, and they all hold fluid evenly, lol, then you can come back here and tell everyone my asshole is sucking wind, and I guess I would deserve it.
Should be able to get cleaning solvent, or varsol at the parts store, kerosene.
If nec, I would just slap the repaired heads on, totally understandable, but you at least know that plug will likely foul, put another plug in carry on.
Done that to many vehicles too, including my own, lol
What were the old plugs like, are they around?
Good luck .
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Post 15 of this thread has a couple of pics of the plugs I pulled out. #5 seems to be the one being talked about.
 
gtgto said:
Post 15 of this thread has a couple of pics of the plugs I pulled out. #5 seems to be the one being talked about.
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I kinda look at it as if you walked down a rack of servers, and one was different, looked funny, maybe discolored by heat, label melted, or some such.
You have a choice, report it, or ignore it, this is kinda your choice.
 
Can you give us the specific spark plug number. It’s on the plug.

Not really sure the point in cleaning off the pistons. If you insist, do the grease thing like mentioned earlier.

I’m always amazed when people are surprised that their 55 year old motor doesn’t have original parts in it. Nearly all piston replacements in the late 70s, 70s and 90s were low compression due to available gas.

If it blows 150 psi when you are done, it’s probably because it has a replacement cam too.

Consider a shim head gasket for installation.
 
BSB67 said:
Can you give us the specific spark plug number. It’s on the plug.

Not really sure the point in cleaning off the pistons. If you insist, do the grease thing like mentioned earlier.

I’m always amazed when people are surprised that their 55 year old motor doesn’t have original parts in it. Nearly all piston replacements in the late 70s, 70s and 90s were low compression due to available gas.

If it blows 150 psi when you are done, it’s probably because it has a replacement cam too.

Consider a shim head gasket for installation.
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BSB67 said:
Can you give us the specific spark plug number. It’s on the plug.

Not really sure the point in cleaning off the pistons. If you insist, do the grease thing like mentioned earlier.

I’m always amazed when people are surprised that their 55 year old motor doesn’t have original parts in it. Nearly all piston replacements in the late 70s, 70s and 90s were low compression due to available gas.

If it blows 150 psi when you are done, it’s probably because it has a replacement cam too.

Consider a shim head gasket for installation.
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Look how much better that looks. The head gasket I took out was a Permatex 8553 I think. The plugs are NGK V-Power GR4

IMG_6130.jpeg


IMG_6129.jpeg


IMG_6128.jpeg


IMG_6117.jpeg
 
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