Hi,
My B16A has recently been rebuilt and it's burning a lot of oil, especially under load and deceleration. At idle it's fine. Pulled the head off and found oil at the back of the intake valves, more on cylinder #1 but with every cylinder having a slight bit of oil accumulated at the back of the valves, the pic below is from cylinder #1.


Had a different machine shop check the valve seals and valve guides. Seals were installed right and have no signs of damage. Guides were checked and are within service limits. The head was pressure tested to eliminate any possibility of damage, and it's sealing perfectly. PCV valve was checked and is working fine, with no signs of oil. The bottom end was also checked, rings are fine with no signs of any compression leak by the skirts and no damage to the oil control rings (Hastings rings). Thinking about it, I wouldn't believe bad rings would cause so much oil to be accumulated at the back of the valves like this, even with oil control rings totally wrecked. And yes, the car smokes a whole lot, not even remotely close to the engine running before the rebuild.

 

Have a serious discussion with this^ shop. Get a refund or insist they properly install the valve seals.

 

I had it verified on a different machine shop than the one that installed it, as it's far from where I am and to avoid any "Well, not our fault, it's fine, carry on" type of situation as I wouldn't be able to see them verifying it. Could I have messed up assembling or breaking in the bottom end so the oil rings are not sealing causing this? Or judging by the picture it's very unlikely?

 

Post recent compression numbers for all 4 cylinders.

 

Unfortunately I didn't get to do a compression test as the engine was burning oil so bad I didn't bother, looking back, I should have done it. The engine did run at idle for a considerable amount of time due to some cooling issues I had to troubleshoot, bleed the cooling system 3 times and all. I suspect my cylinders are glazed so the rings didn't seat properly. Could bad rings cause this issue and make oil accumulate behind the intake valves?

 

Compression test the cylinders. Post the numbers, and then go from there.

 

If that pic is the back of the intake valves, then either you have bad valve seals/guides or oil is some how managing to get into the intake manifold and be sucked into the intake ports. did you mess with the valve cover? There is a baffle on the cover, did you remove it? Did you over fill the engine with oil?
You say it smokes most with DEACCELERATION, that says its smoking in a high vacuum situation, so its sucking in the oil to the compression chamber. I presume this engine is a VTEC, is the gasket good, not just external leaks but leaks in-between the ports of the vtec solenoid.
The only way that bad rings would cause oil to collect BEHIND the valves, oh wait there is no way rings could cause that
Check the PVC valve again https://repairpal.com/pcv-valve
I willing to bet that the PVC valve is stuck open and your sucking oil into the intake manifold

 

It's your valve seals as mentioned. Or your valve guides at messed up and allowing oil to pass through them