Problems ALREADY! (engine knocking at certain RPM - HR16DE - solved)

[gonzagnr]

so despite the compression "issue", is the new short block knock free???
which engine number does new short block have??

[IMPUL]

I'll find out tmw when I pick it up.

[IMPUL]

Hahahahaha still has the same noise... Quieter .. But it's still there in the same rev range. So I'll do my oil change, mention it to them, wait for second oil change see if it gets louder, if it does, next engine please. I'm Gunnar call Nissan about the comp test. They were all 180psi +/- 1 psi. But minimum by the FSM I found says 184psi is the minimum. But Nissan says it's to spec.
If that is the correct spec for the micra, then it's hard to believe that it's a true 9.8:1 CR.

Engine code 739242L

[gonzagnr]

Well there was a very high possibility to the new engine to still knock.
Sad to hear that.
In my case car wont be ready in near future lol.
Today they were meassuring crank to bearing clearence and was wrong.
So they had to oder special rod bearing size to factory.
They say this will take 2 weeks, also the crank was going to take 2 weeks and in the end were 3 month.
This is a *****ing nightmare.
I really wish this to be acomplished.
The same day i get the car back i will go and trade it in i dont care of they give me 1 dollar, thats fair for me.

[IMPUL]

Well there was a very high possibility to the new engine to still knock.
Sad to hear that.
In my case car wont be ready in near future lol.
Today they were meassuring crank to bearing clearence and was wrong.
So they had to oder special rod bearing size to factory.
They say this will take 2 weeks, also the crank was going to take 2 weeks and in the end were 3 month.
This is a *****ing nightmare.
I really wish this to be acomplished.
The same day i get the car back i will go and trade it in i dont care of they give me 1 dollar, thats fair for me.

I will gladly give you $1.00 USD for your car. If your happy with that so am I.

[IMPUL]

I contacted Nissan canada to confirm micra compression test limits.

When reviewing my results my lowest reading is almost 14.5psi the minimum acceptable limit.

I wonder if they are interpreting the differential between cyl limit, as the below spec limit?

But so far the over the phone answer was "those are ball park figures, rough guidelines, If the tech says they are good, there good."

[gonzagnr]

Here i have more usefull data that will help to understand the size of this problem better.
Tech told me that they where using the rod bearing size according to the code for each conrod attachment to the crank and despite that clearence was wrong.
After that told me factory has made recently new technical tips about this.
Thats why they are meassuring EVERYTHING and thats why they have to order new size bearings because the ones suggested by nissan DOES NOT MEET THE CLEARENCE.
So in my opinion thats why almost every engine knock.
Stock 100% brand new part dont meet the factory aceptable clearence.
He gave me his word the repair will be flawless.
But after that information i can say there is 0 QC in the factory and they dont give a damn about the quality of the engines they are building.

[Luki_qc]

Hi, first post here. I've been lurking on this thread. I have a new 2015 Micra S. (from Montreal)

So they figure that installing correct sized rod bearings will fix the issue permanently? If they figure this out, I will be much relieved and will consider getting mine done at that point. I figure it's useless making a big fuss now if the current "fix" is just to install new bad parts.

Keep us updated!

[gonzagnr]

Hi, first post here. I've been lurking on this thread. I have a new 2015 Micra S. (from Montreal)

So they figure that installing correct sized rod bearings will fix the issue permanently? If they figure this out, I will be much relieved and will consider getting mine done at that point. I figure it's useless making a big fuss now if the current "fix" is just to install new bad parts.

Keep us updated!

replaceing only rod bearings is not the best fix because there is damage on the crank and also metal fatigue on cylinder 2 conrod because of the knock, these engines throw the rod because of metal fatigue.
every crankshaft on this engines comes with a code were each rod bearing goes, that code gives the rod bearing size to use.
they told me that after fixing the suggested (by nissan procedure) rod bearing size the clearence was wrong in 2 main bearings.
so after knowing exactly how bad the clearence was they ordered "correct" size rod bearing to have an aceptable clearence value.
i was told that by this codes is how they assembly the engines in the factory, so, is very clear why the engines are knocking.
they promissed that the engine will be well built, with all good clearenced and knock free.
so if you want to keep the car, i suggest you go to the dealer and ask them how they think this issue has to be fixed, i really trust the techs that are working on my engine and i agree with them this is a good solution.
also asked them what happen if even with new rod bearing size clearences are wrong, they told me they will request another new crank and 4 new conrods and try again, as i said before, i really trust these guys, they are trying to do things the right way, saddly they have to deal with low quality parts and/or incorrect codes on parts.
Luki_qc, do you have video of your car knock???

[Luki_qc]

I do, I will upload tomorrow. It's subtle, but it is there. A machinegun/diesel motor knock between 2k-3k rpm.

Regardless, this is one awesome little car. Hopefully everything will turn out fine. We have no plans of getting rid of it.