MotorGuru:
The intake valve was damaged.

Could there have been a possibility of the engine ingesting a foreign object apart form air?

diportivo:
gazzuzz

u need to do valentine's day giveaway so this oye ekiti domiciled lecturer can let u rest

if this can happen to a well maintained car,what's the fate of badly maintained ones??

I'm sure this occurs often....has to be something about the engine itself

nurey:
The lambda 3.3L V6 has been known to require valve adjustment like the old days, because obviously the design engineers skipped it.

“A noisy valve is a happy valve.” Sort of true- way too loose can make the thing wear out faster (although way too tight can burn a valve during one good highway run.)

You burned the valve during a good highway run, crown bent first, on the return leg, it hit the piston at and odd angle like a knife through butter trapped on the piston, the continous movement finished the remaining work.

MotorGuru:


Interesting perspective:

But i think this engine uses bucket shims in which any adjustment would require the replacement of the shim (unlike Honda K24 engines). Do you mean that it required the inspection and replacement of all 24 valve shims at specific mileages?

Btw this engine was fist introduced in 2006.

GAZZUZZ:


you are correct, no valve adjustment, engine was exactly 100,004miles when it left workshop.

MotorGuru:


Interesting perspective:

But i think this engine uses bucket shims in which any adjustment would require the replacement of the shim (unlike Honda K24 engines). Do you mean that it required the inspection and replacement of all 24 valve shims at specific mileages?

Btw this engine was fist introduced in 2006.

fuckboys:
Well I see no build up of carbon from the pics tho, but what if all carbon buildup has been cleaned thoroughly prior to the picture taken?. That's another dimension to look Sha, just thinking out loud

fuckboys:
Well I see no build up of carbon from the pics tho, but what if all carbon buildup has been cleaned thoroughly prior to the picture taken?. That's another dimension to look Sha, just thinking out loud

MotorGuru:


That would be very unlikely.
This is a port injected engine and not a direct injected one, so the intake valves will always be clean, as it receives a steady rinse from the injectors ( nozzles)

If it was a GDI engine, then seeing carbon buildup at the intake valve will not be a surprise.

GAZZUZZ:


seems you don't understand the 3 jesters up there. He is antiGazzuzz, masturbates on any thread I create.

MotorGuru:


Interesting perspective:

But i think this engine uses bucket shims in which any adjustment would require the replacement of the shim (unlike Honda K24 engines). Do you mean that it required the inspection and replacement of all 24 valve shims at specific mileages?

Btw this engine was fist introduced in 2006.

9icetoo:
Here is what I think.
That particular cylinder developed a hot spot, probably on a plug which lead to detonation. This detonation created pits on the cylinder head.
Each time plugs are changed, the symptom goes away until more materials are deposited from the pit on the new plug and the cycle starts all over again.
Eventually, the detonation (preignition) melts the top of the piston.
What I don't get is what broke off the valve.

9icetoo:
Here is what I think.
That particular cylinder developed a hot spot, probably on a plug which lead to detonation. This detonation created pits on the cylinder head.
Each time plugs are changed, the symptom goes away until more materials are deposited from the pit on the new plug and the cycle starts all over again.
Eventually, the detonation (preignition) melts the top of the piston.
What I don't get is what broke off the valve.

ojeysky:


Imagine a doctor that takes his sick patient to his colleagues for team work diagnosis yet shield the details of the patient from them.....I hope you will agree it doesn't make sense.

mayor2013:


BMW contacts Bosch during production of most of their vehicles. Mecerdes Benz contacts Bosch as well during production of most of their vehicles that's why you see most parts come in Bosch. Toyota contacts denso, Aisin, Bose and many Innovative companies for production of some components.
This Is what you call an informal approach to learning. So you better sit down relax, hush your mouth and be attentive so as not to miss better ideological information ahead of you in the automobile repair industry

MotorGuru:


Wouldn't that be a case of a blocked exhaust( catalyst)?

GAZZUZZ:

radautoworks:


I follow you salute

mayor2013:


BMW contacts Bosch during production of most of their vehicles. Mecerdes Benz contacts Bosch as well during production of most of their vehicles that's why you see most parts come in Bosch. Toyota contacts denso, Aisin, Bose and many Innovative companies for production of some components.
This Is what you call an informal approach to learning. So you better sit down relax, hush your mouth and be attentive so as not to miss better ideological information ahead of you in the automobile repair industry

jarkbauer:
I didn't expect a car that's managed by gazzuzz to park up like this. If you were a kazeem I would argued that you deliberately damaged it so you can replace the engine. The oyinbo owner probably didn't maintain this well.

GAZZUZZ:
for the record this is purely educational, and engine replacement is already procured.

rationalmind:


I'm curious though, since the engine failed at around a hundred thousand miles, why replace with another of similar mileage especially as the failure could be inherent to the engine as suggested by a couple of posters.