QP6 GTS engine rebuild

[Italiano]

Morning all, have been following this man's adventure,

It's an eye opener

 

[Erlingtheyounger]

Morning all, have been following this man's adventure,

It's an eye opener

Have been really enjoying this also.

 

[Louis2005qp]

I would love to watch him fix the engine.

 

[Italiano]

It's basically a Ferrari engine
So who sanctioned the cheaper con rods as I'm sure Ferrari wouldn't install inferior quality.
The oil drive is shocking, so it's a ticking time bomb on high mileage cars, surely if you have the engine out for what ever reason, you would want that area examined and replace the drive regardless, and it only manifested itself under hard loading so again many of us may have ticking time bombs under our ownership

 

[Zep]

It’s not unusual - many VAG engines had similar pump drive issues (at lower mileage). I fixed one of those myself.

Parts wear out and have a service life, if they were made to last for ever they would be more expensive (yes, even a Ferrari engine). 300k km doesn’t seem too shabby really.

What would be better is if manufacturers were to give the lifecycle details of their components, but they won’t, because people would consider it a warranty.

 

[Italiano]

It’s not unusual - many VAG engines had similar pump drive issues (at lower mileage). I fixed one of those myself.

Parts wear out and have a service life, if they were made to last for ever they would be more expensive (yes, even a Ferrari engine). 300k km doesn’t seem too shabby really.

What would be better is if manufacturers were to give the lifecycle details of their components, but they won’t, because people would consider it a warranty.

Considering the location of that drive and access to it, I would of preferred a better design or a drive that could exceed the life of engine. A very small but important part that in itself will scrap the engine

 

[Zep]

With much respect to M535, he did start at the wrong end, trying to remove the drive. I expect that by removing the pulley you can access it much more easily (it looks like these is a threaded hole for extraction).

That you would prefer a different design is not in doubt, but would you be willing to pay for it? This is the cost / benefit equation that faces all manufacturers. Ask me how I know.

 

[Italiano]

With much respect to M535, he did start at the wrong end, trying to remove the drive. I expect that by removing the pulley you can access it much more easily (it looks like these is a threaded hole for extraction).

That you would prefer a different design is not in doubt, but would you be willing to pay for it? This is the cost / benefit equation that faces all manufacturers. Ask me how I know.

I won't ask as I sense a trap, and I suspect you know lots lol.
But we already pay a high price even OTT for our babies, so it would not be unreasonable to have quality parts fitted, but hey ho

Is a throw away society but I will admit, I would not have the cash for big engine repair nor the justification. And I'm really attached to my baby

 

[philw696]

Oh Dear just watched this and it's obvious that Stellantis has not been good for Maserati.
Makes you appreciate what works of art the 4.2 dry sump engines really are in my opinion.

 

[Zep]

Oh Dear just watched this and it's obvious that Stellantis has not been good for Maserati.
Makes you appreciate what works of art the 4.2 dry sump engines really are in my opinion.

You had one which had a failed oil pump shaft too. So what’s the difference?

 

[Louis2005qp]

I think Maserati while under Ferrari ownership is not the same under Stellantis,
Maserati today is more mass-produced and there fore using less quality parts,
I also think putting the Variators and timing chains at the back of the engine is a bad from a service point of view. IMO

 

[philw696]

You had one which had a failed oil pump shaft too. So what’s the difference?

Certainly did and repaired it.
That was caused by the water pump leaking and rotting the splines on the shaft though.
It was a mess when I stripped it and it didn't damage the bottom end Zep.

 

[CatmanV2]

Certainly did and repaired it.
That was caused by the water pump leaking and rotting the splines on the shaft though.
It was a mess when I stripped it and it didn't damage the bottom end Zep.

Mostly because it was caught in time, no?

C

 

[philw696]

Mostly because it was caught in time, no?

C

Debatable the car had already been looked at by a Specialist in Kent who had condemned it.
I stripped it to find out and was able to repair it getting technical information from Autoshield as 10 years ago the information was not easy to find then.

 

[Zep]

Debatable the car had already been looked at by a Specialist in Kent who had condemned it.
I stripped it to find out and was able to repair it getting technical information from Autoshield as 10 years ago the information was not easy to find then.

If it had run under load without oil in it, that would have eaten the bottom end. There is no debate in that.

There is no engineering reason why one engine is better than another at surviving no oil pressure, it’s engine speed and load when it failed, how it is treated when it is low and mainly sheer luck. But you know that.

 

[philw696]

Totally agree Zep if this guy in question had stopped the car and removed the engine to investigate it could have been saved.
Not saying what he did was wrong as that's a diagnostic practice.
If it was a customers car it would be a headache for sure.

 

[CatmanV2]

I've not got to the end, yet, but so far it looks like the wear on the drive shaft was not the root cause. His statement that the pump only rotates one way and once it bites it's going to spin was exactly what I was thinking.

I assume there's more to come.

Also, 180,000 miles... Didn't look like a load of wear in the rest of the engine, and having to replace a component like that after that mileage doesn't really seem that bad (despite the obvious nightmare to get to it!)

From memory the 4200 oil pump replacement is also an engine out job (but not so covered in stuff!)

No spoilers, please

C

 

[philw696]

You can do the 4200 pump Insitu once you have lifted the engine a bit.
Certainly lots to shift on a modern engine that's for sure.

 

[CatmanV2]

You can do the 4200 pump Insitu once you have lifted the engine a bit.
Certainly lots to shift on a modern engine that's for sure.

Yeah, seen it now. I'd love a Trofeo Ghibli, but that engine design is *scary*. OTOH if they get to 180k + I should probably not worry too much.

From what I took away:
Most of the engine was actually in pretty good / good / excellent nick.
He was unlucky
The root cause of the issue is unknown.
The oil pump was going to fail at some point <guess> over next <100k miles
Those engines are designed to be built, not maintained!

C

 

[philw696]

Yeah, seen it now. I'd love a Trofeo Ghibli, but that engine design is *scary*. OTOH if they get to 180k + I should probably not worry too much.

From what I took away:
Most of the engine was actually in pretty good / good / excellent nick.
He was unlucky
The root cause of the issue is unknown.
The oil pump was going to fail at some point <guess> over next <100k miles
Those engines are designed to be built, not maintained!

C

He has already had the engine out once and done timing chains and turbos.
Most important thing I got from him is don't remap these engines.