2006 Infiniti Vk45de blow by after rebuild

Forum for Infiniti M35 and M45, and Nissan Fuga owners.
Tycoant
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Car: 2006 Infiniti M45

2006 Infiniti Vk45de blow by after rebuild

Postby Tycoant » Mon Oct 11, 2021 7:29 pm

So I just had my motor rebuilt it is a 2006 Infiniti M45 (Vk45de) now that the car is all back together it has a extreme amount of blow by, so when you first start the car it runs great then the blow by loads up and eventually kills the motor. I don’t know if a ring on a piston was installed incorrectly or what but any help or Direction would be greatly appreciated, thank you.


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VStar650CL
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Re: 2006 Infiniti Vk45de blow by after rebuild

Postby VStar650CL » Tue Oct 12, 2021 3:50 am

If it's a mis-installed ring, a wet compression test will show it up. Make sure the PCV system isn't mis-routed and the PCV Valve isn't stuck.

EdBwoy
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Re: 2006 Infiniti Vk45de blow by after rebuild

Postby EdBwoy » Tue Oct 12, 2021 1:15 pm

Just to be clear, when you say an extreme amount of blow-by, you're referring to smoke coming out of your tailpipe, right?
Tycoant wrote:
Mon Oct 11, 2021 7:29 pm
... so when you first start the car it runs great then the blow by loads up and eventually kills the motor...
There is a common issue with smoking at startup that is usually indicative of the PCV system failure. This one usually gets better after the engine warms up and for that, we usually check the tubing and also replace the PCV valves if needed.
What you are describing though, is the less desirable kind of smoking - getting worse after it warms up.

What I would likely do, is just tap into the workmanship warranty. There is no way that is normal, even on my 200k-mile engines. So I wouldn't accept it after spending the money to rebuild it and install it.

Out of curiosity though, I would try to at least identify the nature of the blow-by. Is it whitish and moist with a sweet smell?
Or is it dark blue and stinks?
Or is is gray-white and dusty?
Check to see if you are losing either coolant or oil from your reservoir/dipstick.

EdBwoy
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Re: 2006 Infiniti Vk45de blow by after rebuild

Postby EdBwoy » Tue Oct 12, 2021 1:16 pm

If I may ask, why was the engine rebuilt? What happened to it in the first place?

LIBRILZ
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Re: 2006 Infiniti Vk45de blow by after rebuild

Postby LIBRILZ » Tue Oct 12, 2021 2:03 pm

EdBwoy wrote:
Tue Oct 12, 2021 1:15 pm
Just to be clear, when you say an extreme amount of blow-by, you're referring to smoke coming out of your tailpipe, right?
Tycoant wrote:
Mon Oct 11, 2021 7:29 pm
... so when you first start the car it runs great then the blow by loads up and eventually kills the motor...
There is a common issue with smoking at startup that is usually indicative of the PCV system failure. This one usually gets better after the engine warms up and for that, we usually check the tubing and also replace the PCV valves if needed.
What you are describing though, is the less desirable kind of smoking - getting worse after it warms up.

What I would likely do, is just tap into the workmanship warranty. There is no way that is normal, even on my 200k-mile engines. So I wouldn't accept it after spending the money to rebuild it and install it.

Out of curiosity though, I would try to at least identify the nature of the blow-by. Is it whitish and moist with a sweet smell?
Or is it dark blue and stinks?
Or is is gray-white and dusty?
Check to see if you are losing either coolant or oil from your reservoir/dipstick.
Where do you get your replacement PCV valves from? I always chocked that up to some inherent VK design flaw, But' i've also thought, if the engine had a real design flaw it would burn wayyyyy more oil, not just at start up lol.

Tycoant
Posts: 3
Joined: Mon Oct 11, 2021 12:21 pm
Car: 2006 Infiniti M45

Re: 2006 Infiniti Vk45de blow by after rebuild

Postby Tycoant » Tue Oct 12, 2021 9:37 pm

EdBwoy wrote:
Tue Oct 12, 2021 1:15 pm
Just to be clear, when you say an extreme amount of blow-by, you're referring to smoke coming out of your tailpipe, right?
Tycoant wrote:
Mon Oct 11, 2021 7:29 pm
... so when you first start the car it runs great then the blow by loads up and eventually kills the motor...
There is a common issue with smoking at startup that is usually indicative of the PCV system failure. This one usually gets better after the engine warms up and for that, we usually check the tubing and also replace the PCV valves if needed.
What you are describing though, is the less desirable kind of smoking - getting worse after it warms up.

What I would likely do, is just tap into the workmanship warranty. There is no way that is normal, even on my 200k-mile engines. So I wouldn't accept it after spending the money to rebuild it and install it.

Out of curiosity though, I would try to at least identify the nature of the blow-by. Is it whitish and moist with a sweet smell?
Or is it dark blue and stinks?
Or is is gray-white and dusty?
Check to see if you are losing either coolant or oil from your reservoir/dipstick.
No the blow by is in the engine not coming out of the tail pipe, the motor was rebuilt after sucking up water and bending rod number 8, the blow bu builds up in the engine so much that it eventually kills it, figured this out after taking one of the hoses for the PCV off and it’s like a train blowing, not a normal amount

EniGmA1987
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Re: 2006 Infiniti Vk45de blow by after rebuild

Postby EniGmA1987 » Wed Oct 13, 2021 7:31 am

I would go through and check all the hoses and where they connect for the PCV system, as well as the PCV valve itself.

Tycoant
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Joined: Mon Oct 11, 2021 12:21 pm
Car: 2006 Infiniti M45

Re: 2006 Infiniti Vk45de blow by after rebuild

Postby Tycoant » Wed Oct 13, 2021 10:05 am

Also forgot to mention!!, I don’t think the rings have had time to seat because it hasn’t been broken in but I can’t break it in because it dies, I going to try a new Throttlebody to see if that will keep it running longer so that maybe everything tolerance wise, will get where they need to be.


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