2G DSM 6BOLT BOTTOM 7 BOLT HEAD

[JASON4G63]

Hello everyone my first time posting here hope I can get some help here.

So I got my short block rebuilt like 3 years ago by a mechanic was my first time also having him work on my car the short block had to be refreshed because my car overheated once after that one time compression started going lower lil by lil so the work that was done to the car was. DIDNT BORE THE CYLINDER WALLS JUST A SLIGHT HONING NEW CRANK BEARINGS NEW PISTON RINGS AND REUSED OLD PISTONS. Car ran fine for about 200 miles but after those 200 miles started smoking in tought it was a bad turbo so replaced it didn't fix the problem did a leak down test all cilynder were between 12 and 20% leak down compression. Was ok above 130 I tought it was valve guides replaced the guides and seals and still didn't fix the problem so when the car is under load cold start smokes when idling it stops smoking a lil.

DOES IT SOUND LIKE PISTON RINGS FAILED? Any help is appreciated also exhaust ports are oily wet and I also shared a video using a borescope to look inside the cylinders and when the valves open oil drips to the top of the piston hope I get some help thanks thanks

You must be logged in to view this image or video.

You must be logged in to view this image or video.

You must be logged in to view this image or video.

You must be logged in to view this image or video.

You must be logged in to view this image or video.

You must be logged in to view this image or video.

 

[miliman13]

Original assumptions removed due to having to re - read your post and missing information you already provided

Respectfully I recommend you break up your text so it’s easier to read, I had to read your post several times ( cuz I’m old).

If English is not your first language, I recommend using any search engine they have built in translators.

Otherwise take the time to review your post for typos, you will get better responses from more qualified people on here.

 

[JASON4G63]

You mentioned the only thing not replaced when the block was rebuilt was the pistons rings.

You also mentioned that you found oil in the exhaust ports.

It seems like you have found your potential source of problems.

But since your results are promising
It could be your valve stem seals

Respectfully I recommend you break up your text so it’s easier to read, I had to read your post several times ( cuz I’m old).

If English is not your first language, I recommend using any search engine they have built in translators.

Otherwise take the time to review your post for typos, you will get better responses from more qualified people on here.

Ok so work that was done to the short block was honing, new pistons rings,new bearings that was all we didn't bore the short block but we did re use the same piston ,yes the exhaust ports to exhaust manifold are covered with burnt oil and yes sometimes my phone typos. Are wrong ....

 

[pauleyman]

When you ran the leakdown did you listen for where it was leaking? Were cams in place?

 

[JASON4G63]

When you ran the leakdown did you listen for where it was leaking? Were cams in place?

Yes cams were in place... you were able to hear it leaking trough the dipstik tube and as well some at the exhaust

 

[DSMPT]

DIDNT BORE THE CYLINDER WALLS JUST A SLIGHT HONING NEW CRANK BEARINGS NEW PISTON RINGS AND REUSED OLD PISTONS

It's a normal process for replacing only rings.

DOES IT SOUND LIKE PISTON RINGS FAILED?

There's a chance that cylinders have oil controlling issue even you have good compression/leakdown result. But we can't tell yet. That's the last thing to be determined after checking everything. If the oil is coming up from the crank case through the rings, you may have oil in intake ports, too. Should remove the intake manifold to check it. If the throttle body is totally dry but you have oil in the intake manifold, then the oil is coming from PCV valve or valve stem seals/valve guides or crank case. If the intake side is all dry or not abnormally wet, then check the exhaust side. If only exhaust side is wet, then the valve stem seals/valve guides or turbo hot side is probably the cause.

I also shared a video using a borescope to look inside the cylinders

Where is it?

Anyways there are many possibility to cause smoke. You should delete the possibility one by one.
- Are inside intercooler, its pipings, throttle body and intake manifold dry?
- Doesn't the smoke gets less when you rev up? If it does, the turbo may be needed to be rebuilt.
- Not over heating the engine? If it is, the head gasket is blown.
Etc etc..

Yes cams were in place... you were able to hear it leaking trough the dipstik tube and as well some at the exhaust

Did you rotate the crank 180 degree each time when you switch the cylinder? The cylinder you are testing must be in the end of compression stroke. If you started testing from cylinder #1, when you switch the cylinder, rotate the crank 180 degree and go to cylinder #3, then #4 and #2.

Testing Cylinder #1 = Cam dowel pins at 12 o'clock.
Testing Cylinder #3 = Cam dowel pins at 3 o'clock.
Testing Cylinder #4 = Cam dowel pins at 6 o'clock.
Testing Cylinder #2 = Cam dowel pins at 9 o'clock.

 

[JASON4G63]

It's a normal process for replacing only rings.

