4.2L QPV engine take-apart

[DoctorMesmer]

I thought some members might appreciate this video showing full disassembly of a 4.2L engine (from a QPV, I think):

One commenter says that the rogue screws and washers are a known failure point on the 4.2L /F136 engines and hold the plastic timing chain guide shoes (wear pads) to the metal tensioner arms.

 

[Lozzer]

I thought some members might appreciate this video showing full disassembly of a 4.2L engine (from a QPV, I think):

One commenter says that the rogue screws and washers are a known failure point on the 4.2L /F136 engines and hold the plastic timing chain guide shoes (wear pads) to the metal tensioner arms.

I may be wrong, but I've not heard of that one and I can't see self tappers being part of an engine assy either. Pretty poor if they are.

 

[DoctorMesmer]

I may be wrong, but I've not heard of that one and I can't see self tappers being part of an engine assy either. Pretty poor if they are.

Especially when the rest of the engine seems to be so well engineered and put together!

 

[smug1uk]

Excellent video, nice to see exactly what's inside. Sounds to me like a rogue workshop dropping those screws and washers into the engine hoping to get work from it.

 

[CatmanV2]

Been discussed at some length...

C

 

[strictly]

Been discussed at some length...

C

Where to? Did we get to the bottom of those screws. Are they really from the plastics timing chain guide screws...I read a few of the you tube comments but didn't read them all

Anyone got a picture of one so we can take a look?

I did take a mental note coolant changes and not to reuse the oil coolers.

Also looks to be fairly complex. I'm hoping not to take mine apart!

 

[CatmanV2]

It's on one of the other threads. Theories vary from the more cynical amongst us that suspect they may have been lobbed in for the video, to a scorned wife throwing them in the oil filler.

It all seems a little suss to me as the general view is that self tappers are never going to be used in an engine.

C

 

[strictly]

It's on one of the other threads. Theories vary from the more cynical amongst us that suspect they may have been lobbed in for the video, to a scorned wife throwing them in the oil filler.

It all seems a little suss to me as the general view is that self tappers are never going to be used in an engine.

C

Im in the chucked in the oil filler camp myself.

In my post above with a screenshot of the YouTube comment...the poster i think is referring to item #3 with part number 186184.

I couldn't find a full picture of that but i suppose it is not outside the realms of possibility that these are screwed on from the underside. See my attached picture.

Unfortunately without seeing one I can't figure it out.

I would be interested to get to real answer as if it is a genuine failure point I would like to know.

Edit!

the partnumber the you tube poster was referring to was 186184 and 1861865. I cannot see how 186185 would use any screws to attach the plastic...but I guess it's not impossible for 186184. We need someone to have a look at one...

 

[philw696]

There's no screws on the chain tensioner guide as the plastic is bonded on to the metal.

 

[CatmanV2]

There's no screws on the chain tensioner guide as the plastic is bonded on to the metal.

We need someone to have a look at one...

I suspect Phil's seen a few. But even so *self tappers*

C

 

[strictly]

There's no screws on the chain tensioner guide as the plastic is bonded on to the metal.

Ok there you go...so the you tube commentor who was talking about this being a common and failure point was talking pure bullstuff.

I thought i could smell it as I particularly like things backed up by material evidence.

One less thing to worry about!

Great video for seeing the inside of the long block it's better than pictures sometimes

 

[CatmanV2]

being a common and failure point was talking pure bullstuff.

Plus ca change. As I commented on one of the other threads social media sells interaction, not facts, and it seems that fewer people give a stuff about their facts when interaction is on the line

C

 

[DoctorMesmer]

Regardless of the screws, the commentary on the design choices and build quality of the engine seems overwhelmingly positive.

 

[Harvey_Tim]

It’s an interesting watch for sure, but as already stated there is no way those screws and washers have come from anything inside that engine !

 

[DoctorMesmer]

I agree that self tappers inside an engine would be very odd indeed.

 

[boomerang]

Sabotage?

 

[DoctorMesmer]

That was my first thought but then I read the comments and figured that, unbelievably, Maserati must have used self tappers inside the engine.

Now I don’t know what to believe - but remain skeptical that anyone would use self tappers in an engine.

It’s a great vid though, isn’t it?!

Q: Does giving up more than half an hour of my life to watch (and enjoy) the video make me a nerd?!

 

[Lozzer]

That was my first thought but then I read the comments and figured that, unbelievably, Maserati must have used self tappers inside the engine.

Now I don’t know what to believe - but remain skeptical that anyone would use self tappers in an engine.

It’s a great vid though, isn’t it?!

Q: Does giving up more than half an hour of my life to watch (and enjoy) the video make me a nerd?!

No, No, Yes and No

 

[DoctorMesmer]

 

[conaero]

Sabotage?

This all the aid of content