There's a chance that cylinders have oil controlling issue even you have good compression/leakdown result. But we can't tell yet. That's the last thing to be determined after checking everything. If the oil is coming up from the crank case through the rings, you may have oil in intake ports, too. Should remove the intake manifold to check it. If the throttle body is totally dry but you have oil in the intake manifold, then the oil is coming from PCV valve or valve stem seals/valve guides or crank case. If the intake side is all dry or not abnormally wet, then check the exhaust side. If only exhaust side is wet, then the valve stem seals/valve guides or turbo hot side is probably the cause.


Where is it?

Anyways there are many possibility to cause smoke. You should delete the possibility one by one.
- Are inside intercooler, its pipings, throttle body and intake manifold dry?
- Doesn't the smoke gets less when you rev up? If it does, the turbo may be needed to be rebuilt.
- Not over heating the engine? If it is, the head gasket is blown.
Etc etc..


Did you rotate the crank 180 degree each time when you switch the cylinder? The cylinder you are testing must be in the end of compression stroke. If you started testing from cylinder #1, when you switch the cylinder, rotate the crank 180 degree and go to cylinder #3, then #4 and #2.

Testing Cylinder #1 = Cam dowel pins at 12 o'clock.
Testing Cylinder #3 = Cam dowel pins at 3 o'clock.
Testing Cylinder #4 = Cam dowel pins at 6 o'clock.
Testing Cylinder #2 = Cam dowel pins at 9 o'clock.

Ok so yes for some reason the throttle body IC AND PIPPING IS DRY ...yes the intake manifold everytime i removed it it has oil in it turbo compressor is dry when I doubt it's gonna be the pcv because I installed a catch can and didn't catch any oil ...




And no it's the opposite when I rev it and let off smokes also while cruising smokes. And no overheating at all



And yes I did made sure that whatever cylinder I was testing was at the compression stroke.... some one said that probably since o didn't bore the cylinders that probably the cylinders are in oval shape and that's causing the oil wiper ring to fail

 

[JASON4G63]

It's a normal process for replacing only rings.

There's a chance that cylinders have oil controlling issue even you have good compression/leakdown result. But we can't tell yet. That's the last thing to be determined after checking everything. If the oil is coming up from the crank case through the rings, you may have oil in intake ports, too. Should remove the intake manifold to check it. If the throttle body is totally dry but you have oil in the intake manifold, then the oil is coming from PCV valve or valve stem seals/valve guides or crank case. If the intake side is all dry or not abnormally wet, then check the exhaust side. If only exhaust side is wet, then the valve stem seals/valve guides or turbo hot side is probably the cause.


Where is it?

Anyways there are many possibility to cause smoke. You should delete the possibility one by one.
- Are inside intercooler, its pipings, throttle body and intake manifold dry?
- Doesn't the smoke gets less when you rev up? If it does, the turbo may be needed to be rebuilt.
- Not over heating the engine? If it is, the head gasket is blown.
Etc etc..


Did you rotate the crank 180 degree each time when you switch the cylinder? The cylinder you are testing must be in the end of compression stroke. If you started testing from cylinder #1, when you switch the cylinder, rotate the crank 180 degree and go to cylinder #3, then #4 and #2.

Testing Cylinder #1 = Cam dowel pins at 12 o'clock.
Testing Cylinder #3 = Cam dowel pins at 3 o'clock.
Testing Cylinder #4 = Cam dowel pins at 6 o'clock.
Testing Cylinder #2 = Cam dowel pins at 9 o'clock.

Also after it started smoking i got a full cylinder head job thinking it was guides or stem seals prior to that I had replaced the stem seals once by me and when I got the car running the cylinder head was serviced as well ....

 

[pauleyman]

Also after it started smoking i got a full cylinder head job thinking it was guides or stem seals prior to that I had replaced the stem seals once by me and when I got the car running the cylinder head was serviced as well ....

I guess you have your answer. Pull the motor.

 

[1990TSIAWDTALON]

Ok so work that was done to the short block was honing, new pistons rings,new bearings that was all we didn't bore the short block but we did re use the same piston rings,yes the exhaust ports to exhaust manifold are covered with burnt oil and yes sometimes my phone typos. Are wrong ....

In this post, you say you RE-USED the piston rings. If so, there is your oil problem. If it was a typo, just correct that statement so there is no confusion.

 

[JASON4G63]

In this post, you say you RE-USED the piston rings. If so, there is your oil problem. If it was a typo, just correct that statement so there is no confusion.

My bad no I didn't re use piston rings i re used the pistons

 

[92AWDHX40]

Sounds like you may want to pull it anyway and go through it step by step to eliminate any concerns. You never know what you may have missed trust I just found out
With a head with matched valve guides. Pats used and this was missed

 

[JASON4G63]

Sounds like you may want to pull it anyway and go through it step by step to eliminate any concerns. You never know what you may have missed trust I just found out
With a head with matched valve guides. Pats used and this was missed

Damm yeah I am pulling it i got a built short block that ima trow in but just wanted to see if anyone ever had same issue?